HR: 1340h
AN: A33B-1197    [Abstracts]
TI: OH reactivity measurement at Tomakomai Experimental Forest, Japan in late summer
AU: * Kajii, Y J
EM: kajii@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Tajima, Y
EM: tajima@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Okazaki, H
EM: okazaki@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Miyazaki, K
EM: miyazaki@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Matsuda, H
EM: matsuda@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Nishida, S
EM: nishida@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Kato, S
EM: shungo@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Hiura, T
EM: hiuraE#8212;exfor.agr.hokudai.ac.jp
AF: Tomakomai Experimental Forest, Field Science Center for Northern Biosphere, Hokkaido University, Takaoka, Tomakomai, Hokkaido, 053-0035, Japan
AU: Ishii, K
EM: ishii-k@tokyokankyo.jp
AF: Atmospheric Research Division, Tokyo Metropolitan Research Institute for Environmental Protection, 1-7-5, Shinsuna, Koutou, Tokyo, 136-0075, Japan
AU: Matsunaga, S
EM: sou@atmchem.apchem.metro-u.ac.jp
AF: Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo, 192-0397, Japan
AU: Matsunaga, S
EM: sou@atmchem.apchem.metro-u.ac.jp
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301, United States
AU: Greenberg, J
EM: greenber@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301, United States
AU: Guenther, A
EM: guenther@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301, United States
AB: OH reactivity in the atmosphere provides useful information as an index for evaluation of air quality. There exist at least a couple of hundreds of VOCs in the atmosphere which react with OH radicals to contribute for oxidant formation. OH reactivity can be measured by laser pump and probe technique developed by our laboratory. We found considerable amount of missing sink of OH in semi-urban atmosphere in Tokyo priory to Tomakomai expedition. The contribution of missing sink is predominant in spring and summer time. Possible missing sinks could be either biogenic VOC or secondary organic compounds which we did not measure. To make it clear we carried out OH reactivity measurement at Tomakomai Experimental Forest whether unknown OH sinks exist or not. We measured around 80 chemical species by GC-MS, FIF, and PTR-MS techniques in addition to careful observation of NOx by laser induced fluorescence. We successfully measured OH reactivity in early September 2006 for two days showing isoprene like missing sink. To account for the missing sink we need double amount of isoprene. Either secondary oxidation products from isoprene or other biogenic VOCs which has similar emission character such as isoprene.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting