ERA-40 SST and Sea Ice Concentration Data
The lower boundary condition of sea surface temperature (SST) and sea-ice concentration (sic) is a critical forcing of the lower frequencies in multi-decadal global atmospheric reanalyses such as ERA-40. Partly in response to the ERA-40 project, new SST/sic data sets have been developed that are con...
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ftosti:oai:osti.gov:15005718 2023-07-30T04:06:45+02:00 ERA-40 SST and Sea Ice Concentration Data Fiorino, M 2018-08-20 application/pdf http://www.osti.gov/servlets/purl/15005718 https://www.osti.gov/biblio/15005718 https://doi.org/10.2172/15005718 unknown http://www.osti.gov/servlets/purl/15005718 https://www.osti.gov/biblio/15005718 https://doi.org/10.2172/15005718 doi:10.2172/15005718 54 ENVIRONMENTAL SCIENCES BOUNDARY CONDITIONS INTERPOLATION PROCESSING SATELLITES SEAS SPECIFICATIONS 2018 ftosti https://doi.org/10.2172/15005718 2023-07-11T11:03:22Z The lower boundary condition of sea surface temperature (SST) and sea-ice concentration (sic) is a critical forcing of the lower frequencies in multi-decadal global atmospheric reanalyses such as ERA-40. Partly in response to the ERA-40 project, new SST/sic data sets have been developed that are considerably improved over those available to the first-generation reanalyses. This paper documents the input SST/sic data sets and the processing that created the daily SST/sic specification for the ERA-40 period 1956-2001. The source data are: (1) the monthly mean HadISST data set from the UKMO Hadley Centre for 1956-1981; and (2) the weekly NCEP 2DVAR data for 1982-present. Both data sets are reanalyses of satellite and conventional SST/sic observations. The principal reason for the higher quality of these source data sets is the use of a common consensus sic and a common sic-SST relationship in the sea ice margins. The use of a common sic resulted in a very smooth transition between HadISST and NCEP 2DVAR, despite differences in data assimilation techniques and monthly versus weekly analyses. No special action was required to insure consistency at the transition unlike as was necessary for the AMIP II experiment (Fiorino, 1997). The only special processing was application of the AMIP II mid-month calculation (Taylor et al., 2000) for the interpolation of monthly mean data to daily values. This scheme insures that the monthly mean of the daily-interpolated data is nearly identical to the input monthly mean. Detailed comparisons of the SST and sic during the HadISST-NCEP transition, and other long time series, are given. We also compare the NCEP 2DVAR (circa 2000) to a newer version of the OISST (V2, circa 2001) and demonstrate that the small differences should have no impact on the ERA-40 atmosphere reanalyses. Other/Unknown Material Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
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54 ENVIRONMENTAL SCIENCES BOUNDARY CONDITIONS INTERPOLATION PROCESSING SATELLITES SEAS SPECIFICATIONS |
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54 ENVIRONMENTAL SCIENCES BOUNDARY CONDITIONS INTERPOLATION PROCESSING SATELLITES SEAS SPECIFICATIONS Fiorino, M ERA-40 SST and Sea Ice Concentration Data |
topic_facet |
54 ENVIRONMENTAL SCIENCES BOUNDARY CONDITIONS INTERPOLATION PROCESSING SATELLITES SEAS SPECIFICATIONS |
description |
The lower boundary condition of sea surface temperature (SST) and sea-ice concentration (sic) is a critical forcing of the lower frequencies in multi-decadal global atmospheric reanalyses such as ERA-40. Partly in response to the ERA-40 project, new SST/sic data sets have been developed that are considerably improved over those available to the first-generation reanalyses. This paper documents the input SST/sic data sets and the processing that created the daily SST/sic specification for the ERA-40 period 1956-2001. The source data are: (1) the monthly mean HadISST data set from the UKMO Hadley Centre for 1956-1981; and (2) the weekly NCEP 2DVAR data for 1982-present. Both data sets are reanalyses of satellite and conventional SST/sic observations. The principal reason for the higher quality of these source data sets is the use of a common consensus sic and a common sic-SST relationship in the sea ice margins. The use of a common sic resulted in a very smooth transition between HadISST and NCEP 2DVAR, despite differences in data assimilation techniques and monthly versus weekly analyses. No special action was required to insure consistency at the transition unlike as was necessary for the AMIP II experiment (Fiorino, 1997). The only special processing was application of the AMIP II mid-month calculation (Taylor et al., 2000) for the interpolation of monthly mean data to daily values. This scheme insures that the monthly mean of the daily-interpolated data is nearly identical to the input monthly mean. Detailed comparisons of the SST and sic during the HadISST-NCEP transition, and other long time series, are given. We also compare the NCEP 2DVAR (circa 2000) to a newer version of the OISST (V2, circa 2001) and demonstrate that the small differences should have no impact on the ERA-40 atmosphere reanalyses. |
author |
Fiorino, M |
author_facet |
Fiorino, M |
author_sort |
Fiorino, M |
title |
ERA-40 SST and Sea Ice Concentration Data |
title_short |
ERA-40 SST and Sea Ice Concentration Data |
title_full |
ERA-40 SST and Sea Ice Concentration Data |
title_fullStr |
ERA-40 SST and Sea Ice Concentration Data |
title_full_unstemmed |
ERA-40 SST and Sea Ice Concentration Data |
title_sort |
era-40 sst and sea ice concentration data |
publishDate |
2018 |
url |
http://www.osti.gov/servlets/purl/15005718 https://www.osti.gov/biblio/15005718 https://doi.org/10.2172/15005718 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
http://www.osti.gov/servlets/purl/15005718 https://www.osti.gov/biblio/15005718 https://doi.org/10.2172/15005718 doi:10.2172/15005718 |
op_doi |
https://doi.org/10.2172/15005718 |
_version_ |
1772819630628274176 |