Large-Scale Disturbances in the Summertime Stratosphere

Muench, H. Stuart

doi:10.1175/1520-0469(1968)025<1108:lsdits>2.0.co;2

Cited by 14 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous observational studies have documented traveling and stationary waves in the stratosphere in the summer season. Muench [1968], Randel [1993], Miles et al [1994], and the studies cited by these authors showed westward propagating Rossby waves in the summer stratosphere in ozone, temperature, and velocity fields.…”

Section: Sources Of Variability In the Summer Stratospherementioning

confidence: 85%

Northern Hemisphere annular mode in summer: Its physical significance and its relation to solar activity variations

Lee

Hameed

2007

J. Geophys. Res.

View full text Add to dashboard Cite

We use the National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis to calculate empirical orthogonal functions of summer geopotential heights in the Northern Hemisphere at all levels in the troposphere and the stratosphere. The leading patterns in summer are distinct from the patterns in winter. Also, the leading patterns in the summer stratosphere are distinct from the patterns in the summer troposphere. The summer Northern Hemisphere annular mode (NAM) in the stratosphere has the same sign everywhere but shows higher variability at low latitudes unlike the dipolar structure of the winter NAM. A physical interpretation of the summer NAM in the stratosphere is readily apparent because low (high) values of its principal component correspond to warmer (colder) than climatological mean summer conditions in the stratosphere. The summer NAM in the troposphere, on the other hand, is characterized by variability over the Asian monsoon region. Also, the summer NAM in the stratosphere and upper troposphere is correlated with the solar ultraviolet flux, such that in solar maximum conditions the stratospheric circulation is more “summer‐like” than average and it is less summer‐like in solar minimum conditions. The summer NAM is thus seen as a potentially useful tool in investigating the sources of variability in the summer atmosphere.

show abstract

Section: Sources Of Variability In the Summer Stratospherementioning

confidence: 85%

Northern Hemisphere annular mode in summer: Its physical significance and its relation to solar activity variations

Lee

Hameed

2007

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Observations show these waves to be of two general types: large-scale, westward traveling disturbanc.•s and medkma-seale, eastward traveling disturbances. The former have been identified as Rossby waves (Muench 1968), though the origin and processes that affect their life cycles remain unclear. The medium-s•e, eastward traveling disturbances generally have baroclinie structures and are attributed to the instability of the zonal mean current (Yu et al 1984).…”

Section: Introductionmentioning

confidence: 99%

Ozone heating and the destabilization of traveling waves during summer

Nathan¹,

Cordero²,

Li³

1994

Geophysical Research Letters

View full text Add to dashboard Cite

The effects of ozone heating on the linear stability of lower stratospheric traveling waves of the summertime, extratropical circulation are examined. Based on coupled equations for the quasigeostrophic potential vorticity and ozone volume mixing ratio, it is shown that the diabatic heating arising from ozone advection can offset the damping due to Newtonian cooling, leading to wave amplification and significant changes in the structure and zonally rectified fluxes of the wave fields in both the lower stratosphere and troposphere. The vertical profile of the zonal mean wind plays a crucial role in determining whether the ozone heating destabilizes eastward and/or westward traveling disturbances.

show abstract

“…Traveling waves can propagate vertically into easterly winds if they have westward zonal phase speeds that are faster (more negative) than [. There is evidence of westward propagating waves in the summer stratosphere [Muench, 1968• andBowman [1996] showed that eddy diffusion coefficients (Kyy) in the summer lower stratosphere are Copyright 2000 by the American Geophysical Union.…”

mentioning

confidence: 99%