In situ observations of ClO in the Arctic stratosphere: ER-2 aircraft results from 59 degree N to 80 degree N latitude

Journal Article · Wed Feb 28 23:00:00 EST 1990 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/GL017i004p00505· OSTI ID:5329429

Brune, W H ^[1]; Toohey, D W; Anderson, J G ^[2]; Chan, K R ^[3]

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1. Pennsylvania State Univ., University Park (USA)
2. Harvard Univ., Cambridge, MA (USA)
3. NASA Ames Research Center, Moffett Field, CA (USA)

Large abundances of ClO were observed inside the Arctic polar vortex during 14 flights of the NASA ER-2 aircraft from Stavanger, Norway (59{degree}N, 6{degree}E) to 80{degree}N latitude. Flights were conducted at altitudes between 14 and 20 km when the solar zenith angle was between 70{degree} and 101{degree}. Data are reported for three flights, January 6, January 16, and February 10, that represent the main features observed during the mission. ClO mixing ratios were typically less than 50 parts per trillion by volume (pptv) outside the vortex and exceeded 100 pptv inside the vortex for all flights. ClO mixing ratios were more than 500 pptv for four days in a row in early February, reaching 1,130 pptv on February 10, at an altitude of 19 km (potential temperature of 460 K). Peak ClO mixing ratios in early February were {approximately}100 times larger than those observed at mid-latitudes for all altitudes surveyed between 15 and 19 km. These data, comparable to those obtained in the Antarctic ozone hole, indicate that the springtime Arctic polar vortex was extensively perturbed by heterogeneous chemistry and contained enough ClO to catalytically destroy ozone rapidly.

• OSTI ID: 5329429
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 17:4; ISSN GPRLA; ISSN 0094-8276
• Country of Publication: United States
• Language: English

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