于2011年3月17日～4月6日对东、黄海海域进行了大面调查,采集了45个站位不同深度的海水样品,对溶解甲烷(CH4)浓度进行了测定,并估算了其海-气交换通量.结果表明,东、黄海表层海水中溶解甲烷的浓度变化范围是2.39～29.67nmol.L-1,底层海...于2011年3月17日～4月6日对东、黄海海域进行了大面调查,采集了45个站位不同深度的海水样品,对溶解甲烷(CH4)浓度进行了测定,并估算了其海-气交换通量.结果表明,东、黄海表层海水中溶解甲烷的浓度变化范围是2.39～29.67nmol.L-1,底层海水中甲烷浓度范围是2.63～30.63 nmol.L-1,底层浓度略高于表层,表明底层水体或沉积物中存在甲烷的源.春季东、黄海海域表、底层溶解甲烷的分布特征基本一致,即从近岸向远海逐渐降低,主要受长江冲淡水输入和黑潮水入侵的影响.春季东、黄海海域表层海水中CH4饱和度为93%～1 038%.利用Liss and Merlivat公式(LM86)、Wanninkhof公式(W92)和现场测定的风速估算出春季东、黄海海域CH4的海-气交换通量分别为(2.85±5.11)μmol.(m2.d)-1和(5.18±9.99)μmol.(m2.d)-1,根据本研究结果和文献数据初步估算出东海和黄海年释放甲烷量分别为7.05×10-2～12.0×10-2Tg.a-1和1.17×10-2～2.20×10-2Tg.a-1.春季东、黄海海域表层海水中CH4均呈过饱和状态,是大气中CH4的净源.展开更多
The authors propose a new "three-layer" conceptual model for the air-sea exchange of organic gases, which includes a dynamic surface microlayer with photochemical and biological processes. A parameterization...The authors propose a new "three-layer" conceptual model for the air-sea exchange of organic gases, which includes a dynamic surface microlayer with photochemical and biological processes. A parameterization of this three-layer model is presented, which was used to calculate the air-sea fluxes of acetone over the Pacific Ocean. The air-sea fluxes of acetone calculated by the three-layer model are in the same direction but possess half the magnitude of the fluxes calculated by the traditional two-layer model in the absence of photochemical and biological processes. However, photochemical and biological processes impacting acetone in the microlayer can greatly vary the calculated fluxes in the three-layer model, even reversing their direction under favorable conditions. Our model may help explain the discrepancies between measured and calculated acetone fluxes in previous studies. More measurements are needed to validate our conceptual model and provide constraints on the model parameters.展开更多
文摘于2011年3月17日～4月6日对东、黄海海域进行了大面调查,采集了45个站位不同深度的海水样品,对溶解甲烷(CH4)浓度进行了测定,并估算了其海-气交换通量.结果表明,东、黄海表层海水中溶解甲烷的浓度变化范围是2.39～29.67nmol.L-1,底层海水中甲烷浓度范围是2.63～30.63 nmol.L-1,底层浓度略高于表层,表明底层水体或沉积物中存在甲烷的源.春季东、黄海海域表、底层溶解甲烷的分布特征基本一致,即从近岸向远海逐渐降低,主要受长江冲淡水输入和黑潮水入侵的影响.春季东、黄海海域表层海水中CH4饱和度为93%～1 038%.利用Liss and Merlivat公式(LM86)、Wanninkhof公式(W92)和现场测定的风速估算出春季东、黄海海域CH4的海-气交换通量分别为(2.85±5.11)μmol.(m2.d)-1和(5.18±9.99)μmol.(m2.d)-1,根据本研究结果和文献数据初步估算出东海和黄海年释放甲烷量分别为7.05×10-2～12.0×10-2Tg.a-1和1.17×10-2～2.20×10-2Tg.a-1.春季东、黄海海域表层海水中CH4均呈过饱和状态,是大气中CH4的净源.
基金funded by the National Natural Science Foundation of China (Grant No. 41222035)
文摘The authors propose a new "three-layer" conceptual model for the air-sea exchange of organic gases, which includes a dynamic surface microlayer with photochemical and biological processes. A parameterization of this three-layer model is presented, which was used to calculate the air-sea fluxes of acetone over the Pacific Ocean. The air-sea fluxes of acetone calculated by the three-layer model are in the same direction but possess half the magnitude of the fluxes calculated by the traditional two-layer model in the absence of photochemical and biological processes. However, photochemical and biological processes impacting acetone in the microlayer can greatly vary the calculated fluxes in the three-layer model, even reversing their direction under favorable conditions. Our model may help explain the discrepancies between measured and calculated acetone fluxes in previous studies. More measurements are needed to validate our conceptual model and provide constraints on the model parameters.
