Retrievals of Atmospheric Temperature and Water Vapor in the Arctic
We show that by incorporating brightness temperature measurements at off-zenith angles, the accuracy of linear statistical retrievals of temperature and water vapor density profiles can be improved. This improvement is limited to clear sky cases where measurements at all angles represent the same at...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.176.3461 2023-05-15T15:05:21+02:00 Retrievals of Atmospheric Temperature and Water Vapor in the Arctic J. C. Liljegren M. P. Cadeddu The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.176.3461 http://www.arm.gov/publications/proceedings/conf16/extended_abs/liljegren_jc.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.176.3461 http://www.arm.gov/publications/proceedings/conf16/extended_abs/liljegren_jc.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.arm.gov/publications/proceedings/conf16/extended_abs/liljegren_jc.pdf text ftciteseerx 2016-01-07T16:14:52Z We show that by incorporating brightness temperature measurements at off-zenith angles, the accuracy of linear statistical retrievals of temperature and water vapor density profiles can be improved. This improvement is limited to clear sky cases where measurements at all angles represent the same atmospheric conditions. We present contribution functions to show how the off-zenith measurements affect the retrieval performance. We show that the brightness temperatures calculated using the MonoRTM and modified Rosenkranz models are affected by the choice of spectroscopic parameters for microwave absorption by oxygen, and how these choices affect the retrievals. We also show that by combining brightness temperature measurements near the 22.235-GHz water vapor line with measurements near the 183.31-GHz line into a physical retrieval, the accuracy of the retrieved water vapor density profile for very low water vapor conditions can be significantly improved. Background The Atmospheric Radiation Measurement (ARM) Program has operated a twelve-channel microwave radiometer profiler (MWRP) (Liljegren 2002) since February 2004 at ARM Climate Research Facility (ACRF) North Slope of Alaska (NSA) field site near Barrow, Alaska. The MWRP has five channels in Text Arctic Barrow north slope Alaska Unknown Arctic |
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ftciteseerx |
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English |
description |
We show that by incorporating brightness temperature measurements at off-zenith angles, the accuracy of linear statistical retrievals of temperature and water vapor density profiles can be improved. This improvement is limited to clear sky cases where measurements at all angles represent the same atmospheric conditions. We present contribution functions to show how the off-zenith measurements affect the retrieval performance. We show that the brightness temperatures calculated using the MonoRTM and modified Rosenkranz models are affected by the choice of spectroscopic parameters for microwave absorption by oxygen, and how these choices affect the retrievals. We also show that by combining brightness temperature measurements near the 22.235-GHz water vapor line with measurements near the 183.31-GHz line into a physical retrieval, the accuracy of the retrieved water vapor density profile for very low water vapor conditions can be significantly improved. Background The Atmospheric Radiation Measurement (ARM) Program has operated a twelve-channel microwave radiometer profiler (MWRP) (Liljegren 2002) since February 2004 at ARM Climate Research Facility (ACRF) North Slope of Alaska (NSA) field site near Barrow, Alaska. The MWRP has five channels in |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J. C. Liljegren M. P. Cadeddu |
spellingShingle |
J. C. Liljegren M. P. Cadeddu Retrievals of Atmospheric Temperature and Water Vapor in the Arctic |
author_facet |
J. C. Liljegren M. P. Cadeddu |
author_sort |
J. C. Liljegren |
title |
Retrievals of Atmospheric Temperature and Water Vapor in the Arctic |
title_short |
Retrievals of Atmospheric Temperature and Water Vapor in the Arctic |
title_full |
Retrievals of Atmospheric Temperature and Water Vapor in the Arctic |
title_fullStr |
Retrievals of Atmospheric Temperature and Water Vapor in the Arctic |
title_full_unstemmed |
Retrievals of Atmospheric Temperature and Water Vapor in the Arctic |
title_sort |
retrievals of atmospheric temperature and water vapor in the arctic |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.176.3461 http://www.arm.gov/publications/proceedings/conf16/extended_abs/liljegren_jc.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow north slope Alaska |
genre_facet |
Arctic Barrow north slope Alaska |
op_source |
http://www.arm.gov/publications/proceedings/conf16/extended_abs/liljegren_jc.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.176.3461 http://www.arm.gov/publications/proceedings/conf16/extended_abs/liljegren_jc.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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