A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system
A preliminary assessment of the impact of the ERS 1 scatterometer wind data on the current European Centre for Medium-Range Weather Forecasts analysis and forecast system has been carried out. Although the scatterometer data results in changes to the analyses and forecasts, there is no consistent im...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19930061897 2023-05-15T18:25:37+02:00 A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system Hoffman, Ross N. Unclassified, Unlimited, Publicly available June 15, 1993 http://ntrs.nasa.gov/search.jsp?R=19930061897 unknown http://ntrs.nasa.gov/search.jsp?R=19930061897 Accession ID: 93A45894 Copyright Other Sources 47 Journal of Geophysical Research; 98; C6; p. 10,233-10,244. 1993 ftnasantrs 2012-02-15T20:11:30Z A preliminary assessment of the impact of the ERS 1 scatterometer wind data on the current European Centre for Medium-Range Weather Forecasts analysis and forecast system has been carried out. Although the scatterometer data results in changes to the analyses and forecasts, there is no consistent improvement or degradation. Our results are based on comparing analyses and forecasts from assimilation cycles. The two sets of analyses are very similar except for the low level wind fields over the ocean. Impacts on the analyzed wind fields are greater over the southern ocean, where other data are scarce. For the most part the mass field increments are too small to balance the wind increments. The effect of the nonlinear normal mode initialization on the analysis differences is quite small, but we observe that the differences tend to wash out in the subsequent 6-hour forecast. In the Northern Hemisphere, analysis differences are very small, except directly at the scatterometer locations. Forecast comparisons reveal large differences in the Southern Hemisphere after 72 hours. Notable differences in the Northern Hemisphere do not appear until late in the forecast. Overall, however, the Southern Hemisphere impacts are neutral. The experiments described are preliminary in several respects. We expect these data to ultimately prove useful for global data assimilation. Other/Unknown Material Southern Ocean NASA Technical Reports Server (NTRS) Southern Ocean |
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NASA Technical Reports Server (NTRS) |
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47 Hoffman, Ross N. A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system |
topic_facet |
47 |
description |
A preliminary assessment of the impact of the ERS 1 scatterometer wind data on the current European Centre for Medium-Range Weather Forecasts analysis and forecast system has been carried out. Although the scatterometer data results in changes to the analyses and forecasts, there is no consistent improvement or degradation. Our results are based on comparing analyses and forecasts from assimilation cycles. The two sets of analyses are very similar except for the low level wind fields over the ocean. Impacts on the analyzed wind fields are greater over the southern ocean, where other data are scarce. For the most part the mass field increments are too small to balance the wind increments. The effect of the nonlinear normal mode initialization on the analysis differences is quite small, but we observe that the differences tend to wash out in the subsequent 6-hour forecast. In the Northern Hemisphere, analysis differences are very small, except directly at the scatterometer locations. Forecast comparisons reveal large differences in the Southern Hemisphere after 72 hours. Notable differences in the Northern Hemisphere do not appear until late in the forecast. Overall, however, the Southern Hemisphere impacts are neutral. The experiments described are preliminary in several respects. We expect these data to ultimately prove useful for global data assimilation. |
format |
Other/Unknown Material |
author |
Hoffman, Ross N. |
author_facet |
Hoffman, Ross N. |
author_sort |
Hoffman, Ross N. |
title |
A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system |
title_short |
A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system |
title_full |
A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system |
title_fullStr |
A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system |
title_full_unstemmed |
A preliminary study of the impact of the ERS 1 C band scatterometer wind data on the European Centre for Medium-Range Weather Forecasts global data assimilation system |
title_sort |
preliminary study of the impact of the ers 1 c band scatterometer wind data on the european centre for medium-range weather forecasts global data assimilation system |
publishDate |
1993 |
url |
http://ntrs.nasa.gov/search.jsp?R=19930061897 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19930061897 Accession ID: 93A45894 |
op_rights |
Copyright |
_version_ |
1766207195774451712 |