Net community production and calcification from 7years of NOAA Station Papa Mooring measurements
Net community production and calcification from 7years of NOAA Station Papa Mooring measurements
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DOI：
10.1002/2015gb005205
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发表时间：
2016-02-01
影响因子：
5.2
通讯作者：
Cronin, Meghan F.
中科院分区：
文献类型：
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作者：
Fassbender, Andrea J.;Sabine, Christopher L.;Cronin, Meghan F.
利用帕帕海洋站(OSP)进行的长达七年的近乎连续的观测，评估了东亚北极太平洋海洋碳循环的驱动因素。使用总碱度和溶解无机碳作为示踪剂的随时间变化的质量平衡方法，对在每一部署年造成混合层碳清单变化的过程进行了定量评估。通过使用两个混合层碳示踪剂，可以分离净群落生产量(NCP)和钙化的影响。结果表明，OSP的年NCP为2.1molCm(-2)yr(-1)，年钙化为0.30.3molCm(-2)yr(-1)。综合这一地区潜在的重大溶解有机碳循环的证据，我们估计颗粒无机碳与颗粒有机碳的比率在0.15至0.25之间。这至少是全球平均水平的两倍，进一步证明了钙化生物在这个地区的碳出口中发挥着重要作用。这些结果，再加上NCP的显著季节性，表明OSP附近的碳循环可能比之前想象的更复杂，并突显了持续观测对生物地球化学循环进行可靠评估的重要性。
Seven years of near-continuous observations from the Ocean Station Papa (OSP) surface mooring were used to evaluate drivers of marine carbon cycling in the eastern subarctic Pacific. Processes contributing to mixed layer carbon inventory changes throughout each deployment year were quantitatively assessed using a time-dependent mass balance approach in which total alkalinity and dissolved inorganic carbon were used as tracers. By using two mixed layer carbon tracers, it was possible to isolate the influences of net community production (NCP) and calcification. Our results indicate that the annual NCP at OSP is 2 1molCm(-2)yr(-1) and the annual calcification is 0.30.3molCm(-2)yr(-1). Piecing together evidence for potentially significant dissolved organic carbon cycling in this region, we estimate a particulate inorganic carbon to particulate organic carbon ratio between 0.15 and 0.25. This is at least double the global average, adding to the growing evidence that calcifying organisms play an important role in carbon export at this location. These results, coupled with significant seasonality in the NCP, suggest that carbon cycling near OSP may be more complex than previously thought and highlight the importance of continuous observations for robust assessments of biogeochemical cycling.