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Found 19 results

  1. Propagating Annular Modes: Empirical Orthogonal Functions, Principal Oscillation Patterns, and Time Scales Authors: Aditi Sheshadri and R. Alan Plumb Published online: 10th April, 2017 Abstract: The two leading empirical orthogonal functions (EOFs) of zonal-mean zonal wind describe north–south fluctuations, and intensification and narrowing, respectively, of the midlatitude jet. Under certain circumstances, these two leading EOFs cannot be regarded as independent but are in fact manifestations of a single, coupled, underlying mode of the dynamical sys
  2. Quantifying the variability of the annular modes: reanalysis uncertainty vs. sampling uncertainty Authors: Edwin P. Gerber and Patrick Martineau Published online: 4th December, 2018 Abstract: The annular modes characterize the dominant variability of the extratropical circulation in each hemisphere, quantifying vacillations in the position of the tropospheric jet streams and the strength of the stratospheric polar vortices. Their representation in all available reanalysis products is assessed. Reanalysis uncertainty associated with limitations in the
  3. Narrowing of the ITCZ in a warming climate: Physical mechanisms First published: 22 October 2016 Authors: Michael P. Byrne and Tapio Schneider First Published: October 22nd, 2016 Published on line: June 14th, 2016 Abstract: The Intertropical Convergence Zone (ITCZ) narrows in response to global warming in both observations and climate models. However, a physical understanding of this narrowing is lacking. Here we show that the narrowing of the ITCZ in simulations of future climate is related to changes in the moist
  4. Energetic Constraints on the Width of the Intertropical Convergence Zone Authors: Michael P. Byrne and Tapio Schneider First Published: February 9th, 2016 Published on line: June 14th, 2016 Abstract: The intertropical convergence zone (ITCZ) has been the focus of considerable research in recent years, with much of this work concerned with how the latitude of maximum tropical precipitation responds to natural climate variability and to radiative forcing. The width of the ITCZ, however, has received little attention despite its
  5. Atmospheric Dynamics Feedback: Concept, Simulations, and Climate Implications Authors: Michael P. Byrne and Tapio Schneider First Published: January 12th, 2018 Published on line: March 26th, 2018 Abstract: The 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 atm
  6. Fast and Slow Components of the Extratropical Atmospheric Circulation Response to CO2 Forcing Authors: Paulo Ceppi, Giuseppe Zappa, Theodore G. Shepherd and Jonathan M. Gregory First Published: September 15th, 2017 Published on line: January 19th, 2018 Abstract: Poleward shifts of the extratropical atmospheric circulation are a common response to CO2 forcing in global climate models (GCMs), but little is known about the time dependence of this response. Here it is shown that in coupled climate models, the long-term evolution
  7. Response of the Zonal Mean Atmospheric Circulation to El Niño versus Global Warming Authors: Jian Lu, Gang Chen and Dargan M. W. Frierson First Published: March 11th, 2008 Published on line: November 15th, 2008 Abstract: The change in the zonal mean atmospheric circulation under global warming is studied in comparison with the response to El Niño forcing, by examining the model simulations conducted for the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. In contrast to the strengthening and contraction
  8. Seasonal and Regional Variations of Long-Term Changes in Upper-Tropospheric Jets from Reanalyses Authors: Gloria L. Manney and Michaela I. Hegglin First Published: September 15th, 2017 Published on line: December 19th, 2017 Abstract: Long-term changes in upper-tropospheric jet latitude, altitude, and strength are assessed for 1980–2014 using five modern reanalyses: MERRA, MERRA-2, ERA-Interim, JRA-55, and NCEP CFSR. Changes are computed from jet locations evaluated daily at each longitude to analyze regional and seasonal variations.
