POSTER SESSION 2
10:30–12:30, Tuesday, September 15
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1372 | POSTER 190
A LIDAR-BASED VARIABLE PATHLENGTH BACKSCATTERING TRANSMISSOMETER
Ocean carbon cycling and climate feedbacks depend critically on accurate measurements of inherent optical properties (IOPs). Recent advances in spaceborne and airborne ocean lidar (e.g., Behrenfeld et al., 2023) demonstrate that vertically resolved optical measurements are essential for extending the global climate record.
Emerging lidar approaches place new demands on in situ methods for measuring the inherent optical properties of ocean waters. Retrieval of depth-resolved particulate carbon from ship, airborne, and spaceborne lidar requires precise knowledge of beta(pi)—the volume scattering function at 180°—and robust beam attenuation across variable pathlengths. These parameters are critical for constraining lidar inversions and reconciling them with in situ and satellite observations. Recent papers (e.g., Lacour et al., 2020) note at least a factor of two uncertainty in beta(pi) at 532 nm.
We present a collaborative effort between Sea-Bird Scientific and BeamSea Associates to develop a compact, dual field-of-view (DFOV) variable pathlength backscattering transmissometer (VPBT) designed specifically for deployment on profiling platforms for ocean lidar validation and IOP retrieval of attenuation c(z) and volume scattering beta(pi, z). The prototype instrument uses full-waveform Lidar technology to capture two independent realizations of the water column scattering environment. DFOV-based inversion results using controlled (NIST-traceable polystyrene beads for which the phase function can be computed) and field environments demonstrate retrievals of beam attenuation and backscattering at 180°.
Eric Rehm, Sea-Bird Scientific, [email protected], https://orcid.org/0000-0002-8417-538X
Fraser Dalgleish, BeamSea Associates, [email protected]
Walter Britton, BeamSea Associates, [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
