Dependence of the annular mode in the troposphere and stratosphere on orography and land-sea heating contrasts

Details Dependence of the annular mode in the troposphere and stratosphere on orography and land-sea heating contrasts Dependence of the annular mode in the troposphere and stratosphere on orography and land-sea heating contrasts

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30e..69k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 5, pp. 69-1, CiteID 1265, DOI 10.1029/2002GL016327

Physics

1

Global Change: Climate Dynamics (3309), Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Stratosphere/Troposphere Interactions

Scientific paper

Using an idealized general circulation model, we explore the influence of orography and land-sea heating contrasts on the development of Annular Modes (AM) under perpetual January conditions. In the troposphere, model experiments with different stationary wave forcing all show an internally induced AM, but with significantly different amplitudes. Only the combined forcing of orography and land-sea heating contrast leads to a localization of the AM similar to the North Atlantic Oscillation, and additionally, to a stratospheric AM and its downward propagation. A tropospheric feedback mechanism between the anomalies of zonal-mean wind and stationary waves applies in the simulation with the combined forcing only, where the coupling of orographically and thermally forced waves reproduces the observed stationary waves, and where the simulated diabatic heating supports the feedback mechanism. In contrast, transient forcing dominates the variability in the experiments without orography, comparable to the Southern AM.

Affiliated with

Also associated with

No associations

Rating

Dependence of the annular mode in the troposphere and stratosphere on orography and land-sea heating contrasts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dependence of the annular mode in the troposphere and stratosphere on orography and land-sea heating contrasts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dependence of the annular mode in the troposphere and stratosphere on orography and land-sea heating contrasts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-997847