Mesoscale biogeochemical responses to iron fertilization in the upper layers of the Southern Ocean Iron Experiment areas
Mesoscale biogeochemical responses to iron fertilization in the upper layers of the Southern Ocean Iron Experiment areas
复制标题
南大洋铁实验区上层铁施肥的中尺度生物地球化学响应
DOI：
10.1029/2011jc006956
复制
发表时间：
2012
影响因子：
--
通讯作者：
Taro Takahashi
中科院分区：
文献类型：
--
作者：
B. Hales;Taro Takahashi
[1]在2002年1月至2月的南大洋铁实验期间，在南(66.45°S，171.8°W)和北(56.23°S，172°W)斑块上进行了两次铁肥试验。南部斑块充满了所有的常量营养素，而北部斑块几乎耗尽了硅酸盐。利用拖曳水样/测量系统，在南部和北部斑块初始加铁后10d和28d，分别获得了高分辨率的温度、盐度、CO2分压(PCO2)和100m上层总CO2、硝酸盐、磷酸盐和硅酸盐的浓度的高分辨率三维观测。由于风事件限制了受精后早期的生物反应，在南部斑块观察到的TCO2和养分下降很小。在北部地区，下降信号较强，这是由于自受精以来的时间较长所致。北面的斑块沿着两个不同水域之间的锋区分散，密度较大的被淹没在打火机下面。俯冲限制了空气中二氧化碳的吸收，但为垂直碳出口提供了替代机制。根据生物地球化学下降和已发表的对非肥水进入斑块的速率的估计，28天的平均净群落生产力为94�12�Carbon m�2 d�1，其中大气到海洋的通量仅占2%。尽管硅酸盐浓度较低，而且北部地区硅化浮游生物的生长可能受到限制，但我们对增强的碳吸收的估计与较高硅酸盐环境的估计类似。引用：Hales，B.和T.T.Takahashi(2012)，南大洋铁实验区上层铁肥的中尺度生物地球化学反应，J.地球物理。第117，C01018，DOI：10.1029/2011JC006956。
[1] During the Southern Ocean Iron Experiment (SOFeX), January–February 2002, two iron fertilization experiments were conducted at the south (66.45°S, 171.8°W) and north (56.23°S, 172°W) patches. The south patch was replete with all macronutrients, whereas the north patch was nearly depleted of silicate. Using a towed water sampling/ measurement system, high resolution three-dimensional observations of temperature, salinity, CO2 partial pressure (pCO2) and the concentrations of total CO2 (TCO2), nitrate, phosphate and silicate in the upper 100 m were obtained 10 and 28 days after initial iron additions in the south and north patches, respectively. TCO2 and nutrient drawdowns observed in the south patch were small due to wind events that limited biological response in the early postfertilization period. At the north patch, drawdown signals were stronger, resulting from the longer time since fertilization. The north patch was dispersed along a frontal zone between two distinct waters, with the denser subducted under the lighter. Subduction limited CO2 uptake from the air, but provided alternative mechanisms for vertical carbon export. Based on the biogeochemical drawdowns and published estimates of the rate of the entrainment of nonfertilized waters into the patch, the mean net community productivity over 28 days was estimated to be 94 � 12 mmol carbon m � 2 day � 1 , to which the air-to-sea flux contributed only 2%. Despite low silicate concentrations and potential limitation of growth of silicifying plankton in the north patch, our estimates of the enhanced carbon uptake are similar to estimates from higher silicate environments. Citation: Hales, B., and T. Takahashi (2012), Mesoscale biogeochemical responses to iron fertilization in the upper layers of the Southern Ocean Iron Experiment areas, J. Geophys. Res., 117, C01018, doi:10.1029/2011JC006956.
DOI：
10.1016/j.dsr2.2008.12.009
发表时间：
2009-04-01
影响因子：
3
作者：
Takahashi, Taro;Sutherland, Stewart C.;de Baar, Hein J. W.
通讯作者：
de Baar, Hein J. W.
影响因子：
56.9
作者：
A. Tsuda;S. Takeda;H. Saito;J. Nishioka;Y. Nojiri;I. Kudo;H. Kiyosawa;A. Shiomoto;K. Imai;T. Ono;A. Shimamoto;D. Tsumune;T. Yoshimura;T. Aono;A. Hinuma;Masatoshi Kinugasa;Koji Suzuki;Y. Sohrin;Yoshifumi Noiri;H. Tani;Y. Deguchi;N. Tsurushima;H. Ogawa;K. Fukami;K. Kuma;T. Saino
通讯作者：
A. Tsuda;S. Takeda;H. Saito;J. Nishioka;Y. Nojiri;I. Kudo;H. Kiyosawa;A. Shiomoto;K. Imai;T. Ono;A. Shimamoto;D. Tsumune;T. Yoshimura;T. Aono;A. Hinuma;Masatoshi Kinugasa;Koji Suzuki;Y. Sohrin;Yoshifumi Noiri;H. Tani;Y. Deguchi;N. Tsurushima;H. Ogawa;K. Fukami;K. Kuma;T. Saino