A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nm
Clouds act as a major reflector that changes the amount of sunlight reflected to space. Change in radiance intensity due to the presence of clouds interrupts the retrieval of trace gas or aerosol properties from satellite data. In this paper, we developed a fast and robust algorithm, named the fast...
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doaj-eb66873e02724d49bac8b5fa77194bbd2021-01-06T00:03:03ZengMDPI AGRemote Sensing2072-42922021-01-011315215210.3390/rs13010152A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nmHaklim Choi0Xiong Liu1Gonzalo Gonzalez Abad2Jongjin Seo3Kwang-Mog Lee4Jhoon Kim5Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 41566, KoreaHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USADepartment of Astronomy and Atmospheric Sciences, University of Wisconsin, Madison, WI 53706, USADepartment of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 41566, KoreaDepartment of Atmospheric Sciences, Yonsei University, Seoul 03722, KoreaClouds act as a major reflector that changes the amount of sunlight reflected to space. Change in radiance intensity due to the presence of clouds interrupts the retrieval of trace gas or aerosol properties from satellite data. In this paper, we developed a fast and robust algorithm, named the fast cloud retrieval algorithm, using a triplet of wavelengths (469, 477, and 485 nm) of the O<sub>2</sub>–O<sub>2</sub> absorption band around 477 nm (CLDTO4) to derive the cloud information such as cloud top pressure (CTP) and cloud fraction (CF) for the Geostationary Environment Monitoring Spectrometer (GEMS). The novel algorithm is based on the fact that the difference in the optical path through which light passes with regard to the altitude of clouds causes a change in radiance due to the absorption of O<sub>2</sub>–O<sub>2</sub> at the three selected wavelengths. To reduce the time required for algorithm calculations, the look-up table (LUT) method was applied. The LUT was pre-constructed for various conditions of geometry using Vectorized Linearized Discrete Ordinate Radiative Transfer (VLIDORT) to consider the polarization of the scattered light. The GEMS was launched in February 2020, but the observed data of GEMS have not yet been widely released. To evaluate the performance of the algorithm, the retrieved CTP and CF using observational data from the Global Ozone Monitoring Experiment-2 (GOME-2), which cover the spectral range of GEMS, were compared with the results of the Fast Retrieval Scheme for Clouds from the Oxygen A band (FRESCO) algorithm, which is based on the O<sub>2</sub> A-band. There was good agreement between the results, despite small discrepancies for low clouds.https://www.mdpi.com/2072-4292/13/1/152fast retrievalcloud top pressurecloud fractionoxygen dimerGEMSFRESCO |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Haklim Choi Xiong Liu Gonzalo Gonzalez Abad Jongjin Seo Kwang-Mog Lee Jhoon Kim |
spellingShingle |
Haklim Choi Xiong Liu Gonzalo Gonzalez Abad Jongjin Seo Kwang-Mog Lee Jhoon Kim A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nm Remote Sensing fast retrieval cloud top pressure cloud fraction oxygen dimer GEMS FRESCO |
author_facet |
Haklim Choi Xiong Liu Gonzalo Gonzalez Abad Jongjin Seo Kwang-Mog Lee Jhoon Kim |
author_sort |
Haklim Choi |
title |
A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nm |
title_short |
A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nm |
title_full |
A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nm |
title_fullStr |
A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nm |
title_full_unstemmed |
A Fast Retrieval of Cloud Parameters Using a Triplet of WaveLengths of Oxygen Dimer Band around 477 nm |
title_sort |
fast retrieval of cloud parameters using a triplet of wavelengths of oxygen dimer band around 477 nm |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2021-01-01 |
description |
Clouds act as a major reflector that changes the amount of sunlight reflected to space. Change in radiance intensity due to the presence of clouds interrupts the retrieval of trace gas or aerosol properties from satellite data. In this paper, we developed a fast and robust algorithm, named the fast cloud retrieval algorithm, using a triplet of wavelengths (469, 477, and 485 nm) of the O<sub>2</sub>–O<sub>2</sub> absorption band around 477 nm (CLDTO4) to derive the cloud information such as cloud top pressure (CTP) and cloud fraction (CF) for the Geostationary Environment Monitoring Spectrometer (GEMS). The novel algorithm is based on the fact that the difference in the optical path through which light passes with regard to the altitude of clouds causes a change in radiance due to the absorption of O<sub>2</sub>–O<sub>2</sub> at the three selected wavelengths. To reduce the time required for algorithm calculations, the look-up table (LUT) method was applied. The LUT was pre-constructed for various conditions of geometry using Vectorized Linearized Discrete Ordinate Radiative Transfer (VLIDORT) to consider the polarization of the scattered light. The GEMS was launched in February 2020, but the observed data of GEMS have not yet been widely released. To evaluate the performance of the algorithm, the retrieved CTP and CF using observational data from the Global Ozone Monitoring Experiment-2 (GOME-2), which cover the spectral range of GEMS, were compared with the results of the Fast Retrieval Scheme for Clouds from the Oxygen A band (FRESCO) algorithm, which is based on the O<sub>2</sub> A-band. There was good agreement between the results, despite small discrepancies for low clouds. |
topic |
fast retrieval cloud top pressure cloud fraction oxygen dimer GEMS FRESCO |
url |
https://www.mdpi.com/2072-4292/13/1/152 |
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