Seasonal variation in abundance and species composition of the Parmales community in the Oyashio region, western North Pacific

2015 ◽  
Vol 75 (3) ◽  
pp. 207-223 ◽  
Author(s):  
M Ichinomiya ◽  
A Kuwata
Keyword(s):  
Seasonal Variation ◽  
Species Composition ◽  
North Pacific ◽  
Western North Pacific ◽  
Oyashio Region

scholarly journals Seasonal variation of levoglucosan in aerosols over the western North Pacific and its assessment as a biomass-burning tracer

2010 ◽  
Vol 44 (29) ◽  
pp. 3511-3518 ◽  
Author(s):  
Michihiro Mochida ◽  
Kimitaka Kawamura ◽  
Pingqing Fu ◽  
Toshihiko Takemura
Keyword(s):  
Seasonal Variation ◽  
Biomass Burning ◽  
North Pacific ◽  
Western North Pacific

scholarly journals Dynamics of the Coastal Oyashio and Its Seasonal Variation in a High-Resolution Western North Pacific Ocean Model

2010 ◽  
Vol 40 (6) ◽  
pp. 1283-1301 ◽  
Author(s):  
Kei Sakamoto ◽  
Hiroyuki Tsujino ◽  
Shiro Nishikawa ◽  
Hideyuki Nakano ◽  
Tatsuo Motoi
Keyword(s):  
Seasonal Variation ◽  
Pacific Ocean ◽  
North Pacific ◽  
General Circulation ◽  
Western North Pacific ◽  
North Pacific Ocean ◽  
Maximum Velocity ◽  
Circulation Model ◽  
Okhotsk Sea ◽  
Resolution Model

Abstract The Coastal Oyashio (CO) carries the cold, fresh, and relatively light water mass called the Coastal Oyashio Water (COW) westward along the southeastern coast of Hokkaido in winter and spring. To investigate dynamics of the CO and its seasonal variation, model experiments are executed using a western North Pacific general circulation model with horizontal resolutions of approximately 2 and 6 km. The 2-km resolution model reproduces the properties of COW with temperature of 0°–2°C and salinity of 32.2–32.6 and reproduces its distribution. COW is less dense than offshore water by 0.2 kg m−3, and it forms a surface-to-bottom density front with a width of 10 km near the shelf break. The CO appears as a baroclinic jet current along the front with a maximum velocity of approximately 40 cm s−1. The velocity and density structures and the front location relative to bathymetry indicate that the CO can be understood in terms of a simplified dynamical model developed for the shelfbreak front in the Middle Atlantic Bight. In contrast to the 2-km resolution model, the 6-km model cannot realistically reproduce the COW distribution. This is because only the 2-km model can represent the sharp density structure of the shelfbreak front and the accompanying CO. The CO exists during the limited period from January to April. This is directly connected with seasonal variation of the COW inflow from the Okhotsk Sea to the North Pacific Ocean through the Nemuro and Kunashiri Straits, indicating that the seasonal variation of the CO is ultimately controlled by the variation of the circulation in the Okhotsk Sea induced by the monsoon.

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