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Chase, A. P., Atmospheric and Environmental Research, Inc, Lexington, USA, achase@aer.com
Omand, M. M., Woods Hole Oceanographic Institution, Woods Hole, USA, momand@whoi.edu
Dave, A. ., Duke University, Durham, USA, apurva.dave@duke.edu
Freitas, F. H., University of California Santa Barbara, Santa Barbara, USA, fer.henderikx@gmail.com
Reisinger, A. ., Texas A&M University - Corpus Christi, Corpus Christi, USA, Anthony.Reisinger@tamucc.edu
Arellano, A. R., University of South Florida, St Petersburg, USA, aarellan@mail.usf.edu

OBTAINING QUALITY AC-S METER SPECTRA: A METHOD FOR TEMPERATURE AND RESIDUAL SCATTERING CORRECTIONS

The ac-spectra (ac-s) in-situ spectrophotometer (WETLabs) measures the absorption a(λ) and beam attenuation c(λ) spectra of water samples, either in the laboratory or the field. The high spectral resolution (4nm) of the instrument allows for precise temperature and scattering corrections to be applied during data processing. Here we present ac-s data collected in the Gulf of Maine as part of the 2011 Ocean Optics Summer Course. We show a technique for deriving accurate water temperature from the residual correction of the a(λ) and c(λ) data, and explore a method for diagnosing errors induced by variable flow-rate of the instrument package. We also examine a method to correct for residual scattering in the ap (λ) data and simultaneously separate ap(λ) into anap(λ) and aφ (λ) components. All of these steps, displayed here in a schematic diagram, are critical for accurate calibration-independent in-situ corrections of ac-s data. Determining appropriate processing and correction methods for ac-s data is essential for the field of optical oceanography, as hyperspectral measurements are increasingly used to both diagnose in-situ properties and relate them to remotely sensed quantities.

Poster presentation

Session #:148
Date: 2/22/2012
Time: 17:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: A0336