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ZHANG Ruonan, WU Bingyi. 2011: The Northern Hemisphere Atmospheric Response to Spring Arctic Sea Ice Anomalies in CAM3.0 Model. Chinese Journal of Atmospheric Sciences, 35(5): 847-862. DOI: 10.3878/j.issn.1006-9895.2011.05.05
Citation: ZHANG Ruonan, WU Bingyi. 2011: The Northern Hemisphere Atmospheric Response to Spring Arctic Sea Ice Anomalies in CAM3.0 Model. Chinese Journal of Atmospheric Sciences, 35(5): 847-862. DOI: 10.3878/j.issn.1006-9895.2011.05.05

The Northern Hemisphere Atmospheric Response to Spring Arctic Sea Ice Anomalies in CAM3.0 Model

  • The influence of Arctic Sea Ice Concentration (SIC) anomalies on the atmospheric general circulation during spring and summer is investigated with version 3.0 of the NCAR Community Atmosphere Model (CAM3.0). Regress the second EOF mode of ICE to observed ICE, and then added to climatic ICE as the external force of test. The results show that on the intraseasonal time scale, the atmospheric circulation anomalies evolved from spring to summer, and the spring Arctic SIC anomalies were thermally and dynamically consistent with atmospheric circulation, surface temperature, and rainfall anomalies in spring and summer, especially contributing to less spring rainfall in eastern China and more summer rainfall in northeastern and central China. While on short time scales, the initial adjustment of the atmospheric circulation is characterized by relationship of out of phase in geopotential height anomalies in the lower and upper troposphere locally, and after two weeks, the out of phase turned progressively to more barotropic with the responses propagating to remote areas, at last, the quasi-equilibrium stage of adjustment is reached in the sixth week. The remote responses are regarded as a stationary Rossby wave generated thermally and dynamically through an anomalous turbulent heat fluxes and atmospheric circulation internal varieties. At first, the surface heat fluxes were changed by anomalies in the Arctic SIC, and then a large scale stationary Rossby wave was triggered through the interaction with atmospheric circulation. The lower tropospheric response is baroclinic and thus favors upward emanation of wave activity flux in the negative height anomaly area; while, in upper levels, the energy is dispersed to East Asia through teleconnection, the internal varieties keeping the energy, and then affects the climate in this area.
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