极地研究

极地研究 ›› 2008, Vol. 19 ›› Issue (2-English): 185-192.

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The significance of water column nitrification in the southeastern Bering Sea

 Clara J Deal1, Jin Meibing1 and Wang Jia2   

  1. 1 International Arctic Research Center, University of Alaska Fairbanks, USA;
    2 Great Lakes Environmental Research Lab, NOAA, USA
  • 出版日期:1958-06-30 发布日期:1958-06-30
  • 通讯作者: Wang Jia

The significance of water column nitrification in the southeastern Bering Sea

 Clara J Deal1, Jin Meibing1 and Wang Jia2   

  1. 1 International Arctic Research Center, University of Alaska Fairbanks, USA;
    2 Great Lakes Environmental Research Lab, NOAA, USA
  • Online:1958-06-30 Published:1958-06-30
  • Contact: Wang Jia

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摘要：

Nitrate is considered the nutrient that limits new primary production in the southeastern Bering Sea shelf. Nitrate regenerated through biological nitrification has the potential to significantly support primary production as well. Here we use measurements of the specific rate of water column nitrification in a 1-D ecosystem model to quantify the resupply of nitrate from nitrification in the middle shelf of the southeastern Bering Sea. Model sensitivity studies reveal nitrification rate is an important control on the dominant phytoplankton functional type, and the amount of nitrate in summer bottom waters and in the winter water column. Evaluation of nitrification using the model supports the hypothesis that increases in late-summer nitrate concentrations observed in the southeastern Bering Sea bottom waters are due to nitrification. Model results for nitrate replenishment exceed previously estimated rates of 20-30% based on observations. The results of this study indicate that nitrification, potentially the source of up to -38%of the springtime water column nitrate, could support -24% of the annual primary production.

关键词: Arctic, Southeast Bering Sea, water column nitrification

Abstract:

Nitrate is considered the nutrient that limits new primary production in the southeastern Bering Sea shelf. Nitrate regenerated through biological nitrification has the potential to significantly support primary production as well. Here we use measurements of the specific rate of water column nitrification in a 1-D ecosystem model to quantify the resupply of nitrate from nitrification in the middle shelf of the southeastern Bering Sea. Model sensitivity studies reveal nitrification rate is an important control on the dominant phytoplankton functional type, and the amount of nitrate in summer bottom waters and in the winter water column. Evaluation of nitrification using the model supports the hypothesis that increases in late-summer nitrate concentrations observed in the southeastern Bering Sea bottom waters are due to nitrification. Model results for nitrate replenishment exceed previously estimated rates of 20-30% based on observations. The results of this study indicate that nitrification, potentially the source of up to -38%of the springtime water column nitrate, could support -24% of the annual primary production.

Key words: Arctic, Southeast Bering Sea, water column nitrification