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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island
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HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island

机译：根据阿姆斯特丹岛上的CO 、,和碳氢化合物测量值，分别从1997年和1998年在印度洋南部进行HO旋回

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A new empirical method for the derivation of average HO radical concentrations is presented. The method is based on estimation of CO lifetime through the relative variability of CO and Rn measurements, and hydrocarbon measurements are used to independently determine the relative effects of chemistry and dynamics. Data from Amsterdam Island (37 degreesS, 77 degreesE), a remote site in the southern Indian Ocean, are used to calculate annual and daily HO levels for 1997 and 1998. A seasonal variation in calculated daily HO, consistent with seasonally changing photolysis rates, with maxims in summer and minima in winter is also derived which is comparable but slightly lower than the most recent zonal mean HO estimates of Spivakovsky et al. [2000]. The calculated annual HO shows a decrease from 2.7 X 10(5) molecule cm(-3) in 1997 to 0.8 X 105 molecule cm(-3) in 1998, possibly as a result of El Nino related meteorological changes. The empirically calculated HO correlates with temperature and relative humidity measured at the island but anticorrelates strongly with CO and to a lesser extent with O-3. The limitations and improvements to this method are discussed. The method has potential for long-term monitoring of HO changes over areas upwind from remote sites. [References: 26]
机译：提出了一种新的平均HO自由基浓度推导的经验方法。该方法基于通过CO和Rn测量值的相对变异性估算CO寿命的方法，而碳氢化合物测量值可独立确定化学和动力学的相对影响。来自印度洋南部偏远地区阿姆斯特丹岛（37度，77度）的数据用于计算1997和1998年的年度和每日HO水平。计算的每日HO的季节变化与光解率的季节性变化相一致，还得出了夏季的最大值和冬季的最小值，这是可比的，但略低于Spivakovsky等人的最新区域平均HO估计值。 [2000]。计算出的年度HO值从1997年的2.7 X 10（5）分子cm（-3）降低到1998年的0.8 X 105分子cm（-3），这可能是由于厄尔尼诺现象引起的气象变化。凭经验计算的HO与在岛上测得的温度和相对湿度相关，但与CO呈反相关，在较小程度上与O-3呈反相关。讨论了此方法的局限性和改进。该方法有可能长期监测偏远地区上风区域的HO变化。 [参考：26]

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