Determining the index of refraction of polar stratospheric clouds above Andoya (69°N) by combining size‐resolved concentration and optical scattering measurements
Determining the index of refraction of polar stratospheric clouds above Andoya (69°N) by combining size‐resolved concentration and optical scattering measurements
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通过结合尺寸分辨浓度和光学散射测量来确定安多亚（69°N）上方极地平流层云的折射率
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发表时间：
2000
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通讯作者：
L. Pulvirenti
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作者：
T. Deshler;B. Nardi;A. Adriani;F. Cairo;G. Hansen;F. Fierli;Alain Hauchecorne;L. Pulvirenti
比较了两个极地平流层云（PSCs）内气溶胶散射和大小分辨气溶胶浓度的观测结果，以推断PSCs颗粒的折射率。通过气球气溶胶计数器和激光散射计（692、830 nm）和臭氧激光雷达（308、353 nm）和瑞利激光雷达（532、1064 nm）在现场完成观测。蒙特卡罗分析表明，在折射率为1.30-1.60的范围内，对比方法的精度为±0.03。所有仪器的测量结果在一个PSC中获得，相对较少的垂直或水平结构。结果表明，PSC粒子在云的非去极化区折射率为1.47±0.01，在去极化区折射率为1.52 ~ 1.56±0.04。这些值与308、353、692和830 nm的观测值一致。与瑞利激光雷达的比较并不一致。从粒子测量推断出的气溶胶体积与云底部液体三元气溶胶（LTA）的预期体积非常吻合，在去极化区域，三水合硝酸（NAT）在23公里以上，在云的大部分非去极化部分，LTA和NAT都存在。在第二个具有强垂直结构的PSC中获得了一组更有限的测量值，这在温度和气溶胶剖面中很明显。由于在具有强垂直和水平结构的云中比较原位和远程测量存在固有问题，因此在该云中进行比较是困难的。在这个PSC中，原位气溶胶大小分布和远程气溶胶散射的比较没有收敛到一个明确的折射率。
Observations within two polar stratospheric clouds (PSCs) of aerosol scattering and size-resolved aerosol concentration were compared to infer the index of refraction of the PSC particles. The observations were completed in situ with balloon-borne aerosol counters and a laser scatterometer (692, 830 nm) and remotely with an ozone (308, 353 nm) and Rayleigh (532, 1064 nm) lidar. A Monte Carlo analysis, accounting for the errors of the individual measurements, indicates the comparison method has a precision of ±0.03 for an index of refraction range of 1.30–1.60. Measurements from all instruments were obtained in one PSC with relatively little vertical or horizontal structure. The comparison suggested that the index of refraction of the PSC particles was near 1.47±0.01 in the nondepolarizing region of the cloud and 1.52–1.56±0.04 in the depolarizing region. These values were consistent for the observations at 308, 353, 692, and 830 nm. The comparisons with the Rayleigh lidar were not as consistent. Aerosol volumes inferred from the particle measurements agree closely with volumes expected for liquid ternary aerosol (LTA) at the base of the cloud, with nitric acid trihydrate (NAT) above 23 km, in the depolarizing region, and with both LTA and NAT in the bulk of the nondepolarizing portion of the cloud. A much more limited set of measurements was obtained in a second PSC with strong vertical structure, evident in the temperature and aerosol profiles. Comparisons in this cloud were difficult because of the inherent problems in comparing in situ and remote measurements in clouds with strong vertical and horizontal structure. In this PSC the comparisons of in situ aerosol size distribution and remote aerosol scattering did not converge to a clear index of refraction.