Ozone Loss and Recovery and the Preconditioning of Upward-Propagating Planetary Wave Activity Journal Article uri icon

Overview

abstract

  • Abstract; A mechanistic chemistry–dynamical model is used to evaluate the relative importance of radiative, photochemical, and dynamical feedbacks in communicating changes in lower-stratospheric ozone to the circulation of the stratosphere and lower mesosphere. Consistent with observations and past modeling studies of Northern Hemisphere late winter and early spring, high-latitude radiative cooling due to lower-stratospheric ozone depletion causes an increase in the modeled meridional temperature gradient, an increase in the strength of the polar vortex, and a decrease in vertical wave propagation in the lower stratosphere. Moreover, it is shown that, as planetary waves pass through the ozone loss region, dynamical feedbacks precondition the wave, causing a large increase in wave amplitude. The wave amplification causes an increase in planetary wave drag, an increase in residual circulation downwelling, and a weaker polar vortex in the upper stratosphere and lower mesosphere. The dynamical feedbacks responsible for the wave amplification are diagnosed using an ozone-modified refractive index; the results explain recent chemistry–coupled climate model simulations that suggest a link between ozone depletion and increased polar downwelling. The effects of future ozone recovery are also examined and the results provide guidance for researchers attempting to diagnose and predict how stratospheric climate will respond specifically to ozone loss and recovery versus other climate forcings including increasing greenhouse gas abundances and changing sea surface temperatures.

publication date

  • December 1, 2013

has restriction

  • hybrid

Date in CU Experts

  • June 24, 2021 8:35 AM

Full Author List

  • Albers JR; Nathan TR

author count

  • 2

Other Profiles

International Standard Serial Number (ISSN)

  • 0022-4928

Electronic International Standard Serial Number (EISSN)

  • 1520-0469

Additional Document Info

start page

  • 3977

end page

  • 3994

volume

  • 70

issue

  • 12