An overview of millimeter-wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February-March, 1992: Vertical profiles, diurnal variation, and longer-term trends
- State Univ. of New York, Stony Brook, NY (United States)
Measurements of chlorine monoxide in the stratosphere over Thule, Greenland (76.3N, 68.4W) were made quasi-continuously during the period February 8 to March 24, 1992, using a high-sensitivity ground based mm-wave spectrometer. These observations give diurnal, short term, and long term changes in the mixing ratio and vertical distribution of ClO. At an equivalent time after the Antarctic winter solstice, very large concentrations (up to [approximately]1.5 ppbv) occur in lower stratospheric ClO, resulting in massive ozone destruction. The authors saw no evidence for large ([approximately]1 to 1.5 ppbv) amounts of ClO in the 16-25 km range over Thule in February or March, in agreement with UARS (satellite) observations by the MLS mm-wave spectrometer for this period, and in marked contrast to UARS/MLS and ER-2 aircraft measurements over northern Europe and eastern Canada, respectively, during January, 1992. The authors have evidence for smaller enhancements ([approximately]0.2 to 0.5 ppbv) in the 18-30 km range during late February-early March, which could result from transport of residual low NO[sub 2] air following earlier PSC processing (the last of which occurred at least one month earlier, however) or the result of chemical processing by Pinatubo aerosols. Direct influence of Pinatubo aerosols on Arctic ozone during the spring of 1992 has been difficult to assess, and this enhancement of low-altitude ClO might be a significant indicator of aerosol effects. 14 refs., 3 figs., 1 tab.
- OSTI ID:
- 6863228
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 21:13; ISSN GPRLAJ; ISSN 0094-8276
- Country of Publication:
- United States
- Language:
- English
Similar Records
N[sub 2]O as an indicator of Arctic vortex dynamics: Correlations with O[sub 3] over Thule, Greenland in February and March, 1992
Measurement and analysis of polar stratospheric ClO and N2O by ground-based mm-wave spectroscopy. Ph.D. Thesis