HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
Peer-reviewed Journal Articles, etc >

Development of a one-dimensional ecosystem model including the iron cycle applied to the Oyashio region, western subarctic Pacific

Files in This Item:
JGR117_C06021.pdf2.11 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/50990

Title: Development of a one-dimensional ecosystem model including the iron cycle applied to the Oyashio region, western subarctic Pacific
Authors: Shigemitsu, M. Browse this author
Okunishi, T. Browse this author
Nishioka, J. Browse this author
Sumata, H. Browse this author
Hashioka, T. Browse this author
Aita, M. N. Browse this author
Smith, S. L. Browse this author
Yoshie, N. Browse this author
Okada, N. Browse this author
Yamanaka, Y. Browse this author →KAKEN DB
Issue Date: 26-Jun-2012
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Oceans
Volume: 117
Start Page: C06021
Publisher DOI: 10.1029/2011JC007689
Abstract: To investigate the iron cycle at Station A4 in the Oyashio region of the western subarctic Pacific, we developed a 1-D ecosystem model consisting of 14 components including the iron cycle. The parameters associated with the iron cycle were optimized by assimilating monthly averaged data from time series observations for depth-integrated net primary production, nitrate, silicate, dissolved and particulate iron within the surface mixed layer (ML) and at two depths (200 and 300 m depth). The model successfully reproduced the observations and demonstrated that (1) on an annual basis, winter mixing of subsurface water supplies more dissolved iron (Fe_[d]) to the ML than does dust dissolution, (2) Fe_[d] concentration in the ML rapidly declines to near-depletion during the peak period of the diatom bloom in spring, which results in an increasing consumption ratio of silicate to nitrogenous nutrients by diatoms as they become more iron-limited, causing a more rapid decrease of silicate compared to that of nitrogenous nutrients in the ML, followed by the silicate limitation of diatoms, and (3) Fe_[d] supplied to the ML by dust dissolution and desorption from particulate iron, by alleviating iron limitation of phytoplankton, supports their continuous utilization of nitrate from spring to fall even though Fe_[d] concentration in the ML remains low after the peak spring bloom. The model explained quantitatively the above behavior of Fe_[d] and other nutrients associated with Fe_[d] over the annual cycle in the Oyashio region.
Rights: ©2012 American Geophysical Union
Type: article
URI: http://hdl.handle.net/2115/50990
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山中 康裕

Export metadata:

OAI-PMH ( junii2 , jpcoar )

MathJax is now OFF:


 

 - Hokkaido University