Diurnal Variation Characteristics of GPS-Retrieved Precipitable Water Vapor over Mid-East Xizang in Summer

MA Siqi; ZHOU Shunwu; WANG Shuo; WANG Chuanhui; SUN Jihua

doi:10.7522/j.issn.1000-0534.2015.00007

Plateau Meteorology >

2016 , Vol. 35 >Issue 2: 318 - 328

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00007

Diurnal Variation Characteristics of GPS-Retrieved Precipitable Water Vapor over Mid-East Xizang in Summer

MA Siqi ,
ZHOU Shunwu ,
WANG Shuo ,
WANG Chuanhui ,
SUN Jihua

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Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;3. Anhui Provincial Meteorological Bureau, Hefei 230031, China;4. Yunnan Provincial Institute of Meteorological Sciences, Kunming 650034, China

Received date: 2014-10-27

Online published: 2016-04-28

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Abstract

JICA (Japan International Cooperation Agency) project was carried out from 2005 to 2009 which established 24 ground-based GPS stations over Qinghai-Xizang Plateau and around area. The range of mid-east Xizang includes four GPS stations:Naqu, Dingqing, Linzhi and Longzi. Using GPS-retrieved atmospheric precipitable water vapor (PWV) data of JICA from 2010 to 2013 and the hourly AWS (Automatic Weather Station) precipitation in 2011, on the basic of revealing the diurnal variation, focus on analyzing the diurnal variation characteristics with and without precipitation, as so as the relationship with accumulative precipitation. The results are obtained as follows:(1) The PWV is decreasing while the altitude and latitude increase. And it has obvious diurnal variation over mid-east Xizang. The PWV minimum ordinarily appears at 02:00 (UTC, the same as after) and then increases quickly. The high value can usually last from 08:00 to 19:00. (2) The average and anomaly range of PWV at each station is increasing with the altitude decreasing. And the PWV values in different precipitation events are obviously different. PWV with precipitation would surpass the PWV without 10.2%~31.3%. The difference may get more significant with the altitude increasing. (3) The result of harmonic analysis indicates that the diurnal (24 h) cycle is the main signal of PWV diurnal variation at each station. The signal of semi-diurnal cycle is in different extent and it gets stronger during the day without rain except Linzhi station which has a stronger diurnal cycle. (4) The largest accumulative precipitation occurs at Dingqing station in 2011, and then follows Naqu. The diurnal variation of precipitation has significant characteristic of diurnal cycle at each station. And precipitations often occur after nightfall. The peak of rainfall frequency is usually later than hourly accumulative precipitation. (5) PWV accumulates gradually and decreases rapidly before and after precipitation. The time when PWV begins to rise is generally earlier than hourly accumulative precipitation and rainfall frequency. The precipitation reaches the peak as PWV is still high.

Key words： Ground-based GPS; Mid-east Xizang; Precipitable water v; Precipitation; Diurnal variation

Cite this article

MA Siqi , ZHOU Shunwu , WANG Shuo , WANG Chuanhui , SUN Jihua . Diurnal Variation Characteristics of GPS-Retrieved Precipitable Water Vapor over Mid-East Xizang in Summer[J]. Plateau Meteorology, 2016 , 35(2) : 318 -328 . DOI: 10.7522/j.issn.1000-0534.2015.00007

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