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基于地基GPS资料分析天山山区夏季大气可降水量特征
于晓晶1,2, 唐永兰3, 于志翔4
(1.中国气象局乌鲁木齐沙漠气象研究所;2.中亚大气科学研究中心;3.中国气象局武汉暴雨研究所 暴雨监测预警湖北省重点实验室;4.乌鲁木齐气象卫星地面站)
Characteristics of precipitable water vapor over the Tianshan Mountains based on GPS observations
YU Xiaojing<sub>1,2, Tang yonglan3, Yu Zhixiang4
(1.Institute of Desert Meteorology, CMA;2.Center for Central Asian Atmosphere Science Research;3.Center for Central Asian Atmosphere Science Research, Urumqi 830002, China;4.rumqi Meteorological Satellite Ground Station, National Satellite Meteorological Center)
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投稿时间:2018-08-21    修订日期:2019-11-04
中文摘要: 基于新疆天山山区2012—2015年夏季的GPS/PWV资料、探空资料和逐日24 h累积降水资料,运用多种统计方法,分析天山山区夏季大气可降水量(PWV)的时空变化特征,并初步探讨其原因。从夏季平均值分布来看,天山山区各站PWV分布存在明显差异,与海拔高度呈显著负相关关系;且低海拔站点PWV比高海拔站点表现出更大的发散性和可变性,有雨日PWV的极值、中位数等整体高于无雨日。天山山区夏季PWV表现出显著的月变化和日变化。大部分站点7月PWV最大,6月次之,8月最少;一日之中在10:00左右出现日最大值,个别站点表现出不同的变化特征,且有雨日和无雨日也存在一定差异。天山山区各站夏季降水量与其PWV关联性不明显,降水量和水分循环指数均与海拔高度呈显著正相关关系。这可能由于夏季山区高海拔站点更易产生局地对流性降水,从而增加水分循环次数所致。
Abstract:Based on the precipitable water vapor (PWV) data observed by Global Positioning System (GPS), the radiosonde data and daily precipitation data, employing several statistical methods, characteristics of summer PWV over the Tianshan Mountains and their possible reasons are analyzed. For the distribution of summer PWV average, remarkable differences exist among stations over the Tianshan Mountains, and there is a significant negative relationship between PWV and station altitude. And PWV at lower altitudes exhibits more variabilities and divergences than that at higher altitudes. The extreme and median of PWV in rainy days exceed those in rainless days. Monthly variation of summer PWV is considerable, which behaves maximum in July and minimum in August at most stations. As to diurnal variation, most stations appear maximum at about 10:00 while individual stations exhibit opposite characteristics, and discrepancies still exit between rainy days and rainless days. There is no direct connection between precipitation and PWV. However, precipitation and water cycle index are positively related to station altitude, which maybe be attributed to more local convective precipitation processes over higher mountains in summer and more water cycle frequencies.
文章编号:201808210371     中图分类号:    文献标志码:
基金项目:国家自然科学基金(41505025),新疆维吾尔自治区自然科学基金项目(2018D01B06),中国沙漠气象科学研究基金(Sqj2011002)
引用文本:
于晓晶,唐永兰,于志翔,2019.[en_title][J].Meteor Mon,(12):-.
YU Xiaojing<sub>,Tang yonglan,Yu Zhixiang,2019.Characteristics of precipitable water vapor over the Tianshan Mountains based on GPS observations[J].Meteor Mon,(12):-.