I detected strong drops in the SLP from 20CRv2 not present in the SLP from ERA-interim reanalysis. This happens at some areas, mainly tropical but not exclusively; an example can be seen below for
lon = 134ºW and lat = 14ºN (lower panel is just a zoom of the upper panel). As you can see, differences between both databases can reach 20 mb.
I am using 6-hourly values from both datasets. ERA-interim was downloaded from http://apps.ecmwf.int/datasets/data/interim-full-daily/
and 20CRv2 was downloaded from http://www.esrl.noaa.gov/psd/cgi-bin/db_search/DBListFiles.pl?did=108&t…
Does anybody know if there is a phisical explanation for those drops or if they are outliers?.