Deployment: KN199-05

Deployment: 
KN199-05
Chief Scientist: 
William J. Jenkins (Woods Hole Oceanographic Institution, WHOI)
Synonyms: 
GT10
USGT-NAT-2010
KN199-5
GNAT
knorr199-4/5
Platform:
Platform Type:
 vessel
Start Date: 
2010-11-08
End Date: 
2010-11-26
Location: 
Subtropical northern Atlantic Ocean
Description

KN199-05 is the completion of the US GEOTRACES Zonal North Atlantic Survey Section cruise originally planned for late Fall 2010 from Lisboa, Portugal to Woods Hole, MA, USA.

4 November 2010 update: Due to engine failure, the science activities scehduled for the KN199-04 cruise were canceled on 2 November 2010. On 4 November the R/V KNORR put in at Porto Grande, Cape Verde (ending KN199 leg 4) and is scheduled to depart November 8, under the direction of Acting Chief Scientist Oliver Wurl of Old Dominion University.  The objective of KN199 leg 5 (KN199-05) is to carry the vessel in transit to Charleston, SC while conducting abbreviated science activities originally planned for KN199-04. The vessel is scheduled to arrive at the port of Charleston, SC, on 26 November 2010. The original cruise was intended to be 55 days duration with arrival in Norfolk, VA on 5 December 2010.

Planned scientific activities and operations area during the KN199 leg 5 (KN199-05) transit will be as follows: the ship's track will cross from the highly productive region off West Africa into the oligotrophic central subtropical gyre waters, then across the western boundary current (Gulf Stream), and into the productive coastal waters of North America. During this transit, underway surface sampling will be done using the towed fish for trace metals, nanomolar nutrients, and arsenic speciation. In addition, a port-side high volume pumping system will be used to acquire samples for radium isotopes. Finally, routine aerosol and rain sampling will be done for trace elements. This section will provide important information regarding atmospheric deposition, surface transport, and transformations of many trace elements.

Science Objectives are to obtain state of the art trace metal and isotope measurements on a suite of samples taken on a mid-latitude zonal transect of the North Atlantic. In particular sampling will target the oxygen minimum zone extending off the west African coast near Mauritania, the TAG hydrothermal field, and the western boundary current system along Line W. In addition, the major biogeochemical provinces of the subtropical North Atlantic will be characterized. For additional information, please refer to the GEOTRACES program Web site (GEOTRACES.org) for overall program objectives and a summary of properties to be measured.

Science Activities include seawater sampling via GoFLO and Niskin carousels, in situ pumping (and filtration), CTDO2 and transmissometer sensors, underway pumped sampling of surface waters, and collection of aerosols and rain.

Hydrography, CTD and nutrient measurements will be supported by the Ocean Data Facility (J. Swift) at Scripps Institution of Oceanography and funded through NSF Facilities. They will be providing an additional CTD rosette system along with nephelometer and LADCP. A trace metal clean Go-Flo Rosette and winch will be provided by the group at Old Dominion University (G. Cutter) along with a towed underway pumping system.

List of cruise participants: [ PDF ]

funding: NSF OCE award 0926423

WHOI cruise planning synopsis

Cruise information and original data are available from the NSF R2R data catalog.

ADCP data are available from the Currents ADCP group at the University of Hawaii: KN199-05 ADCP