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The Spatial and Temporal Distribution of Nighttime Ozone and Sulfur Dioxide in the Venus Mesosphere as Deduced from SPICAV UV Stellar Occultations J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-25 D. Evdokimova; D. Belyaev; F. Montmessin; O. Korablev; J.‐L. Bertaux; L. Verdier; F. Lefèvre; E. Marcq
The nighttime ozone and sulfur dioxide distributions were analyzed using the entire SPICAV‐UV/Venus Express stellar occultation dataset. After the discovery of an ozone layer at 100 km in the mesosphere reported by Montmessin et al. (2011), 132 other detections were made during the entire 8 years long observing period of the SPICAV UV instrument. In the rare detections the peak abundances of O3 accumulating
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Correction to: The role of transient eddies and diabatic heating in the maintenance of European heat waves: a nonlinear quasi-stationary wave perspective Clim. Dyn. (IF 4.486) Pub Date : 2021-02-25 Qiyun Ma, Christian L. E. Franzke
A correction to this paper has been published: https://doi.org/10.1007/s00382-021-05704-0
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On the uncertainty of future projections of Marine Heatwave events in the North Atlantic Ocean Clim. Dyn. (IF 4.486) Pub Date : 2021-02-25 Sandra M. Plecha, Pedro M. M. Soares, Susana M. Silva-Fernandes, William Cabos
Marine Heatwave (MHW) events have been increasing all around the world, causing severe impacts on marine ecosystems and on the economy of the aquaculture, fishing and tourism industries. In this study, the occurrence and characteristics of MHW events in the North Atlantic are analyzed for a recent period (1971–2000) and the two future periods (2041–2070 and 2071–2100). The analysis is based on Sea
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North Atlantic multidecadal footprint of the recent winter warm Arctic–cold Siberia pattern Clim. Dyn. (IF 4.486) Pub Date : 2021-02-24 Yanan Chen, Dehai Luo, Linhao Zhong
The multidecadal regulation of wintertime extreme cold temperatures over Eurasia by the change of the North Atlantic sea surface temperature (SST) from 1950–1983 (P1) to 1984–2017 (P2) is examined in this paper. The warm Arctic–cold Siberia (WACS) trend pattern shows a distinct interdecadal transition from P1 to P2, which has a footprint of the Atlantic Multidecadal Oscillation (AMO). The positive
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Physical and Chemical Evolution of Lunar Mare Regolith J. Geophys. Res. Planets (IF 3.713) Pub Date : 2020-12-16 P. O'Brien; S. Byrne
The lunar landscape evolves both physically and chemically over time due to impact cratering and energetic processes collectively known as space weathering. Despite returned soil samples and global remote sensing reflectance measurements, the rate of space weathering in the lunar regolith is not well understood. To address this, we developed a novel three‐dimensional landscape evolution model to simulate
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Vertically Resolved Magma Ocean–Protoatmosphere Evolution: H2, H2O, CO2, CH4, CO, O2, and N2 as Primary Absorbers J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-17 Tim Lichtenberg; Dan J. Bower; Mark Hammond; Ryan Boukrouche; Patrick Sanan; Shang‐Min Tsai; Raymond T. Pierrehumbert
The earliest atmospheres of rocky planets originate from extensive volatile release during magma ocean epochs that occur during assembly of the planet. These establish the initial distribution of the major volatile elements between different chemical reservoirs that subsequently evolve via geological cycles. Current theoretical techniques are limited in exploring the anticipated range of compositional
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Geologic and Thermal Characterization of Oxia Planum Using Mars Odyssey THEMIS Data J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-15 C. E. Gary‐Bicas; A. D. Rogers
Oxia Planum will be the landing site for the European Space Agency ExoMars 2022 “Rosalind Franklin” mission to conduct astrobiological and geological experiments investigating the region's past. Previous orbital short‐wave infrared (SWIR, 1.0–2.6 μm) spectroscopic studies reported widespread phyllosilicate detections in the region suggesting possible alteration of its original lithology by past aqueous
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High‐Frequency Seismic Events on Mars Observed by InSight J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-05 Martin van Driel; Savas Ceylan; John F. Clinton; Domenico Giardini; Anna Horleston; Ludovic Margerin; Simon C. Stähler; Maren Böse; Constantinos Charalambous; Taichi Kawamura; Amir Khan; Guenolé Orhand‐Mainsant; John‐R. Scholz; Fabian Euchner; Martin Knapmeyer; Nicholas Schmerr; William T. Pike; Philippe Lognonné; William B. Banerdt
