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An overview of millimeter‐wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February–March, 1992: Vertical profiles, diurnal variation, and longer‐term trends

Publication ,  Journal Article
de Zafra, RL; Emmons, LK; Reeves, JM; Shindell, DT
Published in: Geophysical Research Letters
January 1, 1994

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 ∼1.5 ppbv) occur in lower stratospheric ClO, resulting in massive ozone destruction. We saw no evidence for large (∼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. We have evidence for smaller enhancements (∼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 NO2 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. Copyright 1994 by the American Geophysical Union.

Duke Scholars

Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

January 1, 1994

Volume

21

Issue

13

Start / End Page

1271 / 1274

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

Citation

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de Zafra, R. L., Emmons, L. K., Reeves, J. M., & Shindell, D. T. (1994). An overview of millimeter‐wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February–March, 1992: Vertical profiles, diurnal variation, and longer‐term trends. Geophysical Research Letters, 21(13), 1271–1274. https://doi.org/10.1029/93GL01677
Zafra, R. L. de, L. K. Emmons, J. M. Reeves, and D. T. Shindell. “An overview of millimeter‐wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February–March, 1992: Vertical profiles, diurnal variation, and longer‐term trends.” Geophysical Research Letters 21, no. 13 (January 1, 1994): 1271–74. https://doi.org/10.1029/93GL01677.
de Zafra, R. L., et al. “An overview of millimeter‐wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February–March, 1992: Vertical profiles, diurnal variation, and longer‐term trends.” Geophysical Research Letters, vol. 21, no. 13, Jan. 1994, pp. 1271–74. Scopus, doi:10.1029/93GL01677.
Journal cover image

Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

January 1, 1994

Volume

21

Issue

13

Start / End Page

1271 / 1274

Related Subject Headings

  • Meteorology & Atmospheric Sciences