气候变化领域集成服务门户(CCPortal): An evaluation of the synergy of satellite passive microwave observations between 1.4 and 36 GHz, for vegetation characterization over the Tropics

CCPortal

DOI	10.1016/j.rse.2021.112346
	An evaluation of the synergy of satellite passive microwave observations between 1.4 and 36 GHz, for vegetation characterization over the Tropics
	Prigent C.; Jimenez C.
发表日期	2021
ISSN	00344257
卷号	257
英文摘要	Satellite passive microwave observations from 1.4 to 36 GHz already showed sensitivity to vegetation parameters, primarily through the calculations of the Vegetation Optical Depth (VOD) at individual window frequencies, separately. Here we evaluate the synergy of this frequency range for vegetation characterization, through the estimation of two vegetation parameters, its foliage and the photosynthesis activity as described by the Normalized Difference Vegetation Index (NDVI), and its woody components and carbon stock as described by the Above Ground Carbon (AGC), using different combinations of channels in the considered frequency range. Neural network retrievals are trained on these two vegetation parameters (NDVI and AGC), for several microwave channel combinations, including the future Copernicus Imaging Microwave Radiometer (CIMR) that will observe simultaneously in window channels from 1.4 to 36 GHz, for the first time. This methodology avoids the use of any assumptions in the complex interaction between the surface (vegetation and soil) and the radiation, as well as any ancillary observations, to propose a genuine and objective evaluation of the information content of the passive microwave frequencies for vegetation characterization. Our analysis quantifies the synergy of the microwave frequencies from 1.4 to 36 GHz, and shows the expected potential of the CIMR instrument for the monitoring of vegetation parameters in tropical environments, as compared to current instruments. It also confirms that the 1.4 GHz observations have a high sensitivity to AGC, as compared to the other single frequencies up to 36 GHz, at least under tropical environments. © 2021 Elsevier Inc.
英文关键词	Above ground carbon; Microwave imagers; NDVI; Vegetation remote sensing
语种	英语
scopus关键词	Carbon; Frequency estimation; Microwave devices; Microwave frequencies; Petroleum reservoir evaluation; Tropics; Information contents; Microwave radiometers; Normalized difference vegetation index; Objective evaluation; Satellite passive microwave; Tropical environments; Vegetation optical depth; Vegetation parameters; Vegetation; artificial neural network; foliage; frequency analysis; microwave radiometer; NDVI; optical depth; photosynthesis; satellite altimetry; synergism
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178906
作者单位	CNRS, LERMA, Paris Observatory, PSL, 61 avenue de l'Observatoire, Paris, 75014, France; Estellus, 93 boulevard de Sebastopol, Paris, 75002, France
推荐引用方式 GB/T 7714	Prigent C.,Jimenez C.. An evaluation of the synergy of satellite passive microwave observations between 1.4 and 36 GHz, for vegetation characterization over the Tropics[J],2021,257.
APA	Prigent C.,&Jimenez C..(2021).An evaluation of the synergy of satellite passive microwave observations between 1.4 and 36 GHz, for vegetation characterization over the Tropics.Remote Sensing of Environment,257.
MLA	Prigent C.,et al."An evaluation of the synergy of satellite passive microwave observations between 1.4 and 36 GHz, for vegetation characterization over the Tropics".Remote Sensing of Environment 257(2021).