DOI: 10.1007/s00382-015-2614-1
Scopus记录号: 2-s2.0-84957432695
论文题名: The resolution sensitivity of the South Asian monsoon and Indo-Pacific in a global 0.35° AGCM
作者: Johnson S.J. ; Levine R.C. ; Turner A.G. ; Martin G.M. ; Woolnough S.J. ; Schiemann R. ; Mizielinski M.S. ; Roberts M.J. ; Vidale P.L. ; Demory M.-E. ; Strachan J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-03-04 起始页码: 807
结束页码: 831
语种: 英语
英文关键词: African highlands
; Asian monsoon
; High resolution
; Maritime Continent
; Monsoon depressions
; Orography
英文摘要: The South Asian monsoon is one of the most significant manifestations of the seasonal cycle. It directly impacts nearly one third of the world’s population and also has substantial global influence. Using 27-year integrations of a high-resolution atmospheric general circulation model (Met Office Unified Model), we study changes in South Asian monsoon precipitation and circulation when horizontal resolution is increased from approximately 200–40 km at the equator (N96–N512, 1.9°–0.35°). The high resolution, integration length and ensemble size of the dataset make this the most extensive dataset used to evaluate the resolution sensitivity of the South Asian monsoon to date. We find a consistent pattern of JJAS precipitation and circulation changes as resolution increases, which include a slight increase in precipitation over peninsular India, changes in Indian and Indochinese orographic rain bands, increasing wind speeds in the Somali Jet, increasing precipitation over the Maritime Continent islands and decreasing precipitation over the northern Maritime Continent seas. To diagnose which resolution-related processes cause these changes, we compare them to published sensitivity experiments that change regional orography and coastlines. Our analysis indicates that improved resolution of the East African Highlands results in the improved representation of the Somali Jet and further suggests that improved resolution of orography over Indochina and the Maritime Continent results in more precipitation over the Maritime Continent islands at the expense of reduced precipitation further north. We also evaluate the resolution sensitivity of monsoon depressions and lows, which contribute more precipitation over northeast India at higher resolution. We conclude that while increasing resolution at these scales does not solve the many monsoon biases that exist in GCMs, it has a number of small, beneficial impacts. © 2015, The Author(s). 资助项目: DECC, National Centre for Atmospheric Science
; NCAS, National Centre for Atmospheric Science
; NERC, National Centre for Atmospheric Science
; NERC, National Centre for Atmospheric Science
; NERC, National Centre for Atmospheric Science
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53842
Appears in Collections: 过去全球变化的重建
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作者单位: National Centre for Atmospheric Science - Climate Directorate, Department of Meteorology, University of Reading, Earley Gate, Reading, United Kingdom; Met Office Hadley Centre, FitzRoy Road, Exeter, United Kingdom
Recommended Citation:
Johnson S.J.,Levine R.C.,Turner A.G.,et al. The resolution sensitivity of the South Asian monsoon and Indo-Pacific in a global 0.35° AGCM[J]. Climate Dynamics,2016-01-01,46(2017-03-04)