Comparison of surface water N2O saturation anomalies between tropical and the Antarctic waters

doi:10.3724/SP.J.1084.2012.00110

Abstract

Abstract: Characteristics of surface water partial pressure of N2O and their saturation anomalies were compared between the tropic waters from 30?N in the Western Pacific to 30?S in East Indian Ocean and the Antarctic waters from the Southern Ocean to Prydz Bay, East Antarctica. Several major factors were analyzed for driving differences of saturation anomalies between the tropic and the Antarctic waters. The surface water pN2O from Prydz Bay was an average of 311.9 ± 7.6 nL/L (14.1 ± 0.4 nM), less unsaturated relative to atmospheric mixing ratio (318.5 nL/L). This instauration would be attributed from melted seaice water being mixed to bring lower pN2O. Air-sea flux of N2O was about -0.3 ± 0.8 μmol m-2d-1. However, N2O saturation anomalies appeared in most tropical surface waters higher than 10% with the maximum of 54.7% found in Equatorial waters and higher of 31% around 10?N in the Sulu sea. Air-sea fluxes were calculated for the tropic waters and Sulu Sea respectively as ?12.4 μmol m-2 d-1 and ~4 μmol m-2 d-1, suggesting that low latitudinal tropical waters would play a significant role as an atmospheric N2O source. This might be caused due to weak air-sea exchange and strong upwelling. However in the high latitudinal Antarctic waters, stratification by melted seaice waters would prevent from upwelling in the Prydz Bay and persistent strong westerly would enhance air-sea exchange rate, especially surface wind would be an important factor to impact air-sea flux of N2O.

Key words: N₂O, Saturation anomalies, Antarctic waters, tropic waters

Chen Liqi，Zhan Liyang，Xu Suqing，Zhang Jiexia，Xu Guojie. Comparison of surface water N₂O saturation anomalies between tropical and the Antarctic waters[J]. ADVANCES IN POLAR SCIENCE, 2012, 24(2): 110-119.

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Comparison of surface water N₂O saturation anomalies between tropical and the Antarctic waters

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