Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products
Radiation field and cloud properties over the Southern Ocean area generated by the Australian Community Climate and Earth System Simulator (ACCESS) are evaluated using multiple‐satellite products from the Fast Longwave And Shortwave radiative Fluxes (FLASHFlux) project and NASA/GEWEX surface radiati...
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crwiley:10.1002/qj.2641 2024-09-09T20:09:41+00:00 Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products Luo, San Sun, Zhian Zheng, Xiaogu Rikus, Lawrie Franklin, Charmaine National Program on Key Basic Research Projects of China 2015 http://dx.doi.org/10.1002/qj.2641 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.2641 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.2641 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 142, issue 694, page 160-171 ISSN 0035-9009 1477-870X journal-article 2015 crwiley https://doi.org/10.1002/qj.2641 2024-06-18T04:16:30Z Radiation field and cloud properties over the Southern Ocean area generated by the Australian Community Climate and Earth System Simulator (ACCESS) are evaluated using multiple‐satellite products from the Fast Longwave And Shortwave radiative Fluxes (FLASHFlux) project and NASA/GEWEX surface radiation budget (SRB) data. The cloud properties are also evaluated using the observational simulator package COSP, a synthetic brightness temperature model (SBTM) and cloud liquid‐water path data (UWisc) from the University of Wisconsin satellite retrievals. All of these evaluations are focused on the Southern Ocean area in an effort to understand the reasons behind the short‐wave radiation biases at the surface. It is found that the model overestimates the high‐level cloud fraction and frequency of occurrence of small ice‐water content and underestimates the middle and low‐level cloud fraction and water content. In order to improve the modelled radiation fields over the Southern Ocean area, two main modifications have been made to the physical schemes in the ACCESS model. Firstly the autoconversion rate at which the cloud water is converted into rain and the accretion rate in the warm rain scheme have been modified, which increases the cloud liquid‐water content in warm cloud layers. Secondly, the scheme which determines the fraction of supercooled liquid water in mixed‐phase clouds in the parametrization of cloud optical properties has been changed to use one derived from CALIPSO data which provides larger liquid cloud fractions and thus higher optical depths than the default scheme. Sensitivity tests of these two schemes in ACCESS climate runs have shown that applying either can lead to a reduction of the solar radiation reaching the surface and reduce the short‐wave radiation biases. Article in Journal/Newspaper Southern Ocean Wiley Online Library Southern Ocean Quarterly Journal of the Royal Meteorological Society 142 694 160 171 |
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Wiley Online Library |
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English |
description |
Radiation field and cloud properties over the Southern Ocean area generated by the Australian Community Climate and Earth System Simulator (ACCESS) are evaluated using multiple‐satellite products from the Fast Longwave And Shortwave radiative Fluxes (FLASHFlux) project and NASA/GEWEX surface radiation budget (SRB) data. The cloud properties are also evaluated using the observational simulator package COSP, a synthetic brightness temperature model (SBTM) and cloud liquid‐water path data (UWisc) from the University of Wisconsin satellite retrievals. All of these evaluations are focused on the Southern Ocean area in an effort to understand the reasons behind the short‐wave radiation biases at the surface. It is found that the model overestimates the high‐level cloud fraction and frequency of occurrence of small ice‐water content and underestimates the middle and low‐level cloud fraction and water content. In order to improve the modelled radiation fields over the Southern Ocean area, two main modifications have been made to the physical schemes in the ACCESS model. Firstly the autoconversion rate at which the cloud water is converted into rain and the accretion rate in the warm rain scheme have been modified, which increases the cloud liquid‐water content in warm cloud layers. Secondly, the scheme which determines the fraction of supercooled liquid water in mixed‐phase clouds in the parametrization of cloud optical properties has been changed to use one derived from CALIPSO data which provides larger liquid cloud fractions and thus higher optical depths than the default scheme. Sensitivity tests of these two schemes in ACCESS climate runs have shown that applying either can lead to a reduction of the solar radiation reaching the surface and reduce the short‐wave radiation biases. |
author2 |
National Program on Key Basic Research Projects of China |
format |
Article in Journal/Newspaper |
author |
Luo, San Sun, Zhian Zheng, Xiaogu Rikus, Lawrie Franklin, Charmaine |
spellingShingle |
Luo, San Sun, Zhian Zheng, Xiaogu Rikus, Lawrie Franklin, Charmaine Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products |
author_facet |
Luo, San Sun, Zhian Zheng, Xiaogu Rikus, Lawrie Franklin, Charmaine |
author_sort |
Luo, San |
title |
Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products |
title_short |
Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products |
title_full |
Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products |
title_fullStr |
Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products |
title_full_unstemmed |
Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products |
title_sort |
evaluation of access model cloud properties over the southern ocean area using multiple‐satellite products |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1002/qj.2641 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.2641 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.2641 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 142, issue 694, page 160-171 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.2641 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
142 |
container_issue |
694 |
container_start_page |
160 |
op_container_end_page |
171 |
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1809943919699427328 |