Nighttime observation of the HO2 radical by an LIF instrument at Oki island, Japan, and its possible origins

Y. Kanaya; Y. Sadanaga; J. Matsumoto; U. K. Sharma; J. Hirokawa; Y. Kajii; H. Akimoto

doi:10.1029/1999GL900475

Nighttime observation of the HO₂ radical by an LIF instrument at Oki island, Japan, and its possible origins

Y. Kanaya^*, Y. Sadanaga, J. Matsumoto, U. K. Sharma, J. Hirokawa, Y. Kajii, H. Akimoto

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

HO₂ (hydroperoxy) radical of unexpectedly high concentration around 3 ppt was measured by an instrument based on laser-induced fluorescence with NO addition at Oki island, Japan, on the night of August 9/10, 1998. We confirmed that the interference by atmospheric organic peroxy (RO₂) radicals was insignificant and concluded that the measured signal originated from nighttime HO₂. Model calculations constrained to ancillary measurements indicated that HO₂ and RO₂ were produced primarily via the reactions of ozone with olefins, especially those with internal olefins, and that NO₃ chemistry was relatively unimportant. HO₂ concentration was kept high by nighttime NO (∼10 ppt) via RO₂ + NO reactions. Low NO₂ (∼150 ppt) slowed NO₃ production rate. Thus, the high observed HO₂ suggests that the reactions of O₃ with olefins are important HOx primary production mechanisms in the relatively clean atmosphere.

Original language	English
Pages (from-to)	2179-2182
Number of pages	4
Journal	Geophysical Research Letters
Volume	26
Issue number	14
DOIs	https://doi.org/10.1029/1999GL900475
Publication status	Published - 1999 Jul 15
Externally published	Yes

ASJC Scopus subject areas

Geophysics
Earth and Planetary Sciences(all)

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title = "Nighttime observation of the HO2 radical by an LIF instrument at Oki island, Japan, and its possible origins",

abstract = "HO2 (hydroperoxy) radical of unexpectedly high concentration around 3 ppt was measured by an instrument based on laser-induced fluorescence with NO addition at Oki island, Japan, on the night of August 9/10, 1998. We confirmed that the interference by atmospheric organic peroxy (RO2) radicals was insignificant and concluded that the measured signal originated from nighttime HO2. Model calculations constrained to ancillary measurements indicated that HO2 and RO2 were produced primarily via the reactions of ozone with olefins, especially those with internal olefins, and that NO3 chemistry was relatively unimportant. HO2 concentration was kept high by nighttime NO (∼10 ppt) via RO2 + NO reactions. Low NO2 (∼150 ppt) slowed NO3 production rate. Thus, the high observed HO2 suggests that the reactions of O3 with olefins are important HOx primary production mechanisms in the relatively clean atmosphere.",

author = "Y. Kanaya and Y. Sadanaga and J. Matsumoto and Sharma, {U. K.} and J. Hirokawa and Y. Kajii and H. Akimoto",

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T1 - Nighttime observation of the HO2 radical by an LIF instrument at Oki island, Japan, and its possible origins

AU - Kanaya, Y.

AU - Sadanaga, Y.

AU - Matsumoto, J.

AU - Sharma, U. K.

AU - Hirokawa, J.

AU - Kajii, Y.

AU - Akimoto, H.

PY - 1999/7/15

Y1 - 1999/7/15

N2 - HO2 (hydroperoxy) radical of unexpectedly high concentration around 3 ppt was measured by an instrument based on laser-induced fluorescence with NO addition at Oki island, Japan, on the night of August 9/10, 1998. We confirmed that the interference by atmospheric organic peroxy (RO2) radicals was insignificant and concluded that the measured signal originated from nighttime HO2. Model calculations constrained to ancillary measurements indicated that HO2 and RO2 were produced primarily via the reactions of ozone with olefins, especially those with internal olefins, and that NO3 chemistry was relatively unimportant. HO2 concentration was kept high by nighttime NO (∼10 ppt) via RO2 + NO reactions. Low NO2 (∼150 ppt) slowed NO3 production rate. Thus, the high observed HO2 suggests that the reactions of O3 with olefins are important HOx primary production mechanisms in the relatively clean atmosphere.

AB - HO2 (hydroperoxy) radical of unexpectedly high concentration around 3 ppt was measured by an instrument based on laser-induced fluorescence with NO addition at Oki island, Japan, on the night of August 9/10, 1998. We confirmed that the interference by atmospheric organic peroxy (RO2) radicals was insignificant and concluded that the measured signal originated from nighttime HO2. Model calculations constrained to ancillary measurements indicated that HO2 and RO2 were produced primarily via the reactions of ozone with olefins, especially those with internal olefins, and that NO3 chemistry was relatively unimportant. HO2 concentration was kept high by nighttime NO (∼10 ppt) via RO2 + NO reactions. Low NO2 (∼150 ppt) slowed NO3 production rate. Thus, the high observed HO2 suggests that the reactions of O3 with olefins are important HOx primary production mechanisms in the relatively clean atmosphere.

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Nighttime observation of the HO₂ radical by an LIF instrument at Oki island, Japan, and its possible origins

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