Algorithm development and validation of CDOM properties for estuarine and continental shelf waters along the northeastern U.S. coast

Mannino, Antonio; Novak, Michael; Hooker, Stanford B.; Hyde, K.; Aurin, Dirk

doi:10.1016/j.rse.2014.06.027

Cited by 106 publications

(82 citation statements)

References 79 publications

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“…In all cases, a least squares analysis was carried out in order to identify the best relationship between the dependent variable, the CDOM absorption coefficient aCDOM355, and the independent variables. As independent variables, the following MODIS Rrs band ratios were considered: (a) Rrs (547) [23,37,39,76]. However, the reference wavelength at 547 nm is affected by particles light scattering [77] that in coastal waters interferes with the CDOM retrieval.…”

Section: Cdom Modelsmentioning

confidence: 99%

“…Having a consistent number of in situ and satellite data, the main aim of this work is on the definition of empirical models useful to effectively retrieve a CDOM 355 values using the optical satellite data acquired on the northwestern Adriatic coastal sea waters. Simple linear algorithms were chosen among several algorithms available in literature for CDOM retrieval, as they proved to be nearly effective with respect to the more complex models in CDOM retrieval [39]. On the other hand, empirical algorithms are known to be valid only regionally as they are particularly sensitive to changes in the specific composition of water constituents when boundary conditions are changed [75].…”

Section: Cdom Modelsmentioning

confidence: 99%

“…As independent variables, the following MODIS R rs band ratios were considered: (a) R rs (547)/R rs (412); (b) R rs (547)/R rs (488); (c) R rs (667)/R rs (412); (d) R rs (667)/R rs (488); (e) R rs (667)/R rs (443); and (f) R rs (531)/R rs (412). The inverse band ratios (a) and (b), i.e., R rs (412)/R rs (547) and R rs (488)/R rs (547), were used to define empirical algorithms in coastal waters by many authors [23,37,39,76]. However, the reference wavelength at 547 nm is affected by particles light scattering [77] that in coastal waters interferes with the CDOM retrieval.…”

Section: Cdom Modelsmentioning

confidence: 99%

“…2017, 9, 180 7 of 22 red or near infrared (667 nm) was added as numerator of the band ratios (c) and (d) in order to reduce the effects of detritus particles, as suggested by other authors [40,78,79]. At first, a simple multilinear model was tested by ordinary least square (OLS) using both the dependent and the independent variables transformed according to the log function [39]. This first analysis provided a quite low value of the adjusted coefficient of determination (adjusted R 2 = 0.5671).…”

Section: Cdom Modelsmentioning

confidence: 99%

See 3 more Smart Citations

An Empirical Ocean Colour Algorithm for Estimating the Contribution of Coloured Dissolved Organic Matter in North-Central Western Adriatic Sea

et al. 2017

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Abstract:The performance of empirical band ratio models were evaluated for the estimation of Coloured Dissolved Organic Matter (CDOM) using MODIS ocean colour sensor images and data collected on the North-Central Western Adriatic Sea (Mediterranean Sea). Relationships between in situ measurements (2013-2016) of CDOM absorption coefficients at 355 nm (a CDOM 355) with several MODIS satellite band ratios were evaluated on a test data set. The prediction capability of the different linear models was assessed on a validation data set. Based on some statistical diagnostic parameters (R 2 , APD and RMSE), the best MODIS band ratio performance in retrieving CDOM was obtained by a simple linear model of the transformed dependent variable using the remote sensing reflectance band ratio R rs (667)/R rs (488) as the only independent variable. The best-retrieved CDOM algorithm provides very good results for the complex coastal area along the North-Central Western Adriatic Sea where the Po River outflow is the main driving force in CDOM and nutrient circulation, which in winter mostly remains confined to a coastal boundary layer, whereas in summer it spreads to the open sea as well.

