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Dominant Presence of Oxygenated Organic Species in the Remote Southern Hemisphere TroposphereOxygenated organic species are intimately involved with the fate of nitrogen oxides (NO(sub x)) and hydrogen oxides (HO(sub x)), which are necessary for tropospheric ozone formation. A recent airborne experiment (March-April, 1999) focused over the southern hemisphere (SH) Pacific Ocean (PEM-tropics-B) provided a first opportunity for a detailed characterization of the oxygenated organic composition of the remote southern hemisphere troposphere. Three co-located multi-channel airborne instruments measured a dozen key oxygenated species (carbonyls, alcohols, organic nitrates, organic pernitrates, peroxides) along with a comprehensive suite of C2-C8 Nonmethane hydrocarbons (NMHC). These measurements reveal that in the tropical SH (0-30 deg south), oxygenated chemical abundances are extremely large and collectively are nearly five times those of NMHC. Even in the NH remote atmospheres their burden is equal to or greater than that of NMHC. The relatively uniform global distribution oxygenates (EPSILON Ox-org) is indicative of the presence of large natural and distributed sources. A global 3-D model, reflecting the present state of science, is unable to correctly simulate the atmospheric distribution and variability of several of these species.
Document ID
20010003453
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Singh, H.
(NASA Ames Research Center Moffett Field, CA United States)
Chen, Y.
(NASA Ames Research Center Moffett Field, CA United States)
Staudt, A.
(Harvard Univ. Cambridge, MA United States)
Jacob, D.
(Harvard Univ. Cambridge, MA United States)
Blake, D.
(California Univ. Irvine, CA United States)
Heikes, B.
(Rhode Island Univ. Narragansett, RI United States)
Snow, J.
(Rhode Island Univ. Narragansett, RI United States)
Hipskind, R. Stephen
Date Acquired
August 20, 2013
Publication Date
January 1, 2000
Subject Category
Environment Pollution
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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