scholarly journals Assimilation of TOPEX Altimeter Data into a One and One-half Layer Model of the North Pacific.

1999 ◽  
Vol 8 (4) ◽  
pp. 253-267
Author(s):  
Masahisa Kubota ◽  
Hidekazu Yokota
Keyword(s):  
North Pacific ◽  
Altimeter Data ◽  
Layer Model ◽  
The North ◽  
The North Pacific

Forcing of Low-Frequency Ocean Variability in the Northeast Pacific*

2009 ◽  
Vol 22 (5) ◽  
pp. 1255-1276 ◽  
Author(s):  
Kettyah C. Chhak ◽  
Emanuele Di Lorenzo ◽  
Niklas Schneider ◽  
Patrick F. Cummins
Keyword(s):  
North Pacific ◽  
Ocean Dynamics ◽  
Sea Surface ◽  
Altimeter Data ◽  
Atmospheric Forcing ◽  
Ocean Variability ◽  
Northeast Pacific ◽  
The North ◽  
The Mean ◽  
The North Pacific

Abstract An ocean model is used to examine and compare the forcing mechanisms and underlying ocean dynamics of two dominant modes of ocean variability in the northeast Pacific (NEP). The first mode is identified with the Pacific decadal oscillation (PDO) and accounts for the most variance in model sea surface temperatures (SSTs) and sea surface heights (SSHs). It is characterized by a monopole structure with a strong coherent signature along the coast. The second mode of variability is termed the North Pacific Gyre Oscillation (NPGO). This mode accounts for the most variance in sea surface salinities (SSSs) in the model and in long-term observations. While the NPGO is related to the second EOF of the North Pacific SST anomalies (the Victoria mode), it is defined here in terms of SSH anomalies. The NPGO is characterized by a pronounced dipole structure corresponding to variations in the strengths of the eastern and central branches of the subpolar and subtropical gyres in the North Pacific. It is found that the PDO and NPGO modes are each tied to a specific atmospheric forcing pattern. The PDO is related to the overlying Aleutian low, while the NPGO is forced by the North Pacific Oscillation. The above-mentioned climate modes captured in the model hindcast are reflected in satellite altimeter data. A budget reconstruction is used to study how the atmospheric forcing drives the SST and SSH anomalies. Results show that the basinwide SST and SSS anomaly patterns associated with each mode are shaped primarily by anomalous horizontal advection of mean surface temperature and salinity gradients (∇ Tand ∇ S) via anomalous surface Ekman currents. This suggests a direct link of these modes with atmospheric forcing and the mean ocean circulation. Smaller-scale patterns in various locations along the coast and in the Gulf of Alaska are, however, not resolved with the budget reconstructions. Vertical profiles of the PDO and NPGO indicate that the modes are strongest mainly in the upper ocean down to 250 m. The shallowness of the modes, the depth of the mean mixed layer, and wintertime temperature profile inversions contribute to the sensitivity of the budget analysis in the regions of reduced reconstruction skill.

Dynamics of a Quasi-Stationary Jet along the Subarctic Front in the North Pacific Ocean (the Western Isoguchi Jet): An Ideal Two-Layer Model

2018 ◽  
Vol 48 (4) ◽  
pp. 807-830 ◽  
Author(s):  
Toru Miyama ◽  
Humio Mitsudera ◽  
Hajime Nishigaki ◽  
Ryo Furue
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Layer Model ◽  
Seafloor Topography ◽  
The North ◽  
Subarctic Front ◽  
Barotropic Flow ◽  
Two Layer Model ◽  
The North Pacific

ABSTRACTThe dynamics of a quasi-stationary jet along the Subarctic Front in the North Pacific Ocean (the Western Isoguchi Jet) were investigated using an idealized two-layer model. The experiments suggested that a seafloor topography, which is 500 m high, produces a jet along its eastern flank. The formation mechanism of the jet can be explained via baroclinic Rossby wave characteristics. Baroclinic Rossby waves propagate along characteristic curves, which are significantly distorted by anticyclonic barotropic flow on the seafloor topography. A baroclinic surface jet is formed where a characteristic curve originating in the subtropical gyre and one originating in the subpolar gyre meet because the pycnocline depth varies discontinuously at this location. The barotropic flow on the seafloor topography is induced by eddies.

Intra-seasonal and inter-annual patterns in the demographics of sand lance and response to environmental drivers in the North Pacific

2019 ◽  
Vol 617-618 ◽  
pp. 221-244 ◽  
Author(s):  
MR Baker ◽  
ME Matta ◽  
M Beaulieu ◽  
N Paris ◽  
S Huber ◽  
...  
Keyword(s):  
North Pacific ◽  
Environmental Drivers ◽  
Sand Lance ◽  
The North ◽  
The North Pacific ◽  
Annual Patterns
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