Macroscopic stratospheric aerosol properties such as surface area density (SAD) and volume density (VD) are required by modern chemistry climate models. These quantities are in continuous need of validation by observations. Direct observation of these parameters is not possible, but they can be derived from optical particle counters (OPCs) which provide concentration (number density) and size distributions of aerosol particles, and possibly from ground‐based and satellite‐borne lidar observations of particle backscatter coefficients and aerosol type. When such measurements are obtained simultaneously by OPCs and lidars, they can be used to calculate backscatter and extinction coefficients, as well as SAD and VD. Empirical relations can thus be derived between particle backscatter coefficient, extinction coefficient, and SAD and VD for a variety of aerosols (desert dust, maritime aerosols, stratospheric aerosols) and be used to approximate SAD and VD from lidar measurements. Here we apply this scheme to coincident measurements of polar stratospheric clouds above McMurdo Station, Antarctica, by ground‐based lidar and balloon‐borne OPCs. The relationships derived from these measurements will provide a means to obtain values of SAD and VD for supercooled ternary solutions (STS) and nitric acid trihydrate (NAT) PSCs from the backscatter coefficients measured by lidar. Coincident lidar and OPC measurements provided 15 profile comparisons. Empirical expressions of SAD and VD as a function of particle backscatter coefficient, β, were calculated from fits of the form log(SAD/VD) = A + B log(β) using β from the lidar and SAD/VD from the OPC. The PSCs were classified as STS and NAT mixtures, ice being absent.

中文翻译：

---

1994年至1999年麦克默多（77.85°S，166.67°E）上的平流层极地云的重合光学粒子计数器和激光雷达测量的比较

现代化学气候模型需要宏观的平流层气溶胶特性，例如表面积密度（SAD）和体积密度（VD）。这些数量一直需要通过观察来验证。无法直接观测这些参数，但是它们可以从提供气溶胶粒子的浓度（数量密度）和尺寸分布的光学粒子计数器（OPC）中得出，也可以从对粒子反向散射的地面和人造卫星激光雷达观测中得出系数和气溶胶类型。当OPC和激光雷达同时获得此类测量值时，它们可用于计算反向散射和消光系数以及SAD和VD。因此，可以得出粒子反向散射系数，消光系数，以及用于各种气溶胶（沙漠粉尘，海洋气溶胶，平流层气溶胶）的SAD和VD，并用于从激光雷达测量中近似得出SAD和VD。在这里，我们将这种方案应用于通过地面激光雷达和气球载OPC对南极McMurdo站上方的平流层极地云层的同时测量。从这些测量值得出的关系将提供一种手段，可通过激光雷达测量的反向散射系数获得过冷三元溶液（STS）和硝酸三水合物（NAT）PSC的SAD和VD值。激光雷达和OPC的一致性测量提供了15个轮廓比较。SAD和VD随颗粒反向散射系数变化的经验表达式，在这里，我们将这种方案应用于通过地面激光雷达和气球载OPC对南极McMurdo站上方的平流层极地云层的同时测量。从这些测量值得出的关系将提供一种手段，可通过激光雷达测量的反向散射系数获得过冷三元溶液（STS）和硝酸三水合物（NAT）PSC的SAD和VD值。激光雷达和OPC的一致性测量提供了15个轮廓比较。SAD和VD随颗粒反向散射系数变化的经验表达式，在这里，我们将这种方案应用于通过地面激光雷达和气球载OPC对南极McMurdo站上方的平流层极地云层的同时测量。从这些测量值得出的关系将提供一种手段，可通过激光雷达测量的反向散射系数获得过冷三元溶液（STS）和硝酸三水合物（NAT）PSC的SAD和VD值。激光雷达和OPC的一致性测量提供了15个轮廓比较。SAD和VD随颗粒反向散射系数变化的经验表达式，从这些测量值得出的关系将提供一种手段，可通过激光雷达测量的反向散射系数获得过冷三元溶液（STS）和硝酸三水合物（NAT）PSC的SAD和VD值。激光雷达和OPC的一致性测量提供了15个轮廓比较。SAD和VD随颗粒反向散射系数变化的经验表达式，从这些测量值得出的关系将提供一种手段，可通过激光雷达测量的反向散射系数获得过冷三元溶液（STS）和硝酸三水合物（NAT）PSC的SAD和VD值。激光雷达和OPC的一致性测量提供了15个轮廓比较。SAD和VD随颗粒反向散射系数变化的经验表达式，β，从该表格日志（SAD / VD）=的拟合计算 一个 + 乙日志（β使用）β从OPC激光雷达和SAD / VD。PSC被分类为STS和NAT混合物，没有冰。