Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model
The sensitivity of assimilating sea ice thickness data to uncertainty in atmospheric forcing fields is examined using ensemble-based data assimilation experiments with the Massachusetts Institute of Technology General Circulation Model (MITgcm) in the Arctic Ocean during November 2011–January 2012 a...
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ftawi:oai:epic.awi.de:42206 2024-09-15T17:53:57+00:00 Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model Yang, Qinghua Losch, Martin Losa, Svetlana N. Jung, Thomas Nerger, Lars 2016 application/pdf https://epic.awi.de/id/eprint/42206/ https://epic.awi.de/id/eprint/42206/1/Yang_etal_JAOT33_397_2016.pdf https://hdl.handle.net/10013/epic.48939 https://hdl.handle.net/10013/epic.48939.d001 unknown https://epic.awi.de/id/eprint/42206/1/Yang_etal_JAOT33_397_2016.pdf https://hdl.handle.net/10013/epic.48939.d001 Yang, Q. , Losch, M. orcid:0000-0002-3824-5244 , Losa, S. N. orcid:0000-0003-2153-1954 , Jung, T. orcid:0000-0002-2651-1293 and Nerger, L. orcid:0000-0002-1908-1010 (2016) Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model , Journal of Atmospheric and Oceanic Technology, 33 , pp. 397-407 . doi:10.1175/JTECH-D-15-0176.1 <https://doi.org/10.1175/JTECH-D-15-0176.1> , hdl:10013/epic.48939 EPIC3Journal of Atmospheric and Oceanic Technology, 33, pp. 397-407 Article isiRev 2016 ftawi https://doi.org/10.1175/JTECH-D-15-0176.1 2024-06-24T04:15:36Z The sensitivity of assimilating sea ice thickness data to uncertainty in atmospheric forcing fields is examined using ensemble-based data assimilation experiments with the Massachusetts Institute of Technology General Circulation Model (MITgcm) in the Arctic Ocean during November 2011–January 2012 and the Met Office (UKMO) ensemble atmospheric forecasts. The assimilation system is based on a local singular evolutive interpolated Kalman (LSEIK) filter. It combines sea ice thickness data derived from the European Space Agency’s (ESA) Soil Moisture Ocean Salinity (SMOS) satellite and Special Sensor Microwave Imager/Sounder (SSMIS) sea ice concentration data with the numerical model. The effect of representing atmospheric uncertainty implicit in the ensemble forcing is assessed by three different assimilation experiments. The first two experiments use a single deterministic forcing dataset and a different forgetting factor to inflate the ensemble spread. The third experiment uses 23 members of the UKMO atmospheric ensemble prediction system. It avoids additional ensemble inflation and is hence easier to implement. As expected, the model-data misfits are substantially reduced in all three experiments, but with the ensemble forcing the errors in the forecasts of sea ice concentration and thickness are smaller compared to the experiments with deterministic forcing. This is most likely because the ensemble forcing results in a more plausible spread of the model state ensemble, which represents model uncertainty and produces a better forecast. Article in Journal/Newspaper Arctic Ocean Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Atmospheric and Oceanic Technology 33 3 397 407 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The sensitivity of assimilating sea ice thickness data to uncertainty in atmospheric forcing fields is examined using ensemble-based data assimilation experiments with the Massachusetts Institute of Technology General Circulation Model (MITgcm) in the Arctic Ocean during November 2011–January 2012 and the Met Office (UKMO) ensemble atmospheric forecasts. The assimilation system is based on a local singular evolutive interpolated Kalman (LSEIK) filter. It combines sea ice thickness data derived from the European Space Agency’s (ESA) Soil Moisture Ocean Salinity (SMOS) satellite and Special Sensor Microwave Imager/Sounder (SSMIS) sea ice concentration data with the numerical model. The effect of representing atmospheric uncertainty implicit in the ensemble forcing is assessed by three different assimilation experiments. The first two experiments use a single deterministic forcing dataset and a different forgetting factor to inflate the ensemble spread. The third experiment uses 23 members of the UKMO atmospheric ensemble prediction system. It avoids additional ensemble inflation and is hence easier to implement. As expected, the model-data misfits are substantially reduced in all three experiments, but with the ensemble forcing the errors in the forecasts of sea ice concentration and thickness are smaller compared to the experiments with deterministic forcing. This is most likely because the ensemble forcing results in a more plausible spread of the model state ensemble, which represents model uncertainty and produces a better forecast. |
format |
Article in Journal/Newspaper |
author |
Yang, Qinghua Losch, Martin Losa, Svetlana N. Jung, Thomas Nerger, Lars |
spellingShingle |
Yang, Qinghua Losch, Martin Losa, Svetlana N. Jung, Thomas Nerger, Lars Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model |
author_facet |
Yang, Qinghua Losch, Martin Losa, Svetlana N. Jung, Thomas Nerger, Lars |
author_sort |
Yang, Qinghua |
title |
Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model |
title_short |
Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model |
title_full |
Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model |
title_fullStr |
Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model |
title_full_unstemmed |
Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model |
title_sort |
taking into account atmospheric uncertainty improves sequential assimilation of smos sea ice thickness data in an ice-ocean model |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/42206/ https://epic.awi.de/id/eprint/42206/1/Yang_etal_JAOT33_397_2016.pdf https://hdl.handle.net/10013/epic.48939 https://hdl.handle.net/10013/epic.48939.d001 |
genre |
Arctic Ocean Sea ice |
genre_facet |
Arctic Ocean Sea ice |
op_source |
EPIC3Journal of Atmospheric and Oceanic Technology, 33, pp. 397-407 |
op_relation |
https://epic.awi.de/id/eprint/42206/1/Yang_etal_JAOT33_397_2016.pdf https://hdl.handle.net/10013/epic.48939.d001 Yang, Q. , Losch, M. orcid:0000-0002-3824-5244 , Losa, S. N. orcid:0000-0003-2153-1954 , Jung, T. orcid:0000-0002-2651-1293 and Nerger, L. orcid:0000-0002-1908-1010 (2016) Taking into account atmospheric uncertainty improves sequential assimilation of SMOS sea ice thickness data in an ice-ocean model , Journal of Atmospheric and Oceanic Technology, 33 , pp. 397-407 . doi:10.1175/JTECH-D-15-0176.1 <https://doi.org/10.1175/JTECH-D-15-0176.1> , hdl:10013/epic.48939 |
op_doi |
https://doi.org/10.1175/JTECH-D-15-0176.1 |
container_title |
Journal of Atmospheric and Oceanic Technology |
container_volume |
33 |
container_issue |
3 |
container_start_page |
397 |
op_container_end_page |
407 |
_version_ |
1810430087213875200 |