Dissolved oxygen dynamics during a phytoplankton bloom in the Ross Sea polynya
Dissolved oxygen dynamics during a phytoplankton bloom in the Ross Sea polynya
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DOI：
10.1017/s0954102014000881
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发表时间：
2015-02
影响因子：
1.6
通讯作者：
B. Queste;K. Heywood;W. Smith;D. Kaufman;T. Jickells;M. Dinniman
中科院分区：
文献类型：
--
作者：
B. Queste;K. Heywood;W. Smith;D. Kaufman;T. Jickells;M. Dinniman
摘要罗斯海冰间湖是南大洋最具生产力的地区之一。然而，有限的访问和物理和生物过程的高度时空变异性限制了使用传统的海洋学方法来衡量早期季节的初级生产力。2010年12月，来自两个海底滑翔机的高分辨率观测提供了对罗斯海南部冰间湖爆发时间的见解。叶绿素和氧浓度的变化被用来评估水华动态。使用溶解氧与碳的比率，净初级生产力估计在水华期间净自养和异养之间的敏感平衡。这两个滑翔机，在同一时期观察空间上不同的区域，发现净群落生产率为-0.9 0. 7和0.7±0.4 g C m-2 d-1。这种差异突出了生物过程的空间变异性，可能是由于观察到水华的不同阶段造成的。获得准确的初级生产力估计的挑战凸显了增加观测工作的必要性，特别是关注无法使用地面或远程观测解决的地下过程。如果不加强观测努力和采用新兴技术，就不可能确定罗斯海冰间湖的季节性营养平衡，也不可能量化该大陆架在碳输出方面的重要性。
Abstract The Ross Sea polynya is one of the most productive regions in the Southern Ocean. However, limited access and high spatio-temporal variability of physical and biological processes limit the use of conventional oceanographic methods to measure early season primary productivity. High-resolution observations from two Seagliders provide insights into the timing of a bloom in the southern Ross Sea polynya in December 2010. Changes in chlorophyll and oxygen concentrations are used to assess bloom dynamics. Using a ratio of dissolved oxygen to carbon, net primary production is estimated over the duration of the bloom showing a sensitive balance between net autotrophy and heterotrophy. The two gliders, observing spatially distinct regions during the same period, found net community production rates of -0.9±0.7 and 0.7±0.4 g C m-2 d-1. The difference highlights the spatial variability of biological processes and is probably caused by observing different stages of the bloom. The challenge of obtaining accurate primary productivity estimates highlights the need for increased observational efforts, particularly focusing on subsurface processes not resolved using surface or remote observations. Without an increased observational effort and the involvement of emerging technologies, it will not be possible to determine the seasonal trophic balance of the Ross Sea polynya and quantify the shelf’s importance in carbon export.