GSTDTAP  > 气候变化
DOI10.1002/joc.5433
Contrast in monsoon precipitation over oceanic region of north Bay of Bengal and east equatorial Indian Ocean
Pokhrel, Samir1; Hazra, Anupam1; Saha, Subodh Kumar1; Chaudhari, Hemantkumar S.1; Metya, Abirlal1,2; Ghude, Sachin D.1; Konwar, Mahen1
2018-04-01
发表期刊INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN0899-8418
EISSN1097-0088
出版年2018
卷号38页码:E1061-E1075
文章类型Article
语种英语
国家India
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 (< 200W 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 (similar to 8 km) in case of nBoB as compared to eEIO; however, at the lower level (similar to 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.


英文关键词precipitation microphysics probability distribution function north Bay of Bengal east equatorial Indian ocean
领域气候变化
收录类别SCI-E
WOS记录号WOS:000431999600071
WOS关键词SUMMER MONSOON ; CLOUD MICROPHYSICS ; INTERANNUAL VARIABILITY ; CONVECTIVE SYSTEMS ; STRATIFORM RAIN ; ASIAN MONSOON ; ERA-INTERIM ; TRMM ; SATELLITE ; TROPICS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/36777
专题气候变化
作者单位1.Indian Inst Trop Meteorol, Pune 411008, Maharashtra, India;
2.Savitribai Phule Pune Univ, Pune, Maharashtra, India
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Pokhrel, Samir,Hazra, Anupam,Saha, Subodh Kumar,et al. Contrast in monsoon precipitation over oceanic region of north Bay of Bengal and east equatorial Indian Ocean[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2018,38:E1061-E1075.
APA Pokhrel, Samir.,Hazra, Anupam.,Saha, Subodh Kumar.,Chaudhari, Hemantkumar S..,Metya, Abirlal.,...&Konwar, Mahen.(2018).Contrast in monsoon precipitation over oceanic region of north Bay of Bengal and east equatorial Indian Ocean.INTERNATIONAL JOURNAL OF CLIMATOLOGY,38,E1061-E1075.
MLA Pokhrel, Samir,et al."Contrast in monsoon precipitation over oceanic region of north Bay of Bengal and east equatorial Indian Ocean".INTERNATIONAL JOURNAL OF CLIMATOLOGY 38(2018):E1061-E1075.
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