Partitioning of the Open Waters of the Gulf of Mexico Based on the Seasonal and Interannual Variability of Chlorophyll Concentration
Partitioning of the Open Waters of the Gulf of Mexico Based on the Seasonal and Interannual Variability of Chlorophyll Concentration
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DOI：
10.1002/2017jc013456
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发表时间：
2018-04-01
影响因子：
3.6
通讯作者：
Duteil, Olaf
中科院分区：
文献类型：
--
作者：
Damien, Pierre;de Fommervault, Orens Pasqueron;Duteil, Olaf
利用三维物理-地球化学耦合模式研究了墨西哥湾开放沃茨叶绿素的季节和年际变化。由现实的开边界条件，大气强迫和河流淡水排放驱动的5年后报。利用最近的现场观测，可以深入评价模型营养和叶绿素的季节分布，包括叶绿素的垂直结构。我们发现，不同的叶绿素模式的时间变化共存于深盆，从而不能被认为是一个均匀的区域叶绿素动态。根据冬季叶绿素浓度增加的墨西哥湾开放沃茨的分区，然后提出。这种分区基本上是由注入真光层的营养物质的量来解释的，真光层高度受冬季混合层动态的约束。的季节和年际变化似乎受到大气通量和中尺度动力学（特别是环流涡旋）的变化。最后，估计初级生产力在深盆地。
The seasonal and interannual variability of chlorophyll in the Gulf of Mexico open waters is studied using a three-dimensional coupled physical-biogeochemical model. A 5 years hindcast driven by realistic open-boundary conditions, atmospheric forcings, and freshwater discharges from rivers is performed. The use of recent in situ observations allowed an in-depth evaluation of the model nutrient and chlorophyll seasonal distributions, including the chlorophyll vertical structure. We find that different chlorophyll patterns of temporal variability coexist in the deep basin which thereby cannot be considered as a homogeneous region with respect to chlorophyll dynamics. A partitioning of the Gulf of Mexico open waters based on the winter chlorophyll concentration increase is then proposed. This partition is basically explained by the amount of nutrients injected into the euphotic layer which is highly constrained by the dynamic of the winter mixed layer. The seasonal and interannual variability appears to be affected by the variability of atmospheric fluxes and mesoscale dynamics (Loop Current eddies in particular). Finally, estimates of primary production in the deep basin are provided.