Oceanic Evaporation Duct Diagnosis Model Based on Air-sea Flux Algorithm

Li Yunbo; Zhang Yonggang; Tang Haichuan; Wang Hua; Jiao Lin

Vol.20, NO.5, 2009

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2009 > 20(5): 628-633

Li Yunbo, Zhang Yonggang, Tang Haichuan, et al. Oceanic evaporation duct diagnosis model based on air-sea flux algorithm. J Appl Meteor Sci, 2009, 20(5): 628-633.

Citation:

Li Yunbo, Zhang Yonggang, Tang Haichuan, et al. Oceanic evaporation duct diagnosis model based on air-sea flux algorithm. J Appl Meteor Sci, 2009, 20(5): 628-633.

Li Yunbo, Zhang Yonggang, Tang Haichuan, et al. Oceanic evaporation duct diagnosis model based on air-sea flux algorithm. J Appl Meteor Sci, 2009, 20(5): 628-633.

Citation:

Li Yunbo, Zhang Yonggang, Tang Haichuan, et al. Oceanic evaporation duct diagnosis model based on air-sea flux algorithm. J Appl Meteor Sci, 2009, 20(5): 628-633.

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Oceanic Evaporation Duct Diagnosis Model Based on Air-sea Flux Algorithm

Department of Military Oceanography, Dalian Naval Academy, Dalian 116018

Received Date: 2008-07-21
Rev Recd Date: 2009-06-22
Publish Date: 2009-10-31

Abstract

Abstract

Evaporation duct is a prevailing weather phenomenon that occurs on the sea, which is also the most important factor of anomalous propagation of electromagnetic wave. It influences the application of radar, correspondence and electronic equipment seriously. But there are some problems in the evaporation duct diagnosis model. For example, the diagnostic precision of many empirical functions summarized in land trials, is not validated in oceanic environment; the practicability of Monin-Obukhov Similarity Theory (MOST) in very low wind speed is limited; the seawater salinity has influences on water vapor press. TOGA COA RE flux algorithm supplies so me conditions for the precise diagnosis of Oceanic evaporation duct. Utilizing COARE 3.0 flux algorithm by Fairall and "gustiness" by Godfrey et al, the traditional MOST is appropriate to low wind speed condition, and evaporation duct model is established based on the flux algorithm (called Flux Evaporation Duct Model) combined with the precise atmospheric refractive index formula. Using the tower actual observation data in Ping tan Island during May, the Flux Evaporation Duct Model is compared with US Navy's Paulus-Jeske Model on evaporation duct height (EDH) and the profile of modified refractivity M. Gene rally speaking, the EDH calculated by the Flux Evaporation Duct Model is close to the actual data, superior to Paulus-Jeske Model obviously.But the two models' precision in the unstable cases is better than the stable cases. M-profiles computed by the Flux Model tally with the iron tower fitting results, the profile curvature computed by PJ Model is better, but there is obvious deviation for M value in the low altitude. In the comparison, it's found the EDH diagnosis accuracy does not mean the M profiles tally with the actual situation. Finally, using the marine radar sounding trial data in 2002, it's further verified the result that the Flux Model is able to provide good duct environment parameters for marine electro magnetic propagation computation and increase the precision of the radar sounding performance.
- evaporation duct;
- TOGA COARE;
- flux algorithm;
- Monin-Obukhov similarity theory

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References(18)

Figures and Tables

图 1 实测数据拟合廓线图

Fig. 1 Profile of least squares log-linear curve fit to the tower data

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图 2 模型计算蒸发波导高度与实测高度对比散点图

Fig. 2 Plot of PJ and Flux Model duct height versus boatde-rived duct height for the tower data

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图 3 标准2的计算结果

Fig. 3 The result of Standard 2

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图 4 标准3计算结果

Fig. 4 The result of Standard 3

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图 5 稳定条件下铁塔(a)、模型(b)的M廓线

Fig. 5 Plot of modified refractivity profile as deter mined by the tow er data(a)for comparison with the models(b)from Ping tan Island in the stable cases

