Departure: Reykjavík, Iceland, September 1th 1998
Arrival: Reykjavík, Iceland, September 10th 1998
Svend-Aage Malmberg, Chief scientist
Jóhannes Briem, Physical oceanography, moorings
Steingrímur Jónsson, Physical oceanography, moorings
John Mortensen, Physical oceanography
Magnús Danielsen, Chemical oceanography
Ása Kristjansdóttir, Chemical oceanography
The B09-98 cruise was carried out by the Marine Research Institute (MRI) on the RV Bjarni Sæmundsson with the following aims:
The RV Bjarni Sæmundsson left Reykjavík harbor at 2100 hours on the 1th of September 1998 for the B09-98 cruise.
The vessel headed for station 9 on the Faxaflói section, continuing to the ADCP mooring site (DS1) on the Látrabjarg section in the Denmark Strait, where low visibility due to fog made a service impossible. Instead the western leg of the section was occupied with CTD stations. Returning to the ADCP-mooring site visibility was still low, however a window with clear weather was experienced, during which the mooring was successfully serviced. The ship then headed for the Icelandic side of the Kögur section which was occupied with CTD-stations right to the ice-limit. During the approach towards Greenland three current meter moorings were successful serviced (IS6 and IS9) and deployed (IS7). From the Kögur section the vessel headed for and reached the station Siglunes 8. Due to limited time and unfavorable weather forecast a further progress eastwards was not possible. Meaning that the service/rescue of current meter mooring KR4 on the Krossanes section had to be postponed to a later cruise in the area. The mooring which was deployed in June 1997 did not response in June 1998 possibly due to a suggested instrumental failure in the release warned for by the supplier. Instead the ship returned to station Kögur 7 which was occupied as an alternative ESOP station and arrived to Reykjavík at 2200 on September 10th 1998.
Both sections occupied in the Denmark Strait during the cruise are part of the VEINS programme. Locations of the sections are shown in Figure 1 as well as locations of current meter moorings in VEINS tasks 1.4.1 and 1.4.3 (indicated by m).
The hydrographic work was carried out with two independent CTD-water sampling units both equipped with Seabird Inc. SBE 911plus CTD's. The first unit, a MRI made rosette equipped with 12 modified Hydro-Bios 1.7 liter water bottles and a General Oceanics underwater unit, was used for all standard CTD stations. The other unit (referred to as Unit B) comprised of SBE 32 rosette equipped with 12 Go-Flo 8 liter water samplers was used for chemical sampling on ESOP-2 stations. Both units were equipped with newly calibrated temperature and conductivity sensors and water samples were collected at deepest sampling level on all stations for calibration purposes.
Temp. Calibr. Cond. Calibr. sensor date sensor date Unit A 2021 06-08-98 1643 07-08-98 Unit B 943 06-08-98 498 07-08-98
Samples for oxygen measurements were collected in 60 ml bottles,
and Winkler reagents added. Samples were then placed in a dark cold storage until the time of
analysis. Oxygen concentration was determined using a modified Winkler method.
Samples for nutrient analysis, nitrate, phosphate and silicate, were collected on selected stations, in 250 ml polyethylene bottles. Samples were frozen, for later analysis in land on a ChemLab auto-analyzer.
Samples for pCO2 and total carbonate were collected on 4 stations in 500 and 250 ml bottles, preserved with mercury chloride and placed in cold storage.
Samples for delta carbon-13 were collected from the surface at 1 stations and a full profile was collected from 1 station. The samples were preserved with mercury chloride.
Samples for sulfur-hexafluoride (SF6) were collected at 3 stations in 500 ml bottles supplied by the Gothenburg University and placed in cold storage.
Samples for iodine-129 profile were collected at 3 station in 1 liter polyethylene bottles supplied by Centre de Spectrometrie Nucleaire et de Specrometrie de Masse.
During the B09-98 cruise the following current meter moorings were serviced (VEINS task 1.4.1 and 1.4.3).
St.id. Position Water Instr. Type Serial Date Notes Lat. Lon. depth depth no. DS-1 66 04.83N 27 05.98W 649 643 ADCP 75 KHz 1287 040998 recovered DS-1 66 04.87N 27 04.39W 650 643 ADCP 75 KHz 1287 050998 deployed IS-6 68 07.45N 25 16.07W 792 80 Aanderaa RCM7 8744 060998 recovered IS-6 68 07.45N 25 16.07W 792 500 Aanderaa RCM7 9976 060998 recovered IS-9 67 56.00N 24 40.00W 1414 80 Aanderaa RCM7 11987 060998 recovered IS-9 67 56.00N 24 40.00W 1414 500 Aanderaa RCM7 172 060998 recovered IS-9 67 56.00N 24 40.00W 1414 1364 Aanderaa RCM7 12317 060998 recovered IS-9 67 56.12N 24 40.74W 1402 80 Aanderaa RCM7 8743 060998 deployed IS-9 67 56.12N 24 40.74W 1402 300 Aanderaa RCM7 12316 060998 deployed IS-9 67 56.12N 24 40.74W 1402 1350 Aanderaa RCM7 12559 060998 deployed IS-6 68 07.31N 25 15.67W 814 80 Aanderaa RCM7 12315 070998 deployed IS-6 68 07.31N 25 15.67W 814 500 Aanderaa RCM7 7332 070998 deployed IS-6 68 07.31N 25 15.67W 814 764 Aanderaa RCM7 12560 070998 deployed IS-7 67 32.04N 23 44.66W 819 80 Aanderaa RCM7 11987 080998 deployed IS-7 67 32.04N 23 44.66W 819 300 Aanderaa RCM7 9976 080998 deployed IS-7 67 32.04N 23 44.66W 819 750 Aanderaa RCM7 12317 080998 deployed
All the goals of the cruise were achieved (see list of stations and cruise track-Figure 1). The trial for rescue of a mooring east of Iceland (KR-4) deployed in June 1997 had due to time lack to be postponed to a later cruise.
Preliminary inspection of the CTD data showed both in the TS-diagrams from the Látrabjarg and Kögur sections as well as the salinity and temperature sections (see below) the ongoing increase since 1997 compared with recent years indicating favorable inflow of Atlantic water into the North Icelandic coastal area. The fresh water flow in the East Greenland Current was also quite pronounced along with drift-ice off the East Greenland coast to a wider extent than normal for this time of the year, but less so than the previous year (1997). Results of the ADCP mooring of the overflow in the deep channel in the Denmark Strait reveals for the time period September 1996 - September 1998 mean along channel velocities of about 0.5 m/s and temperatures around 0ºC.
Preliminary TS-diagrams from the Látrabjarg and Kögur sections show the results above. In addition are preliminary potential temperature and salinity sections shown for Látrabjarg (Fig. 3a and Fig. 3b) and Kögur (Fig. 4a and Fig. 4b) sections respectively, of which both are part of the VEINS programme. For location of the above sections and mooring sites see Figure 1 and the station numbers.
In case of further information contact:
or by mail:Att. name
Tel. (+354) 55 20240
Fax. (+354) 56 23790
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