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气体交换速率和时间平均尺度对海-气碳通量估计的影响 被引量:3

Influence of air-sea transfer velocity and average timescale on the estimation of air-sea CO_2 flux
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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6h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。 Based on CCMP data, ECMWF wave data and the latest CO2 data, we made an estimation of air-sea CO2 flux by using 2 hi-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, hi-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.
出处 《海洋学报》 CAS CSCD 北大核心 2013年第4期72-79,共8页
基金 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)
关键词 气体交换速率 海-气碳通量 时间平均尺度 gas transfer velocity air-sea CO2 flux average time scale
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