气候变化领域集成服务门户(CCPortal): Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation

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DOI	10.1007/s00382-020-05136-2
	Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation
	Oza H.; Padhya V.; Ganguly A.; Saikranthi K.; Rao T.N.; Deshpande R.D.
发表日期	2020
ISSN	0930-7575
起始页码	2745
结束页码	2757
卷号	54
英文摘要	Long term (2005–2016) daily precipitation isotope data (δ18O, δD and d-excess) from Ahmedabad in semi-arid Western India are examined in light of various meteorological parameters and air parcel trajectories to identify prominent patterns in the isotopic character and discern the underlying hydrometeorological processes. One of the most prominent and systematic annual patterns is the isotopic depletion (average δ18O: − 2.5‰ in Jun–Jul; − 5.2‰ in Aug–Sept) in the second half of the Indian Summer Monsoon (ISM), which is observed in the 11 out of the 12 years of this study. Four geographically feasible causal factors have been examined if they contribute to observed late monsoon isotopic depletion. These factors are: (1) increased contribution of terrestrially recycled vapor; (2) intra-seasonal change in sea-surface, surface-air and cloud base temperatures; (3) increased rain-out fraction from marine vapor parcel; and (4) increase in relative proportion of convective rain. It is inferred from the present study that isotopic depletion in the second half of ISM is associated with: (1) increased contribution (45% from 36%) of terrestrially recycled moisture; (2) 1.9° C lower cloud base temperature; (3) increased rainout fraction due to decreased wind velocity (6.9 m/s from 8.8 m/s); and (4) an increase of 22.3% in the proportion of convective rain. Daily rain events with atypical isotopic composition (20‰ < d-excess < 0‰) are ascribed mainly to local weather perturbations causing sudden updraft of moist air facilitating terrestrial recycling of water vapor. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Indian summer monsoon; Precipitation; Recycling; Stable isotopes; Western India
语种	英语
scopus关键词	hydrometeorology; isotopic composition; monsoon; precipitation (climatology); semiarid region; stable isotope; summer; Ahmedabad; Gujarat; India
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145571
作者单位	Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad, 380009, India; Indian Institute of Technology Gandhinagar, Gandhinagar, 382355, India; Indian Institute of Science Education and Research, Tirupati, 517507, India; National Atmospheric Research Laboratory, Gadanki, 517112, India
推荐引用方式 GB/T 7714	Oza H.,Padhya V.,Ganguly A.,et al. Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation[J],2020,54.
APA	Oza H.,Padhya V.,Ganguly A.,Saikranthi K.,Rao T.N.,&Deshpande R.D..(2020).Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation.Climate Dynamics,54.
MLA	Oza H.,et al."Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation".Climate Dynamics 54(2020).