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- Author or Editor: Yukihiro Mori x
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Abstract
Using the winds in Japan as an example, the validity of the vectorial treatment of the surface wind in climatological investigations has been demonstrated, and the expressions for climatological mean and variability of the wind have been reviewed. The annual resultant surface winds tend to be westerly at latitudes higher than 30° and easterly at lower latitudes. At lower latitudes, the mean surface winds and the mean 850 mb winds are almost opposite to each other in direction at times.
Climatological mean wind directions according to different definitions have been investigated for the surface wind. The means of wind direction agree with the directions of the vector mean wind within 30° where the magnitudes of the vector mean wind are larger than 1.5 m s−1. The relationships between the two measures of the constancy of the wind are investigated.
Abstract
Using the winds in Japan as an example, the validity of the vectorial treatment of the surface wind in climatological investigations has been demonstrated, and the expressions for climatological mean and variability of the wind have been reviewed. The annual resultant surface winds tend to be westerly at latitudes higher than 30° and easterly at lower latitudes. At lower latitudes, the mean surface winds and the mean 850 mb winds are almost opposite to each other in direction at times.
Climatological mean wind directions according to different definitions have been investigated for the surface wind. The means of wind direction agree with the directions of the vector mean wind within 30° where the magnitudes of the vector mean wind are larger than 1.5 m s−1. The relationships between the two measures of the constancy of the wind are investigated.
Abstract
Climatelogical aspects of the geostrophic wind calculated from geopotential heights in the planetary boundary layer in Japan have been investigated. The mean geostrophic winds at the 850 mb level nearly agree with the observed 850 mb winds in both magnitude and direction, with some exceptions. The mean geostrophic wind vectors at the 850 mb and 1000 mb levels for each site are significantly different from each other, especially in winter. This suggests that the large thermal wind exists in the 1000–850 mb layer. It is suggested that the mean geostrophic wind shear is nearly constant with height in this layer.
Abstract
Climatelogical aspects of the geostrophic wind calculated from geopotential heights in the planetary boundary layer in Japan have been investigated. The mean geostrophic winds at the 850 mb level nearly agree with the observed 850 mb winds in both magnitude and direction, with some exceptions. The mean geostrophic wind vectors at the 850 mb and 1000 mb levels for each site are significantly different from each other, especially in winter. This suggests that the large thermal wind exists in the 1000–850 mb layer. It is suggested that the mean geostrophic wind shear is nearly constant with height in this layer.
