Behavior of OH and HO2 radicals during the Observations at a Remote Island of Okinawa (ORION99) field campaign: 1. Observation using a laser‐induced fluorescence instrument
Behavior of OH and HO2 radicals during the Observations at a Remote Island of Okinawa (ORION99) field campaign: 1. Observation using a laser‐induced fluorescence instrument
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冲绳偏远岛屿观测（ORION99）野外活动期间 OH 和 HO2 自由基的行为： 1. 使用激光诱导荧光仪器进行观测
DOI：
10.1029/2000jd000178
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发表时间：
2001
影响因子：
--
通讯作者：
H. Akimoto
中科院分区：
文献类型：
--
作者：
Y. Kanaya;Y. Sadanaga;K. Nakamura;H. Akimoto
在1999年夏天的ORION 99野外观测活动中，在日本冲绳海多角用激光诱导荧光仪测量了大气中的羟基（OH）和过氧化氢（HO 2）自由基。详细介绍了该仪器的现场部署及其标定。从现场活动期间的频繁校准，它表明，该仪器，利用光纤将激光传输到位于塔上的检测单元，具有足够稳定的灵敏度OH和HO 2，以跟踪其昼夜和日常的变化。仪器的检测限通常约为4 × 106个自由基cm−3，积分时间为1分钟。然而，在白天的每小时平均OH浓度有统计学意义。HO 2浓度较高，并检测到详细的变化。平均而言，OH和HO 2在白天的最大值分别约为4 × 106个自由基cm−3和17 pptv。日间测定的HO 2/OH浓度比的中位数、第10位和第90位分别为76、32和143。当NO浓度低于300 pptv时，HO 2对J（O 1D）的幂律依赖性约为0.5，当NO浓度高于1 ppbv时，HO 2对J（O 1D）的幂律依赖性约为1，这与对流层低层中已知的自由基化学相一致。
The hydroxyl (OH) and hydroperoxyl (HO2) radicals were measured by a laser-induced fluorescence instrument at Cape Hedo, Okinawa Island, Japan, in summer 1999 during the Observations at a Remote Island of Okinawa (ORION99) field campaign. The field deployment of the instrument and its calibrations are described in detail. From the frequent calibrations during the field campaign, it was shown that the instrument, utilizing an optical fiber to transmit the laser light to the detection cell located on a tower, had a sufficiently stable sensitivity to OH and HO2 in order to trace their diurnal and day-to-day variations. The detection limit of the instrument was typically around 4 × 106 radicals cm−3 with an integration time of 1 min. We could not examine fast OH variations. However, hourly averaged OH concentrations during daytime were statistically significant. The HO2 concentrations were higher and the detailed variations were detected. On average, OH and HO2 showed daytime maxima of around 4 × 106 radicals cm−3 and of around 17 pptv, respectively. The median, tenth, and ninetieth percentiles of the measured daytime HO2/OH concentration ratio were 76, 32, and 143, respectively. The power law dependence of HO2 on J(O1D) was about 0.5 when the NO concentration was lower than 300 pptv and was about 1 when the NO concentration was higher than 1 ppbv, which was consistent with the known radical chemistry in the lower troposphere.