The annual cycle of gross primary production, net community production, and export efficiency across the North Pacific Ocean
The annual cycle of gross primary production, net community production, and export efficiency across the North Pacific Ocean
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DOI：
10.1002/2015gb005318
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发表时间：
2016-02
影响因子：
5.2
通讯作者：
H. Palevsky;P. Quay;Deirdre Lockwood;D. Nicholson
中科院分区：
文献类型：
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作者：
H. Palevsky;P. Quay;Deirdre Lockwood;D. Nicholson
2008年至2012年，我们测量了北太平洋16条集装箱船的总产氧量（GOP）和净群落生产量（NCP）的三氧同位素和氧/氩溶解气比，作为非孵育的地球化学示踪剂。我们通过构建混合层预算来估计北太平洋盆地（35°N - 50°N, 142°E-125°W）在整个年循环中生物碳输出的速率和效率，该混合层预算考虑了对这些示踪剂的物理和生物影响。在春秋季的生产季节，GOP和NCP在170°E以西的黑潮地区最高，在整个盆地中向东降低。然而，160°W以西深层冬季混合层（>200 m）通风了该季节输出碳的~ 40-90%，而160°W以东混合层<120 m的冬季只有~10%的季节性输出碳被通风。结果表明，尽管西部的年GOP高于东部，但整个流域的年碳输出（固碳）率和效率从160°W以东的2.3±0.3 mol C m−2 yr−1下降到170°E以西的0.5±0.7 mol C m−2 yr−1。现有的时间序列站生产率估计值与我们在北太平洋东部但不包括西部的区域生产率估计值一致。这些结果突出表明，为了准确估计通过海洋生物泵固碳的速率和效率，需要在广阔的空间区域和整个年度周期（包括冬季通风期间）估算生产率。
We measured triple oxygen isotopes and oxygen/argon dissolved gas ratios as nonincubation‐based geochemical tracers of gross oxygen production (GOP) and net community production (NCP) on 16 container ship transects across the North Pacific from 2008 to 2012. We estimate rates and efficiency of biological carbon export throughout the full annual cycle across the North Pacific basin (35°N–50°N, 142°E–125°W) by constructing mixed layer budgets that account for physical and biological influences on these tracers. During the productive season from spring to fall, GOP and NCP are highest in the Kuroshio region west of 170°E and decrease eastward across the basin. However, deep winter mixed layers (>200 m) west of 160°W ventilate ~40–90% of this seasonally exported carbon, while only ~10% of seasonally exported carbon east of 160°W is ventilated in winter where mixed layers are <120 m. As a result, despite higher annual GOP in the west than the east, the annual carbon export (sequestration) rate and efficiency decrease westward across the basin from export of 2.3 ± 0.3 mol C m−2 yr−1 east of 160°W to 0.5 ± 0.7 mol C m−2 yr−1 west of 170°E. Existing productivity rate estimates from time series stations are consistent with our regional productivity rate estimates in the eastern but not western North Pacific. These results highlight the need to estimate productivity rates over broad spatial areas and throughout the full annual cycle including during winter ventilation in order to accurately estimate the rate and efficiency of carbon sequestration via the ocean's biological pump.