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  • On ice supersaturation over the Arctic
    Meteorol. Z. (IF 2.072) Pub Date : 2020-08-04
    Klaus Gierens; Lena Wilhelm; Michael Sommer; Dan Weaver

    We study ice-supersaturation in the cold (< -38∘$<-38^{\circ}$C) arctic troposphere and lower stratosphere using high-resolution quality-controlled radiosonde data. On average, ice supersaturation occurs in about 40 % to 60 % of the profiles with frequency of occurrence increasing with geographic latitude. The frequencies of occurrence show (so far) no long-term trends. The seasonal cycles are not

  • On the temporal variability of widespread rain-on-snow floods
    Meteorol. Z. (IF 2.072) Pub Date : 2020-08-04
    Amelie Krug; Cristina Primo; Svenja Fischer; Andreas Schumann; Bodo Ahrens

    Floods which affect several macro-scale river basins simultaneously can cause devastating damage. Future flood-risk assessment depends significantly on the knowledge about the atmospheric conditions leading to floods and external climate drivers. Nonetheless, only a few studies have investigated widespread floods, their occurrence frequency, and their underlying hydro-meteorological processes. We extended

  • Classifying direct normal irradiance 1‑minute temporal variability from spatial characteristics of geostationary satellite-based cloud observations
    Meteorol. Z. (IF 2.072) Pub Date : 2020-08-04
    Marion Schroedter-Homscheidt; M. Kosmale; Y.‑M. Saint-Drenan

    Variability of solar surface irradiances in the 1‑minute range is of interest especially for solar energy applications. Eight variability classes were previously defined for the 1 min resolved direct normal irradiance (DNI) variability inside an hour. In this study spatial structural parameters derived fromsatellite-based cloud observations are used as classifiers in order to detect the associated

  • Investigating predictability of offshore winds using a mesoscale model driven by forecast and reanalysis data
    Meteorol. Z. (IF 2.072) Pub Date : 2020-08-04
    Sven-Erik Gryning; Rogier Floors

    The atmosphere is inherently unpredictable by deterministic Numerical Weather Prediction models at both small and large temporal and spatial scales with some intermediate regime where predictability has been demonstrated; this study deals with time scales only. The chaotic nature at the smaller time scales is predominantly caused by turbulence and at the large scales by non-linearity of the Navier-Stokes

  • UTCI climatology and its future change in Germany – an RCM ensemble approach
    Meteorol. Z. (IF 2.072) Pub Date : 2020-08-04
    Benedict Manuel Brecht; Gerd Schädler; Janus Willem Schipper

    In the present study, the quantity, duration and intensity of heat stress events in Germany as well as their future change and relation with weather types were investigated. A small ensemble of regional climate simulations with the regional climate model (RCM) COSMO-CLM driven by four general circulation models (GCMs) was used to calculate the Universal Thermal Climate Index (UTCI); the UTCI is a well-accepted

  • Convection Initiation over the Eastern Arabian Peninsula
    Meteorol. Z. (IF 2.072) Pub Date : 2020-04-07
    Oliver Branch; Andreas Behrendt; Zhecheng Gong; Thomas Schwitalla; Volker Wulfmeyer

    We investigated summer statistics of convection initiation (CI) events in the north-eastern part of the Arabian Peninsula, particular the Al Hajar Mountains of the United Arab Emirates (UAE) and Oman (54.5–59.5° E longitude) with thermal radiances from the first generation (MFG) sensor of Meteosat‑7 at 57° E in the years 2010 to 2016. Previously, local precipitation radar was used for identifying convective

  • REAL-Fog: A simple approach for calculating the fog in the atmosphere at ground level
    Meteorol. Z. (IF 2.072) Pub Date : 2020-04-07
    Philipp Körner; Dieter Kalaß; Rico Kronenberg; Christian Bernhofer

    We developed the “REAL-Fog” (R‑Estimated spatiAL Fog) tool to calculate the ground-level fog by means of liquid water content (lwc) at a temporal resolution of 1 hour. The tool is based on a distributed and mainly physical model and requires a digital elevation model (DEM) and hourly observations of temperature and humidity. The tool spatially interpolates the air temperature and derived vapour pressure

  • Simulated influence of air pollution and aerosols on summer precipitation over the Pearl River Delta region
    Meteorol. Z. (IF 2.072) Pub Date : 2020-04-07
    Jiangnan Li; Yaqin Yang; Fangzhou Li; Wenshi Lin

    A simulation study of precipitation processes in summer over the Pearl River Delta region was conducted using the Weather Research and Forecasting Model coupled to with Chemistry, WRF-Chem. We investigated the influence of air pollution and aerosols on the summertime heavy precipitation over the subtropical regions. The study showed the following results. (1) The control test can simulate the largescale

  • Physically based correction of systematic errors of Rotating Shadowband Irradiometers
    Meteorol. Z. (IF 2.072) Pub Date : 2020-04-07
    Anne Forstinger; Stefan Wilbert; Anton Driesse; Natalie Hanrieder; Roman Affolter; Sharad Kumar; Neeraj Goswami; Norbert Geuder; Frank Vignola; Luis Zarzalejo; Aron Habte

    Accurate measurements of direct normal, diffuse horizontal and global horizontal irradiance (DNI, DHI and GHI) are needed for meteorological studies and are essential for the solar resource assessment at potential solar power plant sites. Often, these potential sites are remote and hence require robust sensors that require minimal maintenance that are not affected strongly by soiling. Therefore, Rotating

  • The Research Unit VolImpact: Revisiting the volcanic impact on atmosphere and climate – preparations for the next big volcanic eruption
    Meteorol. Z. (IF 2.072) Pub Date : 2020-04-07
    Christian von Savigny; Claudia Timmreck; Stefan A. Buehler; John P. Burrows; Marco Giorgetta; Gabriele Hegerl; Akos Horvath; Gholam Ali Hoshyaripour; Corinna Hoose; Johannes Quaas; Elizaveta Malinina; Alexei Rozanov; Hauke Schmidt; Larry Thomason; Matthew Toohey; Bernhard Vogel

    This paper provides an overview of the scientific background and the research objectives of the Research Unit “VolImpact” (Revisiting the volcanic impact on atmosphere and climate – preparations for the next big volcanic eruption, FOR 2820). VolImpact was recently funded by the Deutsche Forschungsgemeinschaft (DFG) and started in spring 2019. The main goal of the research unit is to improve our understanding

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