TY - JOUR
T1 - Ozone in the Arctic lower troposphere during winter and spring 2000 (ALERT2000)
AU - Bottenheim, Jan W.
AU - Fuentes, Jose D.
AU - Tarasick, David W.
AU - Anlauf, Kurt G.
N1 - Funding Information:
The authors wish to thank Paul Shepson (Purdue University) for many stimulating discussions, John McIver and John Kivisto (MSC-Alert) for their excellent job in handling the ozone sonde flights, Jonathan Davies, Kathy Hayden and Maurice Watt for quality assurance and quality control of the sonde and surface ozone data, Sandy Steffen (Hg), Doug Worthy (CO), Sangeeta Sharma (black carbon), Lori Leeder (GAW station meteorology), and Harold Beine (NO y ) for providing us with data used in Figs. 3 and 5 , and the personnel at CFS Alert for general logistical support. Above all, we thank Alan Gallant without whose tireless efforts ALERT2000 would never have taken place. JDF acknowledges support from the National Science Foundation (Grant No. OPP-0000173) to participate in the ALERT2000 project.
PY - 2002
Y1 - 2002
N2 - A summary of the temporal and vertical characteristics of ozone in the Arctic boundary layer as observed during winter and spring 2000 near Alert, Nunavut, Canada (82°N, 62°W) is presented. The measurements were made during the Polar Sunrise Experiments ALERT2000. Particular attention is given to identifying chemical and atmospheric characteristics of short-lived (<2 days) ozone depletion events that occur during dark and sunlit periods in the Arctic boundary layer. During these events the atmospheric boundary layer becomes turbulent and as a result atmospheric layers aloft, exceeding 100m in depth, can become fully devoid of ozone. It is shown that these depletion episodes are often associated with air masses, whose origin is primarily in Eurasia, laden with chemical species of anthropogenic origin. Nevertheless, it is postulated that ozone depletion is largely driven by halogen chemistry, in particular involving bromine compounds, and this occurs during the transport of air masses across the Arctic Ocean. A detailed analysis of a period in mid April suggests that, later in the season during 24-h sunlit periods, locally occurring ozone depletion chemistry is an important process, and we speculate that photolysis of bromoform of marine origin is the fuse that starts a local "bromine explosion". A severe ozone depletion episode occurred in late April. During this prolonged episode, lasting 14 consecutive days, the atmospheric column extending from the surface to about 1400m remained almost completely free of ozone. We present and discuss evidence that atmospheric thermodynamics and air mass transport history explain the dynamics of ozone depletion episodes in the high Arctic. Crown
AB - A summary of the temporal and vertical characteristics of ozone in the Arctic boundary layer as observed during winter and spring 2000 near Alert, Nunavut, Canada (82°N, 62°W) is presented. The measurements were made during the Polar Sunrise Experiments ALERT2000. Particular attention is given to identifying chemical and atmospheric characteristics of short-lived (<2 days) ozone depletion events that occur during dark and sunlit periods in the Arctic boundary layer. During these events the atmospheric boundary layer becomes turbulent and as a result atmospheric layers aloft, exceeding 100m in depth, can become fully devoid of ozone. It is shown that these depletion episodes are often associated with air masses, whose origin is primarily in Eurasia, laden with chemical species of anthropogenic origin. Nevertheless, it is postulated that ozone depletion is largely driven by halogen chemistry, in particular involving bromine compounds, and this occurs during the transport of air masses across the Arctic Ocean. A detailed analysis of a period in mid April suggests that, later in the season during 24-h sunlit periods, locally occurring ozone depletion chemistry is an important process, and we speculate that photolysis of bromoform of marine origin is the fuse that starts a local "bromine explosion". A severe ozone depletion episode occurred in late April. During this prolonged episode, lasting 14 consecutive days, the atmospheric column extending from the surface to about 1400m remained almost completely free of ozone. We present and discuss evidence that atmospheric thermodynamics and air mass transport history explain the dynamics of ozone depletion episodes in the high Arctic. Crown
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U2 - 10.1016/S1352-2310(02)00121-8
DO - 10.1016/S1352-2310(02)00121-8
M3 - Article
AN - SCOPUS:0036576284
SN - 1352-2310
VL - 36
SP - 2535
EP - 2544
JO - Atmospheric Environment
JF - Atmospheric Environment
IS - 15-16
ER -