Total equivalent chlorine in the stratosphere: 1991-2003.
Abstract
Since 1991, NOAA scientists have operated four airborne gas chromatographs on NASA airborne platforms, including the NASA Jet Propulsion Laboratory (JPL) balloon gondola and ER-2, WB-57F, and DC-8 aircraft. Using these in situ measurem(1) National Oceanic and Atmospheric Administration (NOAA)/Climate Monitoring Diagnostics Laboratory (CMDL), (2) Cooperative Institute for Research in Environmental Science (CIRES), (3) NOAA/Aeronomy Laboratoryents and tracer-tracer correlations from observations for the unmeasured halogen species (HCFCs and methyl halides including methyl chloride and bromide), we have estimated trends of total chlorine and bromine in the stratosphere. The determination of inorganic equivalent chlorine (Cl + 45*Br) requires the trend of tropospheric equivalent chlorine and the mean age of the parcel of stratospheric air. Tropospheric trends of the methyl halides have been recently complied against stable standards. We operated a new airborne gas chromatograph on the Sage 3 Ozone Loss Validation Experiment (SOLVE-II) mission from Kiruna, Sweden. It measures the major HCFCs and methyl halides, so that these compounds do not have to be estimated from tracer-tracer correlations in the future. This presentation will show our estimates of total equivalent chlorine trends since 1991.
- Publication:
-
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003
- Bibcode:
- 2003EAEJA....13452E