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OClO, NO 2 and O 3 total column observations over Iceland during the winter 1993/94
Author(s) -
Gil M.,
Puentedura O.,
Yela M.,
Parrondo C.,
Jadhav D. B.,
Thorkelsson B.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl03102
Subject(s) - stratosphere , ozone , atmospheric sciences , environmental science , arctic , ozone depletion , twilight , polar vortex , ozone layer , climatology , the arctic , meteorology , physics , geology , oceanography , astronomy
Ground‐based observation of OClO, NO 2 , and O 3 columns by differential UV‐Visible spectroscopy at twilight during the fall winter of 1993/94 at the sub‐Arctic station of Reykjavik (64°N, 23°W) are presented. Results show no direct evidence of ozone depletion during the period but significant amounts of OClO were observed in December and January when NO 2 abundances were at the annual minimum. NO 2 columns are found to be controlled by the hours of light available but highly modulated by the lower stratosphere temperature. OClO was observed outside the vortex as well, but only at times when NO 2 was low.