Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD028470 |
Precipitation Origins and Key Drivers of Precipitation Isotope (O-18, H-2, and O-17) Compositions Over Windhoek | |
Kaseke, Kudzai Farai1; Wang, Lixin1; Wanke, Heike2; Tian, Chao1; Lanning, Matthew1; Jiao, Wenzhe1 | |
2018-07-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:14页码:7311-7330 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Namibia |
英文摘要 | southern African climate is characterized by large precipitation variability, and model precipitation estimates can vary by 70% during summer. This may be partly attributed to underestimation and lack of knowledge of the exact influence of the Atlantic Ocean on precipitation over the region. The current study models trajectories of precipitation events sampled from Windhoek (2012-2016), coupled with isotopes (delta O-18, delta H-2, delta O-17, d, and delta' O-17-delta'O-18) to determine key local drivers of isotope compositions as well as infer source evaporative conditions. Multiple linear regression analyses suggest that key drivers of isotope compositions (relative humidity, precipitation amount, and air temperature) account for 47-53% of delta O-18, delta(2) H, and delta O-17 variability. Surprisingly, precipitation delta O-18, delta H-2, and delta O-17 were independent of precipitation type (stratiform versus convective), and this may be attributed to greater modification of stratiform compared to convective raindrops, leading to convergence of isotopes from these precipitation types. Trajectory analyses showed that 78% and 21% of precipitation events during the period originated from the Indian and South Atlantic Oceans, respectively. Although precipitation from the Atlantic Ocean was significantly enriched compared to that from the Indian Ocean (p < 0.05), d was similar, suggesting significant local modification (up to 55% of d variability). Therefore, d may not be a conservative tracer of evaporation conditions at the source, at least for Windhoek. The delta'O-17-delta'(18) O appeared to be a better alternative to d, consistent with trajectory analyses, and appeared to differentiate El Nino from non-El Nino droughts. Thus, delta'O-17-delta'O-18 could be a novel tool to identify drought mechanisms. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000441965400017 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; CAVITY OUTPUT SPECTROMETER ; SOUTHERN AFRICAN RAINFALL ; STABLE WATER ISOTOPES ; AIR-MASS TRAJECTORIES ; SST DIPOLE EVENTS ; INDIAN-OCEAN ; ATMOSPHERIC CIRCULATION ; CLIMATE-CHANGE ; CLOUD EVAPORATION |
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/33987 |
专题 | 气候变化 |
作者单位 | 1.Indiana Univ Purdue Univ, Dept Earth Sci, Indianapolis, IN 46202 USA; 2.Univ Namibia, Geol Dept, Windhoek, Namibia |
推荐引用方式 GB/T 7714 | Kaseke, Kudzai Farai,Wang, Lixin,Wanke, Heike,et al. Precipitation Origins and Key Drivers of Precipitation Isotope (O-18, H-2, and O-17) Compositions Over Windhoek[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(14):7311-7330. |
APA | Kaseke, Kudzai Farai,Wang, Lixin,Wanke, Heike,Tian, Chao,Lanning, Matthew,&Jiao, Wenzhe.(2018).Precipitation Origins and Key Drivers of Precipitation Isotope (O-18, H-2, and O-17) Compositions Over Windhoek.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(14),7311-7330. |
MLA | Kaseke, Kudzai Farai,et al."Precipitation Origins and Key Drivers of Precipitation Isotope (O-18, H-2, and O-17) Compositions Over Windhoek".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.14(2018):7311-7330. |
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