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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >DYNAMICS OF WINTERTIME STRATOSPHERIC TRANSPORT IN THE GEOPHYSICAL FLUID DYNAMICS LABORATORY SKYHI GENERAL CIRCULATION MODEL
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DYNAMICS OF WINTERTIME STRATOSPHERIC TRANSPORT IN THE GEOPHYSICAL FLUID DYNAMICS LABORATORY SKYHI GENERAL CIRCULATION MODEL

机译：地球物理流体动力学实验室SKYHI一般环流模型的冬季平流传输动力学

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摘要

The kinematics of air motions in and around the polar vortices in the Geophysical Fluid Dynamics Laboratory SKYHI general circulation model are investigated by means of a Lagrangian particle analysis. Particles initialized in the mesosphere and upper stratosphere rapidly descend to the middle stratosphere. This descent is unmixed in the sense that the isentropic mass transport into the vortex is less than 5% of the vortex mass per month. Transport out of the vortex is less than 10% of the vortex mass per month. The reversible component of the Lagrangian mean downward velocity (in isentropic coordinates) is approximated to better than 20% by the diabatic heating rate at the time mean location of the center of mass. The interplay between diabatic descent and horizontal mixing in causing the steepness of tracer contours (e.g., N2O) around the vortex edge is vividly illustrated in our trajectory experiments. These experiments also illustrate the limitations of the concept of ''air parcel'' within the midlatitude surf zone. The dynamics of polar descent are investigated by diagnosing the forcing of the residual circulation. In the upper stratosphere, diabatic descent inside polar vortices is driven by Eliassen-Palm flux divergences associated with motions of-period shorter than 2 days (presumably gravity waves) in the Antarctic, but, of period greater than 3 days (presumably planetary waves) in the Arctic. In the lower stratosphere, long period processes, mainly from the 10 to 1 hPa region, produce descent near the vortex edge in both hemispheres. [References: 36]
机译：通过拉格朗日粒子分析，研究了地球物理流体动力学实验室SKYHI总体循环模型中极涡内及其周围的空气运动运动学。在中层和上层平流层中初始化的粒子迅速下降到中层平流层。这种下降是不混合的，即等熵质量进入涡流的量小于每月涡流质量的5％。离开涡流的运输少于每月涡流质量的10％。拉格朗日平均向下速度的可逆分量（在等熵坐标系中）在质心时间平均位置处的非绝热加热速率近似于20％以上。在我们的轨迹实验中，生动地说明了非绝热下降与水平混合之间的相互作用，导致涡流边缘周围的示踪剂轮廓（例如N2O）变得陡峭。这些实验还说明了中纬度冲浪区内“包裹”概念的局限性。通过诊断残余循环的强迫来研究极地下降的动力学。在高空平流层中，极涡内的非绝热下降是由与南极时期短于2天（大概是重力波）的运动有关的埃利亚森－帕尔姆通量发散所驱动的，而周期运动少于3天（大概是行星波）。在北极。在平流层下部，两个半球的涡旋边缘附近会出现下降，主要是从10到1 hPa区域。 [参考：36]

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