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Interannual variability in the magnitude and timing of the spring bloom in the Oyashio region

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Title: Interannual variability in the magnitude and timing of the spring bloom in the Oyashio region
Authors: Okamoto, Suguru Browse this author
Hirawake, Toru Browse this author →KAKEN DB
Saitoh, Sei-Ichi Browse this author →KAKEN DB
Keywords: Satellite data
Spring bloom
Chl-α concentration
Spatio-temporal variability
Geostrophic current
Oyashio
Issue Date: Sep-2010
Publisher: Elsevier
Journal Title: Deep Sea Research Part II: Topical Studies in Oceanography
Volume: 57
Issue: 17-18
Start Page: 1608
End Page: 1617
Publisher DOI: 10.1016/j.dsr2.2010.03.005
Abstract: Inter-annual variability in the magnitude and timing of the spring bloom was investigated for the Oyashio region (40°-48°N, 143°E-152°E) using 10 years (from 1998 to 2007) of satellite ocean color data. Geostrophic currents were examined using satellite altimeter data. Early spring blooms ( > 1.5 mg m^[-3]) occurred in early April 2001 and late March 2002. The 2001 bloom continued for one month. Late blooms occurred from mid-May 1999, early June 2004 and late April 2006, continuing for about 1 month, 8 days and 16 days, respectively. A strong bloom (4.7 mg m^[-3]) also occurred in mid-April 1998; however, it terminated in early May. We classified the Oyashio region based on the pattern of temporal variation of Chl-α concentration from March to June. The spatio-temporal variability in Chl-α concentration during spring was different among years. The area where Chl-α concentration was highest in April was more extensive in 2001, 2002 and 2006 than usual. In 1999, the area where Chl-α concentration was highest in May was the widest among the 10 years. Mesoscale eddies and currents with high velocity were frequently observed in the area of high Chl-α concentration east of Hokkaido, advecting Coastal Oyashio Water of low salinity and low density into the oceanic region. That strengthened stratification in the surface layer. We suggest that this seaward transfer of coastal water could be one of the important factors for phytoplankton distribution in two ways: (1) horizontal advection of water with high Chl-α concentration and (2) enhancement of stratification in the oceanic region.
Type: article (author version)
URI: http://hdl.handle.net/2115/43804
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 齊藤 誠一

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