Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes
We present a methodology to correct precipitation fluxes from the ECMWF atmospheric reanalysis (ERA-Interim) for oceanographic applications. The correction is performed by means of a spatially varying monthly climatological coefficient, computed within the period 1989–2008 by comparison between ERA-...
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ftcopernicus:oai:publications.copernicus.org:osd14345 2023-05-15T13:36:36+02:00 Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes Storto, A. Russo, I. Masina, S. 2018-08-10 application/pdf https://doi.org/10.5194/osd-9-611-2012 https://os.copernicus.org/preprints/os-2012-16/ eng eng doi:10.5194/osd-9-611-2012 https://os.copernicus.org/preprints/os-2012-16/ eISSN: 1812-0792 Text 2018 ftcopernicus https://doi.org/10.5194/osd-9-611-2012 2020-07-20T16:25:54Z We present a methodology to correct precipitation fluxes from the ECMWF atmospheric reanalysis (ERA-Interim) for oceanographic applications. The correction is performed by means of a spatially varying monthly climatological coefficient, computed within the period 1989–2008 by comparison between ERA-Interim and a satellite-based passive microwave precipitation product. ERA-Interim exhibits a systematic over-estimation of precipitation within the inter-tropical convergence zones (up to 3 mm d −1 ) and under-estimation at mid- and high- latitudes (up to −4 mm d −1 ). The correction has been validated within eddy-permitting resolution global ocean hindcasts (1989–2009), demonstrating the ability of our strategy in attenuating the 20-yr mean global EMP negative imbalance by 16%, reducing the near-surface salinity fresh bias in the Tropics up to 1 psu and improving the representation of the sea level interannual variability, with an SSH error decrease of 8%. The ocean circulation is also proved to benefit from the correction, especially in correspondence of the Antarctic Circumpolar Current, where the error in the near-surface current speed decreases by a 9%. Finally, we show that the correction leads to volume and freshwater transports that better agree with independent estimates. Text Antarc* Antarctic Copernicus Publications: E-Journals Antarctic The Antarctic |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
We present a methodology to correct precipitation fluxes from the ECMWF atmospheric reanalysis (ERA-Interim) for oceanographic applications. The correction is performed by means of a spatially varying monthly climatological coefficient, computed within the period 1989–2008 by comparison between ERA-Interim and a satellite-based passive microwave precipitation product. ERA-Interim exhibits a systematic over-estimation of precipitation within the inter-tropical convergence zones (up to 3 mm d −1 ) and under-estimation at mid- and high- latitudes (up to −4 mm d −1 ). The correction has been validated within eddy-permitting resolution global ocean hindcasts (1989–2009), demonstrating the ability of our strategy in attenuating the 20-yr mean global EMP negative imbalance by 16%, reducing the near-surface salinity fresh bias in the Tropics up to 1 psu and improving the representation of the sea level interannual variability, with an SSH error decrease of 8%. The ocean circulation is also proved to benefit from the correction, especially in correspondence of the Antarctic Circumpolar Current, where the error in the near-surface current speed decreases by a 9%. Finally, we show that the correction leads to volume and freshwater transports that better agree with independent estimates. |
format |
Text |
author |
Storto, A. Russo, I. Masina, S. |
spellingShingle |
Storto, A. Russo, I. Masina, S. Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes |
author_facet |
Storto, A. Russo, I. Masina, S. |
author_sort |
Storto, A. |
title |
Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes |
title_short |
Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes |
title_full |
Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes |
title_fullStr |
Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes |
title_full_unstemmed |
Interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes |
title_sort |
interannual response of global ocean hindcasts to a satellite-based correction of precipitation fluxes |
publishDate |
2018 |
url |
https://doi.org/10.5194/osd-9-611-2012 https://os.copernicus.org/preprints/os-2012-16/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
eISSN: 1812-0792 |
op_relation |
doi:10.5194/osd-9-611-2012 https://os.copernicus.org/preprints/os-2012-16/ |
op_doi |
https://doi.org/10.5194/osd-9-611-2012 |
_version_ |
1766081233487396864 |