IMPROVEMENT TO THE EVAPORATION DUCT MODEL BY INTRODUCING NONLINEAR SIMILARITY FU

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+f5L+I;B#]wF0IMPROVEMENT TO THE EVAPORATION DUCT MODEL BY INTRODUCING NONLINEAR SIMILARITY FUNCTIONS IN STABLE CONDITIONS水利论文#b(@7SVj

O$JHN$fU@!X![$K0Abstract:Modified refractivity(M)profile is an important parameter to describe the atmospheric refraction environment,as well as a key factor in uniquely evaluating electromagnetic propagation effects.In order to improve the model-derived M profile in stable(especially very stable)conditions,three nonlinear similarity functions,namely BH91,CB05,SHEBA07,are introduced in this paper to improve the original Babin_V25model,and the performances of these modified models are verified based on the hydrometeorological observations from tower platforms,which are finally compared with the original Babin_V25 model and Local HYQ92 model.Results show that introducing nonlinear similarity functions can significantly improve the model-derived M profile; especially,the newly developed SHEBA07 functions manage to reduce the predicted root mean square(rms)differences of M and M slope(for both 0-5 m and 5-40 m)by64.5%,16.6%,and 60.4%,respectively in stable conditions.Unfortunately,this improved method reacts little on the evaporation duct height; in contrast,Local_HYQ92 model is capable of reducing the predicted rms differences of M,M slope(for both 0-5 m and 5-40 m),and evaporation duct height by 76.7%,40.2%,83.7%,and 58.0% respectively.Finally,a new recommendation is made to apply Local_HYQ92 and Babin_SHEBA07 in very stable conditions considering that M slope is more important than evaporation duct height and absolute M value in uniquely determining electromagnetic propagation effects.水利论文[h WW3r9c

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作者:

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6ZP7u%ll)][^0DING Ju-li[1] FEI Jian-fang[1] HUANG Xiao-gang[1] HU Xiao-hua[2] ZHOU Xin[3]

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作者单位:

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Institute of Meteorology,PLA University of Science and Technology,Nanjing 211101 ChinaBeijing 100081 China,nit,61741UQinhuangdao 066200 China,Unit,91404

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热带气象学报(英文版)水利论文N^#c)wTi2r

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JOURNAL OF TROPICAL METEOROLOGY

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2011, 17(1)

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分类号:

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P435

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Keywords:

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;qg3o)F@N-zz9T j0evaporation duct

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similarity theory水利论文.V*m4ow"f\{

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flux-profile relationship

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nondimensional similarity functions水利论文q8]||7umaYHE1e

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stable boundary layer

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electromagnetic wave propagation

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N#p3W l*i7i%we}0radar detective ability

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a2?m)g9~2Df,l0机标分类号:水利论文n"c`CC-zW2J

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机标关键词:

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Y su\SI0SIMILARITY FUNCTIONS similarity functions model differences profile improved method especially new recommendation contrast rms little three paper order based root made key

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基金项目:水利论文;j c4E+V*Dm'@b8}ze4UQ4U

/\2t;^p [2[J0qV3?0Key project of the National Natural Science Foundation of China,the"973"National Basis Research and Development Program of China水利论文[/x3T8U:D;DC2x\

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