Geochemistry of Aptian/Albian black/green shale rhythms from the Rhenodanubian Flysch Zone of the East Alps: Geochemical indicators for atmospheric circulation changes?

2021 ◽  
pp. 127-130
Author(s):  
U. Wortmann ◽  
W. Zacher ◽  
R. Hesse
Keyword(s):  
Atmospheric Circulation ◽  
Geochemical Indicators ◽  
Circulation Changes

scholarly journals Aerosol reductions outweigh circulation changes for future improvements in Beijing haze

2021 ◽  
Author(s):  
Liang Guo ◽  
Laura J. Wilcox ◽  
Massimo Bollasina ◽  
Steven T. Turnock ◽  
Marianne T. Lund ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Atmospheric Circulation ◽  
Greenhouse Gas Emission ◽  
Weather Patterns ◽  
Atmospheric Circulation Patterns ◽  
Circulation Patterns ◽  
Main Driver ◽  
Emission Changes ◽  
Aerosol Emissions ◽  
Circulation Changes

Abstract. Despite local emission reductions, severe haze events remain a serious issue in Beijing. Previous studies have suggested that both greenhouse gas increases and aerosol decreases are likely to increase the frequency of weather patterns conducive to haze events. However, the combined effect of atmospheric circulation changes and aerosol and precursor emission changes on Beijing haze remains unclear. We use the Shared Socioeconomic Pathways (SSPs) to explore the effects of aerosol and greenhouse gas emission changes on both haze weather and Beijing haze itself. We confirm that the occurrence of haze weather patterns is likely to increase in future under all SSPs, and show that even though aerosol reductions play a small role, greenhouse gas increases are the main driver, especially during the second half of the 21st century. However, the severity of the haze events decreases on decadal timescales by as much as 70 % by 2100. The main influence on the haze itself is the reductions in local aerosol emissions, which outweigh the effects of changes in atmospheric circulation patterns. This demonstrates that aerosol reductions are beneficial, despite their influence on the circulation.

scholarly journals Atmospheric Dynamics Feedback: Concept, Simulations, and Climate Implications

2018 ◽  
Vol 31 (8) ◽  
pp. 3249-3264 ◽  
Author(s):  
Michael P. Byrne ◽  
Tapio Schneider
Keyword(s):  
Climate Change ◽  
Atmospheric Circulation ◽  
Radiative Forcing ◽  
Large Scale ◽  
Climate Models ◽  
Atmospheric Dynamics ◽  
Future Climate Change ◽  
Coupled Models ◽  
Near Surface ◽  
Circulation Changes

AbstractThe regional climate response to radiative forcing is largely controlled by changes in the atmospheric circulation. It has been suggested that global climate sensitivity also depends on the circulation response, an effect called the “atmospheric dynamics feedback.” Using a technique to isolate the influence of changes in atmospheric circulation on top-of-the-atmosphere radiation, the authors calculate the atmospheric dynamics feedback in coupled climate models. Large-scale circulation changes contribute substantially to all-sky and cloud feedbacks in the tropics but are relatively less important at higher latitudes. Globally averaged, the atmospheric dynamics feedback is positive and amplifies the near-surface temperature response to climate change by an average of 8% in simulations with coupled models. A constraint related to the atmospheric mass budget results in the dynamics feedback being small on large scales relative to feedbacks associated with thermodynamic processes. Idealized-forcing simulations suggest that circulation changes at high latitudes are potentially more effective at influencing global temperature than circulation changes at low latitudes, and the implications for past and future climate change are discussed.

Climate and atmospheric circulation changes over the past 1000 years reconstructed from oxygen isotopes in lake-sediment carbonate from Ireland

The Holocene ◽  
2010 ◽  
Vol 20 (7) ◽  
pp. 1105-1111 ◽  
Author(s):  
Jonathan Holmes ◽  
Carol Arrowsmith ◽  
William Austin ◽  
John Boyle ◽  
Elizabeth Fisher ◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
Lake Sediment ◽  
Oxygen Isotopes ◽  
The Past ◽  
Circulation Changes ◽  
Past 1000 Years

Behaviour of New Zealand Glaciers and Atmospheric Circulation Changes over the Past 130 years

