In this presentation we describe the application of a previously developed technique that is now being used to correct the daytime polarization calibration of the CALIPSO lidar. The technique leverages the fact that the solar radiation background signals from dense cirrus clouds are largely unpolarized due to the internal multiple reflections within the non-spherical ice particles and the multiple scattering that occurs among these particles. Therefore, the ratio of polarization components of the cirrus background signals provides a good estimate for the polarization gain ratio (PGR) of the lidar. However, in the visible and ultraviolet regime, the molecular contribution is too large to be ignored, and thus corrections must be applied to account for the highly polarizing characteristics of the molecular scattering. This presentation describes the theory and implementation of the molecular scattering correction.
We have developed a new aerosol retrieval technique based on combing high-resolution A band spectra with lidar profiles. Our goal is the development of a technique to retrieve aerosol absorption, one of the critical parameters affecting the global radiation budget and one which is currently poorly constrained by satellite measurements. Our approach relies on two key factors: 1) the use of high spectral resolution (17,000:1) measurements which resolve the Aband line structure, and 2) the use of co-located lidar profile measurements to constrain the vertical distribution of scatterers in the forward model. The algorithm has been developed to be applied to observations from the CALIPSO and OCO-2 satellites, flying in formation as part of the A-train constellation. We describe the approach and present simulated retrievals to illustrate performance potential.
We have developed a Vector Radiative Transfer (VRT) code for coupled atmosphere and ocean systems based
on the successive order of scattering (SOS) method. In order to achieve efficiency and maintain accuracy, the
scattering matrix is expanded in terms of the Wigner d functions and the delta fit or delta-M technique is used
to truncate the commonly-present large forward scattering peak. To further improve the accuracy of the SOS
code, we have implemented the analytical first order scattering treatment using the exact scattering matrix of
the medium in the SOS code. The expansion and truncation techniques are kept for higher order scattering. The
exact first order scattering correction was originally published by Nakajima and Takana.1 A new contribution of
this work is to account for the exact secondary light scattering caused by the light reflected by and transmitted
through the rough air-sea interface.
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