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Multiple processes affecting surface seawater N_2O satura-tion anomalies in tropical oceans and Prydz Bay, Antarc-tica

查看全文 作　　者：CHEN [1,2]Liqi;ZHAN [1,2]Liyang;XU [1,2]Suqing;ZHANG [1,2]Jiexia;ZHANG [1,2]Yuanhui;XU [1,2]Guojie 高影响力作者 机构地区：[1]Key Laboratory of Global Change and Marine-Atmospheric Chemistry,State Oceanic Administration(SOA),Xiamen 361005,China;[2]Third Institute of Oceanography,SOA,Xiamen 361005,China高影响力机构 出　　处：《Advances in Polar Science》索引2012年第23卷第2期,共8页高影响力期刊 基　　金：the National Natural Science Foundation of China (Grant nos.40671062,41106168);the National High Technique Research & Development Program of China (Grant no.2008AA121703);the Ministry of Science and Technology of China (Grant nos.2004DIB5J178,2009DFA22920);the Chinese Arctic and Antarctic Admini-stration (CAA) Cooperation Program (Grant nos.IC2010013,IC2011114,IC201201) 摘　　要：We analyzed the N2O content of surface seawater sampled from Prydz Bay, Antarctica, on a cruise track between 30°S and 30°N during the twenty-second Chinese National Antarctic Research Expedition during austral summer, 2006. The surface water showed an average pN 2 O value of 311.9±7.6 nL·L -1 (14.1±0.4 nmol·L -1 ), which was slightly undersaturated. The air-sea N 2 O flux in the region was -0.3±0.8 μmol·m -2 ·d -1 ; however, N 2 O in the surface water was oversaturated in most stations along the cruise track. Saturation anomalies were greater than 10%, with a maximum of 54.7% being observed at the Equator, followed by 31% at 10°N in the Sulu Sea. The air-sea fluxes at these locations were 12.4 and 4 μmol·m -2 ·d -1 , respectively. Overall, the results indicated that surface water in Prydz Bay was near equilibrium with atmospheric N 2 O, and that ocean waters in lower latitudes acted as a N 2 O source. Physical processes such as stratification, ice-melt water dilution, and solar radiation dominate the factors leading to N 2 O saturation of surface water of Prydz Bay, while biological production and upwelling are primarily responsible for the N 2 O oversaturation of surface water observed in subtropical and tropical regions along the cruise track. 关 键 词：南极普里兹湾 水饱和度 表层海水 热带海洋 N20 异常 N2O排放通量 多进程
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