Subsidence and Upper-Tropospheric Drying along Trajectories in a General Circulation Model.
Subsidence and Upper-Tropospheric Drying along Trajectories in a General Circulation Model.
复制标题
大气环流模型中沿轨迹的沉降和对流层上层干燥。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
D. Hartmann
中科院分区：
文献类型：
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作者：
E. Salathe;D. Hartmann
社区气候模式第3版（CCM 3）湿度模拟的轨迹分析表明，该模型模拟对流层上层湿度观测比传统的地理比较推断。上层对流层湿度模拟相比，上层对流层湿度来自地球静止业务环境卫星6.7毫米观测1992年9月。轨迹开始于热带的对流区，然后进入非对流沉降区。沿轨迹的水分和压力沿着的模型和观测确定。湿度值作为沉降的函数，同意更好的观测和模型之间比地理网格框比较，因为该模型没有模拟大规模的流动模式的细节精确。在CCM 3模拟中，相对湿度随下沉沿着轨迹的下降速度比观测值略慢。
A trajectory analysis of the Community Climate Model version 3 (CCM3) moisture simulation is used to show that the model simulates upper-tropospheric moisture observations better than would be inferred from a traditional geographical comparison. The upper-tropospheric moisture simulation is compared to upper-tropospheric moisture derived from Geostationary Operational Environmental Satellite 6.7-mm observations for September 1992. Trajectories start in convective regions of the Tropics and are followed into nonconvective subsidence regions. Moisture and pressure along the trajectories are determined for both the model and observations. Humidity values as a function of subsidence agree much better between observations and model than do geographical grid box comparisons, because the model does not simulate details in the large-scale flow pattern precisely. The relative humidity decreases slightly more slowly with subsidence along trajectories in the CCM3 simulation than in observations.