Ground-based comparison of NO2, H2O, and O-3 measured by long-path and in situ techniques during the 1993 tropospheric OH photochemistry experiment
Ground-based comparison of NO2, H2O, and O-3 measured by long-path and in situ techniques during the 1993 tropospheric OH photochemistry experiment
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DOI：
10.1029/96jd01729
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发表时间：
1997-03-20
影响因子：
4.4
通讯作者：
Fehsenfeld, FC
中科院分区：
文献类型：
--
作者：
Harder, JW;Williams, EJ;Fehsenfeld, FC
1993年对流层OH光化学实验（1993年8月8日至10月4日）的主要目标之一是通过原位技术和长光程差分吸收光谱法比较大气中重要的痕量气体NO2、O-3和H2O的测量。这些化合物进行了测量超过20.6公里的折叠光学路径从弗里茨峰天文台驯鹿矿的后向反射器阵列的位置。在爱达荷州山进行了现场测量，该山位于Caribou矿西北0.7公里处和科罗拉多博尔德以西25公里处。NO2是在爱达荷州希尔通过光解和NO化学发光测定的。使用校准的商业仪器在该地点测量O-3和H2O。使用分数差异（[长路径-爱达荷州希尔]/爱达荷州希尔）作为一致性的度量，臭氧和水的总体一致性分别为+3+/-7%和-4+/-17%。对于NO2的比较是复杂的强源和大的环境变化的影响，在测量过程中。在清洁西风气流期间，观察到的分数差异为+30+/-110%。进一步分析数据以评估这些偏差表明，对于大于300 pptv的混合比（远高于30-45 pptv的lo检测限），两种方法的差异不超过10%，该值在测量技术的组合不确定度范围内。
One of the major objectives of the 1993 Tropospheric OH Photochemistry Experiment (August 8 to October 4, 1993) was to compare atmospheric measurements of the important trace gas species NO2, O-3, and H2O by in situ techniques and by long-path differential absorption spectroscopy. These compounds were measured over a 20.6 km folded optical path from Fritz Peak Observatory to Caribou Mine where a retroreflector array is located. In situ measurements were made at Idaho Hill, 0.7 km northwest of Caribou Mine and 25 km west of Boulder, Colorado. NO2 was determined at Idaho Hill by photolysis followed by NO chemiluminescence. O-3 and H2O were measured at this site using calibrated commercial instruments. Using fractional differences ([long path - Idaho Hill]/Idaho Hill) as a measure of agreement, overall agreement for ozone and water are +3+/-7% and -4+/-17%, respectively. For NO2 the comparison is complicated by the influence of strong sources and large ambient variability during the measurements. During times of clean westerly flow, fractional differences of +30+/-110% were observed. Further analysis of the data to evaluate these biases show that for mixing ratios greater than 300 pptv (well above the lo detection limit of 30-45 pptv) the two methods differ by no more than 10%, a value well within the combined uncertainties of the measurement techniques.