Decadal reanalysis of biogeochemical indicators and fluxes in the North West European shelf-sea ecosystem
Decadal reanalysis of biogeochemical indicators and fluxes in the North West European shelf-sea ecosystem
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DOI：
10.1002/2015jc011496
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发表时间：
2016-03-01
影响因子：
3.6
通讯作者：
Allen, J. I.
中科院分区：
文献类型：
--
作者：
Ciavatta, S.;Kay, S.;Allen, J. I.
本文介绍了西北欧大陆架地球化学的第一个十年再分析模拟，沿着对其技巧、可信度和价值的全面评价。采用局部集合卡尔曼滤波器，将具有误差特征的叶绿素卫星产品同化到东北大西洋的物理生物地球化学模型中。结果表明，再分析在60%的研究区域改善了同化叶绿素的模式模拟。模型验证指标表明，再分析的技能，在10个生态系统变量的大型数据集的现场观测相匹配。斯皮尔曼等级相关性是显着的，高于0.7的物理化学变量（温度，盐度和氧气），类似于0.6的叶绿素和营养物质（磷酸盐，硝酸盐和硅酸盐），和显着的，虽然值较低，溶解的二氧化碳分压（类似于0.4）。再分析捕捉到了pH值和氨的观测值，但没有捕捉到它们的变异性。两个案例研究举例说明了再分析对评估环境状况和变异性的价值。第一项研究表明，325 000至365 000平方公里的大陆架底层沃茨易受缺氧影响，可能威胁到底层鱼类和底栖生物。第二次应用证实，大陆架是大气二氧化碳的净汇，但在90%的置信水平下，吸收总量在36和46 Tg C yr（-1）之间变化。这些结果表明，再分析输出数据集可以告知西北欧大陆架生态系统的管理，富营养化，渔业和碳循环的变化。
This paper presents the first decadal reanalysis simulation of the biogeochemistry of the North West European shelf, along with a full evaluation of its skill, confidence, and value. An error-characterized satellite product for chlorophyll was assimilated into a physical-biogeochemical model of the North East Atlantic, applying a localized Ensemble Kalman filter. The results showed that the reanalysis improved the model simulation of assimilated chlorophyll in 60% of the study region. Model validation metrics showed that the reanalysis had skill in matching a large data set of in situ observations for 10 ecosystem variables. Spearman rank correlations were significant and higher than 0.7 for physical-chemical variables (temperature, salinity, and oxygen), similar to 0.6 for chlorophyll and nutrients (phosphate, nitrate, and silicate), and significant, though lower in value, for partial pressure of dissolved carbon dioxide (similar to 0.4). The reanalysis captured the magnitude of pH and ammonia observations, but not their variability. The value of the reanalysis for assessing environmental status and variability has been exemplified in two case studies. The first shows that between 325,000 and 365,000 km(2) of shelf bottom waters were vulnerable to oxygen deficiency potentially threatening bottom fishes and benthos. The second application confirmed that the shelf is a net sink of atmospheric carbon dioxide, but the total amount of uptake varies between 36 and 46 Tg C yr(-1) at a 90% confidence level. These results indicate that the reanalysis output data set can inform the management of the North West European shelf ecosystem, in relation to eutrophication, fishery, and variability of the carbon cycle.