Subduction of decadal North Pacific thermal anomalies in an ocean GCM

2001 ◽  
Vol 28 (12) ◽  
pp. 2449-2452 ◽  
Author(s):  
Rong-Hua Zhang ◽  
Takashi Kagimoto ◽  
Stephen E. Zebiak
Keyword(s):  
North Pacific ◽  
Thermal Anomalies

scholarly journals Removing the Effects of Tropical Dynamics from North Pacific Climate Variability

2021 ◽  
pp. 1-49
Author(s):  
Yingying Zhao ◽  
Matthew Newman ◽  
Antonietta Capotondi ◽  
Emanuele Di Lorenzo ◽  
Daoxun Sun
Keyword(s):  
Time Scales ◽  
North Pacific ◽  
Southern Oscillation ◽  
Spatial And Temporal Scales ◽  
Thermal Anomalies ◽  
Tropical Forcing ◽  
The North ◽  
Linear Inverse Model ◽  
The Tropics ◽  
The North Pacific

AbstractTeleconnections from the Tropics energize variations of the North Pacific climate, but detailed diagnosis of this relationship has proven difficult. Simple univariate methods, such as regression on El Niño-Southern Oscillation (ENSO) indices, may be inadequate since the key dynamical processes involved -- including ENSO diversity in the Tropics, re-emergence of mixed layer thermal anomalies, and oceanic Rossby wave propagation in the North Pacific -- have a variety of overlapping spatial and temporal scales. Here we use a multivariate Linear Inverse Model to quantify tropical and extra-tropical multi-scale dynamical contributions to North Pacific variability, in both observations and CMIP6 models. In observations, we find that the Tropics are responsible for almost half of the seasonal variance, and almost three quarters of the decadal variance, along the North American coast and within the subtropical front region northwest of Hawaii. SST anomalies that are generated by local dynamics within the Northeast Pacific have much shorter time scales, consistent with transient weather forcing by Aleutian low anomalies. Variability within the Kuroshio-Oyashio Extension (KOE) region is considerably less impacted by the Tropics, on all time scales. Consequently, without tropical forcing the dominant pattern of North Pacific variability would be a KOE pattern, rather than the Pacific Decadal Oscillation (PDO). In contrast to observations, most CMIP6 historical simulations produce North Pacific variability that maximizes in the KOE region, with amplitude significantly higher than observed. Correspondingly, the simulated North Pacific in all CMIP6 models is shown to be relatively insensitive to the Tropics, with a dominant spatial pattern generally resembling the KOE pattern, not the PDO.

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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