The Northern Circumpolar Soil Carbon Database version 2 (NCSCDv2) provides the spatial framework and the data needed to determine the organic carbon stocks in the soils of the permafrost region. The NCSCD contains many thousand of polygons, with each polygon containing one or more named soils or soil taxa that form the basis for determining the carbon stocks. For more detailed descriptions of the NCSCDv2 please refer to the publications on the NCSCDv2 start page (Hugelius et al., 2013a; 2013b).
Representative pedons for each soil taxa (Eurasia and Greenland) or named soil (Canada and United States) are selected. These pedons contain all the data needed to calculate soil carbon content. The data for the three layers that compose each soil (Canada and United States) are entered into the database and are used to calculate the carbon content of each named soil in the polygon while data from pedons of each soil taxa (Eurasia and Greenland) are used to calculate their carbon contents which are then entered into the database.
The soil organic carbon content (SOCC) was calculated for each of the three layers of each named soil (Canada and United States) and for the representative pedons for each soil taxa (Eurasia and Greenland) using the formula:
where C=organic carbon (% weight), BD=bulk density (g cm-3), T=depth of soil layer (0–300 cm) and CF=coarse fragments and/or ice content (% weight). The SOCC data are then stored in the database to be used for further calculations or to generate carbon content maps. In the vector database the SOCC is given in the unit kg C m-2 while it is given as hg C m-2 in the gridded datasets.
The soil organic carbon mass (SOCM) was then determined by multiplying the SOCC of the specific soil by the area of each such soil component in the polygon. These data provide information on the SOCM of each soil in each permafrost zone in the northern circumpolar region and for the production of SOCM maps. Please note: SOC and AREA Attributes were calculated by projecting each region into an Azimuthal equal area projection relevant to that region. For details regarding the parameters included in the polygon attribute tables of shape files and gridded datasets, please refer to tables in the publications on the NCSCDv2 start page (Hugelius et al., 2013a; 2013b).
Lambert Azimuthal Equal Area Projection
Datum WGS84, Units METERS
| Radius of Sphere of Reference | 6370997.00000 |
| Longitude of Center of Projection | 0° 0' 0.00" |
| Latitude of Center of Projection | 90° 0' 0.00" |
| False Easting | 0.0000 |
| False Northing | 0.0000 |
| DESCRIPTION | ITEM NAME | IN | OUT | TYPE | DEC | |
|---|---|---|---|---|---|---|
| Area of Polygon (m2) | AREA | 4 | 12 | F | 3 | |
| Permimeter (m) | PERIMETER | 4 | 12 | F | 3 | |
| Internal ESRI # | MONGOLIAJAN07# | 4 | 5 | B | - | |
| Internal ESRI ID | MONGOLIAJAN07-ID | 4 | 5 | B | - | |
| Link to original source | Name found in original source i.e SMU/MUID | |||||
| Gelisol % of polygon | GELISOL_PCT | 3 | 3 | I | - | |
| Histosol % of polygon | HISTOSOL_PCT | 3 | 3 | I | - | |
| Mollisol % of polygon | MOLLISOL_PCT | 3 | 3 | I | - | |
| Vertisol % of polygon | VERTISOL_PCT | 3 | 3 | I | - | |
| Aridisol % of polygon | ARIDISOL_PCT | 3 | 3 | I | - | |
| Andisol % of polygon | ANDISOL_PCT | 3 | 3 | I | - | |
| Entisol % of polygon | ENTISOL_PCT | 3 | 3 | I | - | |
| Ultisol % of polygon | ULTISOL_PCT | 3 | 3 | I | - | |
| Spodosol % of polygon | SPODOSOL_PCT | 3 | 3 | I | - | |
| Inceptisol % of polygon | INCEPTISOL_PCT | 3 | 3 | I | - | |
| Alfisol % of polygon | ALFISOL_PCT | 3 | 3 | I | - | |
| Natric soils % of polygon | NATRIC_PCT | 3 | 3 | I | - | |
| Aqu soils % of polygon | AQU_PCT | 3 | 3 | I | - | |
| Water % of polygon | WATER_PCT | 3 | 3 | I | - | |
| Rockland % of polygon | ROCKLAND_PCT | 3 | 3 | I | - | |
| Glacier % of polygon | GLACIER_PCT | 3 | 3 | I | - | |
| Miscellaneous % of polygon | MISC_PCT | 3 | 3 | I | - | |
