中國(guó)近20 a衛(wèi)星遙感土壤濕度的季節(jié)變化及其驗(yàn)證

doi:10.3969/2014jms.0090

首頁(yè) > 過(guò)刊瀏覽>2015年第35卷第6期 >744-750. DOI:10.3969/2014jms.0090

中國(guó)近20 a衛(wèi)星遙感土壤濕度的季節(jié)變化及其驗(yàn)證
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                        10.3969/2014jms.0090
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金面上項(xiàng)目(41375099);國(guó)家自然科學(xué)基金重大研究計(jì)劃項(xiàng)目(91337108);南京信息工程大學(xué)人才啟動(dòng)基金(2241051301004);江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目(PAPD);長(zhǎng)江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(PCSIRT)

Seasonal variation and validation of soil moisture based on recent 20 a satellite-derived data in China

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摘要:

分析了歐洲空間局最近基于多顆衛(wèi)星微波資料研發(fā)的ECV土壤濕度產(chǎn)品的季節(jié)性干濕變化,并與國(guó)家氣象局提供的站點(diǎn)資料做了對(duì)比驗(yàn)證。研究發(fā)現(xiàn):主動(dòng)與被動(dòng)遙感土壤濕度的干濕季節(jié)變化在中國(guó)東部季風(fēng)區(qū)有顯著的不一致性。在中國(guó)東部季風(fēng)區(qū),被動(dòng)遙感土壤濕度的干濕季變化和站點(diǎn)觀測(cè)一致,均表現(xiàn)出夏季是干季、冬季是濕季的特征;而主動(dòng)遙感的數(shù)據(jù)則存在較大的空間差異,華北地區(qū)與被動(dòng)遙感數(shù)據(jù)較為一致,華南地區(qū)則呈現(xiàn)夏季為濕季、冬季為干季的反位相特征。兩者的不一致性說(shuō)明,針對(duì)歐洲空間局開發(fā)ECV土壤濕度產(chǎn)品的過(guò)程,融合主動(dòng)遙感和被動(dòng)遙感資料,研制長(zhǎng)序列土壤濕度產(chǎn)品的思路在中國(guó)東部季風(fēng)區(qū)不可行。

Abstract:

The seasonal dry-moist variation of ECV soil moisture product developed by European Space Agency based on the microwave observations of multiple satellites is analyzed, and then the analysis results were compared with the station-based observations from National Meteorological Administration. Results show that the passive and active satellite data provide significantly different seasonal variation of soil moisture. In the summer monsoon region of East China, the passive data are characterized by a dry summer and a wet winter which are consistent with in situ observation. However, the active data has spatial difference of seasonal variation. The seasonal variation of soil moisture from active data is similar to the observations in North China, but it is in the opposite phase in the South China. The inconsistency of seasonal variations between them reveals that it is not a proper way to produce a multi-decadal soil moisture data in the summer monsoon region of East China by combining the passive and active microwave observations.

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陳立波,何金海,譚,王國(guó)杰.中國(guó)近20 a衛(wèi)星遙感土壤濕度的季節(jié)變化及其驗(yàn)證.氣象科學(xué),2015,35(6):744-750 CHEN Libo, HE Jinhai, TAN Yan, WANG Guojie. Seasonal variation and validation of soil moisture based on recent 20 a satellite-derived data in China. Journal of the Meteorological Sciences,2015,35(6):744-750

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