Nighttime variations in HO2 radical mixing ratios at Rishiri Island observed with elevated monoterpene mixing ratios

Yugo Kanaya, Kenji Nakamura, Shungo Kato, Jun Matsumoto, Hiroshi Tanimoto, Hajime Akimoto

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

HO2 radical concentrations were measured by a laser-induced fluorescence instrument for three nighttime periods during the intensive field campaign at Rishiri Island, Japan, in June 2000. The HO2 mixing ratio had temporal variations around its average of 4.2±1.2 (1σ) pptv and showed a positive correlation with the summed mixing ratio of four monoterpene species, α-pinene, β-pinene, camphene, and limonene, that sometimes reached 1ppbv. Our model calculations suggested that ozonolysis reactions of monoterpenes were the main source of nighttime radicals and they explained 58% of measured HO2 concentration levels. The model roughly reproduced the dependence of the HO2 mixing ratio on the square root of the radical production rate due to the ozonolysis reactions of the monoterpenes. However, the absolute HO2 mixing ratio was significantly underpredicted by the model. We discuss possible reasons in terms of misunderstood RO2 chemistry, RO2 interference with HO2 observations, unknown radical production process associated by high NO2 mixing ratio, and the contribution of unmeasured olefinic species to radical production via their reactions with ozone.

Original languageEnglish
Pages (from-to)4929-4940
Number of pages12
JournalAtmospheric Environment
Volume36
Issue number31
DOIs
Publication statusPublished - 2002 Oct
Externally publishedYes

Fingerprint

Monoterpenes
monoterpene
mixing ratio
Camphene
laser induced fluorescence
Ozone
temporal variation
Fluorescence
ozone
Lasers

Keywords

  • Boundary layer
  • HO radical
  • Monoterpene
  • Nighttime chemistry
  • Ozonolysis reaction

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Pollution

Cite this

Nighttime variations in HO2 radical mixing ratios at Rishiri Island observed with elevated monoterpene mixing ratios. / Kanaya, Yugo; Nakamura, Kenji; Kato, Shungo; Matsumoto, Jun; Tanimoto, Hiroshi; Akimoto, Hajime.

In: Atmospheric Environment, Vol. 36, No. 31, 10.2002, p. 4929-4940.

Research output: Contribution to journalArticle

Kanaya, Yugo ; Nakamura, Kenji ; Kato, Shungo ; Matsumoto, Jun ; Tanimoto, Hiroshi ; Akimoto, Hajime. / Nighttime variations in HO2 radical mixing ratios at Rishiri Island observed with elevated monoterpene mixing ratios. In: Atmospheric Environment. 2002 ; Vol. 36, No. 31. pp. 4929-4940.
@article{e4f40973aa97438da47d454969b709fe,
title = "Nighttime variations in HO2 radical mixing ratios at Rishiri Island observed with elevated monoterpene mixing ratios",
abstract = "HO2 radical concentrations were measured by a laser-induced fluorescence instrument for three nighttime periods during the intensive field campaign at Rishiri Island, Japan, in June 2000. The HO2 mixing ratio had temporal variations around its average of 4.2±1.2 (1σ) pptv and showed a positive correlation with the summed mixing ratio of four monoterpene species, α-pinene, β-pinene, camphene, and limonene, that sometimes reached 1ppbv. Our model calculations suggested that ozonolysis reactions of monoterpenes were the main source of nighttime radicals and they explained 58{\%} of measured HO2 concentration levels. The model roughly reproduced the dependence of the HO2 mixing ratio on the square root of the radical production rate due to the ozonolysis reactions of the monoterpenes. However, the absolute HO2 mixing ratio was significantly underpredicted by the model. We discuss possible reasons in terms of misunderstood RO2 chemistry, RO2 interference with HO2 observations, unknown radical production process associated by high NO2 mixing ratio, and the contribution of unmeasured olefinic species to radical production via their reactions with ozone.",
keywords = "Boundary layer, HO radical, Monoterpene, Nighttime chemistry, Ozonolysis reaction",
author = "Yugo Kanaya and Kenji Nakamura and Shungo Kato and Jun Matsumoto and Hiroshi Tanimoto and Hajime Akimoto",
year = "2002",
month = "10",
doi = "10.1016/S1352-2310(02)00401-6",
language = "English",
volume = "36",
pages = "4929--4940",
journal = "Atmospheric Environment",
issn = "1352-2310",
publisher = "Elsevier Limited",
number = "31",

}

TY - JOUR

T1 - Nighttime variations in HO2 radical mixing ratios at Rishiri Island observed with elevated monoterpene mixing ratios

AU - Kanaya, Yugo

AU - Nakamura, Kenji

AU - Kato, Shungo

AU - Matsumoto, Jun

AU - Tanimoto, Hiroshi

AU - Akimoto, Hajime

PY - 2002/10

Y1 - 2002/10

N2 - HO2 radical concentrations were measured by a laser-induced fluorescence instrument for three nighttime periods during the intensive field campaign at Rishiri Island, Japan, in June 2000. The HO2 mixing ratio had temporal variations around its average of 4.2±1.2 (1σ) pptv and showed a positive correlation with the summed mixing ratio of four monoterpene species, α-pinene, β-pinene, camphene, and limonene, that sometimes reached 1ppbv. Our model calculations suggested that ozonolysis reactions of monoterpenes were the main source of nighttime radicals and they explained 58% of measured HO2 concentration levels. The model roughly reproduced the dependence of the HO2 mixing ratio on the square root of the radical production rate due to the ozonolysis reactions of the monoterpenes. However, the absolute HO2 mixing ratio was significantly underpredicted by the model. We discuss possible reasons in terms of misunderstood RO2 chemistry, RO2 interference with HO2 observations, unknown radical production process associated by high NO2 mixing ratio, and the contribution of unmeasured olefinic species to radical production via their reactions with ozone.

AB - HO2 radical concentrations were measured by a laser-induced fluorescence instrument for three nighttime periods during the intensive field campaign at Rishiri Island, Japan, in June 2000. The HO2 mixing ratio had temporal variations around its average of 4.2±1.2 (1σ) pptv and showed a positive correlation with the summed mixing ratio of four monoterpene species, α-pinene, β-pinene, camphene, and limonene, that sometimes reached 1ppbv. Our model calculations suggested that ozonolysis reactions of monoterpenes were the main source of nighttime radicals and they explained 58% of measured HO2 concentration levels. The model roughly reproduced the dependence of the HO2 mixing ratio on the square root of the radical production rate due to the ozonolysis reactions of the monoterpenes. However, the absolute HO2 mixing ratio was significantly underpredicted by the model. We discuss possible reasons in terms of misunderstood RO2 chemistry, RO2 interference with HO2 observations, unknown radical production process associated by high NO2 mixing ratio, and the contribution of unmeasured olefinic species to radical production via their reactions with ozone.

KW - Boundary layer

KW - HO radical

KW - Monoterpene

KW - Nighttime chemistry

KW - Ozonolysis reaction

UR - http://www.scopus.com/inward/record.url?scp=0036804568&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036804568&partnerID=8YFLogxK

U2 - 10.1016/S1352-2310(02)00401-6

DO - 10.1016/S1352-2310(02)00401-6

M3 - Article

AN - SCOPUS:0036804568

VL - 36

SP - 4929

EP - 4940

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

IS - 31

ER -