Marcy T P, Fahey D W, Gao R S, Popp P J, Richard E C, Thompson T L, Rosenlof K H, Ray E A, Salawitch R J, Atherton C S, Bergmann D J, Ridley B A, Weinheimer A J, Loewenstein M, Weinstock E M, Mahoney M J
Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, USA.
Science. 2004 Apr 9;304(5668):261-5. doi: 10.1126/science.1093418.
We have developed a chemical ionization mass spectrometry technique for precise in situ measurements of hydrochloric acid (HCl) from a high-altitude aircraft. In measurements at subtropical latitudes, minimum HCl values found in the upper troposphere (UT) were often near or below the detection limit of the measurements (0.005 parts per billion by volume), indicating that background HCl values are much lower than a global mean estimate. However, significant abundances of HCl were observed in many UT air parcels, as a result of stratosphere-to-troposphere transport events. We developed a method for diagnosing the amount of stratospheric ozone in these UT parcels using the compact linear correlation of HCl with ozone found throughout the lower stratosphere (LS). Expanded use of this method will lead to improved quantification of cross-tropopause transport events and validation of global chemical transport models.
我们开发了一种化学电离质谱技术，用于从高空飞机上对盐酸（HCl）进行精确的原位测量。在亚热带纬度的测量中，对流层上部（UT）发现的最低HCl值通常接近或低于测量的检测限（体积比为十亿分之0.005），这表明背景HCl值远低于全球平均估计值。然而，由于平流层到对流层的传输事件，在许多UT气团中观察到了大量的HCl。我们开发了一种方法，利用在整个平流层下部（LS）发现的HCl与臭氧的紧密线性相关性来诊断这些UT气团中的平流层臭氧量。这种方法的广泛应用将有助于改进对跨对流层顶传输事件的量化，并验证全球化学传输模型。
