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Software Development in the Framework of the Aerosol-Cloud-Ecosystems Mission (ACE) in Cooperation With NASA 兰利研究中心 (LaRC)

兰利研究中心 developed the world's first airborne 3 backscatter + 2 extinction multiwavelength High Spectral Resolution Lidar (HSRL-2). The system has been participating in several field missions since mid 2012 when the instrument became operational. Our team develops 数据反转算法 for the analysis of data acquired with this system. Some additional information on this project and the instrument can be found in Muller等。 [2014].

Briefly, HSRL-2 operates at laser wavelengths of 355, 532, and 1064 nm. HSRL-2 measures profiles of particle backscatter coefficients and linear particle depolarization ratios at 355, 532, and 1064 nm, and particle volume extinction coefficients at 355 and 532 nm. The extinction and backscatter coefficients at 355 and 532 nm are derived using the HSRL technique [Grund and Eloranta, 1991]. The backscatter coefficient at 1064 nm is measured using the standard backscatter technique [Fernald, 1984], but with the benefit of transfer of calibration using the 532 nm HSRL retrievals in clear-air regions of the profile [Hair et al., 2008].

Our software development aims at carrying out unsupervised, automated retrievals of microphysical parameters of particulate air pollution (mean particle size, number, surface-area, and volume concentration, real and imaginary part of the complex refractive index) with inversion algorithms that use the optical data from HSRL-2 as input information. On the basis of the information on the derived microphysical properties we can compute single-scattering albedo (= scattering-to-extinction ratio) and light-absorption coefficients. Light-absorption by aerosol particles poses one of the biggest challenges in accurately assessing climate change by man-made pollution. ACE addresses the investigation of particle light-absorption as one of the key goals. The airborne lidar serves as simulator for a potential space-borne instrument that would be launched as part of the 王牌任务.

下图显示的数据分析的例子与我们的软件进行。细节可以发现 Muller等。 [2014] 500 Internal Server Error

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Measurements Tcap

The figure above shows curtain plots of a 5-min flight segment that was used for the data inversion. (Bottom) Microphysical parameters retrieved from the inversion method (red) and from the G-1 aircraft aboard which the in situ measurements were made (black) on 17 July 2012. The measurement time was 16:00–16:05 UTC for the inversion results and 15:45–15:56 UTC for the in situ data. The lidar measurements were obtained 2 km away from the approximate center of the spiral that was flown by the G-1 aircraft during the time of the lidar measurements. The inversion results represent height intervals of 150 m. The in situ data were taken with considerably higher spatial resolution. Error bars of the individual in situ data points are composed of two types, counting and sizing. The error bars denote 1 standard deviation.

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