Differential absorption radar techniques: water vapor retrievals

Atmospheric Pre-corrected Differential Absorption Techniques to Retrieve Columnar Water Vapor: Theory and Simulations

The advantage of the rst approach is computational speed and of the second, improved retrieval accuracy. Our goal was to improve the accuracy of the rst technique using physics based on radiative transfer. Using a modi ed version of the Duntley equation (Middleton, 1952, p.68) we derived an \Atmospheric Pre-corrected Di erential Absorption" (APDA) technique and described an iterative scheme to ...

Transmitter design for differential absorption water vapor LIDAR

We present a stabilized master-laser power-amplifier system for ground-based differential absorption LIDAR (DIAL) for profiling atmospheric water vapor. This system consists of two CW master lasers with the wavelength of each master laser actively stabilized. The system employs GaAlAs laser diodes for both the master lasers and the tapered laser amplifier. The on-line master laser is currently ...

Towards quantitative atmospheric water vapor profiling with differential absorption lidar.

Differential Absorption Lidar (DIAL) is a powerful laser-based technique for trace gas profiling of the atmosphere. However, this technique is still under active development requiring precise and accurate wavelength stabilization, as well as accurate spectroscopic parameters of the specific resonance line and the effective absorption cross-section of the system. In this paper we describe a nove...

Differential-Absorption Lidar for Water Vapor and Temperature Profiling

Columnar water vapor retrievals from multifilter rotating shadowband radiometer data

[1] The multifilter rotating shadowband radiometer (MFRSR) measures direct and diffuse irradiances in the visible and near-infrared spectral range. In addition to characteristics of atmospheric aerosols, MFRSR data also allow retrieval of precipitable water vapor (PWV) column amounts, which are determined from the direct normal irradiances in the 940-nm spectral channel. The HITRAN 2004 spectra...