Changes in South Pacific anthropogenic carbon
Changes in South Pacific anthropogenic carbon
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DOI：
10.1029/2010gb003988
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发表时间：
2011-12
影响因子：
5.2
通讯作者：
J. Waters;F. Millero;C. Sabine
中科院分区：
文献类型：
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作者：
J. Waters;F. Millero;C. Sabine
利用扩展多元线性回归（eMLR）方法，对南太平洋沿着P18纬向线（110°W）和P06纬向线（32°S）的人为CO2变化进行了估算。P18上的人为CO2柱清单的结构与南太平洋中部（150°W）P16的南段相似，但总体增加约5-10 μmol kg−1。P18的人为CO2清单值与P06早期评估的交叉点一致。随后的变化，由于人为CO2的增加，pH值也进行了评估。pH值的变化是由人为CO2的变化决定的，并不反映其他年代际信号的变化。在两条巡航轨迹上，pH值的年均变化为−0.0016 mol kg−1 yr−1。这一数值与北太平洋、夏威夷时代系列和亚热带北大西洋的pH值平均下降值非常一致。人为CO2的吸收率与南太平洋的类似研究在合理的范围内。有证据表明，在南太平洋西部，人为CO2的吸收量更大，这归因于该地区亚热带模式水的形成。
The changes in anthropogenic CO2 are evaluated in the South Pacific, along the meridional line P18 (110°W) and the zonal line P06 (32°S), using the extended multiple linear regression (eMLR) method. The structure of the column inventory of anthropogenic CO2 on P18 is similar to the southern section of P16 in the central South Pacific (150°W), but the overall increase is greater by approximately 5–10 μmol kg−1. The value of the anthropogenic CO2 inventory on P18 is in agreement at the crossover point of an earlier evaluation of P06. Subsequent changes in pH due to the increase in anthropogenic CO2 are also evaluated. The change in pH is determined from the changes in anthropogenic CO2 and do not reflect variability in other decadal signals. For both cruise tracks, the average annual change in pH is −0.0016 mol kg−1 yr−1. This value is in good agreement with the average decrease in pH in the North Pacific, at the Hawaii Times Series and the subtropical North Atlantic. The uptake rates of anthropogenic CO2 are within reasonable agreement with similar studies in the South Pacific. There is evidence for greater uptake of anthropogenic CO2 in the western South Pacific and is attributed to the formation of subtropical Mode Water in the region.