GEOPHYSICAL MONOGRAPH SERIES, VOL. 190, PP. 1-3, 2010
Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland, USA
Department of Applied Physics and Applied Mathematics and Department of Earth and Environmental Sciences, Columbia University, New York, New York, USA
Over the past few decades there has been intensive research into the Earth's stratosphere, which has resulted in major advances
in our understanding of its dynamics, transport, and chemistry and its coupling with other parts of the atmosphere. This interest
in the stratosphere was originally motivated by concerns regarding the stratospheric ozone layer, which plays a crucial role
in shielding Earth's surface from harmful ultraviolet light. In the 1980s the depletion of ozone was first observed, with
the Antarctic ozone hole being the most dramatic example, and then linked to increases in chlorofluorocarbons (CFCs). These
findings led to the signing of the Montreal Protocol, which regulates the production of CFCs and other ozone-depleting substances.
Over the subsequent decades, extensive research has led to a much better understanding of the controls on stratospheric ozone
and the impact of changes in CFC abundance (including the recovery of the ozone layer as the abundance of CFCs returns to
historical levels). More recently, there has been added interest in the stratosphere because of its potential impact on surface
climate and weather. This surface impact involves changes in the radiative forcing, the flux of ozone and other trace constituents
into the troposphere, and dynamical coupling.
Citation: Waugh, D. W., and