Structure, Growth Rates, and Tangent Linear Accuracy of Adjoint Sensitivities with Respect to Horizontal and Vertical Resolution
Structure, Growth Rates, and Tangent Linear Accuracy of Adjoint Sensitivities with Respect to Horizontal and Vertical Resolution
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DOI：
10.1175/mwr3227.1
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发表时间：
2006-10
影响因子：
3.2
通讯作者：
B. Ancell;C. Mass
中科院分区：
文献类型：
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作者：
B. Ancell;C. Mass
摘要本文研究了伴随灵敏度随水平和垂直分辨率变化的变化规律。第五代宾夕法尼亚州立大学-国家大气研究中心（PSU-NCAR）中尺度模式（MM5）及其伴随模式与一致的物理特性一起用于产生24小时内的伴随灵敏度。灵敏度是根据响应函数产生的，响应函数定义为俄勒冈州西北部地区最低西格玛水平的扰动压力。研究发现，当栅格间距从216 km减小到24 km时，初始温度敏感性的尺度、幅度和结构都发生了显著变化。在较粗分辨率下，低水平、上切线倾斜、亚天气尺度的敏感性明显，随水平分辨率的增加，波状敏感性在尺度和空间范围上显著降低。还发现微扰增长率取决于…
Abstract In this paper, the variation of adjoint sensitivities as horizontal and vertical resolutions are changed is investigated. The fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5) and its adjoint are used with consistent physics to generate adjoint sensitivities over a 24-h period. The sensitivities are generated with respect to a response function defined as the lowest sigma level perturbation pressure over a region of northwestern Oregon. It is found that the scale, magnitude, and structure of sensitivity with respect to initial temperature varies significantly as grid spacing is decreased from 216 to 24 km. As found in other adjoint studies at relatively coarse resolution, low-level, upshear-tilted, subsynoptic-scale sensitivities were apparent, with the wavelike sensitivity pattern decreasing significantly in scale and spatial extent with increased horizontal resolution. It is also found that perturbation growth rates depend o...