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.