Optimal Observations for Variational Data Assimilation
An important aspect of Ocean state estimation is the design of an observing system that allows the efficient study of climate aspects in the ocean. A solution of the design problem is presented here in terms of optimal observations that emerge as nondimensionalized singular vectors of the modified d...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20030091495 2023-05-15T16:29:20+02:00 Optimal Observations for Variational Data Assimilation Stammer, Detlef Koehl, Armin Unclassified, Unlimited, Publicly available September 24, 2003 application/pdf http://hdl.handle.net/2060/20030091495 unknown Document ID: 20030091495 http://hdl.handle.net/2060/20030091495 No Copyright CASI Oceanography 2003 ftnasantrs 2019-07-21T07:45:14Z An important aspect of Ocean state estimation is the design of an observing system that allows the efficient study of climate aspects in the ocean. A solution of the design problem is presented here in terms of optimal observations that emerge as nondimensionalized singular vectors of the modified data resolution matrix. The actual computation is feasible only for scalar quantities in the limit of large observational errors. In the framework of a lo resolution North Atlantic primitive equation model it is demonstrated that such optimal observations when applied to determining the strength of the volume and heat transport across the Greenland-Scotland ridge, perform significantly better than traditional section data. On seasonal to inter-annual time-scales optimal observations are located primarily along the continental shelf and information about heat-transport, wind stress and stratification is being communicated via boundary waves and advective processes. On time-scales of about a month, sea surface height observations appear to be more efficient in reconstructing the cross-ridge heat transport than hydrographic observations. Optimal observations also provide a tool for understanding how the ocean state is effected by anomalies of integral quantities such as meridional heat transport. Other/Unknown Material Greenland Greenland-Scotland Ridge North Atlantic NASA Technical Reports Server (NTRS) Greenland |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Oceanography |
spellingShingle |
Oceanography Stammer, Detlef Koehl, Armin Optimal Observations for Variational Data Assimilation |
topic_facet |
Oceanography |
description |
An important aspect of Ocean state estimation is the design of an observing system that allows the efficient study of climate aspects in the ocean. A solution of the design problem is presented here in terms of optimal observations that emerge as nondimensionalized singular vectors of the modified data resolution matrix. The actual computation is feasible only for scalar quantities in the limit of large observational errors. In the framework of a lo resolution North Atlantic primitive equation model it is demonstrated that such optimal observations when applied to determining the strength of the volume and heat transport across the Greenland-Scotland ridge, perform significantly better than traditional section data. On seasonal to inter-annual time-scales optimal observations are located primarily along the continental shelf and information about heat-transport, wind stress and stratification is being communicated via boundary waves and advective processes. On time-scales of about a month, sea surface height observations appear to be more efficient in reconstructing the cross-ridge heat transport than hydrographic observations. Optimal observations also provide a tool for understanding how the ocean state is effected by anomalies of integral quantities such as meridional heat transport. |
author |
Stammer, Detlef Koehl, Armin |
author_facet |
Stammer, Detlef Koehl, Armin |
author_sort |
Stammer, Detlef |
title |
Optimal Observations for Variational Data Assimilation |
title_short |
Optimal Observations for Variational Data Assimilation |
title_full |
Optimal Observations for Variational Data Assimilation |
title_fullStr |
Optimal Observations for Variational Data Assimilation |
title_full_unstemmed |
Optimal Observations for Variational Data Assimilation |
title_sort |
optimal observations for variational data assimilation |
publishDate |
2003 |
url |
http://hdl.handle.net/2060/20030091495 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland-Scotland Ridge North Atlantic |
genre_facet |
Greenland Greenland-Scotland Ridge North Atlantic |
op_source |
CASI |
op_relation |
Document ID: 20030091495 http://hdl.handle.net/2060/20030091495 |
op_rights |
No Copyright |
_version_ |
1766019037053059072 |