摘要
2008年4月在三亚河设置24h观测连续站,10月在三亚湾设置13个采样站,同时采集大气、表层和底层海水样品,运用静态顶空气相色谱法对海水中溶存N2O的浓度进行了测定。结果表明,三亚湾海水中溶存N2O的浓度范围为7.57—15.04nmol/L,饱和度范围为101.8%—202.2%,均处于过饱和状态,明显受到三亚河水人为污染的影响;三亚河N2O浓度日变化范围在12.7—17.6nmol/L,饱和度范围在170.9%—236.9%,全天也均处于高度过饱和状态,表明三亚河和三亚湾都是大气N2O的源。对三亚河和三亚湾N2O浓度与盐度,营养盐的关系进行相关分析可得,其与盐度之间的关系为负相关,与硝酸盐,亚硝酸盐,氨盐的关系为正相关。此外还利用Liss提出的双层模型计算了三亚河和三亚湾的N2O海-气交换通量,分别为5.71—11.63μmol/(m2·d)、0.33—8.26μmol/(m2·d),表明三亚河与三亚湾水体中N2O的过饱和现象主要来源于城市污水的影响。
Nitrous oxide is one of the green house gases. The concentrations of dissolved nitrous oxide in Sanya River and Sanya Bay were investigated with static head space gas-chromatography in April 2008 and October 2008, respectively. The results showed that the daily N20 concentrations in Sanya River ranged from 12.7 to 17.6nmol/L, with saturation range from 170.9% to 236.9%; and daily N20 concentrations in Sanya Bay ranged from 7.57 to 15.04nmol/L, with saturation range from 101.8% to 202.2%. Therefore, the two areas were origins of atmospheric N2o. Moreover, N2o concentrations distributed homogeneously in the central part of Sanya Bay but were higher in the nearshore areas that close to human inhabitancy （e.g. the highest concentrations appeared in the estuary and port）. Furthermore, there was a notable positive correlation between N2O concentrations and concentrations of the nitrate, nitrite and ammonium salts, and a negative correlation between N2O concentrations and the salinities in seawater. In addition, the air-sea flux of NaO ranged from 5.71 to 11.63μmol/（mE-d） in Sanya River, and ranged from 0.33 to 8.26p.mol/（mE.d） in Sanya Bay, which were calculated based on the Liss and Merlivat double deck model.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2010年第2期266-273,共8页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金资助项目
40676073号
国家公益性项目海洋行业专项资助
2008.7-2010.7
关键词
三亚河
三亚湾
氧化亚氮
分布
通量
影响因素
Sanya River, Sanya Bay, Nitrous oxide, Distribution, Flux, Influencing factors
