DOI: 10.1175/JCLI-D-17-0270.1
Scopus记录号: 2-s2.0-85047061715
论文题名: Impacts of the Atlantic multidecadal variability on North American summer climate and heat waves
作者: Ruprich-Robert Y. ; Delworth T. ; Msadek R. ; Castruccio F. ; Yeager S. ; Danabasoglu G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 9 起始页码: 3679
结束页码: 3700
语种: 英语
英文关键词: Atmosphere-ocean interaction
; Decadal variability
; Drought
; Extreme events
; Soil moisture
; Teleconnections
Scopus关键词: Atmospheric humidity
; Atmospheric thermodynamics
; Climate change
; Drought
; Oceanography
; Precipitation (meteorology)
; Soil moisture
; Surface waters
; Atmosphere-ocean interactions
; Atmospheric teleconnections
; Coupled global climate model
; Decadal variability
; Extreme events
; Multidecadal variability
; Precipitation deficits
; Teleconnections
; Climate models
; air-sea interaction
; Atlantic Multidecadal Oscillation
; atmosphere-ocean coupling
; climate modeling
; computer simulation
; decadal variation
; drought
; extreme event
; numerical model
; sea surface temperature
; soil moisture
; summer
; teleconnection
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (Tropical)
; Mexico [North America]
; United States
英文摘要: The impacts of the Atlantic multidecadal variability (AMV) on summertime North American climate are investigated using three coupled global climate models (CGCMs) in which North Atlantic sea surface temperatures (SSTs) are restored to observed AMV anomalies. Large ensemble simulations are performed to estimate how AMV can modulate the occurrence of extreme weather such as heat waves. It is shown that, in response to an AMV warming, all models simulate a precipitation deficit and a warming over northern Mexico and the southern United States that lead to an increased number of heat wave days by about 30% compared to an AMV cooling. The physical mechanisms associated with these impacts are discussed. The positive tropical Atlantic SST anomalies associated with the warm AMV drive a Matsuno-Gill-like atmospheric response that favors subsidence over northern Mexico and the southern United States. This leads to a warming of the whole tropospheric column, and to a decrease in relative humidity, cloud cover, and precipitation. Soil moisture response to AMV also plays a role in the modulation of heat wave occurrence. An AMV warming favors dry soil conditions over northern Mexico and the southern United States by driving a year-round precipitation deficit through atmospheric teleconnections coming both directly from the North Atlantic SST forcing and indirectly from the Pacific. The indirect AMV teleconnections highlight the importance of using CGCMs to fully assess the AMV impacts on North America. Given the potential predictability of the AMV, the teleconnections discussed here suggest a source of predictability for the North American climate variability and in particular for the occurrence of heat waves at multiyear time scales. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111561
Appears in Collections: 气候减缓与适应
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作者单位: Atmosphere and Ocean Sciences, Princeton UniversityNJ, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Barcelona Supercomputing Center, Barcelona, Spain; CNRS/CERFACS CECI UMR 5318, Toulouse, France; Global and Climate Dynamics, National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Ruprich-Robert Y.,Delworth T.,Msadek R.,et al. Impacts of the Atlantic multidecadal variability on North American summer climate and heat waves[J]. Journal of Climate,2018-01-01,31(9)