Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO3 profiling floats experiment
Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO3 profiling floats experiment
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DOI：
10.1002/2014gl061020
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发表时间：
2014-09-28
影响因子：
5.2
通讯作者：
Testor, Pierre
中科院分区：
文献类型：
--
作者：
D'Ortenzio, Fabrizio;Lavigne, Heloeise;Testor, Pierre
从2012年夏天到2013年夏天，在地中海西北部部署了两个配置了硝酸盐浓度传感器的剖面花车。提取卫星海洋颜色数据，估算浮标点位的表层叶绿素浓度。对混合层深度、硝酸盐和叶绿素浓度的时间序列进行了分析，以表征该地区物理-化学和生物动态之间的相互作用。深对流(混合层深度>；1000米)在1-2月被观测到，尽管在12月已经可以观测到高硝酸盐表面浓度。虽然只有在3月份才观察到高值，但从12月份开始就观察到了叶绿素的增加。可能是由于该地区持续的气旋式环流，次表层中的早期硝酸盐有效性似乎推动了水华的开始。与深对流事件相关的额外硝酸盐供应，尽管加强了总的硝酸盐吸收，但似乎与12月份叶绿素的增加脱钩。
Two profiling floats, equipped with nitrate concentration sensors were deployed in the northwestern Mediterranean from summer 2012 to summer 2013. Satellite ocean color data were extracted to evaluate surface chlorophyll concentration at float locations. Time series of mixed layer depths and nitrate and chlorophyll concentrations were analyzed to characterize the interplay between the physical-chemical and biological dynamics in the area. Deep convection (mixed layer depth > 1000 m) was observed in January-February, although high-nitrate surface concentrations could be already observed in December. Chlorophyll increase is observed since December, although high values were observed only in March. The early nitrate availability in subsurface layers, which is likely due to the permanent cyclonic circulation of the area, appears to drive the bloom onset. The additional nitrate supply associated to the deep convection events, although strengthening the overall nitrate uptake, seems decoupled of the December increase of chlorophyll.