Physical Drivers of Phytoplankton Bloom Initiation in the Southern Ocean's Scotia Sea
Physical Drivers of Phytoplankton Bloom Initiation in the Southern Ocean's Scotia Sea
复制标题
南大洋斯科舍海浮游植物大量繁殖的物理驱动因素
DOI:
10.1029/2019jc015162
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Mazloff, Matthew R.
中科院分区:
文献类型:
--
作者:
Prend, Channing J.;Gille, Sarah T.;Talley, Lynne D.;Mitchell, B. Greg;Rosso, Isabella;Mazloff, Matthew R.
The Scotia Sea is the site of one of the largest spring phytoplankton blooms in the Southern Ocean. Past studies suggest that shelf‐iron inputs are responsible for the high productivity in this region, but the physical mechanisms that initiate and sustain the bloom are not well understood. Analysis of profiling float data from 2002 to 2017 shows that the Scotia Sea has an unusually shallow mixed‐layer depth during the transition from winter to spring, allowing the region to support a bloom earlier in the season than elsewhere in the Antarctic Circumpolar Current. We compare these results to the mixed‐layer depth in the 1/6° data‐assimilating Southern Ocean State Estimate and then use the model output to assess the physical balances governing mixed‐layer variability in the region. Results indicate the importance of lateral advection of Weddell Sea surface waters in setting the stratification. A Lagrangian particle release experiment run backward in time suggests that Weddell outflow constitutes 10% of the waters in the upper 200 m of the water column in the bloom region. This dense Weddell water subducts below the surface waters in the Scotia Sea, establishing a sharp subsurface density contrast that cannot be overcome by wintertime convection. Profiling float trajectories are consistent with the formation of Taylor columns over the region's complex bathymetry, which may also contribute to the unique stratification. Furthermore, biogeochemical measurements from 2016 and 2017 bloom events suggest that vertical exchange associated with this Taylor column enhances productivity by delivering nutrients to the euphotic zone.
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影响因子:
3.7
作者:
H. Huppert
通讯作者:
H. Huppert
影响因子:
4.9
作者:
Cerovecki, Ivana;Meijers, Andrew J. S.;Holland, Paul R.
通讯作者:
Holland, Paul R.
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
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D. Bone
影响因子:
3.5
作者:
Youngs M
通讯作者:
Youngs M
影响因子:
3.7
作者:
Graff, Jason R.;Behrenfeld, Michael J.
通讯作者:
Behrenfeld, Michael J.