Parkes, Stephen Wang, Lixin McCabe, Matthew On the cross-sensitivity between water vapor mixing ratio and stable isotope measurements of in-situ analyzers Pertinent analysis examples are presented to illustrate each calculation. Here we use those results to derive the temperature dependent forms of the equations for the aerosol scattering ratio, aerosol backscatter coefficient, extinction to backscatter ratio and water vapor mixing ratio. New forms of the lidar equation were developed to account for this temperature sensitivity. In a companion paper, the temperature dependence of Raman scattering and its influence on the Raman water vapor signal and the lidar equations was examined. New Examination of the Traditional Raman Lidar Technique II: Temperature Dependence Aerosol Scattering Ratio and Water Vapor Mixing Ratio Equations In addition, this study also found, the pattern of water vapor content and PWV have more influenced by the relative humidity. This indicates that the water vapor content that obtained with mixing ratio agreed very well with the ANFIS PWV model. The result showed that the water vapor content has a similar trend with the PWV which produced by ANFIS PWV model (r = 0.975 at the 99% confidence level).
The accuracy of water vapor content was validated with PWV from ANFIS PWV model for the period of 20-23 December 2016. The water vapor content value was estimated with mixing ratio method and the surface meteorological data as the parameter inputs. This study reported the comparison between water vapor content, the surface meteorological data (pressure, temperature, and relative humidity), and precipitable water vapor (PWV) produced by PWV from adaptive neuro fuzzy inference system (ANFIS) for areas in the Universiti Kebangsaan Malaysia Bangi (UKMB) station. In other cases, there is a dependenceĮstimation water vapor content using the mixing ratio method and validated with the ANFIS PWV model For examples under some circumstances there is little temperature dependence in 2f/DC so temperature can be neglected. The database will also be used to select a retrieval technique. The results have been incorporated into a database which will be used to select the best line for a particular mission. 2f/DC values were calculated for pressures, temperatures, and water vapor mixing ratios expected to be encountered in future missions.
#PANFU 18.3 CODE#
Once the validity of the computer code was established, it was used to investigate possible candidate absorption lines. As a result, the laser modulation amplitude can now be set in the field by comparing the response of the instrument to the calculated response as a function of modulation amplitude. The experimental and theoretical values agreed to within a few percent. This code was used to generate 2f/DC values for the conditions measured in the laboratory. During my 1994 faculty fellowship, a computer program was created which allowed 2f/DC to be calculated for any combination of the variables which effect it.
#PANFU 18.3 SERIES#
Measurements of 2f/DC were made for a series of pressures and modulation amplitudes. A 3 m cell was fabricated in order to perform laboratory tests of the sensor. The present work concerns efforts to quantify the contributions of these factors and to derive a method for extracting the water vapor mixing ratio from the measurements. The 2f/DC ratio depends on the amount of wavelength modulation, the water vapor absorption line being observed, and the temperature, pressure, and water vapor content of the atmosphere. The 2f and DC signals are measured by a detector mounted adjacent to the laser. An infrared tunable diode laser is wavelength modulated across a water vapor absorption line at a frequency f. Langley Research Center has developed a novel external path sensor which monitors water vapor along an optical path between an airplane window and reflective material on the plane's engine. Retrieval of water vapor mixing ratios from a laser-based sensor
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