拉萨河流域高山水热分布观测结果分析
Analysis of the Observation Results of Temperature and Precipitation over an Alpine Mountain, the Lhasa River Basin
查看参考文献35篇
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文摘
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利用架设在念青唐古拉山南坡9个海拔高度(4300～5500m)的自动气象站一年(2006年8月1日-2007年7月31日)的实测数据,对山坡1.5m高度的气温和季风期(6-9月)降水随海拔梯度和时间的变化进行了分析.表明4300～4950m存在一个逆温带,逆温时间自10月至翌年4月.年逆温频率为11.5%(42天).4300～5500m年平均气温直减率为0.61℃/100m;念青唐古拉山南坡季风期各月最大降水带都在海拔5100m.最大降水高度以下,山坡降水量递增率为4～7mm/100m,最大降水高度以上,降水递减率数值上为降水递增率的1.6～2.3倍.7月和8月降水量占季风期总降水量比例大于6月和9月.降水月内分配山坡上部总体较山坡下部均匀.降水主要发生在4:00-10:00以外的时间段,而大一中雨(3～14mm/h)主要发生在18:00-22:00.山坡强降水段相对集中在4650～5100m海拔高度. |
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其他语种文摘
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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.1, and 5100 m a.s.l. |
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来源
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地理科学进展
,2009,28(2):223-230 【核心库】
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关键词
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青藏高原
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山地气候
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气温直减率
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水热条件
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降水梯度
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地址
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1.
中国科学院,青藏高原研究所, 北京, 100085
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中国科学院青藏高原研究所, 北京, 100085
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日本农业环境技术研究所, 日本, 3050053
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-6301 |
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学科
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大气科学(气象学) |
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基金
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国家973计划
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欧盟第六框架项目
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国家自然科学基金项目
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日本环境省项目
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:3575827
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