Abstract
The Choco low-level jet is among the main regional circulation mechanisms related to the advection of water vapor from the eastern Pacific to northwestern South America. Variations in the intensity of position of the jet core are identified as determinant for regional moisture transport and associated rainfall. This paper analyzes the annual cycle of intensity and latitudinal location of this jet according to different reanalysis and observational datasets. Moreover, we compare possible changes in the Choco jet occurred during past climates, like the little ice age (LIA), with those associated with future scenarios of greenhouse gas concentrations (RCP8.5), using simulations from the Paleoclimate Modelling Intercomparison Project Phase 3 (PMIP3) and the Coupled Model Intercomparison Project Phase 5 (CMIP5). Our results suggest that according to reanalysis/observational data, as well as the CMIP5 models with the best representation of the Choco jet in present climate, there is a positive correlation between the jet intensity and its latitudinal location, and such relationship is associated with the sea level pressure (SLP) difference between the eastern tropical Pacific and the northwestern South American landmass. Hence, stronger (weaker) SLP differences favor a stronger (weaker) intensity and a northward (southward) location of the Choco jet. PMIP3 simulations suggest a stronger and northward Choco jet during LIA due to a stronger SLP difference in comparison to present climate. However, under the RCP8.5 scenario, there is not robust agreement among CMIP5 models although the best models suggest a southward jet at the end of the 21st century. This suggests that the mechanisms influencing the Choco jet may play different roles during past natural climate changes with respect to anthropogenically-forced climate changes.
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Funding
This research has been funded by “Departamento Administrativo de Ciencia, Tecnología e Innovación de Colombia” Program #5509-543-31966 and by MINCIENCIAS through the Grant 80740-490-220. J.P. Sierra was partially supported by the AMANECER (Amazon-Andes Connectivity) Project - Make Our Planet Great Again Program, funded by ANR and IRD (ref. ANR-18-MPGA-0008). A.M Durán-Quesada acknowledges support from the B8766 project.
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Supplementary file1Fig. S1 Inconsistency between observational/reanalysis datasets (left) and CMIP5 mean absolute error (right) of the 925 hPa zonal wind for DJF (top) and SON (bottom).Fig S2. Monthly anomalies of the Choco jet intensity (black; left axis; in m/s) and its latitudinal location (red; right axis; in degrees of latitude) during the period 1979–2005, simulated by the 7 best CMIP5 models identified by Sierra et al. (2018).Fig. S3 Composites of SLP difference anomalies for (a) Niño-Land, (b) Ocean-Land, and (c) Niño-Ocean during events when the Choco jet is weak and exhibits a northward location (N-W; blue), and strong and exhibits a southward location (S-S; red). Composites are shown for ERA-Interim (ERA-In), ERA5, CFSR, NCEP-DOE, QuickSCAT, CMIP5 ensemble (All GCMs), PMIP3 ensemble (PMIP), and Best models ensemble (Best).Fig. S4 Histograms of anomalies of: (a) Choco jet core intensity, (b) Choco jet latitudinal location, and (c) Niño-Land SLP difference during LIA (blue), present (red) and future (yellow) periods for the CMIP5 models with data available for the Last Millennium, Historical and RCP8.5 experiments (Table 1). LIA corresponds to the period identified by Rojas et al. (2016) (Table 2). Present corresponds to the period 1979–2005. Future corresponds to the period 2070–2100. (docx 6212 KB)
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Sierra, J.P., Arias, P.A., Durán-Quesada, A.M. et al. The Choco low‐level jet: past, present and future. Clim Dyn 56, 2667–2692 (2021). https://doi.org/10.1007/s00382-020-05611-w
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DOI: https://doi.org/10.1007/s00382-020-05611-w