Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean

Trends in anthropogenic CO2 in water masses of the Subtropical North Atlantic Ocean
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副热带北大西洋水团中人为二氧化碳的趋势

DOI:
10.1016/j.pocean.2014.11.006
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发表时间:
2015
影响因子:
4.1
通讯作者:
Guallart E
Guallart E
中科院分区:
地球科学1区
文献类型:
--
作者:
Guallart E

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本文研究了北大西洋副热带沿着24.5°N主要水团海洋人为CO2(Cant)储存量的年代际变化。利用1992 - 2011年A05断面5个航次的无机碳测量资料,采用4种方法(ΔC_(max)、TrOCA、φ CT_0、TTD),对Cantt的变化进行了评价。我们发现Cantdistribution和存储之间的协议,获得使用氯氟烃和CO2测量在垂直和水平尺度。Cantdistribution表明,上层的浓度较高,年代际储存率较大,这两个值均随深度而减小。富集程度最高的是中央水团的沉积层,其上部边缘的年平均积累量约为1 μmol kg− 1 yr − 1,下部边缘的年平均积累量为该值的一半。我们检测纬向梯度的累积坎特。这一发现在上层沃茨不太清楚,因为不同方法之间存在较大的差异。根据时间序列台站的数据,在北大西洋副热带环流西部海盆的上层沃茨观察到Cantis的大量积累。在中层和深层,纬向梯度在Cantis存储方法之间更加稳健。当考虑Cantaccumulation的纵向差异时,发现沿着剖面(<0.25 μmol kg− 1 yr −1)的平均储存率要低得多,这一点变得更加明显。特别是,在70°W以西,拉布拉多海水的通风在1000和2500 dbar之间产生了显著的累积速率,高达10.5 μmol kg− 1 yr − 1。如果考虑Cantdistributions的瞬态平稳状态,则检测到北大西洋最深沃茨Cantstorage率的显著双十年趋势,与最近的估计一致。
The variability in the storage of the oceanic anthropogenic CO2(Cant) on decadal timescales is evaluated within the main water masses of the Subtropical North Atlantic along 24.5°N. Inorganic carbon measurements on five cruises of the A05 section are used to assess the changes in Cantbetween 1992 and 2011, using four methods (ΔC∗, TrOCA,φCT0, TTD). We find good agreement between the Cantdistribution and storage obtained using chlorofluorocarbons and CO2measurements in both the vertical and horizontal scales. Cantdistribution shows higher concentrations and greater decadal storage rates in the upper layers with both values decreasing with depth. The greatest enrichment is obserbed in the central water masses, with their upper limb showing a mean annual accumulation of about 1 μmol kg−1yr−1and the lower limb showing, on average, half that value. We detect zonal gradients in the accumulation of Cant. This finding is less clear in the upper waters, where greater variability exists between methods. In accordance with data from time series stations, greater accumulation of Cantis observed in the upper waters of the western basin of the North Atlantic Subtropical Gyre. In intermediate and deep layers, the zonal gradient in the storage of Cantis more robust between methods. The much lower mean storage rates found along the section (<0.25 μmol kg−1yr−1) become more obvious when longitudinal differences in the Cantaccumulation are considered. In particular, west of 70°W the ventilation by the Labrador Sea Water creates a noticeable accumulation rate up to ∼0.5 μmol kg−1yr−1between 1000 and 2500 dbar. If a Transient Stationary State of the Cantdistributions is considered, significant bi-decadal trends in the Cantstorage rates in the deepest North Atlantic waters are detected, in agreement with recent estimations.
DOI: 10.7773/cm.v26i1.573
发表时间: 2000-03
期刊: Ciencias Marinas
影响因子: 0.7
作者:
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发表时间: 2009
期刊: Biogeosciences Discussions
影响因子: --
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发表时间: 2012
影响因子: 2.8
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发表时间: 2008
期刊: Biogeosciences
影响因子: 4.9
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DOI: 10.1016/j.jmarsys.2011.11.023
发表时间: 2012
影响因子: 2.8
作者:
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通讯作者: F. F. Pérèz