地基GPS遙感西藏改則站大氣可降水量變化特征及其與夏季降水的關(guān)系

doi:10.3969/2015jms.0104

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地基GPS遙感西藏改則站大氣可降水量變化特征及其與夏季降水的關(guān)系
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                        10.3969/2015jms.0104
                    
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基金項(xiàng)目:國家自然科學(xué)基金資助項(xiàng)目（41275095），國家重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃項(xiàng)目（2012CB955204），公益性行業(yè)（氣象）科研專項(xiàng)（GYHY201406001），中國氣象局氣象關(guān)鍵技術(shù)集成與應(yīng)用項(xiàng)目（CMAJG2013M28）聯(lián)合資助

Variation characteristics of GPS-retrieved atmospheric precipitable water vapor and its relation with summer precipitation at Gaize station

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利用中日J(rèn)ICA項(xiàng)目2010-2011年期間的地基GPS探測逐時大氣可降水量（PWV）資料，分析了西藏西部改則站PWV的季節(jié)變化和日變化特征及其與夏季降水的關(guān)系。結(jié)果表明：（1）該站PWV存在明顯的季節(jié)變化特征，其高（低）值出現(xiàn)在6-9（12-3）月，呈現(xiàn)出明顯的單峰型變化特征，同時表現(xiàn)出春季持續(xù)上升和秋季快速下降的特點(diǎn)。（2）諧波分析表明，改則站各季PWV日變化均以日循環(huán)為主，只是夏季也表現(xiàn)出一定的半日循環(huán)特征。（3）改則站PWV存在明顯的日變化特征，低值一般出現(xiàn)在當(dāng)?shù)貢r間的凌晨至次日上午，各季谷值普遍出現(xiàn)在當(dāng)?shù)貢r間10：00前后；高值通常出現(xiàn)在當(dāng)?shù)氐奈绾笾廖缫?，但各季最大值出現(xiàn)時間不固定；（4）改則站降水通常都發(fā)生在PWV高值期，降水發(fā)生前后PWV有明顯的逐漸積累與迅速下降的變化特征，PWV達(dá)到峰值的時間提前于降水。PWV對累積降水頻次的影響要比累積降水量更顯著。

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By using the ground based GPS hourly Precipitable Water Vapor (PWV) data from the Japan International Cooperation Agency (JICA) project during 2010-2011, the seasonal and diurnal variation features of PWV as well as its relation with summer rainfall at Gaize station located in the west of Tibetan Plateau have been investigated. Results show that (1) the PWV has significant seasonal variation with the maximum(minimum) value in June-September (December-March), which presents obviously unimodal type, as well as the characteristics of continuous rising in spring and quickly decreasing in autumn. (2) The harmonic analysis indicates that the diurnal cycle is the main signal of PWV diurnal variation of each season at Gaize station and the variation in summer also presents characteristics of semidiurnal circle to some extent. (3) The PWV at Gaize station reveals obvious diurnal variation with high value ordinarily appearing between afternoon and midnight of local time and the low value appearing from dawn to the forenoon of the next day. The minimum of each season usually occurs about 10:00, but the time of the maximum in each season is different. (4) Precipitation often occurs when the PWV is high. PWV accumulates gradually and drops rapidly before and after precipitation and its peak time is prior to precipitation. PWV has more effects on the accumulative rainfall frequency than accumulative precipitation.

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周順武,王爍,馬思琪,王傳輝,丁鋒.地基GPS遙感西藏改則站大氣可降水量變化特征及其與夏季降水的關(guān)系.氣象科學(xué),2016,36(3):403-410 ZHOU Shunwu, WANG Shuo, MA Siqi, WANG Chuanhui, DING Feng. Variation characteristics of GPS-retrieved atmospheric precipitable water vapor and its relation with summer precipitation at Gaize station. Journal of the Meteorological Sciences,2016,36(3):403-410

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收稿日期:2014-11-03
最后修改日期:2014-12-05
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在線發(fā)布日期: 2016-07-14
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