Nitrogen uptake and primary productivity rates in the Mid-Atlantic Bight (MAB)

Katherine C. Filippino; Margaret R. Mulholland; Peter W. Bernhardt

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Nitrogen uptake and primary productivity rates in the Mid-Atlantic Bight (MAB)

机译：大西洋中部海岸线（MAB）的氮吸收和初级生产力

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Nutrient concentrations, primary productivity, and nitrogen uptake rates were measured in coastal waters of the Mid-Atlantic Bight over a two-year period that included measurements from all four seasons. In order to assess carbon productivity and nitrogen demand within the context of the physical environment, the region was divided into three distinct hydrographic regimes: the Chesapeake and Delaware Bay outflow plumes (PL), the southern Mid-Atlantic shelf influenced by the Gulf Stream (SS), and the mid-shelf area to the north of the Chesapeake Bay mouth (MS). Annual areal rates of total nitrogen (N) uptake were similar across all regions (10.9 ±2.1 molNm(-2)y~(-1)). However, annual areal rates of net primary productivity were higher in the outflow plume region (43 mol C m(-2) y(-1)), than along the Mid-Atlantic shelf and in areas influenced by the Gulf Stream (41 and 34 mol C m~(-2) y(-1), respectively). Rates of net primary productivity were not well correlated with Chl a concentrations and were uncoupled with net N uptake rates. Seasonally averaged annual areal rates of net primary productivity for the Mid-Atlantic Bight measured in this study were higher than those calculated in previous decades and provide important validation information for biogeochemical models and satellite remote sensing algorithms developed for the region.

机译：在为期两年的大西洋中部沿海地区的沿海水域中，对营养物的浓度，初级生产力和氮素吸收率进行了测量，其中包括四个季节的测量值。为了评估自然环境中的碳生产率和氮需求，该地区被分为三个不同的水文状况：切萨皮克和特拉华湾流出羽（PL），受湾流影响的中大西洋南部陆架（ SS），以及切萨皮克湾河口（MS）以北的中层地区。所有区域的年度总氮吸收率相似（10.9±2.1 molNm（-2）y〜（-1））。但是，在流出羽流区域（43 mol C m（-2）y（-1））的年净初级生产力的年面积率比大西洋中部大陆架和受墨西哥湾流影响的地区要高（41和分别为34 mol C m〜（-2）y（-1）。净初级生产力的比率与Chla浓度没有很好的相关性，并且与净氮吸收率不相关。这项研究中测得的大西洋中部沿海地区净初级生产力的季节性平均年平均面积比率高于过去几十年的水平，为该地区开发的生物地球化学模型和卫星遥感算法提供了重要的验证信息。

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来源
《Estuarine Coastal and Shelf Science》 |2011年第1期|p.13-23|共11页
作者
Katherine C. Filippino; Margaret R. Mulholland; Peter W. Bernhardt;
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作者单位

Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, 4600 Elkhorn Ave, Norfolk, VA 23529, United States;

Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, 4600 Elkhorn Ave, Norfolk, VA 23529, United States;

Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, 4600 Elkhorn Ave, Norfolk, VA 23529, United States;

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正文语种 eng
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关键词
primary productivity; nitrogen uptake; mid-atlantic bight; nutrients;

机译：初级生产力;氮吸收;大西洋中段;营养素;

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Nitrogen uptake and primary productivity rates in the Mid-Atlantic Bight (MAB)

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