Iron supply to the western subarctic Pacific : Importance of iron export from the Sea of Okhotsk

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概要

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• Iron is an essential nutrient and plays an important role in the control of phytoplankton growth (Martin et al., 1989). Atmospheric dust has been thought to be the most important source of iron, supporting annual biological production in the western subarctic Pacific (WSP) (Duce and Tindale, 1991; Moore et al., 2002). We argue here for another source of iron to the WSP. We found extremely high concentrations of dissolved and particulate iron in the Okhotsk Sea Intermediate Water (OSIW) and the North Pacific Intermediate Water (NPIW), and water ventilation processes in this region probably control the transport of iron through the intermediate water layer from the continental shelf of the Sea of Okhotsk to wide areas of the WSP. Additionally, our time series data in the Oyashio region of the WSP indicate that the pattern of seasonal changes in dissolved iron concentrations in the surface-mixed layer was similar to that of macronutrients, and that deep vertical water mixing resulted in higher winter concentrations of iron in the surface water of this region. The estimated dissolved iron supply from the iron-rich intermediate waters to the surface waters in the Oyashio region was comparable to or higher than the reported atmospheric dust iron input and thus a major source of iron to these regions. Our data suggest that the consideration of this source of iron is essential in our understanding of spring biological production and biogeochemical cycles in the western subarctic Pacific and the role of the marginal sea.

• American Geophysical Unionの論文
• 2007-10-11

著者

• Johnson William

  Institute Of Ocean Science

• 齊藤 宏明

  東北水研

• 斉藤 宏明

  東北水研

• Tsuda A

  Univ. Tokyo Tokyo Jpn

• Takeda Shigenobu

  Univ. Tokyo Tokyo Jpn

• TSUMUNE DAISUKE

  Central Research Institute of Electric Power Industry

• YOSHIMURA TAKESHI

  Central Research Institute of Electric Power Industry

• NAKANISHI TAKAHIRO

  National Institute of Radiological Sciences

• ONO TSUNEO

  Hokkaido National Fisheries Research Institute

• SHIMIZU Takao

  Nagasaki Marine Observatory

• Nishioka Jun

  Institute Of Low Temperature Science Hokkaido University

• Takeda Shigenobu

  Central Research Institute of Electric Power Industry

• Saito H

  Tohoku National Fisheries Research Institute

• Tsuda Atsushi

  Atmosphere And Ocean Research Institute University Of Tokyo

• Ono Tsuneo

  Fisheries Res. Agency Hokkaido Jpn

• Suzuki Koji

  Faculty Of Environmental Earth Science Hokkaido University

• Nakatsuka Takeshi

  Hokkaido Univ. Hokkaido Jpn

• 齊藤 宏明

  水研セ東北水研

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