The seismometer deployed on the surface of Mars as part of the InSight mission (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) has recorded several hundreds of marsquakes in the first 478 sols after landing. The majority of these are classified as high‐frequency (HF) events in the frequency range from approximately 1 to 10 Hz on Mars' surface. All the HF events excite
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Small Volcanic Vents of the Tharsis Volcanic Province, Mars J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-03 J. A. Richardson; J. E. Bleacher; C. B. Connor; L. S. Glaze
Distributed‐style volcanism is an end member of terrestrial volcanism that produces clusters of small volcanoes when isolated magma bodies ascend from broad magma source regions. Volcano clusters can develop over millions of years, one volcano at a time, and can be used to infer unobserved geologic phenomena, including subsurface stresses and cracks during eruption periods. The Tharsis Volcanic Province
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An Evolving Understanding of Enigmatic Large Ripples on Mars J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-14 Mathieu G. A. Lapôtre; Ryan C. Ewing; Michael P. Lamb
Two scales of ripples form in fine sand on Mars. The larger ripples were proposed to have an equilibrium size set by an aerodynamic process, making them larger under thinner atmospheres and distinct from smaller impact ripples. Sullivan et al. (2020, https://doi.org/10.1029/2020JE006485) show that large ripples can develop in a numerical model due to Mars’ low atmospheric pressure. Although their proposed
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A New Large‐Scale Map of the Lunar Crustal Magnetic Field and Its Interpretation J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-01 Lon L. Hood; Cecilyn B. Torres; Joana S. Oliveira; Mark A. Wieczorek; Sarah T. Stewart
A new large‐scale map of the lunar crustal magnetic field at 30 km altitude covering latitudes from 65°S to 65°N has been produced using high‐quality vector magnetometer data from two complementary polar orbital missions, Lunar Prospector and SELENE (Kaguya). The map has characteristics similar to those of previous maps but better resolves the shapes and distribution of weaker anomalies. The strongest
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Magnetic Anomalies in Five Lunar Impact Basins: Implications for Impactor Trajectories and Inverse Modeling J. Geophys. Res. Planets (IF 3.713) Pub Date : 2020-12-31 L. L. Hood; J. S. Oliveira; J. Andrews‐Hanna; M. A. Wieczorek; S. T. Stewart
A recent large‐scale map of the lunar crustal magnetic field is examined for the existence of magnetic anomalies internal to ringed impact basins. It is found that, of 25 basins with upper preNectarian and younger ages, 18 contain mapped internal anomalies with amplitudes of at least 1 nT at 30 km altitude. Of these, five are most confidently judged to contain intrinsic anomalies (i.e., anomalies located
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Seasonal and Geographical Variability of the Martian Ionosphere From Mars Express Observations J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-02 F. González‐Galindo; D. Eusebio; F. Němec; K. Peter; A. Kopf; S. Tellmann; M. Paetzold
We study the seasonal and geographical variability of the peak electron density and the altitude of the main ionospheric peak at Mars. For this purpose, we use the data obtained by the ESA Mars Express mission, namely by the radar MARSIS and the radio occultation experiment MaRS. The accumulation of data during the long lifetime of Mars Express provides for the first time an almost complete seasonal
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Turbulent Shear Flow Over Large Martian Ripples J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-21 Hezi Yizhaq; Arik Siminovich; Itzhak Katra; Avi Levy; Robert Sullivan; Simone Silverstro; Alexander Yakhot
On Mars, large aeolian ripples with wavelengths typically 1–3 m but lacking very coarse sand at crests have been encountered by rovers and observed from orbit. These bedforms have no terrestrial counterpart and several hypotheses for origins have been proposed. This work reports results of Computational Fluid Dynamics (CFD) experiments with ANSYS Fluent under terrestrial and Martian boundary layer
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Seasonal and Spatial Variability of Carbon Monoxide (CO) in the Martian Atmosphere From PFS/MEX Observations J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-08 Jimmy Bouche; Pierre‐François Coheur; Marco Giuranna; Paulina Wolkenberg; Luca Nardi; Marilena Amoroso; Ann Carine Vandaele; Frank Daerden; Lori Neary; Sophie Bauduin
