NITROUS OXIDE IN THE EASTERN TROPICAL SOUTH PACIFIC OCEAN

Arevalo-Martinez, Damian L., Bange, Hermann W., Kock, Annette, Körtzinger, Arne and Steinhoff, Tobias (2014) NITROUS OXIDE IN THE EASTERN TROPICAL SOUTH PACIFIC OCEAN [Talk] In: Ocean Sciences Meeting 2014, 23.-28.02.2014, Honululu, Hawaii, USA.

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Abstract

Continuous measurements of surface oceanic, and atmospheric nitrous oxide (N2O) were carried out in the eastern tropical South Pacific during the R/V Meteor cruise M91. A novel system based upon off-axis integrated cavity output spectroscopy (OA-ICOS) was used to perform by the first time a detailed survey of surface distributions of this climate relevant gas on the area. Supersaturated waters were found all along the cruise track with values ranging between 109-2350%, from which the highest saturations were observed on the near-coastal area. An offshore-inshore gradient was observed with extremely high seawater N2O concentrations east of 78°W (up to 216 nmol L-1) in consistency with low SST (~14°C) as a result of coastal upwelling off Peru. Analysis of individual sections between 8°-16°S showed also latitudinal differences on the concentration gradients, suggesting the area close to 10.5-12°S as a main site of outgassing to the atmosphere wherein the N2O anomalies were the highest. Our measurements show that the Peruvian upwelling is a significant “hotspot” of N2O emissions which has not been previously taken into account.

Document Type: Conference or Workshop Item (Talk)
Keywords: Nitrous Oxide, Eastern Tropical South Pacific
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754 > B4
OceanRep > SFB 754
Projects: SOPRAN, InGOS, SFB754, Future Ocean
Date Deposited: 04 Mar 2014 08:11
Last Modified: 04 May 2015 07:38
URI: http://eprints.uni-kiel.de/id/eprint/23690

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