关于WRF每一层气温的计算

帅气小葛

WRF输出的结果中，只有每一层的扰动位温。实际位温和扰动位温的换算如下：

The conversion is quite simple. The formula to convert perturbation potential temperature to total potential temperature in K can be found in the WRF users manual (p. 5-58 in the July 2009 edition, under section "WRF Output Fields", sub-section "Special WRF Output Variables) and it reads: Total pot. temp. in K = T + 300 (T is the perturbation pot. temp.) The forumla to convert total potential temperature to "normal" temperature can be found in virtually any meteorology book. The potential temperature is the temperature a parcel of air having a certain pressure p and temperature ("normal" temp.) would attain if brought dry adiabatically to a standard pressure p_0 (this is usually taken to be 1000 mbar).  The conversion formula is: pot. temp. = "normal" temp. * (p_0/p)^kappa From this: "normal" temp. = pot. temp. * (p/p_0)^kappa p_0 = 1000 mbar p is the pressure in mbar  kappa is the Poisson constant (kappa = R/c_p), the ratio of the gas constant R to the specific heat at constant pressure c_p. For dry air kappa = 0.2854.
那么问题就来了，Kappa直接用0.2854计算吗？因为这个是干空气的值。