Cutoff Lows over the Southeast Pacific off the Coast of the Atacama Desert under Present Day Conditions and in the Last Glacial Maximum

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Title:Main Title: Cutoff Lows over the Southeast Pacific off the Coast of the Atacama Desert under Present Day Conditions and in the Last Glacial Maximum
Description:Abstract: Cutoff lows (COLs) over the subtropical Southeast Pacific may have a distinct impact on the local climate in Northern Chile and in the Atacama Desert. They are associated with generally wetter conditions and also influence the thermally driven wind regimes. In this study, mid-tropospheric COLs in the specific region off the coast of the Atacama Desert north of 30°S are analysed for austral winter (April-September). For the recent past climate slightly more than four COLs per winter on average are detected in ERA-Interim reanalysis (1979-2015). From composite analysis we found that a split jet over the Eastern South Pacific is beneficial for the formation of COLs. Depending on the characteristics of the southern jet streak, wave breaking processes are involved, and the majority of the COL events is associated to anti-cyclonic wave breaking equator-wards. More COLs occur in the Last Glacial Maximum (LGM) compared to present day conditions in two models (MPI-ESM-P and CCSM4) of the Paleoclimate Modeling Intercomparison Project (3rd phase; PMIP3). In both models the processes being involved in the COL formation are depicted realistically. The increasing number of winter COLs coincides with a shift of upper-level zonal winds, which facilitates the formation of the split jet structure over the Eastern South Pacific: The non-uniform global cooling during the LGM due to polar amplification induce a decrease of the subtropical jet and a speed up of upper-level zonal winds in the mid-latitudes of the Southern Hemisphere, and these shifts are particularly strong in the South Pacific region west of South America.
Citation Advice:Reyers M, Shao Y., 2019. Cutofflows offthe coast of the Atacama Desert under present day conditionsand in the Last Glacial Maximum. Global and Planetary Change 181,102983. https://doi.org/10.1016/j.gloplacha.2019.102983
Responsible Party
Creators:Mark Reyers (Author), Yaping Shao (Author)
Publisher:Elsevier
Publication Year:2019
Topic
CRC1211 Topic:Climate
Related Subproject:A3
Subject:Keyword: Meteorology
Geogr. Information Topic:Climatology/Meteorology/Atmosphere
File Details
Filename:Reyers_and_Shao_cutoff_lows_Atacama.pdf
Data Type:Text - Article
File Size:6.7 MB
Date:Accepted: 27.06.2019
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Free
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:None
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Specific Information - Publication
Publication Status:Accepted
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Global and Planetary Change
Number of Pages:12 (1 - 12)
Metadata Details
Metadata Creator:Mark Reyers
Metadata Created:26.08.2019
Metadata Last Updated:26.08.2019
Subproject:A3
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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Dataset Downloads:11
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