热带气象学报2011，Vol.27Issue(3)：410-416,7.DOI:10.3969/j.issn.1004-4965.2011.03.015
稳定层结条件下非线性相似函数对蒸发波导模型的改进
IMPROVEMENT TO THE EVAPORATION DUCT MODEL BY INTRODUCING NONLINEAR SIMILARITY FUNCTIONS IN STABLE CONDITIONS
摘要
Abstract
Modified refractivity (M) profile is an important parameter in describing the atmospheric refraction environment and a key factor in the electromagnetic wave propagation evaluation.To improve the model-derived M profiles in stable, especially very stable, conditions, three nonlinear similarity functions, namely, BH91, CB05, and SHEBA07, were introduced to improve the original Babin_V25 model, and the hydrometeorological observations from the iron tower platform were utilized to evaluate the effects of the modified models, which were finally compared with the original Babin_V25 model and Local_HYQ92 model.Results are as follows.Introducing nonlinear similarity functions, especially the newly developed SHEBA07 functions, can significantly improve the model-derived M profile, and the predicted root-mean-square M difference and M slope difference for both 0～5 m and 5～40 m in stable conditions can be reduced by 64.5％, 16.6％, and 60.4％ respectively when the modified Babin SHEBA07 model is applied.Unfortunately, however, this method cannot improve the prediction of the evaporation duct height.In contrast, the Local_HYQ92 model based on the theory of Local Similarity can manage to reduce the predicted root-mean-square M difference, M slope difference for both 0～5m and 5～40 m, and evaporation duct height difference by 76.7％, 40.2％, 83.7％, and 58.0％, respectively.Finally, a new recommendation is made to adopt Local_HYQ92 and Babin_SHEBA07 in very stable conditions in view of the more important role played by the M slope in determining electromagnetic propagation as compared to duct height and absolute M values.关键词
蒸发波导/相似理论/通量-廓线关系/无量纲相似函数/稳定边界层/雷达探测性能Key words
evaporation duct/ similarity theory/ flux-profile relationship/ nondimensional similarity functions/ stable boundary layer/ electromagnetic wave propagation/ radar detective ability分类
天文与地球科学引用本文复制引用
丁菊丽,费建芳,黄小刚,胡晓华,周鑫..稳定层结条件下非线性相似函数对蒸发波导模型的改进[J].热带气象学报,2011,27(3):410-416,7.基金项目
国家自然科学基金重点项目(40830958) （40830958）
国家重点基础研究发展规划项目(973)课题(2009CB421502)共同资助 （973）
