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William J. Randel

Editor, JGR Atmospheres

Diagrams showing simulated near-surface temperature changes.
Posted inEditors' Highlights

Modeling Stratosphere-Troposphere Coupling in a Changing Climate

by William J. Randel and Gang Chen 18 October 202214 October 2022

Climate models have disagreed on the future evolution of the stratospheric polar vortex and links to the troposphere, but a new study revisits this problem with state-of-the-art climate models.

Image showing composite polar vortex structure for disturbed conditions.
Posted inEditors' Highlights

Simulating Surface Impacts of Stratospheric Sudden Warmings

by William J. Randel 10 June 202221 December 2022

New evaluations of climate model simulations show how the stratosphere polar vortex couples to surface weather.

Trends in stratospheric fluorine species during the period 2004-2018.
Posted inEditors' Highlights

New Insights on Stratospheric Circulation from Fluorine Tracers

by William J. Randel 23 November 20218 June 2022

Stratospheric fluorine species have accumulated faster in the Northern Hemisphere over the past two decades reflecting interhemispheric differences in the Brewer-Dobson transport circulation.

Map of south and southeast Asia showing the near-surface origins of ‘fast’ airmass trajectories connecting the surface and the upper troposphere/lower stratosphere
Posted inEditors' Highlights

Measurements of Ozone-Depleting Chemicals in the Asian Monsoon

by William J. Randel 10 February 202119 September 2022

New high-altitude aircraft observations identify unexpected high levels of halogen-containing species entering the stratosphere above the summertime Asian monsoon.

Altitude versus longitude cross sections of relative vorticity
Posted inEditors' Highlights

Novel Simulations of Upper Atmosphere Gravity Wave Dynamics

by William J. Randel 25 February 202019 October 2021

Gravity waves play a key role in driving upper atmosphere circulations but are poorly understood. New high-resolution simulations are resolving complex wave behaviors with unprecedented detail.

Satellite measures of the impact of large boreal forest fires on ozone
Posted inEditors' Highlights

Satellite Measurements of Stratospheric Forest Fire Smoke

by William J. Randel 6 December 201918 November 2022

Intense boreal forest fires in August 2017 caused smoke plumes that reached record levels in the stratosphere; satellite measurements show that the effects rivaled a moderate volcanic eruption.

Map of continental USA showing horizontal distribution of the mean of the logarithmic eddy dissipation rate in the troposphere
Posted inEditors' Highlights

Radiosondes Measure Atmospheric Turbulence Over North America

by William J. Randel 16 August 201925 July 2022

Analyses of high-resolution radiosonde balloon measurements have provided a novel climatology of atmospheric turbulence parameters in the troposphere and lower stratosphere.

Posted inEditors' Highlights

New Lidar Comparisons of Temperatures Near the Mesopause

by William J. Randel 22 October 20187 March 2022

For the first time, simultaneous measurements of upper atmosphere temperatures over altitudes 80 to 110 kilometers have been made by two complementary lidar techniques.

Posted inEditors' Highlights

New Characterization of the Mesospheric Polar Vortices

by William J. Randel 2 October 201829 March 2022

Polar vortices play a central role in coupling the atmosphere from the ground to the middle atmosphere. New satellite diagnostics describe mesospheric polar vortices and coupling to lower altitudes.

Posted inEditors' Highlights

Continental Convection Reaches New Highs

by William J. Randel 12 March 201829 March 2022

Ten years of high-resolution gridded NEXRAD radar data provide a new data set to quantify tropopause-overshooting convection over the continental United States.

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