Atmospheric pCO2 sensitivity to the solubility pump: Role of the low‐latitude ocean
Atmospheric pCO2 sensitivity to the solubility pump: Role of the low‐latitude ocean
复制标题
大气 pCO2 对溶解度泵的敏感性：低纬度海洋的作用
DOI：
10.1029/2009gb003537
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发表时间：
2009
影响因子：
5.2
通讯作者：
F. Primeau
中科院分区：
文献类型：
--
作者：
T. DeVries;F. Primeau
先前的研究表明，大气 pCO2 对低纬度海面化学变化的敏感性（“低纬度敏感性”）既取决于低纬度地区通风的海洋体积，也取决于高纬度地区海气不平衡的程度。然而，尚不清楚哪种影响更重要。在本文中，我们提出了一个诊断框架，用于量化低纬度通风与高纬度海气不平衡的相对重要性，以确定海洋碳循环模型的低纬度敏感性。该诊断使用格林函数，根据碳最后与大气相互作用是在低纬度地区还是在高纬度地区来划分海洋碳库存。该诊断适用于简单的三箱模型、带有通风温跃层的箱模型以及一套 OGCM 运行，旨在捕获当前和末次盛冰期条件下的一系列可能的海洋环流。诊断结果明确表明，由于 OGCM 中从低纬度地区排出的水量较多，因此 OGCM 比箱模型具有更高的低纬度敏感性。然而，当应用于 OGCM 运行套件时，诊断还表明，高纬度海气不平衡的影响有时可以主导低纬度通风的影响，并且对海洋环流状态高度敏感。特别是，高纬度不平衡效应的大小与大西洋经向翻转环流的强度和从北部高纬度地区通风的水量密切相关。
Previous research has shown that the atmospheric pCO2 sensitivity to changes in low‐latitude sea‐surface chemistry (“low‐latitude sensitivity”) depends on both the volume of the ocean ventilated from low latitudes and on the degree of air‐sea disequilibrium at high latitudes. However, it is not clear which effect is more important. In this paper we present a diagnostic framework for quantifying the relative importance of low‐latitude ventilation versus high‐latitude air‐sea disequilibrium in determining the low‐latitude sensitivity of ocean carbon cycle models. The diagnostic uses a Green function that partitions the ocean's carbon inventory on the basis of whether the carbon last interacted with the atmosphere in the low latitudes or in the high latitudes. The diagnostic is applied to a simple 3‐box model, a box model with a ventilated thermocline, and a suite of OGCM runs meant to capture a range of possible ocean circulations for present and last‐glacial‐maximum conditions. The diagnostic shows unambiguously that the OGCM has a greater low‐latitude sensitivity than the box models because of the greater amount of water ventilated from low latitudes in the OGCM. However, when applied to the suite of OGCM runs, the diagnostic also reveals that the effect of high‐latitude air‐sea disequilibrium can sometimes dominate the effect of low‐latitude ventilation and is highly sensitive to the state of the ocean circulation. In particular, the magnitude of the high‐latitude disequilibrium effect correlates strongly with the strength of the Atlantic meridional overturning circulation and the volume of water ventilated from northern high latitudes.
影响因子：
18.3
作者：
P. Goodwin;Richard G. Williams;A. Ridgwell;M. Follows
通讯作者：
P. Goodwin;Richard G. Williams;A. Ridgwell;M. Follows
影响因子：
5.2
作者：
P. Goodwin;M. Follows;Richard G. Williams
通讯作者：
P. Goodwin;M. Follows;Richard G. Williams