DOI: 10.1175/JCLI-D-17-0554.1
Scopus记录号: 2-s2.0-85049724580
论文题名: Increased frequency of summer extreme heat waves over Texas Area Tied to the amplification of pacific zonal SST gradient
作者: Deng K. ; Ting M. ; Yang S. ; Tan Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 14 起始页码: 5629
结束页码: 5647
语种: 英语
英文关键词: ENSO
; Extreme events
; Rossby waves
; Seasonal variability
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Climatology
; Mechanical waves
; Wind effects
; Atmospheric general circulation models
; Downward solar radiation
; ENSO
; Extreme events
; Interannual variability
; Rossby wave
; Seasonal variability
; Surface air temperatures
; Oceanography
; air temperature
; boundary condition
; El Nino-Southern Oscillation
; extreme event
; heat wave
; Rossby wave
; sea surface temperature
; seasonal variation
; summer
; temperature gradient
; Pacific Ocean
; Pacific Ocean (Tropical)
; Texas
; United States
英文摘要: Summer extreme heat waves (EHWs) over the Texas area and their trend are investigated using observations and atmospheric general circulation model (AGCM) output. There is a positive linear trend in Texas EHW days for the period 1979-2015. While the interannual variability of the Texas EHWs is linked to ENSO conditions, the upward trend in Texas EHWs is found to be significantly associated with the tropical Pacific zonal SST gradient (PZSSTG). The amplification of PZSSTG leads to both enhanced convection in the western Pacific and suppressed convection in the central-eastern Pacific (i.e., La Niña-like pattern), both of which can induce anomalous anticyclones over the Texas area through two distinct planetary wave trains in the antecedent spring. As a result, anomalously sinking motions and divergent water vapor flux appear over the Texas area, which reduce precipitation and increase downward solar radiation, leading to dry and hot soil that favors the occurrence of Texas summer EHWs. In addition, all AGCMs using observed SSTs as boundary conditions were able to simulate the observed decreasing trend in Texas summer precipitation and the observed increasing trend in Texas summer surface air temperature. The observed relationships between winter PZSSTG and the following spring-summer Texas precipitation/temperature were also reproduced by these models, where the intensified PZSSTG tended to reduce the Texas precipitation while increasing the surface air temperature. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111478
Appears in Collections: 气候减缓与适应
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作者单位: School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China; Institute of Earth Climate and Environment System, Sun Yat-sen University, Guangzhou, China
Recommended Citation:
Deng K.,Ting M.,Yang S.,et al. Increased frequency of summer extreme heat waves over Texas Area Tied to the amplification of pacific zonal SST gradient[J]. Journal of Climate,2018-01-01,31(14)