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Ground‐based FTIR measurements of CLONO 2 Vertical column amounts in the Arctic
Author(s) -
Notholt J.,
Clarmann T.V.,
Adrian G. P.,
Schrems O.
Publication year - 1994
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 - 10.1029/93gl01785
Subject(s) - stratosphere , polar vortex , zenith , middle latitudes , atmospheric sciences , arctic , atmosphere (unit) , polar , environmental science , analytical chemistry (journal) , geology , meteorology , physics , chemistry , geodesy , environmental chemistry , oceanography , astronomy
During the EASOE campaign measurements have been performed in March at Ny‐Ålesund (79°N, 11°E) by high resolution FTIR spectroscopy to derive the vertical column amounts of ClONO 2 . For the first part of this period the polar vortex was found to be situated above Ny‐Ålesund. The measurements give ClONO 2 zenith column amounts of about 3.9×10 15 mol cm −2 outside the polar vortex, much higher than midlatitude values for an undisturbed atmosphere. Inside the vortex strong variabilities with burdens between 2.8 and 6.8×10 15 mol cm −2 were observed. These high values might be explained by the reaction of ClO with NO 2 and the relatively warm stratosphere ensuring that the ClONO 2 so formed remains in the gas phase.