Plateau Meteorology

Plateau Meteorology >

2017 , Vol. 36 >Issue 6: 1557 - 1566

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00014

Fine-scale Characteristics of Rainfall in Erhai Lake Basin under Continuous Drought Conditions

  • XU Anlun ,
  • LI Yu ,
  • YANG Fan ,
  • SU Jinlan ,
  • DONG Baoju ,
  • SUN Jihua
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  • Dali National Climate Observatory, Dali 671003, Yunnan, China;Eryuan Meteorological Station of Yunnan Province, Eryuan 671200, Yunnan, China;Yunnan Meteorological Observatory, Kunming 650034, Yunnan, China

Received date: 2016-11-07

  Online published: 2017-12-28

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Abstract

Based on the 2010-2015 hourly rainfall data from 22 automatic weather stations in Erhai Lake basin, the fine-scale characteristics of rainfall was analyzed under continuous drought conditions. The results show that the temporal distribution of rainfall in Erhai Lake basin is uneven, which means that the rainfall is mainly concentrated in summer and autumn, and the nocturnal rainfall is obvious. The peaks of rainfall amount, rainfall intensity and rainfall hours appear around 06:00, 04:00 and 06:00 respectively, and their valleys around 13:00, 23:00 and 11:00 (Beijing time) respectively. The contributed percentage is the biggest for long duration rainfall events to the accumulated rainfall amount, bigger for medium duration rainfall events, the smallest for short duration rainfall events. The spatial distribution of rainfall in Erhai Lake basin is significant difference, which means that annual rainfall amount in west is more than that in east of the Erhai Lake area. The rainfall amount, and rainfall hours and different magnitude rainfall days are larger in spring, summer, autumn, winter and in whole year along Diancangshang Mountains line, and their largest values often appear in Yinqiao town, Dali city, Yunnan province. This largest values region is located in the upwind of prevailing wind (east wind), the second prevailing wind (east southeast wind) and in the downwind of the third prevailing wind (west northwest wind). In addition, the temporal and spatial distribution of rainfall in Erhai Lake basin is closely related to the monsoon climate, complex terrain, prevailing wind effect and so on.

Key words： Erhai Lake basin; rainfall; fine-scale character

Cite this article

XU Anlun , LI Yu , YANG Fan , SU Jinlan , DONG Baoju , SUN Jihua . Fine-scale Characteristics of Rainfall in Erhai Lake Basin under Continuous Drought Conditions[J]. Plateau Meteorology, 2017 , 36(6) : 1557 -1566 . DOI: 10.7522/j.issn.1000-0534.2017.00014

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