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Session 13. POC/BIO/MONITOR/FUTURE Topic Session
Comparing the two major gyres of the subarctic North Pacific - Seasonal and interannual variability and its predictability

Co-Convenors: James Christian (Canada), Emanuele Di Lorenzo (U.S.A.), Shin-ichi Ito (Japan), David Mackas (Canada), Vyacheslav Lobanov (Russia) and Atsushi Tsuda (Japan)

n the North Pacific, there are two major gyres; the western subarctic gyre and the Alaskan gyre. Although severe winter conditions have limited observational activity, recent progress in observational networks, including satellites, drifters and Argo floats, have improved our understandings of the two gyres. Both gyres are mainly driven by the subarctic wind field and are expected to be synchronized with each other. However, the real responses are not so simple. For example, the western subarctic gyre shows large seasonal variability in the western boundary current (Oyashio), while the Alaskan stream does not show large seasonal variability. In addition to these physical characteristics, chemical and biological characteristics are different. For example, iron supply is larger in the western subarctic gyre since the distance from the terrestrial sources is closer than in the Alaskan gyre. This, in turn, affects seasonal cycling and magnitudes of phytoplankton and zooplankton production. Therefore ecosystems are also different in the two gyres. To achieve better understanding of the mechanisms of the subarctic response to atmospheric forcing, comparisons of the responses of the two gyres are essential. This session will focus on the comparison of the physical, chemical and biological characteristics of the two gyres, on all time scales. Presentations on predictability of the two gyres, or which address additional improvements of the subarctic observation network are also welcome.

Friday, October 29, 2010

Osamu Isoguchi and Hiroshi Kawamura (Invited)
Seasonal to interannual variations of the western boundary current of the subarctic North Pacific using altimeter data (S13-6477)
(pdf, 2.3 Mb)


Howard Freeland
Heat and Salt conservation in the N.E. Pacific (S13-6796)
(pdf, 1 Mb)


Sachihiko Itoh, Ichiro Yasuda and Hiromichi Ueno
Warm and cold-core anticyclonic eddies in the western subarctic North Pacific (S13-6545)
(pdf, 3 Mb)


Joaquim I. Goes, Helga do R. Gomes, Kosei Sasaoka and Toshiro Saino (Invited)
The role of the Aleutian Low Pressure System in regulating phytoplankton biomass, primary production and export production across the subarctic Pacific Ocean basin (S13-6610)
(pdf, 3 Mb)

Rui Saito, Atsushi Yamaguchi, Ichiro Imai, Sei-Ichi Saitoh and Kenshi Kuma
East-west comparison of the zooplankton community in the Subarctic Pacific during the summers of 2003-2006 (S13-6433)
(pdf, 1.5 Mb)
Sanae Chiba (Invited)
An overview of ecosystem state variability in the subarctic North Pacific: East-west synchrony and contrast (S13-6587)
(waiting for permission)
Hiroaki Saito, Atsushi Tsuda, Hiroaki Tatebe
West meets East: Inter-gyre transportation of Neocalanus copepods (S13-6669)
(pdf, 1 Mb)
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