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A Dipole Pattern between the Sea of Okhotsk and the Bering Sea and Its Influence on the Atmosphere Circulation

Author: WangGuanLin
Tutor: YuanYeLi;YuWeiDong
School: First Institute of Oceanography of State Oceanic Administration
Course: Physical Oceanography
Keywords: the Sea of ??Okhotsk the Bering Sea sea-ice dipole atmosphere circulation
CLC: P731.15
Type: Master's thesis
Year: 2007
Downloads: 53
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Abstract


The trend of Arctic sea ice, as well as both the study area in the Bering Sea and the Sea of ??Okhotsk sea ice dipole phenomenon and its impact of atmospheric circulation. Seasonal trend throughout the Arctic sea ice cover first, skip the most obvious changes in winter sea ice, and changes in the scope of. Thus use EOF decomposition analysis of the dipole changes of the four seasons of the Arctic sea sea ice and confirmed research sea sea ice dipole phenomenon is more obvious in the spring and winter, while in summer is very obvious, to disappear in the fall. And use of two sea of ??sea ice from 1948 to 2005 covering an area of ??abnormal values ??and dipole phenomenon is most obvious in the 1979 sea ice mutations years several characteristics Year, selected according to the results were calculated the HadISST1 sea ice anomaly data and NCEP data set of sea surface air temperature (SAT) and power geopotential height (HGT) synthesis analysis, synthesis and analysis results show that the dipole sea ice anomalies may atmospheric circulation (temperature and geopotential height) have a certain impact. Developed by the French National Dynamics Laboratory (the Laboratoire de Météorologie Dynamique du CNRS) second generation atmospheric the mode - LMDZ mode, in the given idealized the Bering Sea, Sea of ??Okhotsk dipole sea ice anomaly collection of under 20 winter (January-February), atmospheric circulation patterns forced experiment to study the atmospheric circulation response characteristics of this dipole sea ice anomalies, the results of numerical experiments based on the synthetic analysis of the observational data is more consistent dipole sea ice forced performance: low temperature for obvious symmetry response, temperature changes with the vertical structure of baroclinic sea surface temperature changes are mainly concentrated in the low-altitude; altitude atmospheric temperature and layers geopotential height changes with significant asymmetry characteristic vertical barotropic structure geopotential height changes. Reference to existing theory and simulation results, this paper pointed out the change in temperature of the lower atmosphere by direct thermodynamic impact of the adjustment process significantly, the the symmetry response component is obvious, and the upper atmosphere temperature and the layers of the atmosphere geopotential height variation is adjusted by direct thermodynamic and jointly controlled by the indirect dynamic process response, the asymmetric component dominates.

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine hydrology > Marine hydrological factors > Sea ice
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