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Multiple processes affecting surface seawater N2O saturation anomalies in tropical oceans and Prydz Bay, Antarctica

【标题】Multiple processes affecting surface seawater N2O saturation anomalies in tropical oceans and Prydz Bay, Antarctica

【Title】Multiple processes affecting surface seawater N2O saturation anomalies in tropical oceans and Prydz Bay, Antarctica

【作者】 陈立奇; 詹力扬; 许苏清; 张介霞; 张远辉

【Author】 Chen Liqi ; Zhan Liyang ; Xu Suqing ; Zhang Jiexia ; Zhang Yuanhui

【期刊】极地研究

【Journal】Advances in Polar Science

【期刊年份】2012

【卷】23

【期】2

【关键词】 dissolved N2O; saturation anomalies; tropic; subtropic; Prydz Bay

【Keywords】 dissolved N2O; saturation anomalies; tropic; subtropic; Prydz Bay

【摘要】 We analyzed the N2O content in surface seawater sampled in Prydz Bay, Antarctica, on a cruise track between 30°S and 30°N during the 22nd Chinese Antarctic Research Expedition during austral summer, 2006. The surface water showed an average pN2O value of 311.9±7.6 nL/L (14.1±0.4 nmol/L), being slightly undersaturated; the air-sea N2O flux of this region was -0.3±0.8 μmol/(m2?d). However, N2O in the surface water was oversaturated in most stations along the cruise track. Saturation anomalies were above 10%, in maximum of 54.7% found at the Equator, followed by 31% at 10°N in the Sulu Sea; in other words, the air-sea fluxes at these locations were 12.4 and 4 μmol/(m2?d), respectively. Therefore, we believe that the surface water in Prydz Bay was near equilibrium with atmospheric N2O, and ocean waters in lower latitudes acted as a N2O source. Physical processes, such as stratification, ice-melt water dilution, and solar radiation dominate the N2O saturation in surface water Prydz Bay; While biological production and upwelling in subtropical and tropical regions should responsible for N2O over saturation in Surface water along the cruise track.

【Abstract】 We analyzed the N2O content in surface seawater sampled in Prydz Bay, Antarctica, on a cruise track between 30°S and 30°N during the 22nd Chinese Antarctic Research Expedition during austral summer, 2006. The surface water showed an average pN2O value of 311.9±7.6 nL/L (14.1±0.4 nmol/L), being slightly undersaturated; the air-sea N2O flux of this region was -0.3±0.8 μmol/(m2?d). However, N2O in the surface water was oversaturated in most stations along the cruise track. Saturation anomalies were above 10%, in maximum of 54.7% found at the Equator, followed by 31% at 10°N in the Sulu Sea; in other words, the air-sea fluxes at these locations were 12.4 and 4 μmol/(m2?d), respectively. Therefore, we believe that the surface water in Prydz Bay was near equilibrium with atmospheric N2O, and ocean waters in lower latitudes acted as a N2O source. Physical processes, such as stratification, ice-melt water dilution, and solar radiation dominate the N2O saturation in surface water Prydz Bay; While biological production and upwelling in subtropical and tropical regions should responsible for N2O over saturation in Surface water along the cruise track.

【基金/项目】

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