The Holocene ◽  
1992 ◽  
Vol 2 (2) ◽  
pp. 97-106 ◽  
Author(s):  
B. B. Fitzharris ◽  
J. E. Hay ◽  
P. D. Jones
Keyword(s):  
New Zealand ◽  
Atmospheric Circulation ◽  
The Past ◽  
Circulation Changes

Atmospheric Circulation Changes in Response to an Observed Stratospheric Zonal Ozone Anomaly

2014 ◽  
Vol 53 (1) ◽  
pp. 74-88 ◽  
Author(s):  
Dieter H. W. Peters ◽  
Andrea Schneidereit ◽  
Marianne Bügelmayer ◽  
Christoph Zülicke ◽  
Ingo Kirchner
Keyword(s):  
Atmospheric Circulation ◽  
Circulation Changes

scholarly journals Anomalies of Central England Temperature Classified by Air Source

2009 ◽  
Vol 22 (5) ◽  
pp. 1069-1081 ◽  
Author(s):  
David E. Parker
Keyword(s):  
Atmospheric Circulation ◽  
Late Nineteenth Century ◽  
Sea Level Pressure ◽  
Mean Sea Level ◽  
Source Regions ◽  
Central England Temperature ◽  
Long Term Changes ◽  
Late Nineteenth ◽  
Circulation Changes

Abstract Daily anomalies of mean central England temperature (CET), relative to daily 1961–90 climatology, are analyzed in terms of the source of the air estimated from fields of mean sea level pressure. The average CET anomaly for a given source and calendar month during 1961–90 is taken as an estimate of the influence of atmospheric circulation for that source and calendar month, and the uncertainty in this influence is provided by the associated standard error. The atmospheric circulation influences are subtracted from the daily CET anomalies since the late nineteenth century to yield “residual anomalies,” which represent the influence of forcings other than atmospheric circulation. The use of air sources captures more circulation-related daily CET variance than the airflow indices used in previous studies. The warming in central England since the 1970s is not predominantly a result of atmospheric circulation changes, and the long-term changes of CET for air from major source regions are on the whole very similar to each other and to the overall long-term changes.

scholarly journals Influence of Arctic Wetlands on Arctic Atmospheric Circulation

2007 ◽  
Vol 20 (16) ◽  
pp. 4243-4254 ◽  
Author(s):  
William J. Gutowski ◽  
Helin Wei ◽  
Charles J. Vörösmarty ◽  
Balázs M. Fekete
Keyword(s):  
Boundary Conditions ◽  
Atmospheric Circulation ◽  
Land Surface ◽  
Lower Boundary ◽  
Internal Variability ◽  
Surface Fluxes ◽  
Arctic Climate ◽  
The Arctic ◽  
Energy And Momentum ◽  
Circulation Changes

Abstract The Arctic’s land surface has large areas of wetlands that exchange moisture, energy, and momentum with the atmosphere. The authors use a mesoscale, pan-Arctic model simulating the summer of 1986 to examine links between the wetlands and arctic atmospheric dynamics and water cycling. Simulations with and without wetlands are compared to simulations using perturbed initial and lateral boundary conditions to delineate when and where the wetlands influence rises above nonlinear internal variability. The perturbation runs expose the temporal variability of the circulation’s sensitivity to changes in lower boundary conditions. For the wetlands cases examined here, the period of the most significant influence is approximately two weeks, and the wetlands do not introduce new circulation changes but rather appear to reinforce and modify existing circulation responses to perturbations. The largest circulation sensitivity, and thus the largest wetlands influence, occurs in central Siberia. The circulation changes induced by adding the wetlands appear as a propagating, equivalent barotropic wave. The wetlands anomaly circulation spreads alterations of surface fluxes to other locations, which undermines the potential for the wetlands to present a distinctive, spatially fixed forcing to atmospheric circulation. Using the climatology of artic synoptic-storm occurrence to indicate when the arctic circulation is most sensitive to altered forcing, the results suggest that the circulation is susceptible to the direct influence of wetlands for a limited time period extending from spring thaw of wetlands until synoptic-storm occurrence diminishes in midsummer. Sensitivities in arctic circulation uncovered through this work occur during a period of substantial transition from a fundamentally frozen to thawed state, a period of major concern for impacts of greenhouse warming on pan-Arctic climate. Changing arctic climate could alter the behavior revealed here.

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