POSTER SESSION 2
10:30–12:30, Tuesday, September 15
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1331 | POSTER 26
IMPROVED ESTIMATES OF PARTICULATE ABSORPTION AND ATTENUATION WITH THE SEABIRD’S AC-S IN FLOW-THROUGH MODE USING A CDOM FLUOROMETER AND A NOVEL SCATTERING CORRECTION.
An established method to obtain high-resolution particulate optical properties consists of pumping whole water through sensors and periodically filtering the incoming water through a 0.2 μm filter, with the filtered portion used as the blank for computing the particulate properties.
Here, we present a method that uses continuous measurements of chromophoric dissolved organic material fluorescence (FCDOM) to improve the quality of the derived particulate absorption and attenuation. We interpolate the filtered absorption and attenuation spectra based the distribution of spectral changes of absorption or attenuation to changes in fluorescence of consecutive filtered measurements. We find this method to provide an improvement compared to the linear interpolation method in that more spectra pass quality control and are in better agreement with discrete samples.
Additionally, using discrete samples of particulate absorption collected with state-of-the-art laboratory techniques, we designed a novel scattering correction for measurements conducted with a Seabird Scientific AC-S, a commercial spectrophotometer for in situ measurements. It is a novel spectral correction that incorporates ideas and approaches previously published. We validate this correction against discrete measurements taken in European coastal waters, used in the design of the correction method, as well as with a completely independent data set of inline and discrete laboratory-analyzed samples from the North Atlantic.
Together, the application of these corrections significantly improves the estimates of particulate absorption. It supports the continued use of the AC-S in flow-through mode as a useful tool for the collection of inherent optical properties and its use to validate satellite-derived products.
Emmanuel Boss, University of Maine, [email protected], https://orcid.org/0000-0002-8334-9595
Guillaume Bourdin, University of Maine, [email protected], https://orcid.org/0000-0001-7608-5256
Patrick Gray, University of Maine, [email protected], https://orcid.org/0000-0002-8997-5255
David Doxaran, Laboratoire d’Océanographie de Villefranche, [email protected], https://orcid.org/0000-0002-9778-7780
Chiara Sentinelli, CNR, [email protected], https://orcid.org/0000-0002-8921-275X
Collin Roesler, Bowdoin College, [email protected], https://orcid.org/0000-0003-3839-2241
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
