求问为什么气象场要加权“根号下cos纬度”？

tooshadow

小白求问，已经看过好几篇文章这么处理数据的了——

我想地球面积的话应该是加权“cos纬度”，没有平方根。

是不是和原始数据的插值方法有关？

谢谢大家！！！



Example：
“The second field, the January-mean NCEP–NCAR Reanalysis sea level pressure (SLP) for the same domain
for each year from 1949 to 2005, provides information about the lower-tropospheric circulation in the
month following the December WAF anomaly. Both fields were each detrended, weighted by the square
root of the cosine of the latitude, and normalized by thetheir respective mean standard.”
COHEN ET AL. ,2007, JOURNAL OF CLIMATE

tooshadow

以及，他之后要做EOF，请问是跟要做EOF有关吗？

wjy_ecnu

楼主知道为什么了吗