Solar photolysis of ozone to singlet D oxygen atoms, O(/sup 1/D)

Thesis/Dissertation · Sat Dec 31 23:00:00 EST 1983

OSTI ID:6111171

Blackburn, T E

Ground level solar photolysis rate coefficients (jO/sub 3/) were measured for the photolysis of ozone by sunlight, (O/sub 3/ + hnu(< 320 nm) ..-->.. O/sub 2/ + O(/sup 1/D)). The O(/sup 1/D) atoms produced react with nitrous oxide (N/sub 2/O) carrier gas to form higher oxides of nitrogen (NOx). Computer model predictions show that these are mainly N/sup 2/O/sub 5/ and NO/sub 3/. Seventy five days of data were taken during the summer of 1983, at Ann Arbor, Michigan, and are presented in the appendix. Over 390 clear air jO/sub 3/ values are correlated with effective ozone column densities, and 500 nm aerosol optical depths. The solar direct beam component of ozone photolysis was measured for the different aerosol optical depths, over two entire days from sun-up to sun-down. Temperature dependence of jO/sub 3/ was measured from 10/sup 0/C to 39/sup 0/C with good agreement to models. Comparison of jO/sub 3/ versus global and ultraviolet radiation are made under various ozone column densities and aerosol optical depths. A jO/sub 3/-photometer was built using an interference filter to pass only ozone photolyzing light. Improvements to instrumental parts are shown for balloon and aircraft flyable payloads.

• Research Organization: Michigan Univ., Ann Arbor (USA)
• OSTI ID: 6111171
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring &amp; Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DAILY VARIATIONS
DECOMPOSITION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
MATHEMATICAL MODELS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHYSICAL PROPERTIES
RADIATIONS
SOLAR RADIATION
STELLAR RADIATION
TEMPERATURE DEPENDENCE
VARIATIONS