Cruise 64PE400: Hydrographic survey of the Irminger Sea in July 2015 for the Overturning in the Subpolar North Atlantic Program (OSNAP)

During cruise 64PE400 the OSNAP East moorings, which were deployed in the Irminger Basin in summer 2014 have been recovered, serviced and redeployed. There are 5 moorings in the eastern Irminger Sea in the Irminger Current (IC) maintained by NIOZ, 5 moorings in the Western Irminger Sea in the Deep Western Boundary Current (DWBC) maintained by NOC, and one mooring (LOCO2) in the centre of the Irminger gyre (section 4) maintained by NIOZ. A total of 34 RAFOS floats were released at target depths between 1800 and 2200 m in the eastern and western Irminger Sea as part of the US OSNAP program (see cruise report). The mooring work was complemented with repeat CTD stations on the former WOCE (or current CLIVAR) AR7E repeat section (between roughly 59°N, 31°W and 60°N, 42.5°W) including sampling for salinity and dissolved oxygen (O2) calibration. On the westernmost CTD stations in the East Greenland Current samples for ∂18O and nutrients were also taken.A second short CTD section was carried out on the Greenland shelf slope at approximately 64.5°N. 

During cruise 64PE400 the OSNAP East moorings, which were deployed in the Irminger Basin in summer 2014 have been recovered, serviced and redeployed. There are 5 moorings in the eastern Irminger Sea in the Irminger Current (IC) maintained by NIOZ, 5 moorings in the Western Irminger Sea in the Deep Western Boundary Current (DWBC) maintained by NOC, and one mooring (LOCO2) in the centre of the Irminger gyre (section 4) maintained by NIOZ. A total of 34 RAFOS floats were released at target depths between 1800 and 2200 m in the eastern and western Irminger Sea as part of the US OSNAP program (see cruise report). The mooring work was complemented with repeat CTD stations on the former WOCE (or current CLIVAR) AR7E repeat section (between roughly 59°N, 31°W and 60°N, 42.5°W) including sampling for salinity and dissolved oxygen (O2) calibration. On the westernmost CTD stations in the East Greenland Current samples for ∂18O and nutrients were also taken.A second short CTD section was carried out on the Greenland shelf slope at approximately 64.5°N. 

Disciplines

Physical oceanography

Keywords

CTD, Irminger Sea, hydrography, OSNAP, Pelagia, 64PE400

Location

65N, 58S, -30E, -45W

Devices

A recently (April 2015) calibrated SBE 9/11+ CTD, SN-0942, was used to measure temperature, salinity, and turbidity profiles. The sensors mounted on the CTD were an SBE3 temperature sensor SN-001219, SBE4 conductivity sensor SN-003262, a Digiquatz pressure sensor SN-127486, an SBE43 oxygen sensor SN-0431932, a Wetlab CStar beam transmission meter SN-CST-1406DR with a path length of 25 cm, a Chelsea PAR/irradiance sensor SN-118, and a Chelsea Aqua 3 fluorometer SN-088008. The CTD was mounted in a special rack, which contained 22 Niskin water samplers. Two Niskin water samplers were taken off the rosette to make space for the dual-head LADCP set up (Lowered Acoustic Doppler Current profiler). To control the temperature measurements an SBE35 Deep Ocean Standards thermometer was mounted next to the temperature sensor of the CTD. Reference temperature samples were taken with this when water samples were taken with the Niskin samplers. At every bottle stop the CTD operator waited one minute to allow the bottle to be flushed properly. After the bottle was closed another minute was waited to allow the SBE35 to register temperature. The water from these samplers was sub-sampled for the determination of dissolved oxygen and salinity on most stations and for nutrients and δO18 on the stations near Greenland.

Data

FileSizeFormatProcessingAccess
CTD station 1
79 KoNetCDFProcessed data
CTD station 2
79 KoNetCDFProcessed data
CTD station 3
66 KoNetCDFProcessed data
CTD station 4
74 KoNetCDFProcessed data
CTD station 5
69 KoNetCDFProcessed data
CTD station 6
74 KoNetCDFProcessed data
CTD station 7
59 KoNetCDFProcessed data
CTD station 8
61 KoNetCDFProcessed data
CTD station 9
59 KoNetCDFProcessed data
CTD station 10
60 KoNetCDFProcessed data
CTD station 11
51 KoNetCDFProcessed data
CTD station 12
51 KoNetCDFProcessed data
CTD station 13
42 KoNetCDFProcessed data
CTD station 14
49 KoNetCDFProcessed data
CTD station 15
46 KoNetCDFProcessed data
CTD station 16
43 KoNetCDFProcessed data
CTD station 17
41 KoNetCDFProcessed data
CTD station 18
41 KoNetCDFProcessed data
CTD station 19
49 KoNetCDFProcessed data
CTD station 20
42 KoNetCDFProcessed data
CTD station 21
51 KoNetCDFProcessed data
CTD station 22
51 KoNetCDFProcessed data
CTD station 23
81 KoNetCDFProcessed data
CTD station 24
81 KoNetCDFProcessed data
CTD station 25
81 KoNetCDFProcessed data
CTD station 26
77 KoNetCDFProcessed data
CTD station 27
79 KoNetCDFProcessed data
CTD station 28
77 KoNetCDFProcessed data
CTD station 29
79 KoNetCDFProcessed data
CTD station 30
80 KoNetCDFProcessed data
CTD station 31
73 KoNetCDFProcessed data
CTD station 32
68 KoNetCDFProcessed data
CTD station 33
68 KoNetCDFProcessed data
CTD station 34
60 KoNetCDFProcessed data
CTD station 35
57 KoNetCDFProcessed data
CTD station 36
54 KoNetCDFProcessed data
CTD station 37
52 KoNetCDFProcessed data
CTD station 38
51 KoNetCDFProcessed data
CTD station 39
50 KoNetCDFProcessed data
CTD station 40
49 KoNetCDFProcessed data
CTD station 41
31 KoNetCDFProcessed data
CTD station 42
18 KoNetCDFProcessed data
CTD station 43
41 KoNetCDFProcessed data
CTD station 44
25 KoNetCDFProcessed data
CTD station 45
16 KoNetCDFProcessed data
CTD station 46
17 KoNetCDFProcessed data
CTD station 47
17 KoNetCDFProcessed data
CTD station 48
50 KoNetCDFProcessed data
CTD station 49
55 KoNetCDFProcessed data
CTD station 50
59 KoNetCDFProcessed data
CTD station 51
65 KoNetCDFProcessed data
64PE400 cruise report
3 MoPDF
How to cite
de Jong Marieke, de Steur Laura (2019). Cruise 64PE400: Hydrographic survey of the Irminger Sea in July 2015 for the Overturning in the Subpolar North Atlantic Program (OSNAP). SEANOE. https://doi.org/10.17882/59302

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