The Analysis Of Momentum Fluxes And Marine Atmospheric Boundary Turbulence Characteristics

The sea-air flux exchange is the main process of interaction of each climate system layer laps. The energy and material exchange between atmosphere and ocean's surface reflects ocean-atmosphere and interaction influences the up Marine structure and low atmospheric boundary layer structure, which affect the atmosphere general circulation and ocean circulation caused by different scales, then the weather and climate change. The study of the flux is also very important to understand the Marine-the coupling, changes atmospheric system. Weather and climate patterns of Marine boundary parameter uncertainty have greatly influenced the simulation capability.Using eddy correlation method for measuring the flux boundary is the most reliable measurement method, but due to the complex environment and some specific conditions, the observation is difficulty. Use the atmospheric turbulence observation data of 908 project of ST02 during 2006-2007 and the standardization of national offshore sea experiment of 863 project in 2005,try to overcome the difficulty of observation and calculation, using eddy correlation method to calculate the momentum fluxes, drag coefficient deviations, air force, analyzes the characteristics of roughness of the north and south of north yellow sea, the sea and the west Pacific Luzon. Some significant conclusions:(1)Through calculating stability parameters of offshore surface, it was found that atmosphere in a stable, weak instability state at most of the time(2) Three areas' momentum fluxes are calculated, which observed in the R/V dongfanghong 2 with the same equipment of the same observation method and calculation method. The North Yellow sea in autumn and winter, north china sea and Luzon channel, the western Pacific momentum fluxes average respectively is 0.079,0.081,0.107,0.070 N/m2.(3) The drag and bulk aerodynamic coefficients are sensitive to changes of the average wind speed, when the average wind speed smaller than 4m/s. The North Yellow sea in autumn and winter, north China sea and Luzon channel, the western Pacific momentum 103CD respectively is 1.335,1.359,1.046,1.324.(4) Results show the magnitude of turbulence intensity that over the sea surface is 10-2, which is lower than that of the land underlying surface.(5) The relationship between standard deviations of horizontal wind and stability parameters is not obvious. Autumn and winter data over the North Yellow sea verify that standard deviation of vertical velocity meets Monin-Obukhov similarity theory very well. The best fitting relationship in autumn and winter isσw/u*= .9(-Z/L)1/3 andσw/u*=2.0(-Z/L)1/3(6)The sea average wind speed and the roughness are linear relationship, when the average speed more than 4m/s. The best fitting relationship of the North Yellow sea in autumn and winter, north china sea and Luzon channel, the western Pacific momentum 1 respectively is 103Z0=0.0350U-0.1335,103Z0=0.0414U-0.1719,103Z0=0.0429U-0.2004, 103Z0=0.0303U-0.1031。...