Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Meteor	M91	01.12.2012 - 26.12.2012	SOPRAN	South Pacific Ocean

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Bange Hermann W.	Helmholtz Centre for Ocean Research Kiel (GEOMAR)	Callao	Callao

Ziel der Reise / Objectives of Cruise:

The Meteor cruise M91 was conducted as part of the BMBF funded SOPRAN (Surface Ocean Processes in the Anthropocene) project. It was designed as an integrated process study on the upwelling off Peru in order to assess its importance for the emissions of various climate-relevant atmospheric trace gases and tropospheric chemistry. The major objectives of M91 were (i) to estimate the emissions of traces gases such as N2O, CO2, halocarbons etc. from and deposition of aerosols to the Peruvian upwelling region (ii) to investigate the role of the seasurface microlayer for the exchange of trace gases across the ocean/atmosphere interface (iii) to investigate the role of the coastal upwelling and the oxygen minimum zone off Peru as a sources of trace gases Meteor left the port of Callao on 1 Dec 2012. After steaming north for one day, a CTD/RO test station was performed at 09? 3.61' S, 79? 58.82' W on 02 Dec. 2012. The first W/E transect at 5?S was reached on 3 Dec 2012 where regular station work began. Each station usually consisted of one or two CTD/RO casts followed by a microstructure cast and sampling with the zodiac. A series of transects perpendicular to the coast were occupied while moving from north towards south. In total nine W/E transects (A-G, I, J) and two N/S transects (H and Ia), parallel to the coast, were occupied. Additional to the regular sampling stations, five 24h-stations were performed during the transects D, G, I and J. The work program of the 24h-stations in general included four CTD casts, four microstructure casts and several zodiac sampling trips. Station work was finished on 23 Dec in the evening. After the last station at 15? 22.76' S, 75? 19.91' W Meteor headed towards Callao, where the cruise M91 was finished in the morning of 26 December 2012.

Messungen / Measurements