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The Source and Fate of Primary Production in Relation to Carbon Fluxes on NOAA's Long Line Cruises

Francisco P. Chavez , Reiko P. Michisaki, Kurt R. Buck

N92F : Equatorial Pacific Fall 1992

Seasonal composite of chlorophyll for the Fall, 1992 from the Coastal Zone Color Scanner (CZCS).


Cruise tracks for the Equatorial Pacific 1992 cruise

This cruise supports research funded by the NOAA Office of Global Programs (OGP) and the National Science Foundation (NSF), under the Ocean-Atmosphere Carbon Exchange Study (OACES) and the Joint Global Ocean Flux Study (JGOFS). The goal of the OACES project is to determine the source and sink regions of CO2 in the Equatorial and North Atlantic during the summer. Baseline of total carbon inventory in this region was established such that the uptake rate of atmospheric CO2 can be determined for future cruises. Our contribution to this project was to enhance the observations relevant to climate and global change with measurements of primary and new production in an attempt to quantify the effects of the biological system on the carbon and nitrogen cycle.

This is the second part of the 1992 Equatorial Pacific cruise, the first part took place in the spring. This cruise took place aboard the NOAA R/V DISCOVERER during a 13 week period, from September 8 to December 6, 1992. The cruise tracks and station locations are shown in Figure 1. There were three legs ; the leg 3 occupied 140 and 125W during September, leg 4 occupied 110 and 95W during early November and leg 5 worked the coast of Peru and 95W during late November-early December.

Profiles for chlorophyll and primary productivity (using 13C uptake) were taken at 85 stations using a kevlar line and Go-Flo bottles tripped at six depths in the euphotic zone. Also taken at 85 stations were surface particulate organic carbon (POC) and phytoplankton speciation samples, complete profiles for POC were taken at 20 stations and for phytoplankton speciation at 8 stations.

An underway mapping system was deployed, providing a continuous record of fluorescence, PAR, GPS positions, and nitrate. Data from this cruise was processed by Monterey Bay Aquarium Research Institute (MBARI) and NOAA personnel.

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