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Mid‐latitude observations of the seasonal variation of BrO 1. Zenith‐sky measurements
Author(s) -
Aliwell S. R.,
Jones R. L.,
Fish D. J.
Publication year - 1997
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 - 10.1029/97gl01165
Subject(s) - zenith , sunrise , sky , atmospheric sciences , latitude , bromine , seasonality , environmental science , polar vortex , solar zenith angle , middle latitudes , sunset , polar night , polar , climatology , meteorology , troposphere , geology , stratosphere , geodesy , physics , chemistry , astronomy , statistics , mathematics , organic chemistry
Zenith‐sky observations of the seasonal evolution of BrO slant columns above Aberdeen (57°N) between November 1994 and April 1995 are presented. The measurements show maximum differential BrO slant columns (90°–81°) of 2.4 × 10 14 molecules cm −2 in January, decreasing to 1 × 10 14 in spring. On a seasonal timescale, BrO slant columns are anticorrelated with NO 2 slant columns, which is qualitatively consistent with BrONO 2 being the main nighttime bromine reservoir. There is some evidence for a small (5 × 10 13 molecules cm −2 ) increase in sunrise BrO slant columns inside the polar vortex, following chlorine activation on PSCs, as shown by measurements of large OClO slant columns.