Level-2 product definition#
The Level-2b product is the result of the processing from Level-1b brightness temperatures to Level-2R gridded geophysical parameters. The product is provided in the resampled grid of the CIMR instrument at resolution of the C-band channel, which means it contains 547 samples per scan for each horn. Multiplied by the number of scans for each orbit gives the number of retrieved parameter values per orbit for each geophysical parameter. The output is saved on the EASE2 grid for Northern and Southern hemispheres, EPSG:6931 and EPSG:6932, respectively, in 12.5 km resolution. The product is provided in netCDF format and contains the following variables following the CF conventions:
Variable name |
Unit |
dimensions |
---|---|---|
|
days since 2000-01-01 00:00:00 |
|
|
m s\(^{-1}\) |
1440 x 1440 |
|
kg m\(^{-2}\) |
1440 x 1440 |
|
kg m\(^{-2}\) |
1440 x 1440 |
|
K |
1440 x 1440 |
|
K |
1440 x 1440 |
|
1 |
1440 x 1440 |
|
1 |
1440 x 1440 |
|
m |
1440 x 1440 |
|
m s\(^{-1}\) |
1440 x 1440 |
|
kg m\(^{-2}\) |
1440 x 1440 |
|
kg m\(^{-2}\) |
1440 x 1440 |
|
K |
1440 x 1440 |
|
K |
1440 x 1440 |
|
1 |
1440 x 1440 |
|
1 |
1440 x 1440 |
|
m |
1440 x 1440 |
|
g kg\(^{-1}\) |
1440 x 1440 |
|
g kg\(^{-1}\) |
1440 x 1440 |
|
1 |
1440 x 1440 |
The dimension follow the definition of the original CIMR L1b product.
The quality flag is a 64-bit mask with the following bits:
Bit |
Description |
state |
---|---|---|
0 |
valid solution |
set if valid |
1 |
default solver convergence flag (<50 iterations) |
set if true |
2 |
fallback solver used |
set if true |
3 |
fallback solver converged |
set if fallback solver converged |
4 |
no convergence |
set if true (invalid solution) |
5 |
anomaly detected |
set if true (invalid solution) |
6 |
invalid wind_speed |
set if true |
7 |
invalid total_water_vapor |
set if true |
8 |
invalid cloud_liq_water |
set if true |
9 |
invalid sea_surface_temperature |
set if true |
10 |
invalid ice_surface_temperature |
set if true |
11 |
invalid sea_ice_fraction |
set if true |
12 |
invalid multi_year_ice_fraction |
set if true |
13 |
invalid sea_ice_thickness |
set if true |
14 |
anomaly in residual |
set if true |
15-23 |
Reserved |
|
24 |
anomaly in L-band |
set if true |
25 |
anomaly in C-band |
set if true |
26 |
anomaly in X-band |
set if true |
27 |
anomaly in Ku-band |
set if true |
28 |
anomaly in K-band |
set if true |
29-49 |
Reserved |
|
50 |
Landmask |
set for land (fixed) |
51 |
Ice shelf mask |
set for ice shelf |
52-64 |
Reserved |
Note that the invalid
flags are only set if the corresponding variable is not finite. For non-physical values, this flag is not set.