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

Abstract

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 themore » 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.« less

Authors:
; ; ;  [1]
  1. (State Univ. of New York, Stony Brook, NY (United States))
Publication Date:
OSTI Identifier:
6863228
Alternate Identifier(s):
OSTI ID: 6863228
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geophysical Research Letters (American Geophysical Union); (United States); Journal Volume: 21:13
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CHLORINE OXIDES; ECOLOGICAL CONCENTRATION; ARCTIC REGIONS; STRATOSPHERE; CHALCOGENIDES; CHLORINE COMPOUNDS; CRYOSPHERE; EARTH ATMOSPHERE; HALOGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLAR REGIONS 540120* -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-)

Citation Formats

Zafra, R.L. de, Emmons, L.K., Reeves, J.M., and Shindell, D.T.. An overview of millimeter-wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February-March, 1992: Vertical profiles, diurnal variation, and longer-term trends. United States: N. p., 1994. Web. doi:10.1029/93GL01677.
Zafra, R.L. de, Emmons, L.K., Reeves, J.M., & Shindell, D.T.. An overview of millimeter-wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February-March, 1992: Vertical profiles, diurnal variation, and longer-term trends. United States. doi:10.1029/93GL01677.
Zafra, R.L. de, Emmons, L.K., Reeves, J.M., and Shindell, D.T.. Wed . "An overview of millimeter-wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February-March, 1992: Vertical profiles, diurnal variation, and longer-term trends". United States. doi:10.1029/93GL01677.
@article{osti_6863228,
title = {An overview of millimeter-wave spectroscopic measurements of chlorine monoxide at Thule, Greenland, February-March, 1992: Vertical profiles, diurnal variation, and longer-term trends},
author = {Zafra, R.L. de and Emmons, L.K. and Reeves, J.M. and Shindell, D.T.},
abstractNote = {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.},
doi = {10.1029/93GL01677},
journal = {Geophysical Research Letters (American Geophysical Union); (United States)},
number = ,
volume = 21:13,
place = {United States},
year = {Wed Jun 22 00:00:00 EDT 1994},
month = {Wed Jun 22 00:00:00 EDT 1994}
}