Departure: Reykjavík, Iceland, August 9th 2000
Arrival: Reykjavík, Iceland, September 5th 2000
Sveinn Sveinbjörnsson, Chief scientist
John Mortensen, Physical oceanography
Steingrímur Jónsson, Physical oceanography, moorings
Einar Hjöleifsson, 0-group
Þorgrímur Baldursson, 0-group
Albert Stefánsson, 0-group
Gísli Ólafsson, 0-group
Páll Svavarsson, 0-group
Sigurður Gunnarsson, 0-group
Jón Sólmundsson, Sea-bird ecology
Kristján Lilliendahl, Sea-bird ecology
The B10-2000 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 2000 hours on August the 9th 2000 for the B10-2000 cruise.
The vessel headed for the Faxaflói section ( Figure 1) occupying the first nine stations, from there to the Látrabjarg and Kögur sections in the Denmark Strait, where all planned stations were occupied. During these legs an ADCP current meter mooring was deployed at the sill in the Denmark Strait and a current meter mooring was recovered at the continental slope of the Kögur section. The vessel then headed eastwards into North Icelandic waters to the Hornbanki, Húnaflói, Siglunes, Slétta, Langanes NE and Langanes E sections, during which two current meter moorings were serviced at Hornbanki section. From there the vessel headed for the Krossanes, Stokksnes and Selvogsbanki sections and arrived Reykjavik at 1800 hours on September the 5th 2000. During the cruise exceptional good weather was experienced so only a short stop in Patreksfjörður where needed due to weather and call of ports were limited to three planned stops (Ólafsvík, Akureyri and Vopnafjörður) for scientific crew exchanges.
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 second unit (referred to as UNIT B), a SBE 32 rosette equipped with 12 Ocean Test Equipment Inc. 10 liter water samplers, was mainly used on few special stations in relation to chemical sampling. Water samples were collected at deepest sampling level on all stations for calibration purposes of salinity.
Temp. Calibr Cond. Calibr. sensor date sensor date Unit A 2806 04-01-00 2341 31-12-99 Unit B 868 29-01-00 549 01-02-00
All of the goals of the cruise were achieved (see list of stations and cruise track-Figure 1).
The main results of the hydrographic conditions in Icelandic waters in August 2000 were the following (see e.g. T - 50m , S - 50m , T - 100m , S - 100m , and T - botm ):
South and west of Iceland temperatures of the Atlantic water were relatively high (6-11°C) with a warming-up in the surface layer. The salinity in this area was high, as it has been since September 1997 (35.1-35.25) after decades of lower salinities.
The flow of Atlantic water into the area north of Iceland was quite pronounced (5-7°C; S>35.0) and was covered by a relative thin low saline but warm surface layer. The Atlantic water reached as far as the waters off the East Coast of Iceland similar to what was observed in August 1999. As in previous years an intrusion of relative cold (3°C) water from the north was observed in the northwestern part of the survey area.
The surface layers in the northeastern and eastern parts of the survey area were in general characterised by high temperatures (7-9°C) with a sharp thermocline in the depth range 20 to 40 metres. The combined effect of the Atlantic inflow and pronounced heating of the surface layer resulted in that the cold East Icelandic Current was found relative far-off the northeastern coast of Iceland and with high surface temperatures. Salinities of the surface layers east of Iceland were found to be higher than those observed in August 1999 which again was more saline than previous years.
It is concluded that in August 2000, temperatures as well as salinities were relatively high in the survey area with a pronounced heating of the surface layer in general. The hydrographic conditions were in many ways similar to those observed in August 1999.
Preliminary TS-diagrams from the Faxaflói , Látrabjarg , Kögur , Siglunes , Langanes NE , Langanes E , Krossanes , Stokksnes and Selvogsbanki sections show the results above. In addition are preliminary potential temperature and salinity sections shown for Faxaflói (Fig. 3a and Fig. 3b), Látrabjarg (Fig. 4a and Fig. 4b), Kögur (Fig. 5a and Fig. 5b), Hornbanki (Fig. 6a and Fig. 6b), Siglunes (Fig. 7a and Fig. 7b), Slétta (Fig. 8a and Fig. 8b), Langanes NE (Fig. 9a and Fig. 9b), Langanes E (Fig. 10a and Fig. 10b), Krossanes (Fig. 11a and Fig. 11b), Stokksnes (Fig. 12a and Fig. 12b) and Selvogsbanki (Fig. 13a and Fig. 13b) sections respectively.
For location of the above sections 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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