Inter-Annual Variability of Winter Precipitation Over Nepal Coupled With Ocean-Atmospheric Patterns During 1987-2015
文献类型：期刊论文
| 作者 | Hamal Kalpana2,3; Sharma Shankar2,6; Baniya Binod1,2,5; Khadka Nitesh2,4; Zhou Xu6 |
| 刊名 | FRONTIERS IN EARTH SCIENCE
 |
| 出版日期 | 2020 |
| 卷号 | 8页码:161 |
| 关键词 | winter precipitation variability dry events wet events westerlies Nepal |
| DOI | 10.3389/feart.2020.00161 |
| 产权排序 | 6 |
| 通讯作者 | Sharma, Shankar(Sharma.sh969@gmail.com) |
| 文献子类 | Article |
| 英文摘要 | Nepal is a mountainous country located on the southern slope of the central Himalayas, where the winter season contributes similar to 3% of the total annual rainfall. This study sought to investigate the inter-annual variability and associated ocean-atmospheric pattern with winter precipitation during 1987-2015. A high-resolution APHRODITE and ERA5 reanalysis datasets are used to study the Empirical Orthogonal Function (EOF), Wavelet, Composites, and Correlation analysis, respectively. The results show that the leading EOF mode captures 53.2% of the total variance, exhibiting a single mode of variability. Wavelet analysis determined 2 to 2.6 years of the significant power spectrum. The time-series of winter precipitation anomalies revealed the years 1996, 1998, 2000, 2005, 2007, and 2008 as precipitation deficit years which is supported by negative precipitation anomalies with positive outgoing longwave radiation (OLR) and vertical velocity. These phenomena are converse for wet events during the years 1988, 1995, 1997, 2002, 2012, and 2014. Furthermore, the wet (dry) years exhibit moisture convergence (divergence) with strong southwesterly (northwesterly) wind anomalies. In the wave train of westerly flow, the cyclonic and anticyclonic circulation in northern India affects the moisture transport in wet and dry years, respectively. In excess precipitation years, Surface Air Temperature (SAT) over entire northern India and adjoining Nepal and Tibetan Plateau (TP) regions have a colder temperature than in deficit precipitation years. The correlation suggests the instance of Indian Ocean Basin Mode (IOBM) and NINO3.4 impacts on the inter-annual variability of the winter precipitation. Moreover, the warming and cooling over the Indo-Pacific regions affect the Walker and Hadley circulation bringing above and below-normal precipitation, respectively, over Nepal. The observed changes in the dry and wet years during winter are useful for disaster preparedness and the planning and monitoring of water resources and agriculture. |
| 电子版国际标准刊号 | 2296-6463 |
| WOS关键词 | MONSOON RAINFALL ; AIR-TEMPERATURE ; SOUTHWEST ASIA ; DENSE NETWORK ; SURFACE ; INDIA ; DATASET ; IMPACT |
| 资助项目 | Department of Hydrology and Meteorology, Government of Nepal |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000539708100001 |
| 出版者 | FRONTIERS MEDIA SA |
| 资助机构 | Department of Hydrology and Meteorology, Government of Nepal |
| 源URL | [http://ir.imde.ac.cn/handle/131551/34909]  |
| 专题 | 中国科学院水利部成都山地灾害与环境研究所 |
| 通讯作者 | Sharma Shankar |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Land Surface Proc & Global Change Res Grp, Beijing, Peoples R China; 2.Univ Chinese Acad Sci, Beijing, Peoples R China; 3.Chinese Acad Sci, Int Ctr Climate & Environm Sci, Inst Atmospher Phys, Beijing, Peoples R China; 4.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Peoples R China 5.Tribhuvan Univ, Dept Environm Sci, Patan Multiple Campus, Patan, Nepal; 6.Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, Beijing, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Hamal Kalpana,Sharma Shankar,Baniya Binod,et al. Inter-Annual Variability of Winter Precipitation Over Nepal Coupled With Ocean-Atmospheric Patterns During 1987-2015[J]. FRONTIERS IN EARTH SCIENCE,2020,8:161. |
| APA | Hamal Kalpana,Sharma Shankar,Baniya Binod,Khadka Nitesh,&Zhou Xu.(2020).Inter-Annual Variability of Winter Precipitation Over Nepal Coupled With Ocean-Atmospheric Patterns During 1987-2015.FRONTIERS IN EARTH SCIENCE,8,161. |
| MLA | Hamal Kalpana,et al."Inter-Annual Variability of Winter Precipitation Over Nepal Coupled With Ocean-Atmospheric Patterns During 1987-2015".FRONTIERS IN EARTH SCIENCE 8(2020):161. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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