A subset of more than 100,000 nadir measurements covering more than 7 Martian years (MY 26–MY 33) recorded in the thermal part of the Short Wavelength Channel (SWC) from the Planetary Fourier Spectrometer (PFS) on board Mars Express is exploited to investigate the global distribution and the seasonal cycle of carbon monoxide (CO) on Mars. The retrieval of CO vertical profiles is successfully achieved
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The Fundamental Connections between the Solar System and Exoplanetary Science J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-01 Stephen R. Kane; Giada N. Arney; Paul K. Byrne; Paul A. Dalba; Steven J. Desch; Jonti Horner; Noam R. Izenberg; Kathleen E. Mandt; Victoria S. Meadows; Lynnae C. Quick
Over the past several decades, thousands of planets have been discovered outside our Solar System. These planets exhibit enormous diversity, and their large numbers provide a statistical opportunity to place our Solar System within the broader context of planetary structure, atmospheres, architectures, formation, and evolution. Meanwhile, the field of exoplanetary science is rapidly forging onward
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Species‐dependent Response of the Martian Ionosphere to the 2018 Global Dust Event J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-22 D.‐D. Niu; J. Cui; S.‐Q. Wu; H. Gu; Y.‐T. Cao; Z.‐P. Wu; X.‐S. Wu; J.‐H. Zhong; M.‐Y. Wu; Y. Wei; T.‐L. Zhang
Global dust storms (GDS) are an important dynamical phenomenon of the Martian lower atmosphere but are known to have important impacts on the Martian middle/upper atmosphere and ionosphere. Despite extensive studies over the past several decades, how the composition of the Martian ionosphere is modified during the GDS has only been studied from a theoretical point of view. Here we present for the first
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Ensemble projection of city-level temperature extremes with stepwise cluster analysis Clim. Dyn. (IF 4.486) Pub Date : 2021-02-24 Chen Lu, Guohe Huang, Xiuquan Wang, Lirong Liu
Climate change can cause property damage and deaths in cities. City-scale climate projections are essential for making informed decisions towards climate change mitigation and adaptation at city levels. This study aims at developing ensemble projections of temperature extremes at the city-level and quantifying the contributions of various factors to the resulting uncertainty of the ensemble projections
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The sea level variability and its projections over the Indo‐Pacific Ocean in CMIP5 models Clim. Dyn. (IF 4.486) Pub Date : 2021-02-23 J. S. Deepa, C. Gnanaseelan, Anant Parekh
The present study examines the representation of interannual and decadal variability of sea level over the Indo-Pacific region in the Coupled Model Intercomparison Project Phase 5 (CMIP5) historical simulations and future projections. The thermocline ridge region of the Indian Ocean (TRIO) shows strong sea level variability on both the interannual and decadal timescales in the CMIP5 historical simulations
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Aerosols in Exoplanet Atmospheres J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-23 Peter Gao; Hannah R. Wakeford; Sarah E. Moran; Vivien Parmentier
Observations of exoplanet atmospheres have shown that aerosols, like in the Solar System, are common across a variety of temperatures and planet types. The formation and distribution of these aerosols are inextricably intertwined with the composition and thermal structure of the atmosphere. At the same time, these aerosols also interfere with our probes of atmospheric composition and thermal structure
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Understanding the variability of the rainfall dipole in West Africa using the EC-Earth last millennium simulation Clim. Dyn. (IF 4.486) Pub Date : 2021-02-23 Qiong Zhang, Ellen Berntell, Qiang Li, Fredrik Charpentier Ljungqvist
There is a well-known mode of rainfall variability associating opposite hydrological conditions over the Sahel region and the Gulf of Guinea, forming a dipole pattern. Previous meteorological observations show that the dipole pattern varies at interannual timescales. Using an EC-Earth climate model simulation for last millennium (850–1850 CE), we investigate the rainfall variability in West Africa
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Projection of upwelling-favorable winds in the Peruvian upwelling system under the RCP8.5 scenario using a high-resolution regional model Clim. Dyn. (IF 4.486) Pub Date : 2021-02-22 Adolfo Chamorro, Vincent Echevin, Cyril Dutheil, Jorge Tam, Dimitri Gutiérrez, François Colas
The Peruvian upwelling system (PUS) is the most productive Eastern Boundary Upwelling System (EBUS) of the world ocean. Contrarily to higher latitude EBUSs, there is no consensus yet on the response of upwelling-favorable winds to regional climate change in this region. Global climate models are not able to reproduce the nearshore surface winds, and only a few downscaling studies have been performed
