Impact of profile observations on the German Weather Service's NWP system
In preparation for a study on the potential impact of a space-borne Doppler wind lidar on the quality of NWP products, a series of assimilations and forecasts were conducted to estimate the potential benefit of conventional wind and temperature profile measurements over North America to numerical we...
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ftdoajarticles:oai:doaj.org/article:6dd10a6d595648039945cd6bc33896aa 2023-05-15T16:35:32+02:00 Impact of profile observations on the German Weather Service's NWP system Alexander Cress Werner Wergen 2001-04-01T00:00:00Z https://doi.org/10.1127/0941-2948/2001/0010-0091 https://doaj.org/article/6dd10a6d595648039945cd6bc33896aa EN eng Borntraeger http://dx.doi.org/10.1127/0941-2948/2001/0010-0091 https://doaj.org/toc/0941-2948 0941-2948 doi:10.1127/0941-2948/2001/0010-0091 https://doaj.org/article/6dd10a6d595648039945cd6bc33896aa Meteorologische Zeitschrift, Vol 10, Iss 2, Pp 91-101 (2001) Meteorology. Climatology QC851-999 article 2001 ftdoajarticles https://doi.org/10.1127/0941-2948/2001/0010-0091 2022-12-31T16:30:56Z In preparation for a study on the potential impact of a space-borne Doppler wind lidar on the quality of NWP products, a series of assimilations and forecasts were conducted to estimate the potential benefit of conventional wind and temperature profile measurements over North America to numerical weather forecasts for the Northern Hemisphere and specifically, Europe. A comparison of the forecast quality of a control run, using all available observations, to experiments omitting wind and temperature data from specific instruments (radiosondes, pilot stations and aircraft) makes it possible to estimate the importance of the omitted data, and clarify whether winds derived from the geostrophic relation are sufficient or whether observed wind profiles result in a more realistic definition of the initial state for numerical weather prediction systems in the extra-tropic regions. Very little impact on forecast quality was noted when wind or temperature observations from radiosondes and pilots were excluded from the assimilation process. However, a clear deterioration in forecast quality was observed when additionally all available wind or temperature measurements from aircraft were also withheld. Comparisons of the relative utility of wind and temperature observations over North America show that assimilations and forecasts derive more benefit from wind data than from temperature data. The greatest deterioration could be observed if both wind and temperature observations were omitted from the assimilation cycle. By tracing the differences between the control forecasts and the experimental forecasts to their initial difference, the regions around Hudson Bay, Novia Scotia, Buffin Bay and Northern Canada could be identified as sensitive areas, i.e. those where a missing observation could have a substantial effect on the forecast for the Northern Hemisphere and Europe. Comparisons of the relative utility of radiosonde wind and temperature observations over Canada and Alaska to numerical weather forecast quality, in ... Article in Journal/Newspaper Hudson Bay Alaska Directory of Open Access Journals: DOAJ Articles Hudson Bay Canada Hudson Meteorologische Zeitschrift 10 2 91 101 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Meteorology. Climatology QC851-999 |
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Meteorology. Climatology QC851-999 Alexander Cress Werner Wergen Impact of profile observations on the German Weather Service's NWP system |
topic_facet |
Meteorology. Climatology QC851-999 |
description |
In preparation for a study on the potential impact of a space-borne Doppler wind lidar on the quality of NWP products, a series of assimilations and forecasts were conducted to estimate the potential benefit of conventional wind and temperature profile measurements over North America to numerical weather forecasts for the Northern Hemisphere and specifically, Europe. A comparison of the forecast quality of a control run, using all available observations, to experiments omitting wind and temperature data from specific instruments (radiosondes, pilot stations and aircraft) makes it possible to estimate the importance of the omitted data, and clarify whether winds derived from the geostrophic relation are sufficient or whether observed wind profiles result in a more realistic definition of the initial state for numerical weather prediction systems in the extra-tropic regions. Very little impact on forecast quality was noted when wind or temperature observations from radiosondes and pilots were excluded from the assimilation process. However, a clear deterioration in forecast quality was observed when additionally all available wind or temperature measurements from aircraft were also withheld. Comparisons of the relative utility of wind and temperature observations over North America show that assimilations and forecasts derive more benefit from wind data than from temperature data. The greatest deterioration could be observed if both wind and temperature observations were omitted from the assimilation cycle. By tracing the differences between the control forecasts and the experimental forecasts to their initial difference, the regions around Hudson Bay, Novia Scotia, Buffin Bay and Northern Canada could be identified as sensitive areas, i.e. those where a missing observation could have a substantial effect on the forecast for the Northern Hemisphere and Europe. Comparisons of the relative utility of radiosonde wind and temperature observations over Canada and Alaska to numerical weather forecast quality, in ... |
format |
Article in Journal/Newspaper |
author |
Alexander Cress Werner Wergen |
author_facet |
Alexander Cress Werner Wergen |
author_sort |
Alexander Cress |
title |
Impact of profile observations on the German Weather Service's NWP system |
title_short |
Impact of profile observations on the German Weather Service's NWP system |
title_full |
Impact of profile observations on the German Weather Service's NWP system |
title_fullStr |
Impact of profile observations on the German Weather Service's NWP system |
title_full_unstemmed |
Impact of profile observations on the German Weather Service's NWP system |
title_sort |
impact of profile observations on the german weather service's nwp system |
publisher |
Borntraeger |
publishDate |
2001 |
url |
https://doi.org/10.1127/0941-2948/2001/0010-0091 https://doaj.org/article/6dd10a6d595648039945cd6bc33896aa |
geographic |
Hudson Bay Canada Hudson |
geographic_facet |
Hudson Bay Canada Hudson |
genre |
Hudson Bay Alaska |
genre_facet |
Hudson Bay Alaska |
op_source |
Meteorologische Zeitschrift, Vol 10, Iss 2, Pp 91-101 (2001) |
op_relation |
http://dx.doi.org/10.1127/0941-2948/2001/0010-0091 https://doaj.org/toc/0941-2948 0941-2948 doi:10.1127/0941-2948/2001/0010-0091 https://doaj.org/article/6dd10a6d595648039945cd6bc33896aa |
op_doi |
https://doi.org/10.1127/0941-2948/2001/0010-0091 |
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Meteorologische Zeitschrift |
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10 |
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2 |
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101 |
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