Program and Agenda

Abstract

ASSESSING THE INTERNAL CONSISTENCY OF CO2 MEASUREMENTS AT STATION ALOHA

The 25-year seawater CO2 record of the Hawaii Ocean Time-series (HOT) program has been instrumental for elucidating the physical and biogeochemical processes controlling the inorganic carbon system at Station ALOHA. Chemical speciation within the seawater CO2 system is calculated using equilibrium equations and any two of the measurable parameters: dissolved inorganic carbon (DIC), total alkalinity (TA), CO2 fugacity and pH. In the HOT program, we over-determine the system by regularly measuring three of these from the same discrete samples. Here, we evaluate the internal consistency of nearly 2700 concurrent measurements of DIC, TA, and pH. We compare measured pH to values calculated using DIC and TA, and employ different parameterizations of equilibrium constants to see which provides the best fit to our field data. We also explore relationships between the observed goodness of fit and key environmental variables (e.g., time, depth, temperature, salinity). Our analysis is the first of its kind to be conducted across both time and depth at a single location, and it provides important constraints on the interpretation of observed temporal trends in open ocean CO2.

ePoster:

Authors

Sadler, D. W., University of Hawaii, USA, sadler@hawaii.edu

Dore, J. E., Montana State University, USA, jdore@montana.edu

Church, M. J., University of Hawaii, USA, mjchurch@hawaii.edu

Fujieki, L. A., University of Hawaii, USA, lfujieki@hawaii.edu

Karl, D. M., University of Hawaii, USA, dkarl@hawaii.edu

Details

Poster presentation

Session #:049
Date: 2/27/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 2459