Original Articles

Analysis of the Observation Results of Temperature and Precipitation over an Alpine Mountain, the Lhasa River Basin

  • 1. Institute of Tibetan Plateau Research, CAS, Beijing 100085, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100080, China;
    3. Department of Agro-Meteorology, National Institute for Agro-Environmental Sciences, 3050053, Tsukuba, Japan

Received date: 2008-12-01

  Revised date: 2009-01-01

  Online published: 2009-03-25


Altitudinal and temporal distribution of surface based air temperatures and monsoon period precipitation were analysed, using an original data set, spanning Aug. 1, 2006 to Jul. 31, 2007, from 9 automated weather stations set up along an altitudinal gradient from 4300 to 5500 m a.s.l. on the southern slope of Nyainqentanglha Mountains, the Lhasa River basin. Surface based inversion was found typically during October to the following April. The annual inversion frequency was 11.5% (i.e. 42 days). The lapse rate of mean annual air temperature was 0.61℃/100m for the elevation interval of 4300~5500 m. Analysis on the precipitation indicated the presence of the maximum precipitation belt (MPB) at about 5100 m a.s.l, with an increasing rate of 4~7mm/100m below the MPB. The precipitation decreased at a rate of 1.6~2.3 times of the increasing rate over the MPB. The precipitation amounts in July and August were larger than those in June and September. The intra-month distributions of precipitation were generally more homogeneous for the upper hillslope than for the lower. The precipitation events generally occurred at any time except for 4:00~10:00, with the heavy rainfall(3~14mm/h) mainly occurring within 18:00~22:00. The larger precipitation events concentrated roughly between 4650 m a.s.l. and 5100 m a.s.l.

Cite this article

XIE Jian, LIU Jingshi, DU Mingyuan, KANG Shichang, WANG Kuikui . Analysis of the Observation Results of Temperature and Precipitation over an Alpine Mountain, the Lhasa River Basin[J]. PROGRESS IN GEOGRAPHY, 2009 , 28(2) : 223 -230 . DOI: 10.11820/dlkxjz.2009.02.009


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