Show simple item record

dc.contributor.authorBonekamp H
dc.contributor.authorSterl A
dc.contributor.authorKomen GJ
dc.contributor.authorBurgers G
dc.contributor.authorOldenborgh GJ van
dc.contributor.authorJanssen PAEM
dc.date.accessioned2012-12-12T20:52:48Z
dc.date.available2012-12-12T20:52:48Z
dc.date.issued2001-05-11
dc.identifier410200063
dc.identifier.isbn90 5851 0417
dc.identifier.urihttp://hdl.handle.net/10029/260542
dc.description.abstractAbstract niet beschikbaar
dc.description.abstractAs a contribution to ongoing efforts in modelling of the coupled atmosphere/ocean system we have assessed global fields of air/sea fluxes of heat and momentum, produced as part of the European Centre for Medium-range Weather Forecast Reanalysis project (ERA). In the wave part of this project we made a 15-year simulation of the global wave climate, by forcing a reliable wave model with ERA winds, and by compiling a data base of wave observations. By comparing the wave model response with the observed wave heights we were able to assess the quality of the ERA surface winds, and associated momentum fluxes. In general, agreement was good, confirming the accuracy of ERA. However, high waves were underpredicted. We have given arguments that this underprediction results from the relatively low resolution of the atmospheric model. We have also studied the wind stress parameterization of the planned 40-year reanalysis (ERA40). In this reanalysis the aerodynamical roughness of the sea surface depends on the sea state which is calculated with the wave model. We have found that the ERA40 parameterization leads to a better representation of observed wind stress variability. In the ocean part of the project we assessed heat and momentum fluxes by forcing general circulation models of the ocean and by comparing the (upper) ocean temperature response with observations of the deeper ocean. Although the scope of our study is global we made a special study of the response of the Southern Ocean and of the Tropical Pacific. From our Southern Ocean study the main conclusion was that ERA has a realistic interannual variability in heat and momentum fluxes. In our Tropical Pacific study we developed a method which allows the improvement of both the fluxes and the ocean analysis.
dc.description.sponsorshipNOP
dc.format.extent140 p
dc.language.isoen
dc.publisherKNMI
dc.publisherde Bilt
dc.publisherEuropean Centre for Medium-Range Weather Forecasts (ECMWF)
dc.relation.ispartofGlobal Change NOP-NRP report 410200063
dc.relation.urlhttp://www.rivm.nl/bibliotheek/rapporten/410200063.html
dc.subject10nl
dc.subjectmeteorologienl
dc.subjectzeeennl
dc.subjectluchtnl
dc.subjectatmosfeernl
dc.subjectmodellemonderzoeknl
dc.subjectklimaatnl
dc.subjectmeteorologyen
dc.subjectseasen
dc.subjectairen
dc.subjectatmosphereen
dc.subjectmodellingen
dc.subjectclimateen
dc.titleAn assessment of the ECMWF reanalysis (ERA) air/sea fluxes using Wave and Ocean General Circulation Modelsen
dc.title.alternativeEen assessment van de heranalyse (ERA) van het ECMWF zee-oppervlak fluxen door middel van de Wave and Ocean General Circulation Modellennl
dc.typeReport
dc.contributor.departmentNOP
dc.date.updated2012-12-12T20:52:48Z
html.description.abstractAbstract niet beschikbaar
html.description.abstractAs a contribution to ongoing efforts in modelling of the coupled atmosphere/ocean system we have assessed global fields of air/sea fluxes of heat and momentum, produced as part of the European Centre for Medium-range Weather Forecast Reanalysis project (ERA). In the wave part of this project we made a 15-year simulation of the global wave climate, by forcing a reliable wave model with ERA winds, and by compiling a data base of wave observations. By comparing the wave model response with the observed wave heights we were able to assess the quality of the ERA surface winds, and associated momentum fluxes. In general, agreement was good, confirming the accuracy of ERA. However, high waves were underpredicted. We have given arguments that this underprediction results from the relatively low resolution of the atmospheric model. We have also studied the wind stress parameterization of the planned 40-year reanalysis (ERA40). In this reanalysis the aerodynamical roughness of the sea surface depends on the sea state which is calculated with the wave model. We have found that the ERA40 parameterization leads to a better representation of observed wind stress variability. In the ocean part of the project we assessed heat and momentum fluxes by forcing general circulation models of the ocean and by comparing the (upper) ocean temperature response with observations of the deeper ocean. Although the scope of our study is global we made a special study of the response of the Southern Ocean and of the Tropical Pacific. From our Southern Ocean study the main conclusion was that ERA has a realistic interannual variability in heat and momentum fluxes. In our Tropical Pacific study we developed a method which allows the improvement of both the fluxes and the ocean analysis.


This item appears in the following Collection(s)

Show simple item record