CIS: Central Irminger Sea

Multidisciplinary mooring, located in the Central Irminger Sea, Subpolar North Atlantic and part of the FP7 NACLIM project. The site is located in the centre of the Irminger Gyre, characterized by particular deep winter mixed layer depth. The mixed layer deepening is promoted through the combination of the cyclonic circulation of the Irminger gyre and strong surface buoyancy forcing in winter. Focus of the interdisciplinary research is on the biogeochemical cycling in a potential deep water formtion area. The physical background field (Temperature, Salinity, Currents) of the upper 1500m is surveyed with a number of sensors. Moreover, biogeochemical sensors (O2, Chl-a, zooplankton) is measured in mixed layer. The site area is shared with the LOCO mooring established by the NIOZ in 2002. The sampling and logistics of the moorings is coordinated with the NACLIM project. In Septmber 2014 the CIS observatory was moved little south and the original position is now occupied by the 4 mooring construction as part of the US OOI initiative. With this configuration one observatory (OOI) is located at the center of the gyre, while CIS and LOCO are where typically the strongest buoyancy focring is found (related to the Greenland Tip Jet).

Infrastructure Location

Study Area

Location Central Irminger Sea
Distance from Land 200 km
Max Depth 3000 m
Oceanographic features of area Cyclonic circulation, strong buoyancy forcing, small scale forcing (Greenland Tip Jet), under the influence of the North Atlantic spring bloom.
Relevant publications isi journals
Relevant publications proceedings published in the context of conference

Status / Maintenance

System Status Operational Planned Frequency 24 month(s)
Platform Required Deep Sea Research Vessel People Involved 4
Duration of Operations 3 day(s) Cleaning Yes
Replacments Yes Download Data Yes

Data Information

Final data output format NetCDF Data Quality Check Yes
Type of quality check on real-time/near-real time data Automatic Real Time – Data availability target 4 hours
Type of Quality check on delayed mode data Manual Delayed Mode – Data availability target 2 years
Own data management Yes Type of use of data Data assimilation Research
Data Management Link
GEOSS URN urn:geoss:csr:resource:urn:uuid:d71d0729-96c9-539e-7103-b058d85e88bf


Avaliable for TNA No
Prefered time period for TNA
TNA Support offered
Services Available
Potential Additional Uses
Data Ports -
Availability of External Power
Instrument installation methodology
Data History
Instrument installation methodology -
Observatory maintenance estimated or planned schedules July 2014 (Maria S. Merian cruise MSM 40, PI: Johannes Karstensen, GEOMAR )
Summer 2016
Data policy and access Real time data is avaialble from Coriolis website
QC data on request from PI
Additional comments
Modality of access


Deployed Planned
Instrument/Sensor Type Parameter(s) Air Temperature, COND, CTD, Currents, DOXY
Platform Buoy Manufacturer
Instrument/Sensor documentation (URL)
Sensor Type / Model Power Supply
Approximate Depth / Height Sampling interval
Calibration Samples Available Yes Frequency of Calibration Samples
Intercalibration Available Yes Intercalibration Platform
Intercalibration Frequency
Solution Adopted
Datasheet URL