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"NASA Technical Reports Server (NTRS) 19910001210: ER-2 Lidar Measurements Of Stratocumulus Cloud Top Structure On July 14, 1987" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19910001210: ER-2 Lidar Measurements Of Stratocumulus Cloud Top Structure On July 14, 1987” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19910001210: ER-2 Lidar Measurements Of Stratocumulus Cloud Top Structure On July 14, 1987
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19910001210

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"NASA Technical Reports Server (NTRS) 19910001210: ER-2 Lidar Measurements Of Stratocumulus Cloud Top Structure On July 14, 1987" Description:

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On July 14, 1987 NASA's ER-2 high altitude aircraft flew a mission to measure the structure of stratocumulus clouds off the coast of California. A flight pattern was executed so that the two-dimensional variability of the clouds could be detected. The technique of analysis of the lidar data to measure cloud tops follows. First each signal is searched for its maximum in return strength. This maximum is caused by scattering of the laser light off cloud particles or from the ocean surface. Next the variance of the signal return above the level of maximum backscatter is determined. Cloud top is assigned to a level (above the level of maximum backscatter) where the backscatter exceeds the average variance. This two-step process is necessary because the level of maximum backscatter does not correspond to the cloud top. Ocean surface returns are easily separated from cloud returns in this process, described in detail by Boers, Spinhirne, and Hart (1988). Analysis of the data so far has shown that there were very few breaks in the clouds. Furthermore the layer top was very flat with local oscillations not exceeding 30 m. Such small cloud top variations are still well within the range of detectability, because the precision of this technique of cloud top detection has previously been established to be 13 to 15 m. Data are presently being analyzed to compute cloud top distributions and fractional cloudiness. The aim of this research is to relate the fractional cloudiness to the mean thermodynamic structure of the boundary layer. Researchers plan to compute spectral scales of the cloud top variability in two dimensions to determine the orientation of the clouds with respect to the mean wind. Furthermore the lidar derived cloud top distribution will be used in the computation of the thermodynamic and radiation budget of the boundary layer.

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