| Gelisol — Turbel % of polygon | TURBEL_PCT | 3 | 3 | I | - | |
| Gelisol — Orthel % of polygon | ORTHEL_PCT | 3 | 3 | I | - | |
| Gelisol — Histel % of polygon | HISTEL_PCT | 3 | 3 | I | - | |
| Total | TOTAL_PCT | 3 | 3 | I | - | |
| Permafrost extent | EXTENT | 4 | 4 | C | - | |
| Gelisol area (m2) | GE_AREA | 16 | 16 | N | 1 | |
| Alfisol area (m2) | AL_AREA | 16 | 16 | N | 1 | |
| Entisol area (m2) | EN_AREA | 16 | 16 | N | 1 | |
| Inceptisol area (m2) | IN_AREA | 16 | 16 | N | 1 | |
| Spodosol area (m2) | SP_AREA | 16 | 16 | N | 1 | |
| Natric soils area (m2) | NA_AREA | 16 | 16 | N | 1 | |
| Aqu soil area (m2) | AQ_AREA | 16 | 16 | N | 1 | |
| Vertisol area (m2) | VE_AREA | 16 | 16 | N | 1 | |
| Mollisol area (m2) | MO_AREA | 16 | 16 | N | 1 | |
| Histosol area (m2) | HI_AREA | 16 | 16 | N | 1 | |
| Aridisol area (m2) | AR_AREA | 16 | 16 | N | 1 | |
| Andisol area (m2) | AN_AREA | 16 | 16 | N | 1 | |
| Ultisolarea (m2) | UL_AREA | 16 | 16 | N | 1 | |
| Turbel area (m2) | GET_AREA | 16 | 16 | N | 1 | |
| Orthel area (m2) | GEO_AREA | 16 | 16 | N | 1 | |
| Histel area (m2) | GEH_AREA | 16 | 16 | N | 1 | |
| Rockland area (m2) | ROCK_AREA | 16 | 16 | N | 1 | |
| Glacier area (m2) | GLACIER_AREA | 16 | 16 | N | 1 | |
| Miscellaneous area (m2) | MISC_AREA | 16 | 16 | N | 1 | |
| SOCM 30cm depth Gelisol (kg) | GE_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Alfisol (kg) | AL_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Entisol (kg) | EN_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Inceptisol(kg) | IN_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Spodosol(kg) | SP_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Natric (kg) | NA_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Aqu soils(kg) | AQ_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Vertisol (kg) | VE_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Mollisol (kg) | MO_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Histosol (kg) | HI_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Aridisol (kg) | AR_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Andisol (kg) | AN_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Ultisol (kg) | UL_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Turbel (kg) | GET_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Orthel (kg) | GEO_30SOCM | 16 | 16 | N | 1 | |
| SOCM 30cm depth Histel (kg) | GEH_30SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Gelisol (kg) | GE_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Alfisol (kg) | AL_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Entisol (kg) | EN_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Inceptisol (kg) | IN_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Spodosol (kg) | SP_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Natric (kg) | NA_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Aqu (kg) | AQ_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Vertisol (kg) | VE_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Mollisol (kg) | MO_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Histosol (kg) | HI_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Aridisol (kg) | AR_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Andisol (kg) | AN_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Ultisol (kg) | UL_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Turbel (kg) | GET_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Orthel (kg) | GEO_100SOCM | 16 | 16 | N | 1 | |
| SOCM 100cm depth Histel (kg) | GEH_100SOCM | 16 | 16 | N | 1 | |
| SOCC 30cm depth polygon (kg/m2) | SOCC_30CM | 8 | 8 | N | 1 | * |
| SOCC 100cm depth polygon (kg/m2) | SOCC_100CM | 8 | 8 | N | 1 | |
| Soil Area (m2) | SOIL_AREA | 16 | 16 | N | 1 | |
| SOCM 30cm depth polygon (kg) | SOCM_30CM | 16 | 16 | N | 1 | * |
| SOCM 100cm depth polygon (kg) | SOCM_100CM | 16 | 16 | N | 1 |
* SOCC (Soil Organic Carbon Content)
* SOCM (Soil Organic Carbon Mass)