NDLI: Boundary Layer Ozone in the Tropical America Northern Hemisphere Region

Content Provider	Springer Nature Link
Author	Sanhueza, Eugenio Fernández, Enmanuel Doso, Loreto Romero, Johnny
Copyright Year	2000
Abstract	In recent field campaigns, boundary layer ozone concentrations were measuredat different sites in the Orinoco river basin (mainly savannahs) and nearbylocations (cloud forest and coastal sites), during dry and wet seasons. Theresults provide a comprehensive description of boundary layer ozone in atropical region north of the equator where scarce information is available.Ozone measurements were made using photometric ozone analyzers. In thesavannah region, ozone profiles (up to 1000 m) were also obtained usingelectrochemical concentration cell sondes, launched in a tethered balloon.The results, in comparison with other parts of the world, confirm the lowvalues for the concentration of ozone in the boundary layer of the studyregion. Throughout the entire region (marine, coastal, and continental areas),higher concentrations were produced during the dry season (20–30 ppbv)than during the wet season (13–17 ppbv), likely due to the photochemicalproduction of ozone from biomass burning emissions. This seasonal variationobserved in the boundary layer contrasts with satellite data, that show highertotal tropospheric ozone columns during the wet season in the 0–15°Nregion; this means that the ozone annual cycles in the boundary layer and freetroposphere are out of phase.At the most pristine continental sites in the southern part of Venezuela,quite a `peculiar' diurnal variation was observed, with maximum concentrationsin the morning and a steady decrease of ∼0.6 ppbv hr$^{-1}$ duringthe hours of high solar irradiation. Although dynamic aspects cannot be ruledout, the daytime ozone decrease, which cannot be explained by thewell-established `classical' continental O$_{3}$ sinks, suggests thatin this region part of the ozone consumption is caused byHO$_{ x }$ cycles at low NO$_{ x }$ levels. Futurestudies to elucidate the causes of the daytime ozone decrease at thesecontinental sites should be undertaken.
Starting Page	249
Ending Page	272
Page Count	24
File Format	PDF
ISSN	01677764
Journal	Journal of Atmospheric Chemistry
Volume Number	35
Issue Number	3
e-ISSN	15730662
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Meteorology/Climatology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Atmospheric Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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