Inter-Basin Link between the North Pacific and North Atlantic in the Upper Tropospheric Circulation: Its Dominance and Seasonal Dependence

Honda, Meiji; Yamane, Shunsuke; Nakamura, Hisashi

doi:10.2151/jmsj.85.899

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…The East Asian positive anomalies explain the decrease of the simulated rainfall in southeastern China. Additionally, the concurrence of the North Pacific responses with the North Atlantic responses suggests that the seesaw mechanism for the interbasin link proposed by Honda et al [2007] may be operational.…”

Section: Model Responsesmentioning

confidence: 90%

Seasonal response of Asian monsoonal climate to the Atlantic Multidecadal Oscillation

2009

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[1] The influence of the Atlantic Multidecadal Oscillation (AMO) on Asian monsoonal climate in all four seasons is investigated by comprehensive observational analyses and ensemble experiments with atmospheric general circulation models (AGCMs). Three AGCMs are forced by prescribed climatological seasonal cycle of sea surface temperature (SST) or with additional SST anomalies representing the warmth phase of the AMO. The results in both the observations and the models consistently suggest that the warm AMO phase gives rise to elevated air temperatures in East Asia and northern India but decreased air temperatures in much of central-southern India in all four seasons. This positive AMO anomaly also causes more rainfall in central and southern India in every season, particularly in summer and fall. In contrast, the sign of AMO influences on East Asian rainfall is season-dependent: in southeastern China, it induces increased rainfall in summer but suppressed rainfall in autumn. It is suggested that these AMO influences are realized by warming Eurasian middle and upper troposphere in all four seasons, resulting in weakened Asian winter monsoons but enhanced summer monsoons. Furthermore, the formation of the troposphere heating anomaly may be related to the wave guidance mechanism associated with the Asian upper jet.

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Section: Model Responsesmentioning

confidence: 90%

Seasonal response of Asian monsoonal climate to the Atlantic Multidecadal Oscillation

2009

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“…The interbasin link between the North Atlantic and the North Pacific depends on season, however, as the AO most resembles the NAO in early winter, with a limited signal over the North Pacific, but is also influenced by the Aleutian-Icelandic low seesaw in late winter, which involves the PNA pattern and has a large amplitude over the North Pacific (Honda and Nakamura 2001;Honda et al 2005Honda et al , 2007. As the Icelandic low is at higher latitude than the Aleutian low, the seesaw changes the zonal wind and the surface turbulent heat flux over the North Atlantic and the North Pacific with a very similar latitudinal profile.…”

Section: E Connection Between Gs and Koe Variabilitymentioning

confidence: 99%

Role of the Gulf Stream and Kuroshio–Oyashio Systems in Large-Scale Atmosphere–Ocean Interaction: A Review

Alexander²,

et al. 2010

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Ocean-atmosphere interaction over the Northern Hemisphere western boundary current (WBC) regions (i.e., the Gulf Stream, Kuroshio, Oyashio, and their extensions) is reviewed with an emphasis on their role in basin-scale climate variability. SST anomalies exhibit considerable variance on interannual to decadal time scales in these regions. Low-frequency SST variability is primarily driven by basin-scale wind stress curl variability via the oceanic Rossby wave adjustment of the gyre-scale circulation that modulates the latitude and strength of the WBC-related oceanic fronts. Rectification of the variability by mesoscale eddies, reemergence of the anomalies from the preceding winter, and tropical remote forcing also play important roles in driving and maintaining the low-frequency variability in these regions. In the Gulf Stream region, interaction with the deep western boundary current also likely influences the low-frequency variability. Surface heat fluxes damp the low-frequency SST anomalies over the WBC regions; thus, heat fluxes originate with heat anomalies in the ocean and have the potential to drive the overlying atmospheric circulation. While recent observational studies demonstrate a local atmospheric boundary layer response to WBC changes, the latter's influence on the large-scale atmospheric circulation is still unclear. Nevertheless, heat and moisture fluxes from the WBCs into the atmosphere influence the mean state of the atmospheric circulation, including anchoring the latitude of the storm tracks to the WBCs. Furthermore, many climate models suggest that the large-scale atmospheric response to SST anomalies driven by ocean dynamics in WBC regions can be important in generating decadal climate variability. As a step toward bridging climate model results and observations, the degree of realism of the WBC in current climate model simulations is assessed. Finally, outstanding issues concerning oceanatmosphere interaction in WBC regions and its impact on climate variability are discussed.