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Yearly evolution of Euro-Atlantic weather regimes and of their sub-seasonal predictability Clim. Dyn. (IF 4.486) Pub Date : 2021-02-22 Nicola Cortesi, Verónica Torralba, Llorenó Lledó, Andrea Manrique-Suñén, Nube Gonzalez-Reviriego, Albert Soret, Francisco J. Doblas-Reyes
It is often assumed that weather regimes adequately characterize atmospheric circulation variability. However, regime classifications spanning many months and with a low number of regimes may not satisfy this assumption. The first aim of this study is to test such hypothesis for the Euro-Atlantic region. The second one is to extend the assessment of sub-seasonal forecast skill in predicting the frequencies
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Geologically old but freshly exposed rock fragments encountered by Yutu‐2 rover J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-22 Sheng GOU; Zongyu YUE; Kaichang DI; Roberto BUGIOLACCHI; Wenhui WAN; Meiping YANG; Lejia YE
During the exploration traverse of the Von Kármán crater on the lunar farside, the Yutu‐2 rover, part of China's Chang'e‐4 mission, come across rock fragments with higher albedo than the surrounding surface. This study investigates their origin, emplacement, and composition based on in situ spectral analysis and geological considerations. The spectral signatures of two fragments show a clear dominance
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Impact of middle east dust on subseasonal-to-seasonal variability of the Asian summer monsoon Clim. Dyn. (IF 4.486) Pub Date : 2021-02-22 Meirong Wang, William K. M. Lau, Jun Wang
We investigated the effect of increased spring (April–May) dust aerosol over the Arabian Peninsula (AP) on the subseasonal-to-seasonal (S2S) variability of the Asian summer monsoon (ASM) using MERRA-2 re-analysis data (1980–2018). Result shows that abundant AP spring dust leads to more dust covering the AP and Pakistan northwestern India (PNWI) during May–June, causing a cooler land surface and a warmer
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The modulation of Indian summer monsoon onset processes during ENSO through equatorward migration of the subtropical jet stream Clim. Dyn. (IF 4.486) Pub Date : 2021-02-22 Devanil Choudhury, Debashis Nath, Wen Chen
In this study, we demonstrate a new mechanism, on how the warm phase of El Niño and Southern Oscillation (ENSO) delays the Indian Summer Monsoon onset through coupled ocean-atmospheric processes. Strong basin-wide warming is prominent over North Indian Ocean (NIO) during the El Niño years. The warming is intense over the South West Indian Ocean (SWIO) due to the westward propagation of the equatorial
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Hydroclimatic trends during 1950–2018 over global land Clim. Dyn. (IF 4.486) Pub Date : 2021-02-21 Aiguo Dai
Global hydroclimatic changes from 1950 to 2018 are analyzed using updated data of land precipitation, streamflow, and an improved form of the Palmer Drought Severity Index. The historical changes are then compared with climate model-simulated response to external forcing to determine how much of the recent change is forced response. It is found that precipitation has increased from 1950 to 2018 over
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Measuring Ripple and Dune Migration in Coprates Chasma, Valles Marineris: A Source to Sink Aeolian System on Mars? J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-20 S. J. Boazman; J.M. Davis; P. M. Grindrod; M. R. Balme; P.Vermeesch; T. Baird
Active aeolian systems are present across the martian surface, with active dune fields commonly found in depressions such as craters and valleys. There are many dune fields within the equatorial region of Mars, including Valles Marineris, but the effects of topography on wind regimes and consequently dune migration in Valles Marineris is poorly understood. We investigated both the ripple and dune migration
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Clustering circulation in eastern Asia as a tool for exploring possible mechanisms of extreme events and sources of model error Clim. Dyn. (IF 4.486) Pub Date : 2021-02-21 Robin T. Clark, Lixia Zhang, Chaofan Li
Every summer in eastern Asia, the combined effects of complex topography, multiple potential moisture sources and a mixture of sub-tropical and mid-latitude dynamics produces an environment, in which subtle differences in spatial patterns of atmospheric circulation can profoundly affect the geographic distribution of rainfall. Understanding and quantifying these patterns is a fundamental requirement
