GLOBAL LONG-TERM BRIGHTNESS TEMPERATURE RECORD FROM L-BAND SMOS AND SMAP OBSERVATIONS

被引：4

作者：

Li, Xiaojun ^{[1
]}

Wigneron, J-P ^{[1
]}

Frappart, F. ^{[1
,2
]}

Fan, Lei ^{[1
,3
]}

De Lannoy, Gabrielle ^{[4
]}

Konings, Alexandra G. ^{[5
]}

Liu, Xiangzhuo ^{[1
]}

Wang, Mengjia ^{[1
,6
]}

Fernandez-Moran, Robert ^{[7
]}

Al-Yaari, A. ^{[1
,8
]}

Ma, Hongliang ^{[1
,9
]}

Xing, Zanping ^{[1
,3
]}

Moisy, C. ^{[1
]}

机构：

[1] INRAE, ISPA UMR1391, Villenave Dornon, France

[2] Lab Etud Geophys & Oceanog Spatiales LEGOS, Toulouse, France

[3] Southwest Univ, Sch Geog Sci, Chongqing Jinfo Mt Karst Ecosyst Natl Observat &, Chongqing 400715, Peoples R China

[4] Katholieke Univ Leuven, Dept Earth & Environm Sci, B-3001 Heverlee, Belgium

[5] Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94304 USA

[6] Beijing Normal Univ, Fac Geog Sci, State Key Lab Remote Sensing Sci, Beijing, Peoples R China

[7] Univ Valencia, Image Proc Lab IPL, Valencia, Spain

[8] Sorbonne Univ, UMR METIS 7619, Case 105,4 Pl Jussieu, Paris, France

[9] Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & R, Wuhan 430079, Peoples R China

来源：

2021 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM IGARSS | 2021年

关键词：

SMOS; SMAP; L-band; brightness temperature; fusion; SMOS-IC; SOIL-MOISTURE PRODUCTS;

D O I：

10.1109/IGARSS47720.2021.9554579

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Passive microwave remote sensing observations at L-band provide key and global information on surface soil moisture (SM) and vegetation optical depth (VOD), which are related to the Earth water and carbon cycles. Only two spaceborne L-band sensors are currently operating: SMOS, launched end of 2009 and thus providing now a 11-year global dataset and SMAP, launched beginning of 2015. To ensure SM and L-VOD data continuity in the event of failure of one of the space-borne SMOS or SMAP sensors, we developed a consistent brightness temperature (TB) record by first producing consistent 40 degrees SMOS and SMAP TB estimates based on SMOS-IC and SMAP enhanced data resp., and then fusing them via linear fusion method. We found that SMOS and SMAP TB are strongly correlated (R > 0.90 over most of the globe) but present a small bias at both the horizontal and vertical polarizations. The preliminary evaluation results show that this bias can be adjusted using a linear fit, but further evaluation procedures are still needed. In the near future, we will develop a long-term time series of SM and L-VOD products based on this merged SMOS-SMAP TB record.

引用

页码：6108 / 6111

页数：4

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