Sea ice age distribution for the Arctic for week 22 of the years 1995, 2005, and 2015. Numbers 1, 2, 3, etc. denote first-year ice, i.e. sea ice of the current freezing season, second-year ice (has survived one summer melt season), third-year ice (has survived two summer melt seasons), etc.
This data set is only available for a restricted user group, please contact us if you want to access these data.
RESTRICTED only accessable in CEN/MPI net or via CliSAP login What does that mean?
View data via LAS
Access data via OPeNDAP
Data access via file system: /data/icdc/ice_and_snow/arctic_sea_ice_age
ATTENTION! Due to visualisation reason, seasonal sea ice, i.e. the sea ice of the current winter, is assigned an age of 1 year. This is NOT correct this way. The READING is: first-year sea ice (from the current winter, i.e. is in its first year, therefore = 1), second-year sea ice (has survived on melting season, is in its second year, therefore = 2), third-year sea ice (has survived two melting seasons), and so on.
Coverage, temporal and spatial resolution
Period and temporal resolution:
- 1984-01-01 until 2017-02-25
Coverage and spatial resolution:
- Northern hemisphere
- Spatial resolution: 12.5 km x 12.5 km, EASE-Projection (http://nsidc.org/data/ease/) but a different grid (see Na12500-CF.gpd)
- Geographic longitude: 0°E to 360°E
- Geographic latitude: 48.4°N to 90°N
- Dimension: 721 columns x 721 rows
- Altitude: 0.0 m
The data set does not contain uncertainty estimates. The approach uses weekly values of sea ice concentration and sea ice drift; random uncertainties in these daily products are therefore reduced.
Largest uncertainties can be expected during melt conditions and also in the marginal ice zone when and where both sea ice concentration and drift have the largest uncertainties.
It cannot be excluded that the ice age is - in general - positively biased because of the preferential assignment of the age of the oldest class to the entire grid cell - for concentrations of that oldest class down to 15% at the end of summer.
The maximal age of the sea ice is set to 10 years.
It cannot be excluded that potential inconsistencies in the sea ice drift data set used have an impact on the sea ice age derived. In this context we note, that the sea ice drift data set is based on a heterogeneous mixture of different data sources.
We note that during the first 5 years of the data set the typical distribution of sea ice age classes is not yet fully developed due to the methodology used. It lacks data of the oldest sea ice classes (6-10 years).
For further details and discussion of uncertainties and error sources we refer to the references.
National Snow and Ice Data Centre (NSIDC)
email: nsidc (at) nsidc.org
NASA Goddard Space Flight Center (GSFC)
email: walt.meier (at) nasa.gov
CCAR, University of Colorado, UCB 449, Boulder, CO
email: scottincolorado (at) gmail.com
CCAR, University of Colorado, UCB 431, Boulder, CO
email: mark.tschudi (at) colorado.edu
ICDC / CEN / University of Hamburg
email: stefan.kern (at) uni-hamburg.de