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根据2005年3月、2006年4月和8月、2007年4月和10月对北黄海进行的大面调查,分析研究了不同季节表层海水中溶解氧化亚氮(N2O)的水平分布及海-气交换通量.结果表明,北黄海海水中溶解N2O浓度的季节变化不大(约为12nmol.L-1),但其饱和度呈现明显的季节变化,夏、秋季远高于春季,并且春季3个航次表层海水中溶解的N2O随水温的升高由不饱和逐渐转变为过饱和,相关性分析显示,温度是影响溶解N2O饱和度的主要因素.利用Liss和Merlivat公式(LM86)以及Wanninkhof公式(W92)分别估算了北黄海春、夏、秋3个季节N2O的海-气交换通量,其平均值分别为(0.6±1.7)、(5.8±8.4)、(7.9±8.2)μmol.(m2.d)-1和(1.1±2.7)、(10.2±13.6)、(13.8±14.3)μmol.(m2.d)-1,呈现明显的季节性变化,夏、秋两季高于春季.根据北黄海3个季节的平均N2O海-气交换通量和北黄海的面积,初步估算出北黄海N2O的年释放量为(5.3×10-3~9.2×10-3)Tg.a-1,表明北黄海海域是大气N2O的净源.
Based on the surveys conducted in March 2005, April and August 2006, April and October 2007 on the North Yellow Sea, the distribution of dissolved nitrous oxide (N2O) in the surface seawater in different seasons and the sea - gas exchange flux.The results showed that the seasonal variation of dissolved N2O concentration in the North Yellow Sea was not significant (about 12nmol.L-1), but the seasonal variation of the N2O concentration showed obvious seasonal changes, with much higher in summer and autumn than in spring The N2O dissolved in surface seawater changed gradually from unsaturated to supersaturated with the increase of water temperature during the three voyages in spring, and the correlation analysis showed that temperature was the main factor affecting the saturation of dissolved N2O.The Liss and Merlivat formula (LM86) and Wanninkhof (W92) were used to estimate the sea-air exchange fluxes of N2O in the spring, summer and autumn of the North Yellow Sea, respectively. The average values of N2O flux were (0.6 ± 1.7), (5.8 ± 8.4) and (7.9 ± 8.2) μmol, respectively. (m2.d) -1 and (1.1 ± 2.7), (10.2 ± 13.6) and (13.8 ± 14.3) μmol. (m2.d) -1, respectively, showing obvious seasonal changes, According to the average N2O sea-air exchange fluxes and the area of the North Yellow Sea in the three seasons of the North Yellow Sea, annual annual N2O emission in the northern Yellow Sea is estimated to be 5.3 × 10-3 ~ 9.2 × 10-3 Tg.a -1, indicating that the northern Yellow Sea is the net source of atmospheric N2O.