We present the first year of ClO and O₃ measurements from a new 278 GHz Chlorine monOxide Experiment (ChlOE) microwave instrument on Mauna Kea. We make use of comparisons with the Aura Microwave Limb Sounder (MLS) O₃ measurements to recalibrate the ground‐based instrument and find that the recalibrated ground‐based O₃ retrievals remain stable relative to MLS throughout the year. The MLS measurements provide daily daytime (~1330 local solar time) and nighttime (~0200 local solar time) ClO retrievals, and we find that the monthly ChlOE ClO retrievals show mixing ratios slightly smaller than those from MLS in the vicinity of Mauna Kea, with daytime values near the peak ~6–8% lower at 30–45 km for the average of the 12 months in this study. The nighttime monthly ClO values are almost all within ±0.03 ppbv over most of this altitude range, with very little overall bias. We have also made detailed hourly diurnal O₃ comparisons with a multiyear analysis of previous retrievals from the much stronger 110 GHz O₃ emission line being measured by our instrument at Mauna Loa and find that the hour‐to‐hour differences are within ±2% at 40 km, which indicates that the overall calibration of the ChlOE instrument is stable relative to time of day. We show hourly diurnal variations of ClO and compare these to 2010 measurements from the Submillimeter‐Wave Limb‐Emission Sounder and to a model.

中文翻译：

---

在莫纳克亚山用新型微波平流层ClO仪器测量的初步结果和日变化

我们介绍了在莫纳克亚山（Mauna Kea）上使用新型278 GHz氯一氧化碳实验（ChlOE）微波仪器进行ClO和O ₃测量的第一年。我们通过与Aura微波四肢测深仪（MLS）O _3的测量结果进行比较来重新校准地面仪器，并发现重新校准的地面O ₃相对于MLS，全年检索保持稳定。MLS的测量结果提供了白天（〜1330当地日光时间）和夜晚（〜0200当地日光时间）的ClO检索，我们发现，每月的ChlOE ClO检索显示的混合比比Mauna Kea附近的MLS的混合比略小，在这项研究中，平均12个月的平均日值在30-45公里处降低了约6–8％的峰值。在这个高度范围的大部分时间里，夜间每月ClO值几乎都在±0.03 ppbv以内，总体偏差很小。我们还对每小时的O ₃进行了详细的每小时比较，并从更强大的110 GHz O _3上对以前的数据进行了多年分析。我们的仪器在莫纳罗亚火山（Mauna Loa）处测量的排放线发现，在40 km处，时差在±2％以内，这表明ChlOE仪器的整体校准相对于一天中的时间是稳定的。我们显示了ClO的每小时昼夜变化，并将其与2010年亚毫米波肢体发射声纳的测量值和一个模型进行了比较。