Aquatic Sciences Meeting, Albuquerque 2001

PC18 Biogeochemical Cycles

Date: Thursday, February 15, 2001

Location: Southwest Hall

Pequignet, A, C, Bermuda Biological Station for Research Inc., St George's, Bermuda, chrispeq@bbsr.edu

Bates, N, R, Bermuda Biological Station for Research Inc., St George's, Bermuda, nick@bbsr.edu

Sabine, C, L, Joint Institute for the Study of Atmosphere and Ocean, University of Washington, Seattle, USA, sabine@pmel.noaa.gov

SPATIAL AND SEASONAL VARIABILITY OF DISSOLVED INORGANIC CARBON IN THE INDIAN OCEAN: IMPLICATIONS FOR AIR-SEA FLUXES OF CO2 AND DEEP OCEAN LYSOCLINE

Understanding the global carbon cycle requires a detailed knowledge of air-sea CO2 fluxes as well as the distribution and variability of inorganic carbon in the ocean interior. In evaluating regional air-sea CO2 fluxes and deep ocean CO2 variability in the Indian Ocean, we used multiple linear regression analyses of data from the WOCE/JGOFS/NOAA CO2 survey to determine the relationships between dissolved inorganic carbon (DIC), total alkalinity (TA), and other biogeochemical and hydrographic (e.g., nutrients, dissolved oxygen, temperature, salinity) parameters. The regressions were applied to the World Atlas 98 data to generate monthly maps of DIC and TA. The other CO2 parameters were computed, using the carbonate dissociation constants of Mehrbach et al. (1973) as refit by Dickson and Millero (1987) using a program developed by Lewis and Wallace (1998). We produce monthly maps of DIC, TA, pCO2, air-sea CO2 flux, and the saturation state of the waters with various CaCO3 minerals. These maps are used to demonstrate seasonal variability in upper ocean inorganic carbon and air-sea CO2 fluxes, and regional variability of deep ocean CaCO3 saturation states.

This Session Listing

Aquatic Sciences Meeting, Albuquerque 2001

Quicklinks