Improvement of Surface Longwave Flux Algorithms Used in CERES Processing
Improvement of Surface Longwave Flux Algorithms Used in CERES Processing
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DOI：
10.1175/2010jamc2463.1
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发表时间：
2010-07
影响因子：
3
通讯作者：
Shashi K. Gupta;D. Kratz;P. Stackhouse;A. C. Wilber;Taiping Zhang;Victor E. Sothcott
中科院分区：
文献类型：
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作者：
Shashi K. Gupta;D. Kratz;P. Stackhouse;A. C. Wilber;Taiping Zhang;Victor E. Sothcott
摘要根据在验证地面长波通量算法全球结果的过程中所学到的经验教训，对用于云和地球辐射能量系统处理的地表长波通量算法进行了改进和测试。所涉及的算法显示，在一天中炎热的时间段，某些地区，特别是干旱干旱地区，对下行长波通量的估计明显高估。确定了高估的主要原因，并对算法进行了修改，以(I)检测会产生高估的气象条件，以及(Ii)在高估发生时应用校正。这一校正的应用在很大程度上消除了在早期验证研究中观察到的积极偏倚。并对校正前后的验证结果进行了比较。
Abstract An improvement was developed and tested for surface longwave flux algorithms used in the Clouds and the Earth’s Radiant Energy System processing based on lessons learned during the validation of global results of those algorithms. The algorithms involved showed significant overestimation of downward longwave flux for certain regions, especially dry–arid regions during hot times of the day. The primary cause of this overestimation was identified and the algorithms were modified to (i) detect meteorological conditions that would produce an overestimation, and (ii) apply a correction when the overestimation occurred. The application of this correction largely eliminated the positive bias that was observed in earlier validation studies. Comparisons of validation results before and after the application of correction are presented.