Abstract
Abstract. A differential absorption lidar (DIAL) for measurement of atmospheric ozone concentration was operated aboard the Polar 5 research aircraft in order to study the depletion of ozone over Arctic sea ice. The lidar measurements during a flight over the sea ice north of Barrow, Alaska, on 3 April 2011 found a surface boundary layer depletion of ozone over a range of 300 km. The photochemical destruction of surface level ozone was strongest at the most northern point of the flight, and steadily decreased towards land. All the observed ozone-depleted air throughout the flight occurred within 300 m of the sea ice surface. A back-trajectory analysis of the air measured throughout the flight indicated that the ozone-depleted air originated from over the ice. Air at the surface that was not depleted in ozone had originated from over land. An investigation into the altitude history of the ozone-depleted air suggests a strong inverse correlation between measured ozone concentration and the amount of time the air directly interacted with the sea ice.
Highlights
It has been observed that ozone becomes depleted in air near the sea ice surface during the polar sunrise period in the Arctic (e.g., Oltmans, 1981; Oltmans and Komhyr, 1986; Bottenheim et al, 1986; Barrie et al, 1988, 1989; Seabrook et al, 2011) as well as the Antarctic (Jones et al, 2010)
In order to investigate spatial structure of Arctic surface ozone depletion events, a differential absorption, light detection and ranging instrument for the measurement of tropospheric ozone was operated from the Polar 5 reSseoarlcihdaEircararftth(Basler BT-67: rebuilt and modernized DC-3) as part of the PAMARCMIP
The airborne differential absorption lidar (DIAL) measurements from the flight beginning on 2 April 2011 provided a continuous record of the vertical structure of a surface ozone depletion event over a horizontal range of 300 km
Summary
It has been observed that ozone becomes depleted in air near the sea ice surface during the polar sunrise period in the Arctic (e.g., Oltmans, 1981; Oltmans and Komhyr, 1986; Bottenheim et al, 1986; Barrie et al, 1988, 1989; Seabrook et al, 2011) as well as the Antarctic (Jones et al, 2010). In order to investigate spatial structure of Arctic surface ozone depletion events, a differential absorption, light detection and ranging instrument (differential absorption lidar, or DIAL) for the measurement of tropospheric ozone was operated from the Polar 5 reSseoarlcihdaEircararftth(Basler BT-67: rebuilt and modernized DC-3) as part of the PAMARCMIP. The observed structure of the surface ozone depletion events along the flight track provided a unique view that has been applied to assess the conditions in which the ozone depletion events occur
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