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Tropical forcing of Australian extreme low minimum temperatures in September 2019 Clim. Dyn. (IF 4.486) Pub Date : 2021-02-20 Eun-Pa Lim, Harry H. Hendon, Li Shi, Catherine de Burgh-Day, Debra Hudson, Andrew King, Blair Trewin, Morwenna Griffiths, Andrew Marshall
We explore the causes and predictability of extreme low minimum temperatures (Tmin) that occurred across northern and eastern Australia in September 2019. Historically, reduced Tmin is related to the occurrence of a positive Indian Ocean Dipole (IOD) and central Pacific El Niño. Positive IOD events tend to locate an anomalous anticyclone over the Great Australian Bight, therefore inducing cold advection
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Characterizing Dust‐Radiation Feedback and Refining the Horizontal Resolution of the MarsWRF Model down to 0.5 Degree J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-19 C. Gebhardt; A. Abuelgasim; R. M. Fonseca; J. Martín‐Torres; M.‐P. Zorzano
In this study, three simulations by the Mars Weather Research and Forecasting (MarsWRF) model are compared: two 10 Martian Year (MY) 2° × 2° simulations with (i) fully radiatively‐active dust and (ii) a prescribed dust scenario, and a (iii) 1 MY 0.5° × 0.5° simulation with prescribed dust as in (ii). From comparing (i) and (ii), we found that the impact of dust‐radiation feedback is individually different
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Source‐to‐Sink Terrestrial Analogs for the Paleoenvironment of Gale Crater, Mars J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-18 Michael T. Thorpe; Joel A. Hurowitz; Kirsten L. Siebach
In the Late Noachian to Early Hesperian period, rivers transported detritus from igneous source terrains to a downstream lake within Gale crater, creating a stratified stack of fluviolacustrine rocks that is currently exposed along the slopes of Mount Sharp. Controversy exists regarding the paleoclimate that supported overland flow of liquid water at Gale crater, in large part because little is known
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Lightning Generation in Moist Convective Clouds and Constraints on the Water Abundance in Jupiter J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-17 Yury S. Aglyamov; Jonathan Lunine; Heidi N. Becker; Tristan Guillot; Seran G. Gibbard; Sushil Atreya; Scott J. Bolton; Steven Levin; Shannon T. Brown; Michael H. Wong
Recent Juno observations have greatly extended the temporal and spatial coverage of lightning detection on Jupiter. We use these data to constrain a model of moist convection and lightning generation in Jupiter's atmosphere, and derive a roughly solar abundance of water at the base of the water cloud. Shallow lightning, observed by Juno (Becker et al., 2020, https://doi.org/10.1038/s41586‐020‐2532‐1
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Heat Flux Constraints From Variance Spectra of Pluto and Charon Using Limb Profile Topography J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-11 J. W. Conrad; F. Nimmo; R. A. Beyer; C. J. Bierson; P. M. Schenk
We derive a topography data set from images of Pluto and Charon that contain the body edge (i.e., limb profiles) which will help in understanding the comparative history of the binary system. We use the profiles to derive topographic variance spectra and find that while the variance spectrum of Pluto fits a single power law, Charon's spectrum displays a clear breakpoint at ∼150 km wavelength. Assuming
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The Influence of a Fluid Core and a Solid Inner Core on the Cassini State of Mercury J. Geophys. Res. Planets (IF 3.713) Pub Date : 2020-12-25 Mathieu Dumberry
We present a model of the Cassini state of Mercury that comprises an inner core, a fluid core, and a mantle. Our model includes inertial and gravitational torques between interior regions, and viscous and electromagnetic (EM) coupling at the boundaries of the fluid core. We show that the coupling between Mercury's interior regions is sufficiently strong that the obliquity of the mantle spin axis deviates
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Investigating the Influences of Crustal Thickness and Temperature on the Uplift of Mantle Materials Beneath Large Impact Craters on the Moon J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-12 Min Ding; Jason M. Soderblom; Carver J. Bierson; Maria T. Zuber
In this work, we examine variations in the mantle uplift associated with large lunar impact craters and basins between major terranes. This study is based on Bouguer gravity anomalies of 100–650‐km diameter impact craters using Gravity Recovery and Interior Laboratory (GRAIL) observations and the Lunar Orbiter Laser Altimeter (LOLA) crater database. The Bouguer gravity anomalies of 324 large impact
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Unmixing Mineral Abundance and Mg# With Radiative Transfer Theory: Modeling and Applications J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-26 Lingzhi Sun; Paul G. Lucey
