气体交换速率和时间平均尺度对海-气碳通量估计的影响

宋朝阳; 赵栋梁; 张宇铭

doi:10.3969/j.issn.0253-4193.2013.04.009

气体交换速率和时间平均尺度对海-气碳通量估计的影响

doi: 10.3969/j.issn.0253-4193.2013.04.009

1.
中国海洋大学物理海洋教育部重点实验室, 山东青岛 266100
2.
国家海洋环境监测中心, 辽宁大连 116023

基金项目: 国家重点基础研究发展计划973项目(2009CB421201); 国家自然科学基金项目(41076007)。

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出版历程
- 收稿日期: 2012-05-07
- 修回日期: 2012-09-01

Influence of air-sea transfer velocity and average timescale on the estimation of air-sea CO₂ flux

1.
Key Laboratory of Physical Ocenography Ministry of Education, Ocean University of China, Qingdao 266100, China
2.
National Marine Environmental Monitoring Center, Dalian 116023, China

摘要

摘要: 基于卫星资料建立的CCMP风场、ECMWF波浪和最新CO₂分压数据, 分别用4种以风速为单参数和2种包含海况影响的双参数气体交换速率公式, 估算了全球海-气CO₂通量, 发现前者的结果比后者平均小30%左右, 从整体上看, 与单参数公式相比, 双参数公式使得海洋中CO₂源和汇的强度均明显增强。在此基础上, 讨论了时间平均尺度对海-气CO₂通量估计的影响, 结果表明, 标量平均法比矢量平均具有更好的稳定性, 但依然使得短时间平均比长时间平均得到的CO₂通量值要大, 月平均与6 h平均相比, 单参数公式和双参数公式分别使海洋的净吸收量减少33%和5%, 说明双参数公式具有较好的稳定性。研究还发现, 1988-2009年间, 全球平均风速有增大的趋势, 2006年前后出现一个极大值, 但相应的CO₂年净通量基本保持稳定, 甚至其绝对值有所减小、海洋的吸收能力减弱的倾向。
- 气体交换速率 /
- 海-气碳通量 /
- 时间平均尺度
Abstract: Based on CCMP data, ECMWF wave data and the latest CO₂ data, we made an estimation of air-sea CO₂ flux by using 2 bi-parameter gas transfer velocity formulas and 4 gas transfer velocity formulas parameterized by wind speed. The former result is 30% larger than the latter one. On the whole, bi-parameter formulas strengthen both sink and source of CO₂ in the ocean. Extended research on the influence of average time-scale on estimation of air-sea CO₂ flux was made. Result of scaler averaging method is much more stable than that of vector averaging method.Average global sea wind speed was enlarging during 1988-2009, while the uptake of CO₂ didn't change much.In the past 20 years, the uptake ability of global ocean declined．
- gas transfer velocity /
- air-sea CO₂ flux /
- average time scale

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