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DOI | 10.1007/s00382-017-3804-9 |
Analyzing energy-water exchange dynamics in the Thar desert | |
Raja, P.1,5; Singh, Nilendu2; Srinivas, C. V.3; Singhal, Mohit2; Chauhan, Pankaj2; Singh, Maharaj4; Sinha, N. K.4,6 | |
2018-05-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:3281-3300 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | Regions of strong land-atmosphere coupling will be more susceptible to the hydrological impacts in the intensifying hydrological cycle. In this study, micrometeorological experiments were performed to examine the land-atmosphere coupling strength over a heat low region (Thar desert, NW India), known to influence the Indian summer monsoon (ISM). Within the vortex of Thar desert heat low, energy-water exchange and coupling behavior were studied for 4 consecutive years (2011-2014) based on sub-hourly measurements of radiative-convective flux, state parameters and sub-surface thermal profiles using lead-lag analysis between various E-W balance components. Results indicated a strong (0.11-0.35) but variable monsoon season (July-September) land-atmosphere coupling events. Coupling strength declined with time, becomes negative beyond 10-day lag. Evapotranspiration (LE) influences rainfall at the monthly time-scale (20-40 days). Highly correlated monthly rainfall and LE anomalies (r = 0.55, P < 0.001) suggested a large precipitation memory linked to the local land surface state. Sensible heating (SH) during March and April are more strongly (r = 0.6-0.7) correlated to ISM rainfall than heating during May or June (r = 0.16-0.36). Analyses show strong and weak couplings among net radiation (Rn)-vapour pressure deficit (VPD), LE-VPD and Rn-LE switching between energy-limited to water-limited conditions. Consistently, +ve and -ve residual energy [(dE) = (Rn - G) - (SH + LE)] were associated with regional wet and dry spells respectively with a lead of 10-40 days. Dew deposition (18.8-37.9 mm) was found an important component in the annual surface water balance. Strong association of variation of LE and rainfall was found during monsoon at local-scale and with regional-scale LE (MERRA 2D) but with a lag which was more prominent at local-scale than at regional-scale. Higher pre-monsoon LE at local-scale as compared to low and monotonous variation in regional-scale LE led to hypothesize that excess energy and water vapour brought through advection caused by pre-monsoon rainfall might have been recycled through rainfall to compensate for early part of monsoon rainfall at local-scale. However, long-term measurements and isotope analysis would be able to strengthen this hypothesis. This study would fill the key gaps in the global flux studies and improve understanding on local E-W exchange pathways, responses and feedbacks. |
英文关键词 | Energy-mass exchange Surface fluxes Sensible heating Land-atmosphere coupling Thar desert heat low Indian summer monsoon |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429650700009 |
WOS关键词 | ATMOSPHERE COUPLING EXPERIMENT ; SURFACE HEAT FLUXES ; LAND-SURFACE ; BALANCE CLOSURE ; FEEDBACK MECHANISM ; NET RADIOMETERS ; CARBON-DIOXIDE ; BOUNDARY-LAYER ; SOIL-MOISTURE ; GREAT-PLAINS |
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/35658 |
专题 | 气候变化 |
作者单位 | 1.ICAR Cent Arid Zone Res Inst, Jodhpur 342003, Rajasthan, India; 2.Wadia Inst Himalayan Geol, Ctr Glaciol, Dehra Dun 248001, Uttarakhand, India; 3.Indira Gandhi Ctr Atom Res, Hlth Safety & Environm Grp, Kalpakkam 603102, Tamil Nadu, India; 4.ICAR Cent Arid Zone Res Inst, RRS, Jaisalmer 345001, Rajasthan, India; 5.ICAR Indian Inst Soil & Water Conservat, Res Ctr, Udhagamandalam 643004, Tamil Nadu, India; 6.ICAR Indian Inst Nat Resins & Gums, Ranchi 834010, Jharkhand, India |
推荐引用方式 GB/T 7714 | Raja, P.,Singh, Nilendu,Srinivas, C. V.,et al. Analyzing energy-water exchange dynamics in the Thar desert[J]. CLIMATE DYNAMICS,2018,50:3281-3300. |
APA | Raja, P..,Singh, Nilendu.,Srinivas, C. V..,Singhal, Mohit.,Chauhan, Pankaj.,...&Sinha, N. K..(2018).Analyzing energy-water exchange dynamics in the Thar desert.CLIMATE DYNAMICS,50,3281-3300. |
MLA | Raja, P.,et al."Analyzing energy-water exchange dynamics in the Thar desert".CLIMATE DYNAMICS 50(2018):3281-3300. |
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