成都地區(qū)秋、冬季GPS可降水量的時(shí)空分析

doi:10.3969/2012jms.00**

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成都地區(qū)秋、冬季GPS可降水量的時(shí)空分析
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                        10.3969/2012jms.00**
                    
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中圖分類(lèi)號(hào):P426.614
基金項(xiàng)目:中國(guó)氣象局成都區(qū)域氣象中心區(qū)域重大科研業(yè)務(wù)項(xiàng)目(2007-11)，成都市氣象局業(yè)務(wù)技術(shù)研究項(xiàng)目，成都信息工程學(xué)院自然科學(xué)與技術(shù)發(fā)展基金項(xiàng)目(CSRF2007d2)

On the spatial-temporal analysis of GPS precipitable water vapor in autumn and winter in Chengdu Plain

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摘要:

利用成都地區(qū)5個(gè)測(cè)站地基GPS2007年9月—2008年2月的觀測(cè)數(shù)據(jù)，解算出1 min間隔的天頂總延遲，結(jié)合自動(dòng)氣象站資料計(jì)算出30 min間隔的大氣可降水量(GPS-PWV)。對(duì)月平均的GPS-PWV分析表明：秋、冬季變化趨勢(shì)從9月開(kāi)始下降，1月達(dá)到最小值，2月又逐漸上升。在大氣環(huán)流相同的情況下，地理位置相近的站，海拔高的地區(qū)大氣中的水汽量比海拔低的地區(qū)要少，且變化較大；海拔高度相近的站，大氣中的水汽含量由南向北減少。日合成分析顯示：在靜穩(wěn)天氣下，日變化特征顯著，具有雙峰型特征：白天峰值與氣溫的最大值相對(duì)應(yīng)；夜間峰值與降水量的峰值相對(duì)應(yīng)；GPS-PWV與地面空氣相對(duì)濕度白天呈負(fù)相關(guān)，夜間呈正相關(guān)。

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The estimates of total zenith delay are available based on GPS data per 1min from the ground-based GPS network in Chengdu plain during the period of September 2007 to February 2008. The estimates of every 30 min precipitable water vapor (PWV) derived from GPS are obtained by combining meteorological data from automatic weather stations. By analyzing monthly GPS-PWV of five stations in Chengdu plain it shows that the monthly GPS-PWV ascend after first descending, namely it starts to descend from September, to reach minimum in January, then to ascend in February. While the stations are close and in the same circulation, the monthly value of GPS-PWV with high altitude is lower than the low altitude; the variation of GPS-PWV is more evident at the high altitude. When the altitude is similar, GPS-PWV reduces from south to north. The diurnal variations of GPS-PWV and some surface meteorological elements are composite during the cold season at Chengdu station. The feature of diurnal variation of GPS-PWV at Chengdu station is obvious: it is a bimodal curve. The peak value of GPS-PWV in the daytime is corresponding to the maximum value of temperature and it is relative to the peak of precipitation in the night. Though the relationship between GPS-PWV and relative humidity of surface atmosphere in the daytime is negative correlation, it is positive correlation in the night. 

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陳嬌娜,李國(guó)平,黃文詩(shī).成都地區(qū)秋、冬季GPS可降水量的時(shí)空分析.氣象科學(xué),2009,(5):682-686 Chen Jiaona ,Li Guoping, Huang Wenshi. On the spatial-temporal analysis of GPS precipitable water vapor in autumn and winter in Chengdu Plain. Journal of the Meteorological Sciences,2009,(5):682-686

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