1.3
Air-sea CO2 exchange across a broad latitude range in the eastern Pacific by eddy covariance
PAPER WITHDRAWN
Scott D. Miller, SUNY, Albany, NY; and M. J. Czikowsky and E. S. Saltzman
We measured the exchange of CO2 between the ocean and atmosphere during a 27-day campaign in the Eastern Pacific in April 2010 using the eddy covariance (EC) technique on the R/V Thompson. The cruise track from Punta Arenas, Chile (54 S) to Seattle, USA (48 N) included colder high-latitude waters with CO2 flux from atmosphere to ocean, warmer tropical waters with CO2 flux from ocean to atmosphere, and a broad range of meteorological conditions with 15-minute averaged wind speeds ranging from near zero to 22 ms-1. In situ measurements of the air-sea CO2 concentration difference allowed for calculation of the piston velocity, k. The complete eddy covariance package was installed on the ship's foremast, and included two sonic anemometers and two (nominally) open-path gas analyzers that were configured as closed-path sensors to reduce sensitivity to ship motion. The sample air stream was dried after passing through the first gas analyzer and before passing through the second analyzer. Data from a broad range of atmospheric and oceanographic conditions, acquired with several different instrument configurations, will be used to assess the accuracy/precision of shipboard air-sea CO2 flux measurements by eddy covariance using these techniques.
Session 1, Air-Sea Flux Estimation and Parameterization: 1. Observations
Monday, 27 September 2010, 10:30 AM-12:00 PM, Capitol AB
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