Mineral abundance and Mg# (100× molar Mg/(Mg + Fe)) are significant in understanding the crustal composition and thermal history of the Moon. In this study, we derive a new set of optical constants for olivine, orthopyroxene, and clinopyroxene using radiative transfer equations that include soil porosity and the opposition effect. Based on the new optical constants, we develop a mineral abundance and
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Spectral Characterization of Bennu Analogs Using PASCALE: A New Experimental Set‐Up for Simulating the Near‐Surface Conditions of Airless Bodies J. Geophys. Res. Planets (IF 3.713) Pub Date : 2020-12-15 K. L. Donaldson Hanna; N. E. Bowles; T. J. Warren; V. E. Hamilton; D. L. Schrader; T. J. McCoy; J. Temple; A. Clack; S. Calcutt; D. S. Lauretta
We describe the capabilities, radiometric stability, and calibration of a custom vacuum environment chamber capable of simulating the near‐surface conditions of airless bodies. Here we demonstrate the collection of spectral measurements of a suite of fine particulate asteroid analogs made using the Planetary Analogue Surface Chamber for Asteroid and Lunar Environments (PASCALE) under conditions like
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Experimental Investigation of Apollo 16 “Rusty Rock” Alteration by a Lunar Fumarolic Gas J. Geophys. Res. Planets (IF 3.713) Pub Date : 2020-12-13 C. J. Renggli; S. Klemme
The Apollo 16 sample 66095, named “Rusty Rock”, is enriched in volatile and moderately volatile elements. The impact melt breccia is characterized by abundant Fe‐rich sulfide and chloride alteration phases, including FeS, ZnS, and FeCl2. These phases have previously been interpreted to be the result of fumarolic alteration of the breccia. Here we present the results of two different experimental approaches
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Seismic Efficiency for Simple Crater Formation in the Martian Top Crust Analog J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-25 A. Rajšić; K. Miljković; G. S. Collins; K. Wünnemann; I. J. Daubar; N. Wójcicka; M. A. Wieczorek
The first seismometer operating on the surface of another planet was deployed by the NASA InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission to Mars. It gives us an opportunity to investigate the seismicity of Mars, including any seismic activity caused by small meteorite bombardment. Detectability of impact generated seismic signals is closely related to
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Constraining Martian Regolith and Vortex Parameters From Combined Seismic and Meteorological Measurements J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-02-03 N. Murdoch; A. Spiga; R. Lorenz; R. F. Garcia; C. Perrin; R. Widmer‐Schnidrig; S. Rodriguez; N. Compaire; N. H. Warner; D. Mimoun; D. Banfield; P. Lognonné; W. B. Banerdt
The InSight mission landed on Mars in November 2018 and has since observed multiple convective vortices with both the high performance barometer and the low‐noise seismometer SEIS that has unprecedented sensitivity. Here, we present a new method that uses the simultaneous pressure and seismic measurements of convective vortices to place constraints on the elastic properties of the Martian subsurface
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Rossby Number Dependence of Venus/Titan‐Type Superrotation and Its Related Intermittency J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-28 Yuma Tsunoda; Masaru Yamamoto; Masaaki Takahashi
Venus/Titan‐type superrotation driven by stratospheric heating and intermittency seen in the superrotation dynamics are investigated using an idealized general circulation model in a high Rossby number regime (Ro = 7.5 to 23 for the strongest zonal jet) where the superrotation is formed by the meridional circulation and equatorward eddy momentum flux. When the jet core has a Rossby number of ∼23 on
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Magnetic Induction Responses of Jupiter's Ocean Moons Including Effects From Adiabatic Convection J. Geophys. Res. Planets (IF 3.713) Pub Date : 2020-12-25 S. D. Vance; M. J. Styczinski; B. G. Bills; C. J. Cochrane; K. M. Soderlund; N. Gómez‐Pérez; C. Paty
Prior analyses of oceanic magnetic induction within Jupiter's large icy moons have assumed uniform electrical conductivity. However, the phase and amplitude responses of the induced fields will be influenced by the natural depth‐dependence of the electrical conductivity. Here, we examine the amplitudes and phase delays for magnetic diffusion in modeled oceans of Europa, Ganymede, and Callisto. For
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Effect of the air–sea coupled system change on the ENSO evolution from boreal spring Clim. Dyn. (IF 4.486) Pub Date : 2021-02-18 Xiang-Hui Fang, Fei Zheng
