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GEOPHYSICAL RESEARCH LETTERS,
VOL. 28, NO. 19,
PP. 3633-3636, 2001
doi:10.1029/2001GL013158
An investigation of South Pole HOx chemistry: Comparison of model results with ISCAT observations
Georgia Institute of Technology, Atlanta
Georgia Institute of Technology, Atlanta
NASA Langley Research Center, Hampton, Virginia
Georgia Institute of Technology, Atlanta
National Center for Atmospheric Research, Boulder, Colorado
National Center for Atmospheric Research, Boulder, Colorado
Georgia Institute of Technology, Atlanta
Sonoma Technology, Inc., Golden, Colorado
National Center for Atmospheric Research, Boulder, Colorado
National Center for Atmospheric Research, Boulder, Colorado
New Mexico State University, Carlsbad
Geochemical Sciences Division, Hanover, New Hampshire
University of California, Irvine, Irvine
Unexpected high levels of OH and NO were recorded at the South Pole (SP) Atmospheric Research Observatory during the 1998–99 ISCAT field study. Model simulations suggest a major photochemical linkage between observed OH and NO. A detailed comparison of the observations with model predictions revealed good agreement for OH at NO levels between 120 and 380 pptv. However, the model tended to overestimate OH for NO levels <120 pptv, while it underestimated OH at levels >380 pptv. The reasons for these deviations appear not to involve NO directly but rather HOx radical scavenging for the low NO conditions and additional HOx sources for the high NO conditions. Because of the elevated levels of NO and highly activated HOx photochemistry, the SP was found to be a strong net source of surface ozone. It is quite likely that the strong oxidizing environment found at the South Pole extends over the entire polar plateau.
Received 9 March 2001; accepted 7 July 2001; .
Citation: (2001), An investigation of South Pole HOx chemistry: Comparison of model results with ISCAT observations, Geophys. Res. Lett., 28(19), 3633–3636, doi:10.1029/2001GL013158.
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