DOI: 10.1175/JCLI-D-16-0192.1
Scopus记录号: 2-s2.0-84993990150
论文题名: Impacts of local soil moisture anomalies on the atmospheric circulation and on remote surface meteorological fields during boreal summer: A comprehensive analysis over North America
作者: Koster R.D. ; Chang Y. ; Wang H. ; Schubert S.D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 20 起始页码: 7345
结束页码: 7364
语种: 英语
Scopus关键词: Climatology
; Drought
; Earth atmosphere
; Heating
; Location
; Meteorological instruments
; Meteorology
; Moisture
; Soils
; Storm sewers
; Atmosphere-land interactions
; Atmospheric circulation
; Atmospheric circulation anomaly
; Atmospheric general circulation models
; General circulation model
; Hydrometeorology
; Planetary Waves
; Positive feedback loop
; Soil moisture
; atmospheric circulation
; atmospheric dynamics
; climatology
; drought
; general circulation model
; hydrometeorology
; planetary wave
; soil moisture
; United States
英文摘要: A series of stationary wave model (SWM) experiments are performed in which the boreal summer atmosphere is forced, over a number of locations in the continental United States, with an idealized diabatic heating anomaly that mimics the atmospheric heating associated with a dry land surface. For localized heating within a large portion of the continental interior, regardless of the specific location of this heating, the spatial pattern of the forced atmospheric circulation anomaly (in terms of 250-hPa eddy streamfunction) is largely the same: a high anomaly forms over west-central North America and a low anomaly forms to the east. In supplemental atmospheric general circulation model (AGCM) experiments, similar results are found; imposing soil moisture dryness in the AGCM in different locations within the U.S. interior tends to produce the aforementioned pattern, along with an associated near-surface warming and precipitation deficit in the center of the continent. The SWM-based and AGCM-based patterns generally agree with composites generated using reanalysis and precipitation gauge data. The AGCM experiments also suggest that dry anomalies imposed in the lower Mississippi River valley have remote surface impacts of particularly large spatial extent, and a region along the eastern half of the U.S.-Canadian border is particularly sensitive to dry anomalies in a number of remote areas. Overall, the SWM and AGCM experiments support the idea of a positive feedback loop operating over the continent: dry surface conditions in many interior locations lead to changes in atmospheric circulation that act to enhance further the overall dryness of the continental interior. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50161
Appears in Collections: 气候变化事实与影响
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作者单位: Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Goddard Earth Sciences Technology and Research, Morgan State University, Baltimore, MD, United States; Science Systems and Applications Inc., Lanham, MD, United States
Recommended Citation:
Koster R.D.,Chang Y.,Wang H.,et al. Impacts of local soil moisture anomalies on the atmospheric circulation and on remote surface meteorological fields during boreal summer: A comprehensive analysis over North America[J]. Journal of Climate,2016-01-01,29(20)