DOI: 10.1002/joc.5433
论文题名: Contrast in monsoon precipitation over oceanic region of north Bay of Bengal and east equatorial Indian Ocean
作者: Pokhrel S. ; Hazra A. ; Saha S.K. ; Chaudhari H.S. ; Metya A. ; Ghude S.D. ; Konwar M.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38 起始页码: e1061
结束页码: e1075
语种: 英语
英文关键词: east equatorial Indian ocean
; microphysics
; north Bay of Bengal
; precipitation
; probability distribution function
Scopus关键词: Distribution functions
; Precipitation (chemical)
; Probability distributions
; Thermodynamics
; Bay of Bengal
; Equatorial Indian Ocean
; Large-scale dynamics
; Long-wave radiation
; Microphysical process
; Microphysics
; Monsoon precipitation
; Rainfall distribution
; Rain
; Hadley cell
; humidity
; longwave radiation
; monsoon
; precipitation (climatology)
; probability density function
; rainfall
; regional climate
; Bay of Bengal
; Indian Ocean
; Indian Ocean (Equatorial)
英文摘要: This study explores the possible causes of rainfall distribution over the two major oceanic raining regions of the north Bay of Bengal (nBoB) and the east equatorial Indian Ocean (eEIO). Despite 17% difference in vertically averaged humidity, there is almost 34% difference in mean rainfall over these two regions. The climatological seasonal [June–September (JJAS)] mean (standard deviation) rainfall over nBoB region is always higher (lower) than that over the eEIO region in all the independent data used. The eEIO region has a much larger percentage of low stratiform and convective rainfall (<5 mm day−1) distribution as compared to nBoB, which is totally opposite in case of moderate stratiform and convective rainfall (>5 mm day−1) distribution. This is further substantiated by a much lower values of outgoing long-wave radiation (OLR) in nBoB (<200 W m−2) as compared to the eEIO (217 W m−2) region. Mean Hadley circulation along with relative vorticity/divergence profile supports more intense (gentle) updrafts over nBoB (eEIO) region. Latent heat (LH) is almost three times at the upper level (∼8 km) in case of nBoB as compared to eEIO; however, at the lower level (∼3 km) LH is marginally higher over eEIO region. Microphysical variables, namely cloud ice optical thickness and cloud ice water path, are in much larger quantities over nBoB as compared to eEIO. Furthermore, the cold (warm) rain processes dominate among other microphysical processes over nBoB (eEIO) region. Thus, the interplay among large-scale dynamics, thermodynamics and microphysics is very crucial in the formation of deep clouds and convective rain over the nBoB region and similarly shallow clouds and stratiform rain over the eEIO region. This study will be very useful to guide present-day coupled models for proper representation of different rain components over the nBoB and eEIO region. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116965
Appears in Collections: 气候减缓与适应
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作者单位: Indian Institute of Tropical Meteorology (IITM), Pune, India; Savitribai Phule Pune University (SPPU), India
Recommended Citation:
Pokhrel S.,Hazra A.,Saha S.K.,et al. Contrast in monsoon precipitation over oceanic region of north Bay of Bengal and east equatorial Indian Ocean[J]. International Journal of Climatology,2018-01-01,38