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“…Weather and climatic conditions are determined here mainly by the interaction of three main baric formations that are seasonal AACs: the Aleutian minimum (Aleutian depression), the North Pacific (Hawaiian) High and the Siberian winter anticyclone, which determine the wind field structure and the state of the upper layer of the ocean. Climatic changes occurring in the northern Pacific Ocean and the Pacific subarctic, through circulation mechanisms in the atmosphere and regional AACs, are closely related to similar phenomena in other regions [2,[26][27][28] and influence the ongoing global processes, being an important regulator of interdecadal climatic fluctuations [29][30][31]. [32], fields of pressure, wind and heat fluxes on the ocean surface, as well as climatic indices (CI) taking into account the seasonality of their action: PDO, AMO, SOI, PTW, NP, WP, PNA and EP/NP, was used in the present study [22].…”

Section: Introductionmentioning

confidence: 99%

Climatic Changes of Thermal Conditions in the Pacific Subarctic at the Modern Stage of Global Warming

Rostov¹,

Dmitrieva²,

Rudykh³

2021

PhO

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Purpose. The study is aimed at identifying the regional features of the surface air temperature in the coastal zone and over the Pacific Ocean (to the north of 40° N) manifested as a result of global climate changes at the turn of the XX–XXI centuries, and at assessing their trends and possible causal relationships with the processes in the atmosphere and on the ocean surface. Methods and Results. Based on the Global Meteorological Network and NOAA reanalysis data, the regional features of interannual oscillations of the surface air temperature and their relationship with variations in the fields of pressure, wind and water temperature on the ocean surface, and with climate indices over the past 4 decades were identified. In order to determine the temperature field spatial-temporal structure and to zone the water area according to the features of climate changes, the methods of cluster, correlation analysis and the apparatus of empirical orthogonal functions were used. The results obtained made it possible to characterize the degree of heterogeneity of the studied area response to the ongoing global changes, to identify different domains and to assess quantitatively the warming rate in these water areas. Conclusions. The tendencies of modern warming are manifested in the trends of interannual air temperature variability, on the average, by ~0.20°C/10 years in the subarctic, and indicate significant regional differences (1.5–2 times) in the ongoing changes. In the west of the region, the warming rate is higher than in the east, where the temperature trends are minimal or statistically insignificant. In the warm period of a year, their values are higher than those in the cold period. The alternation phases of the warm and cold periods are consistent with the variation tendencies in the characteristics both of the atmospheric action centers and various climatic parameters. The corresponding correlations are most widely manifested in variations in the empirical orthogonal functions modes of the H500 geopotential field, and the PDO, NP, SOI, PTW, AD and EP/NP indices. Stable anomalies and trends of the ocean surface temperature in the North Atlantic also play an important role in formation of the Та anomalies in the western subarctic.

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Inter-Basin Link between the North Pacific and North Atlantic in the Upper Tropospheric Circulation: Its Dominance and Seasonal Dependence

Cited by 9 publications

References 29 publications

Seasonal response of Asian monsoonal climate to the Atlantic Multidecadal Oscillation

Seasonal response of Asian monsoonal climate to the Atlantic Multidecadal Oscillation

Role of the Gulf Stream and Kuroshio–Oyashio Systems in Large-Scale Atmosphere–Ocean Interaction: A Review

Climatic Changes of Thermal Conditions in the Pacific Subarctic at the Modern Stage of Global Warming

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