SGER: Modeling the Atmospheric Circulation Over the Arctic

拟议的项目将执行和分析气候社区模式(CCM)在T42、T85和T170分辨率下的非耦合大气模式比对项目(AMIP-2)类型的积分。PIS将测试模拟海平面气压(SLP)的偏差是否由(I)地形，特别是格陵兰上空的气流分辨率不足，(Ii)瞬变环流分辨率不足，包括地面对北部高纬度风暴路径的气旋生成和气旋演变的影响，(Iii)模式物理对云和大气辐射的模拟不佳，以及(Iv)海冰上规定的表面边界条件过于简化造成的。改进对北极地面风和SLP的GCM模拟是获得有用的北极气候耦合模拟的先决条件。这项工作很重要，因为它将为CSM项目提供强有力的诊断支持，该项目来自一个大学小组，该小组致力于对观测到的高纬度气候变率进行动态诊断。

The proposed project will perform and analyze uncoupled Atmospheric Model Intercomparison Project (AMIP-2) type integrations of the Climate Community Model (CCM) at T 42, T85 and T170 resolutions. The PIs will test if biases in simulated sea level pressure(SLP) are caused by (i) insufficient resolution of flow over orography, especially Greenland, (ii) insufficient resolution of transient circulations including surface effects on cyclogenesis and cyclone evolution in the storm tracks of high northern latitutes, (iii) poor simulation of clouds and atmospheric radiation due to model physics and (iv) over-simplification in the prescribed surface boundary conditions over sea ice. Improving GCM simulations of arctic surface winds and SLP is a prerequisite to obtaining useful coupled simulations of the arctic climate. The work is important because it will provide strong diagnostics underpinning to the CSM project from a university based group engaged in dynamical diagnosis of observed climate variability at high latitudes.