scholarly journals Atmospheric response to the North Pacific hotspot in idealized simulations: Application to explosive and binary cyclogenesis

2021 ◽  
Author(s):  
Masaru Yamamoto
Keyword(s):  
North Pacific ◽  
Atmospheric Response ◽  
The North ◽  
The North Pacific

scholarly journals Nonlinearity in the North Pacific Atmospheric Response to a Linear ENSO Forcing

2019 ◽  
Vol 46 (4) ◽  
pp. 2271-2281 ◽  
Author(s):  
B. Jiménez‐Esteve ◽  
D. I. V. Domeisen
Keyword(s):  
North Pacific ◽  
Atmospheric Response ◽  
The North ◽  
The North Pacific

scholarly journals Mechanisms for the Maintenance of the Wintertime Basin-Scale Atmospheric Response to Decadal SST Variability in the North Pacific Subarctic Frontal Zone

2017 ◽  
Vol 31 (1) ◽  
pp. 297-315 ◽  
Author(s):  
Satoru Okajima ◽  
Hisashi Nakamura ◽  
Kazuaki Nishii ◽  
Takafumi Miyasaka ◽  
Akira Kuwano-Yoshida ◽  
...  
Keyword(s):  
North Pacific ◽  
Frontal Zone ◽  
Atmospheric Response ◽  
The North ◽  
Model Response ◽  
Basin Scale ◽  
Sst Anomaly ◽  
Subarctic Frontal Zone ◽  
The North Pacific ◽  
Sst Anomalies

Abstract Mechanisms for the maintenance of a large-scale wintertime atmospheric response to warm sea surface temperature (SST) anomalies associated with decadal-scale poleward displacement of the North Pacific subarctic frontal zone (SAFZ) are investigated through the following two ensemble experiments with an atmospheric general circulation model (AGCM): one with climatological-mean SST and the other with positive SST anomalies along the SAFZ prescribed on top of the climatological-mean SST. As actually observed, the simulated January ensemble response over the North Pacific is anticyclonic throughout the depth of the troposphere, although its amplitude is smaller. This response is maintained through energy conversion from the ensemble climatological-mean circulation realized under the climatological SST as well as feedback from anomalous transient eddy activity, suggesting that the response may have characteristics as a preferred mode of variability (or “dynamical mode”). Conversions of both available potential energy and kinetic energy from the climatological-mean state are important for the observed anomaly, while the latter is less pronounced for the model response. Net transient feedback forcing is also important for both the observed anomaly and simulated response. These results imply that a moderate-resolution (~1°) AGCM may be able to simulate a basin-scale atmospheric response to the SAFZ SST anomaly through synoptic- and basin-scale dynamical processes. Weaker PNA-like internal variability in the model may lead to the weaker response, suggesting that misrepresentation of intrinsic atmospheric variability can affect the model response to the SST anomaly.

scholarly journals The Atmospheric Response to Positive IPV, Positive AMV, and Their Combination in Boreal Winter

2019 ◽  
Vol 32 (14) ◽  
pp. 4193-4213 ◽  
Author(s):  
Dillon Elsbury ◽  
Yannick Peings ◽  
David Saint-Martin ◽  
Hervé Douville ◽  
Gudrun Magnusdottir
Keyword(s):  
Surface Temperature ◽  
Extreme Events ◽  
North Pacific ◽  
Climate Models ◽  
Wave Activity ◽  
Atmospheric Response ◽  
Aleutian Low ◽  
The North ◽  
The North Pacific ◽  
Wave Activity Flux

AbstractThe interdecadal Pacific oscillation (hereafter termed IPV, using “variability” in lieu of “oscillation”) and the Atlantic multidecadal oscillation (hereafter AMV, similar to IPV) are regulators of global mean temperature, large-scale atmospheric circulation, regional temperature and precipitation, and related extreme events. Despite a growing recognition of their importance, the combined influence of these modes of low-frequency sea surface temperature (SST) variability remains elusive given the short instrumental record and the difficulty of coupled climate models to simulate them satisfactorily. In this study, idealized simulations with two atmospheric global climate models (AGCMs) are used to show a partial cancellation of the North Pacific atmospheric response to positive IPV (i.e., deeper Aleutian low) by the concurrent positive phase of the AMV. This effect arises from a modulation of the interbasin Walker circulation that weakens deep convection in the western Pacific and the associated Rossby wave train into the northern extratropics. The weaker Aleutian low response is associated with less upward wave activity flux in the North Pacific; however, the associated stratospheric jet weakening is similar to when the +IPV alone forces the vortex, as additional upward wave activity flux over Siberia makes up the difference. While comparable warming of the polar stratosphere is found when the positive AMV is included with the positive IPV, the downward propagation of the stratospheric response is significantly reduced, which has implications for the associated surface temperature extremes. The robust anticorrelation between the positive IPV and positive AMV signals over the North Pacific and their lack of additivity highlight the need to consider the IPV–AMV interplay for anticipating decadal changes in mean climate and extreme events in the Northern Hemisphere.

scholarly journals Atmospheric response to the North Pacific enabled by daily sea surface temperature variability

2015 ◽  
Vol 42 (18) ◽  
pp. 7732-7739 ◽  
Author(s):  
Guidi Zhou ◽  
Mojib Latif ◽  
Richard J. Greatbatch ◽  
Wonsun Park
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
North Pacific ◽  
Temperature Variability ◽  
Sea Surface ◽  
Atmospheric Response ◽  
The North ◽  
The North Pacific

scholarly journals Warming of the North Pacific Ocean: Local Air–Sea Coupling and Remote Climatic Impacts

2007 ◽  
Vol 20 (11) ◽  
pp. 2581-2601 ◽  
Author(s):  
Lixin Wu ◽  
Chun Li
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Tropical Pacific ◽  
Meridional Overturning Circulation ◽  
Ocean Dynamics ◽  
Atmospheric Response ◽  
The North ◽  
The North Pacific ◽  
The Tropical Pacific

Abstract In this paper, global climatic response to the North Pacific oceanic warming is investigated in a series of coupled ocean–atmosphere modeling experiments. In the model, an idealized heating is imposed over the North Pacific Ocean, while the ocean and atmosphere remain fully coupled both locally and elsewhere. The model explicitly demonstrates that the North Pacific oceanic warming can force a significant change of the atmospheric circulation with a strong seasonal dependence. The seasonal marching of the atmospheric response over the North Pacific is characterized by a quasi-baratropic warm ridge in early winter, a transition to a quasi-baratropic warm trough in late winter, and then to a baroclinic response in summer with a trough and ridge, respectively, in the lower and upper troposphere. The North Pacific warming also forces a significant remote response over the tropical Pacific. In winter, the tropical Pacific response is characterized by a nearly uniform warming coupled with anomalous southerly cross-equatorial winds, while in summer it is dominated by an enhanced zonal SST gradient and anomalous equatorial easterlies. The tropical warming tends to be associated with a reduction of the upper-ocean meridional overturning circulation and equatorial ocean dynamics associated with a reduction of the Hadley circulation and the surface coupled wind–evaporation–SST feedback. The resulting tropical warming can further intensify the seasonal marching of the North Pacific atmospheric response. The global impacts of the North Pacific warming are also discussed.

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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