Development of CO2 Band-Based Cloud Emission and Scattering Indices and Their Applications to FY-3D Hyperspectral Infrared Atmospheric Sounder

Autor:	Xiaolei Zou, Xinlu Xia
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	010504 meteorology & atmospheric sciences FY-3D HIRAS Infrared Science 0211 other engineering and technologies 02 engineering and technology Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Optical depth Physics::Atmospheric and Oceanic Physics Astrophysics::Galaxy Astrophysics 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing Ice cloud Hyperspectral imaging CESIs Spectroradiometer Brightness temperature Atmospheric Infrared Sounder General Earth and Planetary Sciences Environmental science Satellite Astrophysics::Earth and Planetary Astrophysics LWIR and SWIR pair
Zdroj:	Remote Sensing Volume 12 Issue 24 Remote Sensing, Vol 12, Iss 4171, p 4171 (2020)
ISSN:	2072-4292
DOI:	10.3390/rs12244171
Popis:	The Hyperspectral Infrared Atmospheric Sounder (HIRAS) onboard the Feng Yun-3D (FY-3D) satellite is the first Chinese hyperspectral infrared instrument. In this study, an improved cloud detection scheme using brightness temperature observations from paired HIRAS long-wave infrared (LWIR) and short-wave infrared (SWIR) channels at CO2 absorption bands (15-&mu m and 4.3-&mu m) is developed. The weighting function broadness and a set of height-dependent thresholds of cloud-sensitive-level differences are incorporated into pairing LWIR and SWIR channels. HIRAS brightness temperature observations made under clear-sky conditions during a training period are used to develop a set of linear regression equations between paired LWIR and SWIR channels. Moderate-resolution Imaging Spectroradiometer (MODIS) cloud mask data are used for selecting HIRAS clear-sky observations. Cloud Emission and Scattering Indices (CESIs) are defined as the differences in SWIR channels between HIRAS observations and regression simulations from LWIR observations. The cloud retrieval products of ice cloud optical depth and cloud-top pressure from the Atmospheric Infrared Sounder (AIRS) are used to illustrate the effectiveness of the proposed cloud detection scheme for FY-3D HIRAS observations. Results show that the distributions of modified CESIs at different altitudes can capture features in the distributions of AIRS-retrieved ice cloud optical depth and cloud-top pressure better than the CESIs obtained by the original method.
Databáze:	OpenAIRE
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