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Summertime surface O 3 behavior and deposition to tundra in the Alaskan Arctic
Author(s) -
Van Dam Brie,
Helmig Detlev,
Doskey Paul V.,
Oltmans Samuel J.
Publication year - 2016
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2015jd023914
Subject(s) - tundra , snow , deposition (geology) , atmospheric sciences , diurnal cycle , daytime , arctic , environmental science , diurnal temperature variation , climatology , snowmelt , boundary layer , seasonality , planetary boundary layer , meteorology , geology , turbulence , oceanography , geography , geomorphology , ecology , physics , sediment , biology , thermodynamics
Atmospheric turbulence quantities, boundary layer ozone (O 3 ) levels, and O 3 deposition to the tundra surface were investigated at Toolik Lake, AK, during the 2011 summer season. Beginning immediately after snowmelt, a diurnal cycle of O 3 in the atmospheric surface layer developed with daytime O 3 maxima, and minima during low‐light hours, resulting in a mean amplitude of 13 ppbv. This diurnal O 3 cycle is far larger than observed at other high Arctic locations during the snow‐free season. During the snow‐free months of June, July, and August, O 3 deposition velocities were ∼3 to 5 times faster than during May, when snow covered the ground most of the month. The overall mean O 3 deposition velocity between June and August was 0.10 cm s −1 . The month of June had the highest diurnal variation, with a median O 3 deposition velocity of 0.2 cm s −1 during the daytime and 0.08 cm s −1 during low‐light conditions. These values are slightly lower than previously reported summertime deposition velocities in northern latitudes over tundra or fen. O 3 loss during low‐light periods was attributed to a combination of surface deposition to the tundra and stable boundary layer conditions. We also hypothesize that emissions of reactive biogenic volatile organic compounds into the shallow boundary layer may contribute to nighttime O 3 loss.