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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >SEASONAL VARIATION OF THE OZONE PRODUCTION EFFICIENCY PER UNIT NOX AT HARVARD FOREST, MASSACHUSETTS
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SEASONAL VARIATION OF THE OZONE PRODUCTION EFFICIENCY PER UNIT NOX AT HARVARD FOREST, MASSACHUSETTS

机译：麻萨诸塞州哈佛森林每单位氮氧化物的臭氧生产效率的季节变化

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Weekly values of the net O-3 production efficiency (OPE), defined as the net number of O-3 molecules produced per molecule of NOx (NO + NO2) consumed, are estimated from a 1990-1994 record of O-3, NOx, NOy, CO, and C2H2 concentrations at Harvard Forest, Massachusetts. The OPE is inferred from the slope Delta O-3/Delta(NOy-NOx) of the linear regression between O-3 and NOy-NOx concentrations (NOy is the sum of NOx and its oxidation products); and alternatively from the slopes Delta O-3/Delta CO and Delta O-3/C2H2 multiplied by regional estimates of the CO/NOx and C2H2/NOx emission ratios. The mean OPE values inferred from Delta O-3/(NOy-NOx) are 3-5 times higher than those inferred from Delta O-3/Delta CO or Delta O-3/Delta C2H2; the discrepancy may be due to the effects of HNO3 and O-3 deposition and also to uncertainties in the CO/NOx and C2H2/NOx emission ratios. The relative seasonal trends of the OPE derived from Delta O-3/(NOy-NOx), Delta O-3/Delta CO, and Delta O-3/C2H2 are, however, similar. Thus Delta O-3/(NOy-NOx) increases from about 4 mol/mol in May to 8 mol/mol in June-July, and gradually decreases back to 4 mol/mol by early October. The sharp rise of the OPE from May to June is attributed to onset of emission of the biogenic hydrocarbon isoprene. The decline from July to October is attributed to decreases in isoprene emission and in solar radiation. The O-3 background at Harvard Forest, defined by the y intercept of the O-3 versus NOy-NOx regression line, decreases from 40 ppbv in May to 25 ppbv in September, consistent with observations at remote sites in northern midlatitudes. The seasonal trend in the background explains why mean O-3 concentrations at Harvard Forest peak in May-June even though the OPE peaks in June-July. [References: 40]
机译：从1990年至1994年O-3，NOx记录估算的O-3净生产效率（OPE）的每周值，定义为每消耗一分子NOx（NO + NO2）产生的O-3分子的净数量。 ，马萨诸塞州哈佛森林中的NOy，CO和C2H2浓度。从O-3和NOy-NOx浓度（NOy是NOx及其氧化产物的总和）之间的线性回归的斜率Delta O-3 / Delta（NOy-NOx）可以得出OPE。以及从Delta O-3 / Delta CO和Delta O-3 / C2H2的斜率乘以CO / NOx和C2H2 / NOx排放比的区域估计值的乘积。从Delta O-3 /（NOy-NOx）推断出的平均OPE值是从Delta O-3 / Delta CO或Delta O-3 / Delta C2H2推断的3-5倍;差异可能是由于HNO3和O-3沉积的影响，也归因于CO / NOx和C2H2 / NOx排放比的不确定性。但是，由Delta O-3 /（NOy-NOx），Delta O-3 / Delta CO和Delta O-3 / C2H2得出的OPE的相对季节趋势相似。因此，Delta O-3 /（NOy-NOx）从5月的约4 mol / mol增加到6月至7月的8 mol / mol，并在10月初逐渐降低回4 mol / mol。 5月至6月OPE的急剧增加归因于生物烃异戊二烯的排放开始。 7月至10月的下降归因于异戊二烯排放量和太阳辐射的减少。哈佛森林的O-3背景由O-3对NOy-NOx回归线的y截距定义，从5月的40 ppbv下降至9月的25 ppbv，与中纬度北部偏远地区的观测结果一致。背景的季节趋势解释了为什么OPE森林在6月至7月达到峰值时，平均5月至6月哈佛森林中O-3浓度达到峰值的原因。 [参考：40]

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