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A bug in the longitude information in CLARA-A2, CLARA-A2.1 and AVHRR ICDR products for the Southern Polar region has been identified (area identifier “SP” in filename). The longitude information is erroneously flipped relative to the data fields of cloud properties and surface albedo. The following products are affected:
Product name | Temporal resolution | CM-identifier | Product family |
---|---|---|---|
CFC – Fractional cloud cover | daily and monthly mean | CM-11011 CM-11015 CM-6010 | CLARA-A ed. 2 CLARA-A ed. 2.1 ICDR AVHRR |
CPH – Cloud phase | daily and monthly mean | CM-11041 CM-11045 | CLARA-A ed. 2 CLARA-A ed. 2.1 |
CTO – Cloud top parameters CTT, CTP and CTH | daily and monthly mean | CM-11031 CM-11035 CM-6030 | CLARA-A ed. 2 CLARA-A ed. 2.1 ICDR AVHRR |
IWP – Ice water path | daily and monthly mean | CM-11061 CM-11065 | CLARA-A ed. 2 CLARA-A ed. 2.1 |
LWP – Liquid water path | daily and monthly mean | CM-11051 CM-11055 | CLARA-A ed. 2 CLARA-A ed. 2.1 |
SAL – Surface albedo | pentad and monthly mean | CM-11221 CM-11225 CM-6220 | CLARA-A ed. 2 CLARA-A ed. 2.1 ICDR AVHRR |
The longitude information can easily be corrected by flipping the longitude fields, e.g. in PYTHON syntax for a file with filename <filename.nc>:
import numpy
import xarray
file = xarray.open_dataset('<filename.nc>’)
lon = file['lon']
lon_corrected = numpy.flip(lon, axis=1) # flip the X-axis
Only the products for the area “Southern Polar Region” (identifier “SP” in filename) are affected. The longitude information for the global coverage (“GL”) as well as for the Northern Polar areas (“NP”) is correct.