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有关垂直风切变的方向问题,看的英文是这样解释的:It's a little more complicated when the two directions are different, involvingsome trigonometry to work out the the shear vector. A fairly simpleexample of this would be a 1000foot wind from the west at 10 mph and a surface wind from the south at 10 mph. In this case, the shear vector would befrom the northwest at 14.1 mph, so that upshear would betoward the northwest and vice versa. 简单的说:顺切变(downshear)就是200hPa垂直风切变矢量减去850hPa垂直风切变矢量。 问题是我用的资料是FNL 1°x1°,有的时次台风中心会在半网格上,这时的方向要怎么确定? 如下图。第一个图是200hPa.第二个850hPa.这时次台风中心在112.4E,19.5N.
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