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Section: Cdom Modelsmentioning

confidence: 99%

Section: Cdom Modelsmentioning

confidence: 99%

Section: Cdom Modelsmentioning

confidence: 99%

Section: Cdom Modelsmentioning

confidence: 99%

See 2 more Smart Citations

An Empirical Ocean Colour Algorithm for Estimating the Contribution of Coloured Dissolved Organic Matter in North-Central Western Adriatic Sea

et al. 2017

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“…Furthermore, CDOM absorption could be estimated from the dual wavelength Kd measurements [14], while dual wavelength backscatter and extinction retrievals could provide information on particle size distributions [15] and composition. By extending these developments to a space-based lidar, significant advances could be realized in quantifying ocean carbon cycle processes.…”

Section: Comparisons Between Aircraft Lidar and In Water Measurementsmentioning

confidence: 99%

Ocean Lidar Measurements of Beam Attenuation and a Roadmap to Accurate Phytoplankton Biomass Estimates

Behrenfeld

Hostetler

et al. 2016

EPJ Web of Conferences

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Beam attenuation coefficient, c, provides an important optical index of plankton standing stocks, such as phytoplankton biomass and total particulate carbon concentration. Unfortunately, c has proven difficult to quantify through remote sensing. Here, we introduce an innovative approach for estimating c using lidar depolarization measurements and diffuse attenuation coefficients from ocean color products or lidar measurements of Brillouin scattering. The new approach is based on a theoretical formula established from Monte Carlo simulations that links the depolarization ratio of sea water to the ratio of diffuse attenuation Kd and beam attenuation C (i.e., a multiple scattering factor).On July 17, 2014, the CALIPSO satellite was tilted 30° off-nadir for one nighttime orbit in order to minimize ocean surface backscatter and demonstrate the lidar ocean subsurface measurement concept from space. Depolarization ratios of ocean subsurface backscatter are measured accurately. Beam attenuation coefficients computed from the depolarization ratio measurements compare well with empirical estimates from ocean color measurements. We further verify the beam attenuation coefficient retrievals using aircraftbased high spectral resolution lidar (HSRL) data that are collocated with in-water optical measurements.

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Toward a quantitative and empirical dissolved organic carbon budget for the Gulf of Maine, a semienclosed shelf sea

Balch

Huntington

Aiken

et al. 2016

Global Biogeochemical Cycles

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A time series of organic carbon export from Gulf of Maine (GoM) watersheds was compared to a time series of biological, chemical, bio-optical, and hydrographic properties, measured across the GoM between Yarmouth, NS, Canada, and Portland, ME, U.S. Optical proxies were used to quantify the dissolved organic carbon (DOC) and particulate organic carbon in the GoM. The Load Estimator regression model applied to river discharge data demonstrated that riverine DOC export (and its decadal variance) has increased over the last 80 years. Several extraordinarily wet years (2006)(2007)(2008)(2009)(2010) resulted in a massive pulse of chromophoric dissolved organic matter (CDOM; proxy for DOC) into the western GoM along with unidentified optically scattering material (<0.2 μm diameter). A survey of DOC in the GoM and Scotian Shelf showed the strong influence of the Gulf of Saint Lawrence on the DOC that enters the GoM. A deep plume of CDOM-rich water was observed near the coast of Maine which decreased in concentration eastward. The Forel-Ule color scale was derived and compared to the same measurements made in 1912-1913 by Henry Bigelow. Results show that the GoM has yellowed in the last century, particularly in the region of the extension of the Eastern Maine Coastal Current. Time lags between DOC discharge and its appearance in the GoM increased with distance from the river mouths. Algae were also a significant source of DOC but not CDOM. Gulf-wide algal primary production has decreased. Increases in precipitation and DOC discharge to the GoM are predicted over the next century.

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Algorithm development and validation of CDOM properties for estuarine and continental shelf waters along the northeastern U.S. coast

Cited by 106 publications

References 79 publications

An Empirical Ocean Colour Algorithm for Estimating the Contribution of Coloured Dissolved Organic Matter in North-Central Western Adriatic Sea

An Empirical Ocean Colour Algorithm for Estimating the Contribution of Coloured Dissolved Organic Matter in North-Central Western Adriatic Sea

Ocean Lidar Measurements of Beam Attenuation and a Roadmap to Accurate Phytoplankton Biomass Estimates

Toward a quantitative and empirical dissolved organic carbon budget for the Gulf of Maine, a semienclosed shelf sea

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