A New Metric of the Biological Carbon Pump: Number of Pump Passages and Its Control on Atmospheric pCO2
A New Metric of the Biological Carbon Pump: Number of Pump Passages and Its Control on Atmospheric pCO2
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生物碳泵的新指标：泵通道数及其对大气 pCO2 的控制
DOI：
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发表时间：
2021
影响因子：
5.2
通讯作者：
B. Pasquier
中科院分区：
文献类型：
--
作者：
M. Holzer;Eun;B. Pasquier
我们开发了新颖的本地定义的海洋生物泵效率诊断方法，通过追踪碳在海洋中的整个生命周期（从气体注入到放气）并计算通过软组织和碳酸盐泵的次数。这些诊断表明，生物泵对大气 pCO2 的关键控制是表面上每个溶解的无机碳 (DIC) 分子的生命周期泵通过的平均次数以及再生 DIC 的平均无光封存时间。我们将诊断应用于观测受限的碳循环模型，该模型具有空间变化的化学计量比，并嵌入数据同化的全球海洋环流中。我们发现，对于当今的海洋，给定水块中平均有 44 ± 4% 的 DIC 在一生中至少通过一次软组织泵，大约 4% 至少一次通过碳酸盐泵。对于软组织泵和碳酸盐泵，每个分子的生命周期泵通道的全局平均数（包括零通道的分数）为 N´soft=0.65±0.08 和 N´carb∼0.04。使用理想化扰动来清除从零生物活性（pCO2atm = 493±1 ppmv）到完全表面营养耗尽（pCO2atm = 207±1 ppmv）的一系列状态，我们发现pCO2atm的分数变化主要由软组织泵通道数量的分数变化决定。在表面养分完全耗尽时，在一生中至少一次通过软组织泵的 DIC 平均分数增加到 69 ± 5%，其中 N 软 = 1.6±0.3 。
We develop novel locally defined diagnostics for the efficiency of the ocean's biological pump by tracing carbon throughout its lifetime in the ocean from gas injection to outgassing and counting the number of passages through the soft‐tissue and carbonate pumps. These diagnostics reveal that the biological pump's key controls on atmospheric pCO2 are the mean number of lifetime pump passages per dissolved inorganic carbon (DIC) molecule at the surface and the mean aphotic sequestration time of regenerated DIC. We apply our diagnostics to an observationally constrained carbon‐cycle model that features spatially varying stoichiometric ratios and is embedded in a data‐assimilated global ocean circulation. We find that for the present‐day ocean an average of 44 ± 4% of DIC in a given water parcel makes at least one lifetime passage through the soft tissue pump, and about 4% makes at least one passage through the carbonate pump. The global mean number of lifetime pump passages per molecule, including the fraction with zero passages, is N¯soft=0.65±0.08 and N¯carb∼0.04 for the soft‐tissue and carbonate pumps. Using idealized perturbations to sweep out a sequence of states ranging from zero biological activity ( pCO2atm=493±1 ppmv) to complete surface nutrient depletion ( pCO2atm=207±1 ppmv), we find that fractional changes in pCO2atm are dominated by fractional changes in the number of soft‐tissue pump passages. At complete surface nutrient depletion, the mean fraction of DIC that has at least one lifetime passage through the soft‐tissue pump increases to 69 ± 5% with N¯soft=1.6±0.3 .
影响因子：
16.6
作者：
Roshan S;DeVries T
通讯作者：
DeVries T
影响因子：
3.9
作者：
John, Seth G.;Liang, Hengdi;Taburet, Guillaume
通讯作者：
Taburet, Guillaume