A method of cloud field detection over Antarctica during the polar night using AVHRR data
An improved algorithm for cloud field detection over the Antarctic region is presented. The algorithm is a combination of a conventional split window method and a spatial coherence method. The conventional split window method utilizes the brightness temperature and the brightness temperature differe...
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Scientific Note
2001
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ftnipr:oai:nipr.repo.nii.ac.jp:00002935 2023-05-15T13:49:00+02:00 A method of cloud field detection over Antarctica during the polar night using AVHRR data クジ マコト キクチ ノブユキ ヒラサワ ナオヒコ ヤマノウチ タカシ Makoto Kuji Nobuyuki Kikuchi Naohiko Hirasawa Takashi Yamanouchi 2001-11 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2935 http://id.nii.ac.jp/1291/00002935/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2935&item_no=1&attribute_id=18&file_no=1 en eng Scientific Note Department of Information and Computer Sciences, Nara Women's University Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2935 http://id.nii.ac.jp/1291/00002935/ AA1129795X Polar meteorology and glaciology, 15, 114-123(2001-11) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2935&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 2001 ftnipr 2022-11-26T19:42:17Z An improved algorithm for cloud field detection over the Antarctic region is presented. The algorithm is a combination of a conventional split window method and a spatial coherence method. The conventional split window method utilizes the brightness temperature and the brightness temperature difference between split window channels. The spatial coherence method makes use of the standard deviation of the brightness temperature difference between split window channels as an index of cloud field homogeneity. The algorithm, in principle, enables us to detect an inhomogeneous cloud field which has not been well detected with only the conventional split window method. This algorithm was applied to Advanced Very High Resolution Radiometer (AVHRR) data during the polar night over the Antarctic region. It is found that the improved algorithm seems to work well for an inhomogeneous cloud field as expected, although there still remains uncertainty related to the vertical structure of the cloud field. In order to investigate the vertical structure in detail, further analyses are needed such as comparison of the result to ground-based meteorological observation, radiative transfer simulation, and analysis of TIROS-N Operational Vertical Sounder (TOVS) data. Report Antarc* Antarctic Antarctica Polar meteorology and glaciology polar night National Institute of Polar Research Repository, Japan Antarctic The Antarctic |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
An improved algorithm for cloud field detection over the Antarctic region is presented. The algorithm is a combination of a conventional split window method and a spatial coherence method. The conventional split window method utilizes the brightness temperature and the brightness temperature difference between split window channels. The spatial coherence method makes use of the standard deviation of the brightness temperature difference between split window channels as an index of cloud field homogeneity. The algorithm, in principle, enables us to detect an inhomogeneous cloud field which has not been well detected with only the conventional split window method. This algorithm was applied to Advanced Very High Resolution Radiometer (AVHRR) data during the polar night over the Antarctic region. It is found that the improved algorithm seems to work well for an inhomogeneous cloud field as expected, although there still remains uncertainty related to the vertical structure of the cloud field. In order to investigate the vertical structure in detail, further analyses are needed such as comparison of the result to ground-based meteorological observation, radiative transfer simulation, and analysis of TIROS-N Operational Vertical Sounder (TOVS) data. |
format |
Report |
author |
クジ マコト キクチ ノブユキ ヒラサワ ナオヒコ ヤマノウチ タカシ Makoto Kuji Nobuyuki Kikuchi Naohiko Hirasawa Takashi Yamanouchi |
spellingShingle |
クジ マコト キクチ ノブユキ ヒラサワ ナオヒコ ヤマノウチ タカシ Makoto Kuji Nobuyuki Kikuchi Naohiko Hirasawa Takashi Yamanouchi A method of cloud field detection over Antarctica during the polar night using AVHRR data |
author_facet |
クジ マコト キクチ ノブユキ ヒラサワ ナオヒコ ヤマノウチ タカシ Makoto Kuji Nobuyuki Kikuchi Naohiko Hirasawa Takashi Yamanouchi |
author_sort |
クジ マコト |
title |
A method of cloud field detection over Antarctica during the polar night using AVHRR data |
title_short |
A method of cloud field detection over Antarctica during the polar night using AVHRR data |
title_full |
A method of cloud field detection over Antarctica during the polar night using AVHRR data |
title_fullStr |
A method of cloud field detection over Antarctica during the polar night using AVHRR data |
title_full_unstemmed |
A method of cloud field detection over Antarctica during the polar night using AVHRR data |
title_sort |
method of cloud field detection over antarctica during the polar night using avhrr data |
publisher |
Scientific Note |
publishDate |
2001 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2935 http://id.nii.ac.jp/1291/00002935/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2935&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Polar meteorology and glaciology polar night |
genre_facet |
Antarc* Antarctic Antarctica Polar meteorology and glaciology polar night |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2935 http://id.nii.ac.jp/1291/00002935/ AA1129795X Polar meteorology and glaciology, 15, 114-123(2001-11) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2935&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250327639588864 |