GIRARD-ARDHUIN, F.5, Bu DT-Ki.<l VER, M.2, BUUS-HINKLER, J.?, DINESSEN, F.°, 
FLEMING, A.', HOYER, J.?, KARVONEN, J.“, SALDO, R.} 
British Antarctic Survey (BAS), United Kingdom - *Danish Meteorological Institute (DMI), Denmark 
Technical University of Denmark (DTU), Denmark - “Finnish Meteorological Institute (FMI), Finland 
ench Institute for Ocean Science (lfremer), Brest, France - Norwegian Meteorological Institute (MET), Norway 
1. OVEPVIEN 
The Copernicus Marine Service Sea Ice Thematic Assembly 
Centre (Sea Ice TAC) provides elaborated operational 
(Level 3 and 4) observational multi-mission sea ice products 
derived from upstream satellite earth observation (L2) 
data. Sea ice products range from operational products 
delivered in Near Real Time (NRT) to timeseries utilizing 
satellites observations since 1979. 
During the period 2015-2021, the Sea lce TAC has expanded 
its portfolio to include: 
individual icebergs detection, 
NRT and multiyear (MY) sea ice thickness in the Arctic, 
-sea ice type based on Sentinel-1 Synthetic Aperture 
Radar (SAR) data, 
automated products such as sea ice concentration In 
the Arctic and Baltic. 
The spatial resolution of several products has increased, 
as well as the coverage. Timeseries for MY products and 
Jcean Monitoring Indicators have been continuously 
extended as near as possible up to the present. Sentinel-2 
and Sentinel-3 have been incorporated in the processing 
chains for ice charts services and used both in the 
production and as part of the validation. 
This article presents the main achievements of the Sea 
Ice TAC, from 2015 to 2021, and perspectives for the 
next years. Since products are based on several different 
algorithms, sensors, and even satellites, these points are 
presented separatelv for each product. 
1.1 Iceberg product 
Iceberg products by DMI are based on target-detection in 
SAR satellite imagerv. The first version of the Copernicus 
(at that time MyOcean) iceberg number-density product 
became operational on 2 April, 2010 and was based or 
SAR imagery from Canadian Radarsat satellites. 
However, when the Sentinel-1 program began (with the 
launches of Sentinel-1A in late 2014 and Sentinel-1B in 
2016) much more SAR imagery became available. This 
was a game changer and led to a dramatic increase in the 
number of available iceberg products. In particular by the 
and of 2016 when both satellites were in orbit and fully 
operational. 
Iceberg number densities are provided in a gridded format 
at 10 km spatial resolution. Each grid cell is associatec 
with the number of icebergs detected within its area. 
10 meet different user needs the iceberg product-line 
today consists of six individual datasets: 
|. single scenes EW (Extra Wide Swath), 
2. single scenes IW (Interferometric Wide Swath). 
3. four-day mosaics EW, 
4. seven-day mosaics IW, 
5. four-day EW mosaics with individual iceberg 
positions, 
5. seven-day IW mosaics with Individual iceberg 
positions. 
"he last two datasets are the most recently developed anc 
came into service in July 2020. They are available in ESR 
Shape file format, which makes them adequate for use and 
display in Geographic Information System (GIS) and are 
>ften used by national ice services and sometimes by sea 
navigators directly onboard their vessels. The GIS allows 
users to visualize their own data as a map. 
Iceberg detection in radar imagery is sometimes connectea 
with significant uncertainty due to high winds (that leads to 
a rough sea state) and other factors affecting the signaı 
Oo noise ratio. Thus, datasets 5 and 6 hold information on 
detection quality (iceberg score and detection significance) 
for each individual iceberag.