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Sunrise ozone destruction found in the sub‐tropical marine boundary layer
Author(s) -
Nagao Ippei,
Matsumoto Kiyoshi,
Tanaka Hiroshi
Publication year - 1999
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 - 10.1029/1999gl010836
Subject(s) - sunrise , ozone , ozone depletion , atmospheric sciences , sunset , environmental science , ozone layer , daytime , climatology , meteorology , oceanography , geology , geography , physics , astronomy
A new mechanism of ozone loss is found in the sub‐tropical marine boundary layer over the north Pacific. This ozone destruction occurs just after sunrise (hereafter Sunrise Ozone Destruction, SOD) and is commonly found throughout the year. SOD is a predominant ozone loss mechanism in winter, which takes place after sunrise in a few hours with 1∼2 ppbv of ozone depletion for 40∼50 ppbv of background ozone, while, in summer, SOD is weaker than in winter with small ozone depletion for 10∼20 ppbv of background ozone. In summer, daytime ozone destruction (hereafter, DOD) associated with UV photolysis and subsequent HO x reaction is more active. Since DOD is not active in early morning, SOD should be a new ozone loss mechanism. After demonstrating the observational findings, halogen chemistry associated with sea‐salt aerosols is described as a possible mechanism.