Decadal increases of anthropogenic CO2 in the South Pacific subtropical ocean along 32°S
Decadal increases of anthropogenic CO2 in the South Pacific subtropical ocean along 32°S
复制标题
南太平洋副热带海洋沿南纬 32° 的人为二氧化碳逐年增加
DOI：
10.1029/2005jc003405
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发表时间：
2007
影响因子：
--
通讯作者：
M. Fukasawa
中科院分区：
文献类型：
--
作者：
A. Murata;Y. Kumamoto;S. Watanabe;M. Fukasawa
为了估计海洋中人为CO2的年代际增长，利用世界海洋环流实验（WOCE）水文计划（WHP） P6剖面上间隔10年的数据，研究了经表观氧利用和盐度校正的溶解无机碳（CT）分布。在1500 m （= 27.5σθ）水深以下，nCTCAL显著增加，在1500 m （= 27.5σθ）水深以上存在亚南极模态水（SAMW）和南极中间水（AAIW）。160°W东侧等径面（26.6 ~ 26.9σθ） nCTCAL的年代际变化幅度大于160°W西侧（5 ~ 8 μmol kg−1），而等径面（27.0 ~ 27.5σθ） AAIW的年代际变化幅度基本不变。SAMW和AAIW的nCTCAL平均增加量分别为10±3.1和4.1±2.0 μmol kg−1。在经度180°~ 160°W、水深大于3500 m的深海中，nCTCAL和盐度归一化CT （nCT）也出现了小而显著的增加（分别约为3.0和5.0 μmol kg−1），与环极深水相对应。从水质量分布的角度讨论了人为CO2积累的空间差异。估计南太平洋副热带海洋人为CO2增加的水柱存量为1.0±0.4 mol m−2 yr−1，与以往报道的结果基本一致。
[1] To estimate decadal increases of anthropogenic CO2 in the ocean, distributions of dissolved inorganic carbon (CT) corrected by apparent oxygen utilization and salinity (nCTANT) were investigated along the World Ocean Circulation Experiment (WOCE Hydrographic Programme (WHP)) P6 section based on data obtained 10 years apart. Significant increases of nCTCAL were detected down to 1500 m (≅27.5σθ) water depth, above which the Sub-Antarctic Mode Water (SAMW) and the Antarctic Intermediate Water (AAIW) are found. The decadal increases of nCTCAL on the isopycnal surfaces (26.6–26.9σθ) of SAMW were higher (5–8 μmol kg−1) to the east of 160°W than to the west of it, while the increases in AAIW were almost constant on the isopycnal surfaces (27.0–27.5σθ). The averaged increases of nCTCAL in SAMW and AAIW were 10 ± 3.1 and 4.1 ± 2.0 μmol kg−1, respectively. Small but significant increases of nCTCAL and salinity-normalized CT (nCT) were also found (approximately 3.0 and 5.0 μmol kg−1, respectively) in abyssal waters occupying depths greater than 3500 m at longitude 180°–160°W, which correspond to Circumpolar Deep Water. Spatial differences of anthropogenic CO2 accumulation are discussed in terms of water mass distributions. The water column inventory of increases of anthropogenic CO2 in the South Pacific subtropical ocean was estimated to be 1.0 ± 0.4 mol m−2 yr−1, which is almost the same as that previously reported.