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Large-scale analysis and forecast experiments with wind data from the Seasat A scatterometer
OLR (1984) 31 (12)
B. Marine Meteorology
B180. Winds 84:5965 Baker, W.E. et al., 1984. Large-scale analysis and forecast experiments with wind data from the Seusat A scatterometer. J. geophys. Res., 89(D3): 4927-4936.
The SASS data are dealiased as part of an objective analysis system utilizing a three-pass procedure; data impact is evaluated with and without temperature soundings. In the Northern Hemisphere the SASS data have a negligible effect on forecasts. In the Southern Hemisphere the forecast impact from SASS data is somewhat larger and primarily beneficial in the absence of temperature data; inclusion of temperature data effectively eliminates the positive impact over Australia and South America. SASS data can be beneficial for numerical weather prediction in regions with large data gaps, but in the presence of satellite soundings the usefulness of SASS data is significantly reduced. Goddard Lab. for Atmos. Sci., NASA/Goddard Space Flight Center, Greenbelt, Md. 20771, USA. 84:5966 Churchill, D.D. and R.A. Houze Jr., 1984. Development and structure of winter monsoon cloud dusters on 10 December 1978. J. atmos. Sci., 41(6):933-960.
Cloud clusters over the South China Sea originated as groups of intense convective cells which then developed into mesoscale systems. The dominant cluster began with the formation of a group of cells off the Borneo coast. The stratiform precipitation of this cluster was maintained by the transformation of dying convective cells into stratiform clusters, 'hydrometeors being advected from the tops of active cells into the stratiform precipitation region, and condensation in the mesoscale updraft contributing to the growth of hydrometeors falling as stratified rain.' Includes appendix: Analysis of two-dimensional ice particle images. Dept. of Atmos. Sci., Univ. of Washington, Seattle, Wash. 98195, USA. (msg) 84:5967 Joffre, S.M., 1983. Surface wind predictions and boundary layer mass flow. Geophysica, 20(1): 5169.
A simple dynamical-statistical prediction model for surface wind over the Bothnian Bay is presented. Since thermal stability is difficult to obtain from routine observations, even though it is the main ingredient shaping wind profiles close to the surface, the main goal of this study was to incorporate it
851
implicitly. Statistical relationships between observed upper flow and surface flow or surface drag suggest the use of a new wind concept predictor: the vertically averaged mean wind. Comparison with data gives encouraging results and calls for extension of the method. Inst. of Mar. Res., P.B. 33, 00931 Helsinki 93, Finland. 84:5968 Moil, Yukihiro, 1984. Semidiurunl tidal wind oscillation at Marcus Island. Mon. Weath. Rev., 112(4):755-760.
The daily variation of the surface wind at Marcus Island (24°N, 154°E) was investigated with respect to the semidiurnal atmospheric tide. The semidiurnal oscillations of scalar wind speed and vector components of wind were analyzed harmonically. The phase of the zonal wind component in local time agrees with the observed values at Bermuda and in the Atlantic trades. Using the Ekman model, an analytic solution was obtained for the semidiurnal tidal wind oscillation in the planetary boundary layer. In order to fit the theoretical tidal wind oscillation to the observed one, the eddy viscosity K should be smaller than 0.1 mes-l. This value appears smaller than the representative value in the trades, suggesting the limitations of the simple model. Earth Sci. Lab., Kagawa Univ., Kagawa 760, Japan. 84:5969 Prasad, Kanti, M.C. Pant, M.C. Sharma and M.G. Gupta, 1984. Evolution of the temperature and moisture fields over the Arabian Sea from pre-onset to onset phase of the monsoon during 1979. Mausam, 35(2):219-224.
After onset, dry air replaces moist air in the equatorial regions in the middle troposphere south of 10°N over the central and east Arabian Sea. The middle troposphere over the NW Arabian Sea, mainly dry before onset, becomes highly humid after onset. Vertical circulations with rising motion over the north Arabian Sea and compensatory descending motion southward over the central Arabian Sea and over equatorial latitudes south Of 10°N explain the dryness. Meteorol. Off., New Delhi, India. 84:5970 Xiao, Hui and Shuhui Cai, 1984. The numerical calculation of the wind field above the sea surface of the Tulwan Strait. Taiwan Strait, 3(1):19-29. (In Chinese, English abstract.) Third Inst. of Oceanogr., Nail Bur. of Oceanogr., People's Republic of China.