Realistic simulation and accurate prediction of El Niño-Southern Oscillation (ENSO) is still a challenge. One fundamental obstacle is the so-called spring predictability barrier (SPB), which features a low predictive skill of the ENSO with prediction across boreal spring. Our observational analysis shows that the leading empirical orthogonal function mode of the seasonal Niño3.4 index evolution (i
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On the Effect of Magnetospheric Shielding on the Lunar Hydrogen Cycle J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-13 O. J. Tucker; W. M. Farrell; A. R. Poppe
The global distribution of surficial hydroxyl on the Moon is hypothesized to be derived from the implantation of solar wind protons. As the Moon traverses the geomagnetic tail, it is generally shielded from the solar wind; therefore, the concentration of hydrogen is expected to decrease during full Moon. A Monte Carlo approach is used to model the diffusion of implanted hydrogen atoms in the regolith
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Constraining the Temporal Variability of Neutral Winds in Saturn's Low‐Latitude Ionosphere Using Magnetic Field Measurements J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-13 Omakshi Agiwal; H. Cao; S. W. H. Cowley; M. K. Dougherty; G. J . Hunt; I. Müller‐Wodarg; N. Achilleos
The Cassini spacecraft completed 22 orbits around Saturn known as the “Grand Finale” over a 5 months interval, during which time the spacecraft traversed the previously unexplored region between Saturn and its equatorial rings near periapsis. The magnetic field observations reveal the presence of temporally variable low‐latitude field‐aligned currents which are thought to be driven by velocity shears
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Experimental Simulation of Titan's Stratospheric Photochemistry: Benzene (C6H6) Ices J. Geophys. Res. Planets (IF 3.713) Pub Date : 2020-12-28 J. Mouzay; I. Couturier‐Tamburelli; N. Piétri; T. Chiavassa
We performed laboratory experiments to study the photochemical evolution induced by long‐UV irradiation of benzene ices in Titan's atmosphere. The aim of this study was to investigate whether photo‐processed benzene ices could lead to the formation of aerosols analogs to those observed in Titan's stratosphere. Prior to that, spectroscopic properties of amorphous and crystalline benzene ices were studied
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Precipitating Solar Wind Hydrogen at Mars: Improved Calculations of the Backscatter and Albedo With MAVEN Observations J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-02 Z. Girazian; J. Halekas
Outside the Martian bow shock, charge exchange between solar wind protons and exospheric hydrogen produces energetic neutral atoms (ENAs) that travel toward Mars at the solar wind velocity. The penetrating ENAs deposit most of their energy near 150 km, but a fraction of them undergo enough collisions to be scattered back to space, resulting in a hydrogen albedo. Some of the penetrating ENAs are converted
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Evidence of Exposed Dusty Water Ice within Martian Gullies J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-18 Aditya Rai Khuller; Philip Russel Christensen
Midlatitude slopes on Mars are mantled by deposits proposed to contain H2O ice and dust, overlaid by a desiccated lag. However, direct evidence of their volatile content is lacking. Here we present novel evidence of light‐toned materials within midlatitude gully alcoves eroded into these mantles. The appearance and Lambert albedo of these materials suggests that they are either dust or H2O ice. We
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Compositional Mapping of the Nili Patera Feldspathic Unit: Extent and Implications for Formation J. Geophys. Res. Planets (IF 3.713) Pub Date : 2021-01-20 Gabriel L. Eggers; James J. Wray; Josef Dufek
Decades of study of the igneous martian crust concluded that it was primarily basaltic, but a range of new investigations find evidence of evolved compositions. Foremost of these is a highly feldspathic unit within the Nili Patera caldera of Syrtis Major, the only detection with preserved volcanic context but which nonetheless remains ambiguous in exact composition and formation. We conduct compositional
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Correction to: Report of the International Astronomical Union Division I Working Group on Precession and the Ecliptic Celest. Mech. Dyn. Astr. (IF 1.613) Pub Date : 2021-02-18 J. L. Hilton, N. Capitaine, J. Chapront, J. M. Ferrandiz, A. Fienga, T. Fudushima, J. Getino, P. Mathews, J. -L. Simon, M. Soffel, J. Vondrak, P. Wallage, J. Williams
The second of Eq shows that the coefficient of fifth-order term for the general precession in longitude.
