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The regime of decreased OH vertical column abundances at Fritz Peak Observatory, CO: 1991–1995
Author(s) -
Burnett Clyde R.,
Burnett Elizabeth 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 - 10.1029/96gl01811
Subject(s) - solar zenith angle , observatory , zenith , atmospheric sciences , morning , abundance (ecology) , environmental science , column (typography) , water column , meteorology , geology , physics , geodesy , oceanography , astrophysics , astronomy , geometry , connection (principal bundle) , fishery , biology , mathematics
The 18‐year data base for vertical column abundance measurements of atmospheric OH at Fritz Peak Observatory, Colorado (40°N, 105°W), exhibits a relatively abrupt change in seasonal behavior during 1991 through 1995. Late summer through early fall abundances, especially, for each year of the 1991–1995 period are significantly below the comparable seasonal average for 1980–1990. Early morning abundances for August through October at solar zenith angles greater than 45° exibit an average reduction of about 0.8 × 10 13 /cm², which at a solar zenith angle of 60° is a 15% column decrease.