B. Marine Meteorology
B180. Winds 84:5965 Baker, W.E. et al., 1984. Large-scale analysis and forecast experiments with wind data from the Seusat A scatterometer. J. geophys. Res., 89(D3): 4927-4936.
The SASS data are dealiased as part of an objective analysis system utilizing a three-pass procedure; data impact is evaluated with and without temperature soundings. In the Northern Hemisphere the SASS data have a negligible effect on forecasts. In the Southern Hemisphere the forecast impact from SASS data is somewhat larger and primarily beneficial in the absence of temperature data; inclusion of temperature data effectively eliminates the positive impact over Australia and South America. SASS data can be beneficial for numerical weather prediction in regions with large data gaps, but in the presence of satellite soundings the usefulness of SASS data is significantly reduced. Goddard Lab. for Atmos. Sci., NASA/Goddard Space Flight Center, Greenbelt, Md. 20771, USA. 84:5966 Churchill, D.D. and R.A. Houze Jr., 1984. Development and structure of winter monsoon cloud dusters on 10 December 1978. J. atmos. Sci., 41(6):933-960.
Cloud clusters over the South China Sea originated as groups of intense convective cells which then developed into mesoscale systems. The dominant cluster began with the formation of a group of cells off the Borneo coast. The stratiform precipitation of this cluster was maintained by the transformation of dying convective cells into stratiform clusters, 'hydrometeors being advected from the tops of active cells into the stratiform precipitation region, and condensation in the mesoscale updraft contributing to the growth of hydrometeors falling as stratified rain.' Includes appendix: Analysis of two-dimensional ice particle images. Dept. of Atmos. Sci., Univ. of Washington, Seattle, Wash. 98195, USA. (msg) 84:5967 Joffre, S.M., 1983. Surface wind predictions and boundary layer mass flow. Geophysica, 20(1): 5169.
A simple dynamical-statistical prediction model for surface wind over the Bothnian Bay is presented. Since thermal stability is difficult to obtain from routine observations, even though it is the main ingredient shaping wind profiles close to the surface, the main goal of this study was to incorporate it
851
implicitly. Statistical relationships between observed upper flow and surface flow or surface drag suggest the use of a new wind concept predictor: the vertically averaged mean wind. Comparison with data gives encouraging results and calls for extension of the method. Inst. of Mar. Res., P.B. 33, 00931 Helsinki 93, Finland. 84:5968 Moil, Yukihiro, 1984. Semidiurunl tidal wind oscillation at Marcus Island. Mon. Weath. Rev., 112(4):755-760.
The daily variation of the surface wind at Marcus Island (24°N, 154°E) was investigated with respect to the semidiurnal atmospheric tide. The semidiurnal oscillations of scalar wind speed and vector components of wind were analyzed harmonically. The phase of the zonal wind component in local time agrees with the observed values at Bermuda and in the Atlantic trades. Using the Ekman model, an analytic solution was obtained for the semidiurnal tidal wind oscillation in the planetary boundary layer. In order to fit the theoretical tidal wind oscillation to the observed one, the eddy viscosity K should be smaller than 0.1 mes-l. This value appears smaller than the representative value in the trades, suggesting the limitations of the simple model. Earth Sci. Lab., Kagawa Univ., Kagawa 760, Japan. 84:5969 Prasad, Kanti, M.C. Pant, M.C. Sharma and M.G. Gupta, 1984. Evolution of the temperature and moisture fields over the Arabian Sea from pre-onset to onset phase of the monsoon during 1979. Mausam, 35(2):219-224.
After onset, dry air replaces moist air in the equatorial regions in the middle troposphere south of 10°N over the central and east Arabian Sea. The middle troposphere over the NW Arabian Sea, mainly dry before onset, becomes highly humid after onset. Vertical circulations with rising motion over the north Arabian Sea and compensatory descending motion southward over the central Arabian Sea and over equatorial latitudes south Of 10°N explain the dryness. Meteorol. Off., New Delhi, India. 84:5970 Xiao, Hui and Shuhui Cai, 1984. The numerical calculation of the wind field above the sea surface of the Tulwan Strait. Taiwan Strait, 3(1):19-29. (In Chinese, English abstract.) Third Inst. of Oceanogr., Nail Bur. of Oceanogr., People's Republic of China.