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Shannon entropy diffusion estimates: sensitivity on the parameters of the method Celest. Mech. Dyn. Astr. (IF 1.613) Pub Date : 2021-02-17 Pablo M. Cincotta, Claudia M. Giordano, Raphael Alves Silva, Cristián Beaugé
In the present effort, we revisit the Shannon entropy approach for the study of both the extent and the rate of diffusion in a given dynamical system. In particular, we provide a theoretical and numerical study of the dependence of the formulation on the parameters of the method. We succeed in deriving not only a diffusion coefficient, \(D_{S}\), but also an estimate of the macroscopical instability
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Evaluation of subseasonal impacts of the MJO/BSISO in the East Asian extended summer Clim. Dyn. (IF 4.486) Pub Date : 2021-02-18 Chueh-Hsin Chang, Nathaniel C. Johnson, Changhyun Yoo
The Madden–Julian Oscillation (MJO)/Boreal Summer Intraseasonal Oscillation (BSISO) has been considered an important climate mode of variability on subseasonal timescales for East Asian summer. However, it is unclear how well the MJO/BSISO indices would serve as guidance for subseasonal forecasts. Using a probabilistic forecast model determined through multiple linear regression (MLR) with MJO, ENSO
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Interdecadal weakening of the cross-equatorial flows over the Maritime Continent during the boreal summer in the mid-1990s: drivers and physical processes Clim. Dyn. (IF 4.486) Pub Date : 2021-02-18 Xiaoxuan Zhao, Buwen Dong, Riyu Lu
In this study, the cross-equatorial flows (CEF) on both high and low level (HCEF/LCEF) troposphere over the Maritime Continent (MC) in boreal summer are found to have experienced an interdecadal weakening in the mid-1990s based on both JRA55 and NCEP reanalyses. The outputs of 8 coupled models in CMIP6 are used to investigate drivers and the corresponding mechanisms. Model results show that the role
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The southeast asian monsoon: dynamically downscaled climate change projections and high resolution regional ocean modelling on the effects of the Tibetan Plateau Clim. Dyn. (IF 4.486) Pub Date : 2021-02-18 Yiling Huo, W. Richard Peltier
The Southeast Asian Monsoon (SEAM) is strongly affected by the complex topography and land–sea interface over Southeast Asia (SEA), which combine to make simulation of the SEAM technically challenging. To adequately assess the regional climate change signal, we have employed the Weather Research and Forecasting (WRF) Model to dynamically downscale a global climate change projection produced with the
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Temperature dataset of CMIP6 models over China: evaluation, trend and uncertainty Clim. Dyn. (IF 4.486) Pub Date : 2021-02-17 Qinglong You, Ziyi Cai, Fangying Wu, Zhihong Jiang, Nick Pepin, Samuel S. P. Shen
The information on the projected climate changes over China is of great importance for preparing the nation’s societal adaptiveness to the future natural ecosystem. This study reports the surface mean temperature changes during 2014–2100 over China and its four sub-regions (Northern China, Northwestern China, Southern China, and the Tibetan Plateau) by analyzing 20 models from the Coupled Model Intercomparison
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Recurrence of wintertime SST anomalies in the Bay of Bengal: characteristics and causes Clim. Dyn. (IF 4.486) Pub Date : 2021-02-17 Yun Qiu, Xinyu Lin, Chunsheng Jing
This study investigates the winter-to-winter recurrence (WWR) of sea surface temperature anomaly (SSTA) in the Bay of Bengal (BOB) and its causes. During 1948–2016, 36% years show WWRs, which occurred over the BOB north of 13° N. The WWR of net surface heat flux (Qnet), especially the latent heat flux (Qlat) associated with change of winter monsoon wind speed, is essential for all the SSTA WWR events
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Critical homoclinics in a restricted four-body problem: numerical continuation and center manifold computations Celest. Mech. Dyn. Astr. (IF 1.613) Pub Date : 2021-02-15 Wouter Hetebrij, J. D. Mireles James
The present work studies the robustness of certain basic homoclinic motions in an equilateral restricted four-body problem. The problem can be viewed as a two-parameter family of conservative autonomous vector fields. The main tools are numerical continuation techniques for homoclinic and periodic orbits, as well as formal series methods for computing normal forms and center stable/unstable manifold
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Periodic solutions of a generalized Sitnikov problem Celest. Mech. Dyn. Astr. (IF 1.613) Pub Date : 2021-02-15 Gastón Beltritti
In this paper, we study the problem of determining whether a global family of even periodic solutions of a generalized Sitnikov problem, which emerges from a circular generalized Sitnikov problem, continues for all values of eccentricity in [0, 1) or ends in the equilibrium.
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Decadal changes of East Asian jet streams and their relationship with the Mid-high Latitude Circulations Clim. Dyn. (IF 4.486) Pub Date : 2021-02-16 Jingnan Yin, Yaocun Zhang
This study investigates the concurrent location and intensity changes of the East Asian polar front jet (EAPJ) and subtropical jet (EASJ) on decadal time scale using NCEP/NCAR, ERA5 and JRA-55 reanalysis data, along with the relationship with the mid-high latitude circulation changes. Results show that EAPJ was intensified accompanied by the weakening of EASJ after 1985, and shifted equatorward in
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