Measurements of JNO3- in snow by nitrate-based actinometry
Document Type
Conference Proceeding
Publication Date
6-2002
Department
Department of Chemistry; Department of Civil, Environmental, and Geospatial Engineering
Abstract
Chemical actinometry was used to measure nitrate photolysis rate coefficients, JNO3-, on and in snowpack at Summit, Greenland. Sealed glass tubes containing nitrate and a hydroxyl radical trapping system were buried in snow and exposed for between 2 and 24h. Average JNO3- values for 2-h midday exposures in early June on surface snow were 10-14×10-7s-1. Averages over 24h were 3.5-4.5×10-7s-1. These values reflect the integrated photon flux and also any variation of the nitrate photolysis rate with temperature. Attenuation of JNO3- within the firn was 0.03-0.04cm-1 for 24-h exposures and 0.08cm-1 for a 2-h exposure. Different attenuation coefficients may relate to differential light penetration due to changes in sun angle over the course of 24h.
Publication Title
Atmospheric Environment
Recommended Citation
Qiu, R.,
Green, S.,
Honrath, R.,
Peterson, M.,
Lu, Y.,
&
Dziobak, M.
(2002).
Measurements of JNO3- in snow by nitrate-based actinometry.
Atmospheric Environment,
36(15-16), 2563-2571.
http://doi.org/10.1016/S1352-2310(02)00117-6
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/7660