整层水汽通量散度计算及其单位

捷然不同

from1214 发表于 2013-4-15 12:54

                               
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楼主，整层水汽通量计算中为什么是乘以9.8？公式中不是除以g么？求解

vint的函数中除了9.8，我在前面已经除过了，所以相当于除了两次，得乘回来一次

小佳碧玉褚小佳

谢谢分享，正好需要噢

小佳碧玉褚小佳

lldxt

太阳雨 发表于 2013-1-23 21:08

                               
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=(100s**2/9.8m).(g/Kg).(m/s).(Kg/s**2.cm)
请教一下，这个红色标记的100是什么意思啊？还有红色标记的 ...

应该是grads vint函数在实际计算时用的f ,其帮助文档如下：

vint(psexpr,expr,top)

This function performs a mass-weighted vertical integral in mb pressure coordinates. The three arguments to vint are:

psexpr   a GrADS expression for the surface pressure, in mb, which bounds the integral on the bottom.
expr     a GrADS expression representing the quantity to be integrated.
top      the bounding top pressure, in mb. This value must be a constant and cannot be provided as an expression.

The calculation is a sum of the mass-weighted layers:

f/g * sum(expr * Delta(level))
The bounds of the integration are the surface pressure and the indicated top value. The scale factors are f=100 and g=9.8. The summation is done for each layer present that is between the bounds. The layers are determined by the Z levels of the default file. Each layer is considered to be from the midpoints between the levels actually present, and is assumed to have the same value throughout the layer, namely the value of the gridpoint at the middle of the layer.

lldxt

太阳雨 发表于 2013-1-23 21:08

                               
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=(100s**2/9.8m).(g/Kg).(m/s).(Kg/s**2.cm)
请教一下，这个红色标记的100是什么意思啊？还有红色标记的 ...

Kg/s**2.cm是dP(hPa)的转换单位 .

阿托利斯

谢谢楼主分享

娜喵_Cafe

太谢谢啦！

该去四院了

好好学习，天天向上 fighting~~~

班班-Sylvia

单位和量级没弄明白

wysyhd

不错的资源，楼主好人啊