A Three-Year Climatology of Cloud-Top Phase over the Southern Ocean and North PacificSource: Journal of Climate:;2011:;volume( 024 ):;issue: 009::page 2405DOI: 10.1175/2010JCLI3842.1Publisher: American Meteorological Society
Abstract: oderate Resolution Imaging Spectroradiometer (MODIS) Level 2 observations from the Terra satellite are used to create a 3-yr climatology of cloud-top phase over a section of the Southern Ocean (south of Australia) and the North Pacific Ocean. The intent is to highlight the extensive presence of supercooled liquid water over the Southern Ocean region, particularly during summer. The phase of such clouds directly affects the absorbed shortwave radiation, which has recently been found to be ?poorly simulated in both state-of-the-art reanalysis and coupled global climate models? (Trenberth and Fasullo).The climatology finds that supercooled liquid water is present year-round in the low-altitude clouds across this section of the Southern Ocean. Further, the MODIS cloud phase algorithm identifies very few glaciated cloud tops at temperatures above ?20°C, rather inferring a large portion of ?uncertain? cloud tops. Between 50° and 60°S during the summer, the albedo effect is compounded by a seasonal reduction in high-level cirrus. This is in direct contrast to the Bering Sea and Gulf of Alaska. Here MODIS finds a higher likelihood of observing warm liquid water clouds during summer and a reduction in the relative frequency of cloud tops within the 0° to ?20°C temperature range.As the MODIS cloud phase product has limited ability to confidently identify cloud-top phase between ?5° and ?25°C, future research should include observations from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and other space-based sensors to help with the classification within this temperature range. Further, multiregion in situ verification of any remotely sensed observations is vital to further understanding the cloud phase processes.
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contributor author | Morrison, Anthony E. | |
contributor author | Siems, Steven T. | |
contributor author | Manton, Michael J. | |
date accessioned | 2017-06-09T16:36:07Z | |
date available | 2017-06-09T16:36:07Z | |
date copyright | 2011/05/01 | |
date issued | 2011 | |
identifier issn | 0894-8755 | |
identifier other | ams-70740.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4212554 | |
description abstract | oderate Resolution Imaging Spectroradiometer (MODIS) Level 2 observations from the Terra satellite are used to create a 3-yr climatology of cloud-top phase over a section of the Southern Ocean (south of Australia) and the North Pacific Ocean. The intent is to highlight the extensive presence of supercooled liquid water over the Southern Ocean region, particularly during summer. The phase of such clouds directly affects the absorbed shortwave radiation, which has recently been found to be ?poorly simulated in both state-of-the-art reanalysis and coupled global climate models? (Trenberth and Fasullo).The climatology finds that supercooled liquid water is present year-round in the low-altitude clouds across this section of the Southern Ocean. Further, the MODIS cloud phase algorithm identifies very few glaciated cloud tops at temperatures above ?20°C, rather inferring a large portion of ?uncertain? cloud tops. Between 50° and 60°S during the summer, the albedo effect is compounded by a seasonal reduction in high-level cirrus. This is in direct contrast to the Bering Sea and Gulf of Alaska. Here MODIS finds a higher likelihood of observing warm liquid water clouds during summer and a reduction in the relative frequency of cloud tops within the 0° to ?20°C temperature range.As the MODIS cloud phase product has limited ability to confidently identify cloud-top phase between ?5° and ?25°C, future research should include observations from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and other space-based sensors to help with the classification within this temperature range. Further, multiregion in situ verification of any remotely sensed observations is vital to further understanding the cloud phase processes. | |
publisher | American Meteorological Society | |
title | A Three-Year Climatology of Cloud-Top Phase over the Southern Ocean and North Pacific | |
type | Journal Paper | |
journal volume | 24 | |
journal issue | 9 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/2010JCLI3842.1 | |
journal fristpage | 2405 | |
journal lastpage | 2418 | |
tree | Journal of Climate:;2011:;volume( 024 ):;issue: 009 | |
contenttype | Fulltext |