Beginning with defined key test areas that represents different sea ice regimes, SIMRE provides the basis for a formal and transparent inter comparison of Arctic sea ice mass balance derived from available products guided by open source principles.
Contents of the Products
There are three different types of SIMRE products, based on the ice age (Figure 1). . The files contain seven different sea ice related variables. The variables have dimensions: latitude, longitude, with sizes (29,27) for first year ice example region, (36,28) for multi year ice region and (32,33) for mixed ice region. The file format is NetCDF.
Figure 1. Multi-year ice region inside red polygon, mixed ice region inside orange and first year ice region inside yellow polygon.
The grid used for the reconciled product is the version 2 of the Equal-Area Scalable Earth Grid (EASE2), properties in Table below.
|Projection||Lambert Azimuthal Equal Area|
|Latitude of origin||90.0|
|Longitude of origin||0.0|
|Proj4 string||+proj=laea +lon_0=0 +datum=WGS84 +lat_0=90.0|
|Grid dimensions||(432, 432)|
|Grid cell size||25000.0|
|Grid size||(10800000.0, 10800000.0)|
The product files contain seven variables (in addition to latitude, longitude, time and other CF-related information). There are separate files for each ice type region containing the same variables. The individual monthly datasets of cropped SIMRE grid regions are called ensemble members.
|Variable name||Long name||Standard name||Units|
|longitude||longitude of grid cell center||longitude||Degrees east|
|latitude||latitude of grid cell center||latitude||Degrees north|
|Variable name||Long name||Units|
|mean_thickness||Mean thickness from ensemble members||Meter|
|gmean_thickness||Geometric mean thickness from ensemble members||Meter|
|median_thickness||Median thickness from ensemble members||Meter|
|min_thickness||Minimum thickness of all ensemble members||Meter|
|max_thickness||Maximum thickness of all ensemble members||Meter|
|sdev_thickness||Thickness standard deviation from ensemble members||Meter|
|n_points||Number of ensemble members||1|