气候变化领域集成服务门户(CCPortal): Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas

CCPortal

DOI	10.1016/j.atmosres.2018.08.027
	Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas
	Shrestha S.; Yao T.; Adhikari T.R.
发表日期	2019
ISSN	0169-8095
起始页码	99
结束页码	115
卷号	215
英文摘要	Understanding rainfall characteristics plays a vital role in sustainable watershed development and management, but at the same time it is challenging in mountainous regions, due to its topography complexities. This study investigates the seasonal along its associated months and annual rainfall characteristics and their variations over two distinct river basins; Kaligandaki in central west and Koshi in eastern Nepal, located on the southern slopes of the central Himalayas, which is crucial to the research of the climate change in these regions. The rainfall data series over the period of 34-year (1981–2015) of 43 stations between the elevation range of 143 m asl to 3870 m asl was used for this study. The analysis was carried out to assess the significance of rainfall trend along with its magnitude followed by its abrupt shift by using the Mann-Kendall test, Sen's test and Sequential Mann-Kendall test respectively. Furthermore, multitaper method was used to confirm the influence of large-scale circulation indices over the study area. An increasing pattern of rainfall from south to north was observed throughout all season in Koshi basin which was not seen in the Kaligandaki basin, indicating the effects of orography along with monsoon. Both basins share a similar pattern of rainfall between annual and monsoonal rainfall, supporting that both basins are dominated by the monsoon. The transition months between the seasons showed almost similar spatial distribution but different from other months of respective seasons. The results showed that the seasonal and annual rainfall declined in most of the stations of both the basins, except during pre-monsoon where it showed increased rainfall. But only a few stations showing such changes were statistically significant. In fact, these noticeable significant decreases were observed especially in the southern and northern region of Koshi basin while in Kaligandaki basin, it was found either in central or in the southern region. Furthermore, the trend shift analysis identified change points during 1980s or early 1990s, but most significant shifts were observed in recent years with some exceptions. Spectral analysis showed significant peaks at periodicity ranging 2–5 years, suggesting a potential association with Quasi-Biennial Oscillations (QBO) and El Niño-Southern Oscillation (ENSO). © 2018 Elsevier B.V.
英文关键词	Central Himalayas; Kaligandaki basin; Koshi basin; Rainfall; Spatial variation; Trend
语种	英语
scopus关键词	Atmospheric pressure; Atmospheric thermodynamics; Climate change; Spectrum analysis; Stream flow; Watersheds; Himalayas; Kaligandaki basin; Koshi basin; Spatial variations; Trend; Rain; annual variation; El Nino-Southern Oscillation; precipitation intensity; quasi-biennial oscillation; river basin; seasonal variation; spatial variation; trend analysis; Himalayas; Kosi River
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162225
作者单位	Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China; Central Department of Hydrology and Meteorology, Tribhuvan University, Kirtipur, Kathmandu, Nepal
推荐引用方式 GB/T 7714	Shrestha S.,Yao T.,Adhikari T.R.. Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas[J],2019,215.
APA	Shrestha S.,Yao T.,&Adhikari T.R..(2019).Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas.Atmospheric Research,215.
MLA	Shrestha S.,et al."Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas".Atmospheric Research 215(2019).