6533b86ffe1ef96bd12cdbee

RESEARCH PRODUCT

Global Scale IB AMSR2 Vegetation Optical Depth at X-Band

Lei FanRobert Fernandez-moranPhilippe CiaisRui SunXiaojun LiXiangzhuo LiuChristophe MoisyMengjia WangJean-pierre WigneronFrédéric FrappartAmen Al-yaariHongliang MaZanpin Xing

subject

Biomass (ecology)Scale (ratio)BiosphereEnvironmental scienceVegetationLeaf area indexAlbedoAtmospheric sciencesWater contentNormalized Difference Vegetation Index

description

Vegetation Optical Depth (VOD) plays an increasingly important role in studying global carbon, water and energy transformation [1], [2]. This study explores the performance of the X-MEB (X-band microwave emission of the biosphere) model at global scale. Similar to the L-MEB model, the X-MEB model, built by INRAE (Institut national de recherche pour l'agriculture, l'alimentation et l'environnement) Bordeaux, aims to retrieve VOD (referred to as IB X-VOD) at X-band. To avoid the ill-posed problem caused by retrieving two parameters of interest (soil moisture (SM) and VOD) from mono-angular and dual-polarized observations (AMSR2), which are strongly correlated, we used the ERA5 SM product as an input to the X-MEB inversion. At a first step, we produced global IB X-VOD in year 2015 using the parameters (soil roughness and effective scattering albedo) calibrated in the African continent and evaluated the retrieved X-VOD with three vegetation parameters including Above-Ground Biomass (AGB), Leaf Area Index (LAI) and Normalized Difference Vegetation Index (NDVI). The evaluation results indicate X-MEB model has a great potential for global VOD retrievals from AMSR2 satellite data.

yearjournalcountryeditionlanguage
2021-07-112021 IEEE International Geoscience and Remote Sensing Symposium IGARSS
https://doi.org/10.1109/igarss47720.2021.9554945