Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Meteor	M83-1	13.10.2010 - 14.11.2010		Tropical NE Atlantic Tropical NW Atlantic

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Visbeck Martin	Leibniz-Institut fur Meereswissenschaften an der Universitat Kiel	Las Palmas	Mindelo	Karte Map

Ziel der Reise / Objectives of Cruise:

During leg M83/1 a combined chemical, physical and biological oceanographic research expedition took place in northeastern tropical Atlantic to better understanding the variability of tropical oxygen minimum zones within the framework of the Kiel based SFB 754 (Climate - Biogeochemical interactions in the tropical Oceans). The main goal of the leg M83/1 is to resurvey the purposeful tracer release patch about 2.5 years after its injection in April 2008 at 8?N 23?W. Secondary objectives include water mass variability and oxygen/nutrient/transient tracer distributions in the survey region. Thirdly several aspects of the biogeochemical cycles in conjunction with oxygen minimum zones are investigated. The cruise will also help to delineate water mass transport pathways within the shallow subtropical cell with a particular focus on the exchanges between the Guinea upwelling region and the tropical ocean interior. October 14-17: Left Las Palmas on time and embarked on three day transit to the Cape Verde Islands with echo sounder tests and CTD / GO-FLO trial enroute. Arrived at 17?39'N 24?15'W (TENATSO) close to midnight and sampled with CTD, GO-FLO, Microstructre profiles until October 18 at 12:30 pm. On October 19 Mr. Aase and Mr. Eriksen left METEOR in Praia. October 18-21: Performed a CTD survey section along 15?N between 23?W and 17?30W on the shelf near Dakar. There the 12 parallel mesocosm experiments were started with surface water October 22-23: After a GO-FLO cast from the shelf at 12?30'N 17?37'W we began a short section towards the west until 21?W. October 23-25: Embarked on a southward section along 21?W from 13?N until 9?N. On October 24 we released a microstructure glider at 10?30'N and 21?W to be picked up later. October 25-26: Turned east along 10?N 20?W to the easternmost station of the cruise at 17?W and 450m water depth with full sampling including GO-FLO. October 27-30: After transit to 9?N 15?W on the shelf of Guinea embarked on the nominal 8?N section towards the west until 26?W. During the section we recovered a glider on October 29: near 23?W, which had spent 80 days at sea and set the record for our longest mission of a SLOCUM glider. October 31-November 2: We began a northward section at 6?N along 28?W with a 60 nm station spacing until we reached 11?N. November 3-4: Eastward transect along 10?N. During the morning of November 4 at 9?30N 21?50W we recovered the micro-structure glider during perfect weather conditions. A detailed inspection revealed that water had entered into the micro-rider pressure case. However we were able to obtain 5 days of micro structure data before the leak occurred. November 4-7: Continued the southern part of the 21?W section down to 3?N with a small eastward D-tour until 19?W including a deep CTD cast to the bottom in 4600m deep water. November 8: Reached at 5:00 am the southernmost station at 2?N and performed full sampling including the last GO-FLO station. November 8-12: Embarked on our last CTD section heading north with the final tracer sampling at 13?N and the last CTD cast at 14?N 23?W. From there transit to the port of departure in Mindelo on 13 November.

Messungen / Measurements

Verankerungen / Moorings