Hydrographic data from Endeavor 223 : formation and spreading of the shallow component of the North Atlantic deep western boundary current

Abstract

In March-April, 1991, a 34-day hydrographic cruise aboard R/V Endeavor was undertaken to investigate the formation of the shallow component of the North Atlantic Deep Western Boundary Current (DWBC). Forty-seven stations were occupied, including 4 crossings of the DWBC. Five of the stations comprise a detailed CID/XBT survey taken in the region of a lens of newly ventilated water. Two additional stations were occupied in the central part of the Labrador Sea. Dissolved Oxygen, Nitrate, Nitrite, Phosphate, Silcate, and Chlorofluorocarbons (CFCs) F-11 and F-12 were measured at all stations. F-113 measurements were taken in the latter part of the cruise, and Tritium and Helium were measured at selected stations. An acoustic transport (POGO) float was deployed at each station to measure average velocity directly over the upper 1000-1500 meters. The shipboard Acoustic Doppler Current Profier (ADCP) measured upper layer currents throughout the cruise. Eighty-four XBTs were taken. This report presents vertical profiles and sections of the bottle and CTD data, a vector map of the average POGO currents, and listings of the bottle data. Tritium and Helium data are listed in an appendix.