Future changes in the Great Plains Low-Level Jet governed by seasonally dependent pattern changes in the North Atlantic Subtropical High

Zhou, Wenyu; Leung, Lai-Yung; Song, Fengfei; Lu, Jian

doi:10.1029/2020GL090356

Title: Future changes in the Great Plains Low-Level Jet governed by seasonally dependent pattern changes in the North Atlantic Subtropical High

Journal Article · Thu Dec 17 00:00:00 EST 2020 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2020GL090356· OSTI ID:1778788

Zhou, Wenyu ^[1];

^[1]; Song, Fengfei ^[1]; Lu, Jian ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

The southerly Great Plains low-level jet (GPLLJ) plays an important role in the Central US hydroclimate, but our understanding of its response to global warming remains elusive. Here we show that the GPLLJ will intensify and intrude deeper under warming in both spring and autumn but change marginally in summer. This response is governed by seasonally dependent pattern changes of the North-Atlantic subtropical high (NASH). In spring and autumn, with a substantial poleward shift in the North America westerly jet, the NASH expands poleward notably. The anomalous surface high poleward of the NASH enhances the southerly GPLLJ to its west. In summer, however, the poleward westerly-jet shift is weak and changes in the NASH manifest a westward extension, which only marginally affects the GPLLJ. Among models, the NASH expansion and GPLLJ enhancement are correlated with the poleward jet shift, highlighting its critical role in regulating the future NASH and GPLLJ changes.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1778788

Report Number(s):: PNNL-SA-156288

Journal Information:: Geophysical Research Letters, Vol. 48, Issue 4; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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