| 北黄海溶解氧化亚氮的分布与通量的季节变化 |
| 摘要点击 2565 全文点击 1655 投稿时间：2008-04-07 修订日期：2008-07-30 |
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| 中文关键词 北黄海 氧化亚氮 分布 海-气交换通量 |
| 英文关键词 North Yellow Sea nitrous oxide distribution air-sea flux |
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| 中文摘要 |
| 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12 nmol·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. |
| 英文摘要 |
| The concentrations and air-sea fluxes of dissolved N2O were investigated in the North Yellow Sea during March 2005, April and August 2006, April and October 2007. Seasonal variations of dissolved N2O concentrations（about 12 nmol·L-1）in the North Yellow Sea were not obvious. The saturations of dissolved N2O in the North Yellow Sea showed obvious seasonal variations with higher values occurring in summer and autumn and lower in spring, and the dissolved N2O of the surface water was from undersaturated to oversaturated with the water temperature gradually increasing during three cruises in Spring. The correlation analysis shows that temperature was the main factor to influence N2O saturations. The estimated average N2O fluxes using the Liss and Merlivat (LM86) and Wanninkhof formula（W92）were（0.6±1.7），（5.8±8.4），（7.9±8.2） μmol·(m2·d)-1 and（1.1±2.7），（10.2±13.6），（13.8±14.3） μmol·(m2·d)-1, respectively, for spring, summer and autumn. Air-sea fluxes of dissolved N2O showed obvious seasonal variations, with the N2O fluxes of summer and autumn higher than those of spring. Based on the average annual N2O flux and the area of the North Yellow Sea, the annual N2O emission from the studied area was estimated to be（5.3×10-3-9.2×10-3） Tg·a-1. From the above results, it can be seen that the North Yellow Sea was a net source of atmospheric N2O. |
