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Characteristic Study of the boundary layer Parameters over the Arabian Sea and the Bay of Bengal Using the QuikSCAT Dataset

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Advances in Atmospheric Sciences 2007年第4期24卷 631-643页

作者： V.HAMZA C.A.BABU T.P.SABIN Department of Atmospheric Sciences Cochin University of Science and TechnologyCochin-682 016India

The marine atmospheric boundary layer （MABL） plays a vital role in the transport of momentum and heat from the surface of the ocean into the atmosphere. A detailed study on the MABL characteristics was carried out using high-resolution surface-wind data as measured by the QuikSCAT （Quick scatterometer） satellite. Spatial variations in the surface wind, frictional velocity, roughness parameter and drag coefficient for the different seasons were studied. The surface wind was strong during the southwest monsoon season due to the modulation induced by the Low Level Jetstream. The drag coefficient was larger during this season, due to the strong winds and was lower during the winter months. The spatial variations in the frictional velocity over the seas was small during the post-monsoon season （-0.2 m s^-1）. The maximum spatial variation in the frictional velocity was found over the south Arabian Sea （0.3 to 0.5 m s^-1） during the southwest monsoon period, followed by the pre-monsoon over the Bay of Bengal （0.1 to 0.25 m s^-1）. The mean wind-stress curl during the winter was positive over the equatorial region, with a maximum value of 1.5×10^-7 N m^-3, but on either side of the equatorial belt, a negative wind-stress curl dominated. The area average of the frictional velocity and drag coefficient over the Arabian Sea and Bay of Bengal were also studied. The values of frictional velocity shows a variability that is similar to the intraseasonal oscillation （ISO） and this was confirmed via wavelet analysis. In the case of the drag coefficient, the prominent oscillations were ISO and quasi-biweekly mode （QBM）. The interrelationship between the drag coefficient and the frictional velocity with wind speed in both the Arabian Sea and the Bay of Bengal was also studied.

关键词： boundary layer characteristics drag coefficient frictional velocity roughness length QuikSCAT wind

Vertical Atmospheric Structure of the Late Summer Clear Days over the East Gansu Loess Plateau in China

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Advances in Atmospheric Sciences 2009年第3期26卷 381-389页

作者：韦志刚文军李振朝 Laboratory for Climate Environment and Disasters of Western China Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000

In this paper, by using the sounding data collected in LOPEX05, we have analyzed the vertical atmospheric structure and boundary layer characteristics of temperature and humidity in the late summer over the east Gansu loess plateau. The results show that the bottom of the stratosphere is at about 16 500 m and varies between 14 000 m and 18 000 m above the ground. The center of the westerly jet is located between 8300 m and 14 300 m above the ground and its direction moves between 260~ and 305~. There is an inverse humidity layer at about 3000 m height above the ground. The maximum of the air temperature occurs at 1700 LST in the layer below 800 m above the ground. The inversion layer is relatively thick. The time that the maximum of the vapor occurs is not the same for different layers. The depth of the atmospheric boundary layer can reach about 1000 m and the depth of the stable boundary layer can be 650 m.

关键词： atmospheric structure boundary layer characteristics the Chinese Loess Plateau

THE PHYSICAL STRUCTURE OF THE WINTER FOG IN CHONGQING METROPOLITAN AREA AND ITS FORMATION PROCESS

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Acta meteorologica Sinica 1994年第3期8卷 316-328页

作者：李子华张利民张庆鸿 Nanjing Institute of Meteorology Nanjing 210044 Chongqing Weather Bureau Chongqing 630039

Chongqing is a very famous foggy metropolitan in *** Chongqing Fog Experiment Group carried out com- prehensive experiments on a large and extensive scale in the Chongqing urban area from 15 December 1989 to 15 Janua- ry *** several items were further observed from 7 December 1990 to 7 January *** on the analysis of the observational data,some important characteristics of the Chongqing winter fog and the boundary layer structure have been *** is found that such factors as topography,mountain wind,rivers,the urban heat island and air pollution,all contribute to the formation of the Chongqing fog in addition to the radiation conditions.

关键词： fog boundary layer characteristics mountain wind droplet spectrum analysis