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图 6 不稳定条件下铁塔(a)、模型(b)的M廓线

Fig. 6 As in Fig. 5, but for the unstable cases

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图 7 雷达电磁波单程传播损耗随距离分布

Fig. 7 Plot of the radar wave one-way propagation loss distribution

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References

[1]	姚展予, 赵柏林, 李万彪, 等.大气波导特征分析及其对电磁波传播的影响.气象学报, 2000, 58(5): 605-616. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXB200005008.htm
[2]	Hitney H V, Richter J H. Integrated Refractive Effects Prediction System (IRE PS).Naval Engineers Journal, 1976, 88(2): 257-262 doi: 10.1111/nej.1976.88.issue-2
[3]	Paulus R A.Practical Application of the IREPSE vaporation Duct Model.Naval Ocean System Center Technical Report, 1984.
[4]	Liu W T, Katsaros K B, Businger J A.Bulk parameterization of air-sea exchanges of heat and water vapor including the molecular constraints at the interface.J Atmos Sci, 1979, 36 : 1722-1735. doi: 10.1175/1520-0469(1979)036<1722:BPOASE>2.0.CO;2
[5]	Babin S M. A New Model of the Oceanic Evaporation Duct and Its Comparison with Current Models.University of Maryland, 1996.
[6]	Newton D A. COAMPS Modeled Surface Layer Refractivity in the Roughness and Evaporation Duct Experiment 2001. Naval Postgraduate School, 2003. https://www.researchgate.net/publication/235124091_COAMPS_Modeled_Surface_Layer_Refractivity_in_the_Roughness_and_Evaporation_Duct_Experiment_2001?_sg=eSLkLsfYBdOXplPKv8nwEL9_V3GcMlve6XUHvTrg5uXbaooXSv9-Pxoqk22tWTCwGtV9CA04618TPSzavUKnQg
[7]	刘成果, 黄际英, 江成荫, 等.用伪折射率和相似理论计算海上蒸发波导剖面.电子学报, 2001, 29(7): 970-972. http://www.cnki.com.cn/Article/CJFDTOTAL-DZXU200107030.htm
[8]	戴福山.大气波导及其军事应用.北京:解放军出版社, 2002.
[9]	Fairall C W, Bradley E F, Ed son J B, et al.Bulk parameterization of air-sea fluxes for Tropical Ocean-Global Atmosphere Coupled-Ocean Response Experiment. J Geophys Res, 1996: 3747-3764. http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.469.6689
[10]	Fairall C W, Hare J E, Edson J B, et al.Measurement and parameterization of the air-sea gas transfer.Bound-Layer Meteor, 2000, 96:63-105.
[11]	Fairall C W, Bradley E F.Bulk parameterization of air-sea fluxes:Updates and verification for the COARE algorithm. J Climate, 2003. 2: 571-592 http://d.wanfangdata.com.cn/NSTLQK_10.1175-1520-0442(2003)016-0571-BPOASF-2.0.CO;2.aspx
[12]	阎俊岳.中国邻海海-气热量、水汽通量计算和分析.应用气象学报, 1999, 10(1): 9-19. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19990141&flag=1
[13]	姚华栋, 任雪娟, 马开玉. 1998年南海季风试验期间海-气通量的估算.应用气象学报, 2003, 14(1): 87-92. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20030110&flag=1
[14]	姚华栋, 李骥, 丁一汇. TOGA-COARE IOP海表通量估算.气象学报, 1996, 54(6): 693-708. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXB606.005.htm
[15]	Geernaert G L, Plan W J.Surface Waves and Fluxes.Boston : Kluwer Academic Publishers, 1990.
[16]	Godfrey J S, Beljaars A C M. On the turbulent fluxes of buoyancy, heat, and moisture at the air-sea interface at low wind speeds. J Geophys Res, 1991, 96: 22043-22048. doi: 10.1029/91JC02015
[17]	Bean B R, Dutton E J.Radio Meteorology.New York:Dover Publications, 1968.
[18]	黄小毛, 张永刚, 唐海川, 等.大气波导对雷达异常探测影响的评估与试验分析.电子学报, 2006, 34(4): 722-725. http://www.cnki.com.cn/Article/CJFDTOTAL-DZXU200604029.htm