Angular Momentum Conservation and Gravity Wave Drag Parameterization: Implications for Climate Models
Angular Momentum Conservation and Gravity Wave Drag Parameterization: Implications for Climate Models
复制标题
角动量守恒和重力波阻力参数化：对气候模型的影响
DOI：
10.1175/jas3823.1
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发表时间：
2007
影响因子：
3.1
通讯作者：
T. Shepherd
中科院分区：
文献类型：
--
作者：
T. Shaw;T. Shepherd
摘要研究了中层大气中参数化重力波响应对辐射扰动的鲁棒性。当动量守恒和合理的重力波阻力参数，对极地冷却的响应诱导极地下降流以上的区域的强制冷却，随之而来的绝热变暖。该响应对重力波源谱、背景流、重力波破碎准则和模型盖高度的变化具有鲁棒性。当动量不守恒，无论是在制定或在执行的重力波阻力参数化，响应变得敏感的上述因素，特别是模型盖的高度。从不守恒产生的虚假响应被发现是不可忽略的总重力波阻力引起的下降流。
Abstract The robustness of the parameterized gravity wave response to an imposed radiative perturbation in the middle atmosphere is examined. When momentum is conserved and for reasonable gravity wave drag parameters, the response to a polar cooling induces polar downwelling above the region of the imposed cooling, with consequent adiabatic warming. This response is robust to changes in the gravity wave source spectrum, background flow, gravity wave breaking criterion, and model lid height. When momentum is not conserved, either in the formulation or in the implementation of the gravity wave drag parameterization, the response becomes sensitive to the above-mentioned factors—in particular to the model lid height. The spurious response resulting from nonconservation is found to be nonnegligible in terms of the total gravity wave drag–induced downwelling.