OH and OH Reactivity Measurements during the OASIS Campaign at Barrow, Alaska
Abstract
The OASIS study provided a rare opportunity to observe OH chemistry in an Arctic environment over a long term. Few measurements of OH exist during phenomena such as the occurrence of Arctic haze or ozone depletion events (ODE’s). Here we present measurements of OH and OH reactivity using the NCAR Sulfuric, OH, and MSA instrument (SUOMI) CIMS. OH showed a typical diurnal variability with peak high sun values of 2-4x10^6 molecule cm-3. High sun values during ODE’s were on the order of 2-3x10^5 molecule cm-3, indicating a secondary source of OH. Total OH reactivity was observed using a standard flow tube scheme with the SUOMI CIMS detection technique. The method involves generating OH by flowing an N2/H2O mixture past an Hg lamp and then introducing it into an ambient air filled flow tube at varying distances from the detection inlet. Reactivity measurements were conducted from 23 March to 13 April 2009, during which several ODEs occurred. The results of these measurements are presented and discussed.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2009
- Bibcode:
- 2009AGUFM.A31C0113M
- Keywords:
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- 0365 ATMOSPHERIC COMPOSITION AND STRUCTURE / Troposphere: composition and chemistry;
- 0394 ATMOSPHERIC COMPOSITION AND STRUCTURE / Instruments and techniques;
- 9315 GEOGRAPHIC LOCATION / Arctic region