Measurement of tracers in the troposphere and lower stratosphere;
interactions of chemistry and dyanmics and trop-strat exchange
Studies of the chemistry and dynamics of the polar stratosphere,
including the nature of PSC’s and their effects on the chemisty
Determination of long term changes in the chemistry of the stratosphere,
in particular the effects of changing halogen inputs in the post Montreal
Protocol era
Activities
Participation in the Polar Aura Validation Experiment
(PAVE) in January- February 2005, to measure, from an aircraft platform, column amounts and profiles
of upper tropospheric and lower stratospheric gases coincident with observations by the four remote
sounding experiments aboard the NASA Aura spacecraf
A month-long deployment (March 2006) to a surface site near Mexico City to measure throughout
the day a number of gases important to the tropospheric chemistry of the region in connection with
the MIRAGE field program
Participation in TOPSE
on the C-130 (spring 2000) to measure CO in the springtime free troposphere and
help determine its sources, transport, and oxidation; use of N2O concentration for diagnostics
of winter and springtime intrusion of stratospheric ozone into the free troposphere.
Participation in
SOLVE airborne polar mission (winter 1999-2000) to measure the infrared extinction
spectra of stratospheric aerosols and PSC’s to deduce the physical and chemical nature of
the particles and to measure columns of trace gases to determine the effect of the aerosols
on the trace gas chemistry.
Deployment and long term operation of high resolution spectrometer at Thule, Greenland; analysis
of change in columns and profiles of trace gases during the year and determination of chemical
transformations by correlation of measurements with dynamics and with history of presence of
aerosols.
