ECMWF数据插值

朝曦dawn

最近下了ECMWF数据，处理过程需要插值：

如果想将ECMWF的部分数据插值到440 hPa，如何进行？
此外：0◦C等温线又是如何插值得到的呢？

原文如下：
Cloud-top height was taken as the highest level containing a non-zero updraught detrainment rate. This definition follows that used in the TM5 model which also uses ECMWF reanalysis data (P. Le Sager, 2012, personal communication). The cold cloud depth was calculated as the difference between cloud-top height and the interpolated height of the 0 ◦C isotherm. Updraught mass flux was interpolated to the 440 hPa level (typically about 6 km and −25 ◦ C), as were cloud cover and specific cloud ice water content, which are used along with the updraught mass flux to calculate the upward cloud ice flux at 440 hPa as described in Sect. 4.