Responses of East Asian Climate to SST Anomalies in the Kuroshio Extension Region during Boreal Autumn

Sea surface temperature anomalies (SSTAs) in the Kuroshio Extension (KE) region play a key role in influencing midlatitude climate variations. This study investigates the impacts of SSTAs in the KE region (KE-SSTA) on East Asian climate during boreal autumn. The results reveal that positive KE-SSTA,...

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Vydané v:Journal of climate Ročník 35; číslo 21; s. 7007 - 7023
Hlavní autori: Geng, Yu, Ren, Hong-Li, Ma, Xueying, Zhao, Shuo, Nie, Yu
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Boston American Meteorological Society 01.11.2022
Predmet:
Adiabatic
Adiabatic heating
Advection
Agricultural production
Anomalies
Anticyclonic circulation
Atmospheric boundary layer
Atmospheric circulation
Autumn
Autumn climates
Baroclinic mode
Baroclinity
Barotropic mode
Boundary conditions
Circulation anomalies
Climate
Climate prediction
Climate variations
Convergence and divergence
Divergence
Drought
Heat
Latitude
Lower troposphere
Numerical experiments
Precipitation
Rain
Sea surface
Sea surface temperature
Sea surface temperature anomalies
Surface temperature
Temperature anomalies
Temperature gradients
Thermal winds
Troposphere
Variation
Vortices
Water shortages
Water vapor
Water vapour
East Asia
Pacific Ocean
ISSN:0894-8755, 1520-0442
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Popis
Shrnutí:Sea surface temperature anomalies (SSTAs) in the Kuroshio Extension (KE) region play a key role in influencing midlatitude climate variations. This study investigates the impacts of SSTAs in the KE region (KE-SSTA) on East Asian climate during boreal autumn. The results reveal that positive KE-SSTA, changing the meridional temperature gradient in the lower troposphere, contributes to the formation of an anomalous quasi-barotropic anticyclonic circulation (AC) over the KE region. Such a configuration tends to be affected by wind through thermal wind adjustment. Simultaneously, it is also impacted by eddy activity related to the strengthened atmospheric baroclinicity through transient eddy feedback. By both means, obvious descending motion and warm advection are generated, which increases tropospheric temperature through adiabatic heating and further maintains the abnormal AC over the KE region. This anomalous circulation changes wind in the east of the East Asian trough, which favors the transportation of warm and wet air from the midlatitude northwest Pacific and further causes the increase of temperature in northeastern East Asia. Moreover, it also leads to the convergence and divergence of water vapor fluxes in Northeast Asia and eastern North China, favoring the increase and decrease of precipitation in the two regions, respectively. The above responsive characteristics of the midlatitude atmospheric circulation to positive KE-SSTA can be confirmed by numerical experiments. These results suggest that anomalous SST in the KE region can be used as a potentially effective predictability source for autumn climate variations in the midto high latitudes of East Asia.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0894-8755
1520-0442
DOI:10.1175/jcli-d-21-0711.1