Underway N2O and CO2 measurements in the equatorial Atlantic Ocean

Arevalo-Martinez, Damian L., Beyer, M., Krumbholz, Marita, Piller, Inga, Kock, Annette, Steinhoff, Tobias, Körtzinger, Arne and Bange, Hermann W. (2012) Underway N2O and CO2 measurements in the equatorial Atlantic Ocean [Poster] In: SOLAS Open Science Conference, 07-10.05.2012, Washington State, USA.

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Abstract

A new underway system combining infrared detection and the OA-ICOS technique was coupled to a continuos equilibrator in order to perform highly-resolved measurements of atmospheric and oceanic N2O and CO2 in the equatorial Atlantic Ocean during the SOPRAN cruises MSM 18, legs 2 and 3 (May-July 2011). Seawater measurements agreed with discrete samples and the slight differences are mostly due to uncertainty in the sample collection while steep gradients were crossed. During MSM 18/2 high values of oceanic fCO2 and pN2O with respect to the overlying atmosphere led to positive sea-air differences as large as 70 µatm CO2 and 159 natm N2O. Analysis of similar cross-equatorial sections at different times revealed that the strength of this source increased in association with the onset of equatorial upwelling on early June, when the lowest SST coincide with the highest (positive) ΔfCO2 and ΔpN2O close to 10°W.

Document Type: Conference or Workshop Item (Poster)
Keywords: Marine chemistry; Biogeochemistry
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Physical Chemistry
OceanRep > The Future Ocean - Cluster of Excellence
Projects: Future Ocean
Date Deposited: 26 May 2012 12:42
Last Modified: 04 May 2015 08:03
URI: http://eprints.uni-kiel.de/id/eprint/14297

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