Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I
Abstract A problem in mapping the polar sea-ice covers in both hemispheres has been the sporadic false indication of sea ice over the open ocean and at the ice edge. These spurious sea-ice concentrations result from variations in sea-surface roughening by surface winds, atmospheric water vapor and b...
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Cambridge University Press (CUP)
1995
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crcambridgeupr:10.1017/s0022143000034791 2024-06-23T07:54:15+00:00 Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I Cavalieri, Donald J. St. Germain, Karen M. Swift, Calvin T. 1995 http://dx.doi.org/10.1017/s0022143000034791 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000034791 en eng Cambridge University Press (CUP) Journal of Glaciology volume 41, issue 139, page 455-464 ISSN 0022-1430 1727-5652 journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0022143000034791 2024-06-12T04:04:36Z Abstract A problem in mapping the polar sea-ice covers in both hemispheres has been the sporadic false indication of sea ice over the open ocean and at the ice edge. These spurious sea-ice concentrations result from variations in sea-surface roughening by surface winds, atmospheric water vapor and both precipitating and non-precipitating liquid water. This problem was addressed for sea-ice concentrations derived from the Nimbus-7 scanning multi-channel microwave radiometer (SMMR) data through the development of a weather filter based on spectral information from the 18.0 and 37.0 GHz vertical polarization SMMR channels. Application of a similar filter for use with sea-ice concentration maps derived with the special-sensor microwave imager (SSM/I) sensor is less successful. This results from the position of the 19.35 GHz SSM/I channels, which are closer to the center of the 22.2 GHz atmospheric water-vapor line than are the SMMR 18.0 GHz channels. Thus, the SSM/I 19.35 GHz channels are more sensitive to changes in atmospheric water vapor, which results in greater contamination problems. An additional filter has been developed, based on a combination of the 19.35 and 22.2GHz. SSM/I channels. Examples of the effectiveness of the new filter are presented and limitations are discussed. Article in Journal/Newspaper Journal of Glaciology Sea ice Cambridge University Press Journal of Glaciology 41 139 455 464 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract A problem in mapping the polar sea-ice covers in both hemispheres has been the sporadic false indication of sea ice over the open ocean and at the ice edge. These spurious sea-ice concentrations result from variations in sea-surface roughening by surface winds, atmospheric water vapor and both precipitating and non-precipitating liquid water. This problem was addressed for sea-ice concentrations derived from the Nimbus-7 scanning multi-channel microwave radiometer (SMMR) data through the development of a weather filter based on spectral information from the 18.0 and 37.0 GHz vertical polarization SMMR channels. Application of a similar filter for use with sea-ice concentration maps derived with the special-sensor microwave imager (SSM/I) sensor is less successful. This results from the position of the 19.35 GHz SSM/I channels, which are closer to the center of the 22.2 GHz atmospheric water-vapor line than are the SMMR 18.0 GHz channels. Thus, the SSM/I 19.35 GHz channels are more sensitive to changes in atmospheric water vapor, which results in greater contamination problems. An additional filter has been developed, based on a combination of the 19.35 and 22.2GHz. SSM/I channels. Examples of the effectiveness of the new filter are presented and limitations are discussed. |
format |
Article in Journal/Newspaper |
author |
Cavalieri, Donald J. St. Germain, Karen M. Swift, Calvin T. |
spellingShingle |
Cavalieri, Donald J. St. Germain, Karen M. Swift, Calvin T. Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I |
author_facet |
Cavalieri, Donald J. St. Germain, Karen M. Swift, Calvin T. |
author_sort |
Cavalieri, Donald J. |
title |
Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I |
title_short |
Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I |
title_full |
Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I |
title_fullStr |
Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I |
title_full_unstemmed |
Reduction of weather effects in the calculation of sea-ice concentration with the DMSP SSM/I |
title_sort |
reduction of weather effects in the calculation of sea-ice concentration with the dmsp ssm/i |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0022143000034791 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000034791 |
genre |
Journal of Glaciology Sea ice |
genre_facet |
Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology volume 41, issue 139, page 455-464 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000034791 |
container_title |
Journal of Glaciology |
container_volume |
41 |
container_issue |
139 |
container_start_page |
455 |
op_container_end_page |
464 |
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1802646342093242368 |