  9. Projecting North American Climate over the Next 50 Years: Uncertainty due to Internal Variability Authors: Clara Deser and Adam S. Phillips Published: 30th October, 2013 Abstract: This study highlights the relative importance of internally generated versus externally forced climate trends over the next 50 yr (2010–60) at local and regional scales over North America in two global coupled model ensembles. Both ensembles contain large numbers of integrations (17 and 40): each of which is subject to identical anthropogenic radiative forcing (e.g., gre
  10. Regional Variations in Gravity Waves, Latent Heating, and the Tropical Circulation Authors: M. Joan Alexander Presentation Date: 24th July, 2017 Presentation Summary: Convective latent heating is an efficient generator of atmospheric gravity waves. Convectively generated gravity waves emanating from rain storms are observed far from their sources and at all levels in the atmosphere: At the surface, in the stratosphere, and even beyond in the mesosphere and thermosphere. They are common in the tropics, but are also observed at mid-latitudes and in all
  11. Snow–(N)AO Teleconnection and Its Modulation by the Quasi-Biennial Oscillation Authors: Y. Peings Published: 29th November, 2017 Abstract: This study explores the wintertime extratropical atmospheric response to Siberian snow anomalies in fall, using observations and two distinct atmospheric general circulation models. The role of the quasi-biennial oscillation (QBO) in modulating this response is discussed by differentiating easterly and westerly QBO years. The remote influence of Siberian snow anomalies is found to be weak in the models,
  12. A comprehensive climatology of atmospheric gravity wave parameters based on satellite limb soundings Authors: Manfred Ern, Quang Thai Trinh, Peter Preusse, John C. Gille, Martin G. Mlynczak, James M. Russell and Martin Riese Published: 27th April, 2018 Abstract: Gravity waves are one of the main drivers of atmospheric dynamics. The spatial resolution of most global atmospheric models, however, is too coarse to properly resolve the small scales of gravity waves, which range from tens to a few thousand kilometers horizontally, and from
  13. Contributions of Ice Thickness to the Atmospheric Response From Projected Arctic Sea Ice Loss Authors: Zachary Labe, Yannick Peings and Gudrun Magnusdottir Published: 18th May, 2018 Abstract: A large ensemble of simulations from a high‐top atmospheric general circulation model are conducted to compare the atmospheric responses from loss of Arctic sea ice thickness and sea ice concentration. The response to projected sea ice thickness loss indicates substantial surface warming over the Arctic Ocean and up to 1°C of cooling in Eurasia. While
  14. Toward a Physically Based Gravity Wave Source Parameterization in a General Circulation Model Authors: J. H. Richter, F. Sassi and R. R. Garcia Published: 6th July, 2009 Abstract: Middle atmospheric general circulation models (GCMs) must employ a parameterization for small-scale gravity waves (GWs). Such parameterizations typically make very simple assumptions about gravity wave sources, such as uniform distribution in space and time or an arbitrarily specified GW source function. The authors present a configuration of the Whole Atmosp
  15. Isentropic Pressure and Mountain Torques Authors: Joseph Egger and Klaus-Peter Hoinka Published: 12th March, 2009 Abstract: The relation of pressure torques and mountain torques is investigated on the basis of observations for the polar caps, two midlatitude and two subtropical belts, and a tropical belt by evaluating the lagged covariances of these torques for various isentropic surfaces. It is only in the polar domains and the northern midlatitude belts that the transfer of angular momentum to and from the earth at the mountains is associated with p
  16. Time-Lagged Response of the Antarctic and High-Latitude Atmosphere to Tropical MJO Convection Authors: Gina R. Henderson, Bradford S. Barrett, Ashley Lois, and Haadi Elsaawy Published: 22nd February, 2018 (online: 18th April, 2018) Abstract: Intraseasonal tropical variability has important implications for the mid- and high-latitude atmosphere, and in recent studies has been shown to modulate a number of weather processes in the Northern Hemisphere, such as snow depth, sea ice concentration, precipitation, atmospheric rivers, and air temperature. In
  17. Cold winter extremes in northern continents linked to Arctic sea ice loss Authors: Qiuhong Tang, Xuejun Zhang, Xiaohua Yang and Jennifer A Francis Published: 12th March, 2013 Abstract: The satellite record since 1979 shows downward trends in Arctic sea ice extent in all months, which are smallest in winter and largest in September. Previous studies have linked changes in winter atmospheric circulation, anomalously cold extremes and large snowfalls in mid-latitudes to rapid decline of Arctic sea ice in the preceding autumn. Using observational an
  18. Increased Variability in the Early Winter Subarctic North American Atmospheric Circulation Authors: James E. Overland (NOAA)and Muyin Wang (Joint Institute for the Study of the Atmosphere and Ocean, University of Washington) Published: 23rd July, 2015 (published online: 11th September, 2015) Abstract: The last decade shows increased variability in the Arctic Oscillation (AO) index for December. Over eastern North America such increased variability depended on amplification of the climatological longwave atmospheric circulation pattern. Re
  19. Investigating Possible Arctic–Midlatitude Teleconnections in a Linear Framework Authors: Raymond Sellevold, Stefan Sobolowski and Camille Li (Geophysical Institute, University of Bergen, Norway) First Published: 18th December, 2015 (published online: 27th September, 2016) Abstract: There is an ongoing debate over whether accelerated Arctic warming [Arctic amplification (AA)] is altering the large-scale circulation responsible for the anomalous weather experienced by midlatitude regions in recent years. Among the proposed mechanisms is the idea
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