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DOI | 10.1007/s00382-018-4552-1 |
Long term observations on stable isotope ratios in rainwater samples from twin stations over Southern India; identifying the role of amount effect, moisture source and rainout during the dual monsoons | |
Rahul, P.1,2; Ghosh, Prosenjit1,3 | |
2019-06-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52期号:11页码:6893-6907 |
文章类型 | Article |
语种 | 英语 |
国家 | India; Netherlands |
英文摘要 | The dominant factor that controls the rainwater isotope ratios in the tropics is believed to be the local or instantaneous rainfall amount. This notion was challenged in several recent observations indicating that the stable ratios in rainwater are controlled by other factors such as source water composition and intensity of convective activity. Since amount effect is the basis for paleoclimate reconstruction of rainfall it is important to develop comprehensive knowledge about it at different time scales. Here we investigated the relationship of rainwater O-18 with the local or instantaneous rainfall amount at different time scales at two Indian stations, Thiruvananthapuram (TRV) and Bangalore (BLR), for four years covering the dual monsoon systems [Indian Summer Monsoon (ISM) and Northeast Monsoon (NEM)]. It was observed that the seasonal variations are more pronounced over BLR due to its continental location in the central Southern peninsular India, compared to TRV which is a coastal station. Isotopically enriched samples were found during seasonal high temperature and low relative humidity at the respective stations. The intra-event observations indicated that the amount effect' at the intra-event scale was significant due to post-condensation evaporation, which was supported by low d-excess values and its inverse correlation with rainfall amount. The correlation between event based O-18 and local rainfall amount for both the stations was weak (r=0.2 and 0.3) whereas the isotopic signature was sensitive to the convective activity during the monsoon period. Significant negative spatio-temporal correlations of O-18 over the moisture convergence regions were obtained with proxies of convective activity over parts of the Arabian Sea as well as over the regions of moisture pathways associated with synoptic scale disturbances from the Bay of Bengal. We observed that the correlation pattern varies with the seasonal changes of moisture source and transport pathways during the periods of ISM and NEM. |
英文关键词 | Stable isotopes Amount effect Monsoon Convective activity |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000469016700034 |
WOS关键词 | ARABIAN SEA ; PRECIPITATION DELTA-O-18 ; CLIMATE CONTROLS ; SUMMER MONSOON ; WATER-VAPOR ; RAINFALL ; REGION ; OXYGEN ; MODEL |
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/183489 |
专题 | 气候变化 |
作者单位 | 1.Indian Inst Sci, Ctr Earth Sci, Bangalore, Karnataka, India; 2.Univ Utrecht, Inst Marine & Atmospher Res Utrecht, Utrecht, Netherlands; 3.Indian Inst Sci, Div Ctr Climate Change, Bangalore, Karnataka, India |
推荐引用方式 GB/T 7714 | Rahul, P.,Ghosh, Prosenjit. Long term observations on stable isotope ratios in rainwater samples from twin stations over Southern India; identifying the role of amount effect, moisture source and rainout during the dual monsoons[J]. CLIMATE DYNAMICS,2019,52(11):6893-6907. |
APA | Rahul, P.,&Ghosh, Prosenjit.(2019).Long term observations on stable isotope ratios in rainwater samples from twin stations over Southern India; identifying the role of amount effect, moisture source and rainout during the dual monsoons.CLIMATE DYNAMICS,52(11),6893-6907. |
MLA | Rahul, P.,et al."Long term observations on stable isotope ratios in rainwater samples from twin stations over Southern India; identifying the role of amount effect, moisture source and rainout during the dual monsoons".CLIMATE DYNAMICS 52.11(2019):6893-6907. |
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