四川盆地及周邊地區(qū)TRMM 3B42數(shù)據(jù)精度檢驗

doi:10.3969/2012jms.0154

首頁 > 過刊瀏覽>2013年第33卷第5期 >526-535. DOI:10.3969/2012jms.0154

四川盆地及周邊地區(qū)TRMM 3B42數(shù)據(jù)精度檢驗
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                        10.3969/2012jms.0154
                    
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基金項目:中國科學(xué)院西部行動計劃項目(KZCX2-XB3-08)

Accuracy validation of TRMM 3B42 data in Sichuan basin and the surrounding areas

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摘要:

多源信息融合的流域水文模擬及預(yù)報技術(shù),是目前水文預(yù)報發(fā)展的一個重要方向。以易發(fā)生長江流域特大洪水的四川盆地及周邊地區(qū)為研究區(qū)域,從單個站點及子流域降水量相關(guān)性、降雨空間分布和相對誤差等方面對TRMM衛(wèi)星3B42產(chǎn)品探測精度進行了檢驗分析。結(jié)果表明:研究區(qū)TRMM 3B42數(shù)據(jù)與地面觀測數(shù)據(jù)在日、月尺度上具有較高的相關(guān)性(R >0.5),3 h尺度相關(guān)性較差(R<0.5),且3 h和日尺度在降水量峰值擬合上存在較為明顯的數(shù)值偏差和時間上的提前或延遲;不同時間尺度下兩組數(shù)據(jù)的空間分布特征總體具有較好的一致性;兩組數(shù)據(jù)2008—2010年降水量序列均值相對偏差在±10%的概率密度百分數(shù)為32.26%?？傮w上研究區(qū)TRMM 3B42數(shù)據(jù)呈現(xiàn)高估(四川盆地大部分區(qū)域),局部出現(xiàn)低估(四川盆東南及地周邊地區(qū));研究區(qū)3 h尺度TRMM 3B42數(shù)據(jù)探測精度明顯低于日尺度,高程變化對TRMM 3B42數(shù)據(jù)的探測精度具有一定影響。因此,針對該區(qū)域TRMM 3B42數(shù)據(jù)3 h和日尺度數(shù)據(jù)序列精度相對較差的問題,應(yīng)用該衛(wèi)星數(shù)據(jù)進行3 h尺度流域水文模擬及預(yù)報研究時,就需要對該區(qū)域衛(wèi)星數(shù)據(jù)和地面觀測數(shù)據(jù)進行融合,充分發(fā)揮兩種數(shù)據(jù)的優(yōu)勢。

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Merging multi-information is a very important developing direction about hydrology modeling and prediction these days. Thereby, TRMM 3B42 data and rain gauges are adopted to engage in accuracy validation in Sichuan Basin and the surrounding areas as the study area because of frequent occurrence of devastating floods in the Yangtze River basin and this paper refers to correlation, spatial distribution, and bias due to elevation, based on single ground station rainfall and subbasin area precipitation. The results indicate that the daily and monthly correlation coefficient between TRMM 3B42 data and rain gauges rainfall is quite high (R>0.5), but it is low (R<0.5) for 3-h scale. There are significant deviations about 3-hourly and daily scales. Precipitation spatial distribution has good consistency between these two group data for different temporal scales. Probability density percentage of mean rainfall time series bias is 32.26% ± 10% from 2008 to 2010. TRMM 3B42 data are overestimated in most regions of Sichuan basin in the mass, but underestimated in the partially surrounding areas of Sichuan basin. The detection accuracy of 3-h scales TRMM 3B42 data is significantly lower than that of daily scale, and it is influenced to a certain extent by the elevation changes in the whole region. Because 3-h and daily scales of TRMM 3B42 data have no good precision, they need to be calibrated by the rain gauges, in order to use these data in hydrology modeling and prediction research.

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楊云川,程根偉,范繼輝,孫建,李衛(wèi)朋.四川盆地及周邊地區(qū)TRMM 3B42數(shù)據(jù)精度檢驗.氣象科學(xué),2013,33(5):526-535 YANG Yunchuan, CHENG Genwei, FAN Jihui, SUN Jian, LI Weipeng. Accuracy validation of TRMM 3B42 data in Sichuan basin and the surrounding areas. Journal of the Meteorological Sciences,2013,33(5):526-535

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收稿日期:2012-03-23
最后修改日期:2012-07-26
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在線發(fā)布日期: 2013-10-31
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