Analysis on the response of an Arctic ice-ocean coupled model to two different atmospheric reanalysis datasets

Mu Longjiang; Zhao Jinping

doi:10.3969/j.issn.0253-4193.2015.11.008

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Mu Longjiang, Zhao Jinping. Analysis on the response of an Arctic ice-ocean coupled model to two different atmospheric reanalysis datasets[J]. Haiyang Xuebao, 2015, 37(11): 79-91. doi: 10.3969/j.issn.0253-4193.2015.11.008

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Mu Longjiang, Zhao Jinping. Analysis on the response of an Arctic ice-ocean coupled model to two different atmospheric reanalysis datasets[J]. Haiyang Xuebao, 2015, 37(11): 79-91. doi: 10.3969/j.issn.0253-4193.2015.11.008

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Analysis on the response of an Arctic ice-ocean coupled model to two different atmospheric reanalysis datasets

doi: 10.3969/j.issn.0253-4193.2015.11.008

Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China

Received Date: 2015-04-16

Abstract

Abstract

The downward radiative fluxes, wind speed, near surface temperature, precipitation, humidity got from Climate Forecast System Reanalysis (CFSR) and the Japanese 25-year Reanalysis Project (JRA25) are compared in this article. We find that most significant biases between the two datasets are precipitation, downward fluxes for both shortwave and longwave radiation. Driving by these two datasets, model results forced by CFSR shows big differences on sea ice, Atlantic water and thermohaline structure in Canada basin compared to in situ observations, with the simulated geostrophic current on isopycnal surface 20% higher than that forced by JRA25 and a larger volume fluxes than that derived from SODA data. Sensitivity experiment forced by downward radiative fluxes from CFSR, which have been evaluated to be close to observed values, demonstrates comparable results to observational results. The cloud data plays a key role in modeling sea ice while freshwater flux brought by precipitation can change the heat transport of Atlantic inflow prominently and carry a further effect on sea ice in the Arctic. The overestimated precipitation in CFSR is the major for large biases of volume flux through Fram Strait, geostropic current on isopycnal surface and thermohaline structure in central Arctic. Although reanalysis wind have different resolution for the two datasets, our results indicates that it carries an ignorable effect on modeling sea ice and thermohaline structure on basin scale.
- Arctic Ocean,
- CFSR,
- JRA25,
- ice ocean coupled model,
- Canada Basin,
- Fram strait

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References(32)

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