冬季北黄海溶解态CH4和N2O的浓度分布及海-气交换通量

臧昆鹏; 霍城; 郑楠; 徐雪梅

doi:10.7524/j.issn.0254-6108.2017111704

冬季北黄海溶解态CH4和N2O的浓度分布及海-气交换通量

1.
中国气象科学研究院, 北京, 100081;
2.
南京信息工程大学, 南京, 210044;
3.
国家海洋环境监测中心, 国家海洋局近岸海域生态环境重点实验室, 大连, 116023
基金项目:
国家自然科学基金（41606123），国家海洋局海洋-大气化学与全球变化重点实验室基金（GCMAC1506）和国家海洋局近岸海域生态环境重点实验室基金（201610）资助.

Distributions and fluxes of dissolved CH4 and N2O in the North Yellow Sea in winter

1.
Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, 100081, China;
2.
Nanjing University of information Science & Technology, Nanjing, 210044, China;
3.
National Marine Environmental Monitoring Center, Key Laboratory of Ecological Environmental in coastal areas(SOA), Dalian, 116023, China
Fund Project: Supported by the National Science Foundation of China (41606123), Key Laboratory of Global Change and Marine-Atmospheric Chemistry, SOA (GCMAC 1506) and Key Laboratory for Ecological Environmental in Coastal Areas, SOA (201610).

摘要: 2014年1月开展了北黄海表层海水中溶解态甲烷（CH4）和氧化亚氮（N2O）浓度及海水温盐等参数的观测研究.结果显示，冬季北黄海表层海水溶解态CH4和N2O的浓度范围分别为4.3—7.3 nmol·L-1和12.8—14.9 nmol·L-1，饱和度范围分别为150%—255%和128%—149%，是大气CH4和N2O的源.通过针对性开展温盐数据校正，区域和全球尺度大气CH4和N2O摩尔分数参考值的对比计算等关键过程的研究，优化提高了溶解态CH4和N2O饱和度及海-气交换通量计算方法和结果的准确度，得出1月份海-气CH4和N2O交换通量分别为6.3±5.1 μmol·m-2·d-1 和9.4±8.0 μmol·m-2·d-1 （W2014）.并结合文献报道的春、夏、秋季节观测结果，将北黄海N2O年释放量修订为1.02×10-2 Tg.
- 北黄海 /
- 甲烷 /
- 氧化亚氮 /
- 海-气交换通量
Abstract: Concentrations of dissolved methane (CH4) and nitrous oxide (N2O) and related parameters in surface seawater of the northern Yellow Sea were monitored in January, 2014. The concentrations of dissolved CH4 and N2O ranged from 4.3 nmol·L-1 to 7.3 nmol·L-1 and 12.8 nmol·L-1 to 14.9 nmol·L-1, respectively. And their saturations ranged from 150% to 255% and 128% to 149%, respectively, suggesting that the North Yellow Sea was a net source of atmospheric CH4 and N2O in winter. Based on the calibration of in-situ seawater temperature and salinity and the study of calculation processes by using the regional and global mean mole fractions of atmospheric CH4 and N2O, the calculation methods of saturation and air-sea flux were optimized for better accuracy. Finally, the air-sea fluxes of CH4 and N2O were 6.3±5.1 μmol·m-2·d-1 and 9.4±8.0 μmol·m-2·d-1, respectively, calculated using the Wannikhof equations of 2014. Combined with the previous research results, the annual N2O emission was recalculated to be 1.02×10-2 Tg.
- North Yellow Sea /
- methane /
- nitrous oxide /
- air-sea flux

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