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Found 6 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. The Effect of Tropospheric Jet Latitude on Coupling between the Stratospheric Polar Vortex and the Troposphere Authors: Chaim I. Garfinkel, Darryn W. Waugh and Edwin P. Gerber Published online: 22nd March, 2013 Abstract: A dry general circulation model is used to investigate how coupling between the stratospheric polar vortex and the extratropical tropospheric circulation depends on the latitude of the tropospheric jet. The tropospheric response to an identical stratospheric vortex configuration is shown to be strongest for a jet centered near 40° an
  3. 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
  4. The Effect of QBO Phase on the Atmospheric Response to Projected Arctic Sea Ice Loss in Early Winter Authors: Zachary Labe, Yannick Peings and Gudrun Magnusdottir Published online: 24th June, 2019 Abstract: Recent modeling studies have shown an important role for stratosphere‐troposphere coupling in the large‐scale atmospheric response to Arctic sea ice loss. Evidence is growing that the Quasi‐biennial Oscillation (QBO) can contribute to or even mitigate teleconnections from surface forcing. Here, the influence of QBO phase on the atmospheric resp
  5. Snow–Atmosphere Coupling Strength. Part I: Effect of Model Biases Authors: Li Xu, Paul Dirmeyer Published: April 2013 Abstract: Snow–atmosphere coupling strength, the degree to which the atmosphere (temperature and precipitation) responds to underlying snow anomalies, is investigated using the Community Climate System Model (CCSM) with realistic snow information obtained from satellite and data assimilation. The coupling strength is quantified using seasonal simulations initialized in late boreal winter with realistic initial snow states or forced with
  6. Snow–atmosphere coupling in the Northern Hemisphere Authors: Gina R. Henderson, Yannick Peings, Jason C. Furtado & Paul J. Kushner Published: Oct 2018 Abstract: Local and remote impacts of seasonal snow cover on atmospheric circulation have been explored extensively, with observational and modelling efforts focusing on how Eurasian autumn snow-cover variability potentially drives Northern Hemisphere atmospheric circulation via the generation of deep, planetary-scale atmospheric waves. Despite climate modelling advances, models remain challenged to
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