Validation of satellite ocean color primary products at optically complex coastal sites: Northern Adriatic Sea, Northern Baltic Proper and Gulf of Finland

Zibordi, Giuseppe; Berthon, Jean-François; Mélin, Frédéric; D’Alimonte, Davide; Kaitala, Seppo

doi:10.1016/j.rse.2009.07.013

Cited by 167 publications

(103 citation statements)

References 48 publications

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“…It is reminded that the processing and quality control are performed in agreement with the scheme presented in Zibordi et al (2009a). This implies the correction of the effects of non-isotropy of the in-water light field and surface reflectance following the method proposed by Morel et al (2002).…”

Section: In Situ Aeronet-oc Datamentioning

confidence: 97%

“…This potential source of uncertainty is minimized through the application of specific adjustment factors to the in situ L WN (i.e., band-shift correction) in agreement with the scheme outlined by Zibordi et al (2006), Mélin and Zibordi (2007) and Zibordi et al (2009a).…”

Section: Band-shift Correction and Regional Algorithmsmentioning

confidence: 99%

“…While site-specific algorithms were already provided for the AAOT in a different work (Zibordi et al, 2009a), regional algorithms applicable to GLR data have been developed using in situ BiOMaP data from the Western Black Sea. By bandshifting BiOMaP data, algorithms are proposed for both the MODIS-A center wavelengths and, consistent with previous investigations (see Zibordi et al, 2009a), also for the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) center wavelengths (i.e., 412, 443, 490, 510, 555 and 670 nm).…”

Section: Band-shift Correction and Regional Algorithmsmentioning

confidence: 99%

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In situ autonomous optical radiometry measurements for satellite ocean color validation in the Western Black Sea

et al. 2015

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Abstract. The accuracy of primary satellite ocean color data products from the Moderate Resolution Imaging Spectroradiometer on-board Aqua (MODIS-A) and the Visible/Infrared Imager/Radiometer Suite (VIIRS) is investigated in the Western Black Sea using in situ measurements from the Gloria site included in the ocean color component of the Aerosol Robotic Network (AERONET-OC). The analysis is also extended to an additional well-established AERONET-OC site in the northern Adriatic Sea characterized by optically complex coastal waters exhibiting similarities to those observed at the Gloria site. Results from the comparison of normalized water-leaving radiance L WN indicate biases of a few percent between satellite-derived and in situ data at the center wavelengths relevant for the determination of chlorophyll a concentrations (443-547 nm, or equivalent). Remarkable is the consistency between the annual cycle determined with time series of satellite-derived and in situ L WN ratios at these center wavelengths. Contrarily, the differences between in situ and satellite-derived L WN are pronounced at the blue (i.e., 412 nm) and red (i.e., 667 nm, or equivalent) center wavelengths, confirming difficulties in confidently applying satellite-derived radiometric data from these spectral regions for quantitative analysis in optically complex waters.

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Section: In Situ Aeronet-oc Datamentioning

confidence: 97%

Section: Band-shift Correction and Regional Algorithmsmentioning

confidence: 99%

Section: Band-shift Correction and Regional Algorithmsmentioning

confidence: 99%

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In situ autonomous optical radiometry measurements for satellite ocean color validation in the Western Black Sea

et al. 2015

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“…Because of this, to minimize the effects of differences in centerwavelengths between the satellite and SeaPRISM data products a band-shift correction scheme has been developed for the latter. These corrections are performed relying on a biooptical model requiring Chl a and IOP values estimated through regional empirical algorithms applied to spectral ratios of L wn (λ) (Zibordi et al, 2009b). Band-shift corrections have then been applied to SeaPRISM data products contributing to the ARC inter-comparison to match the reference center-wavelengths.…”

Section: Seaprismmentioning

confidence: 99%

In situ determination of the remote sensing reflectance: an inter-comparison

et al. 2012

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Abstract. Inter-comparison of data products from simultaneous measurements performed with independent systems and methods is a viable approach to assess the consistency of data and additionally to investigate uncertainties. Within such a context the inter-comparison called Assessment of In Situ Radiometric Capabilities for Coastal Water Remote Sensing Applications (ARC) was carried out at the Acqua Alta Oceanographic Tower in the northern Adriatic Sea to explore the accuracy of in situ data products from various in-and above-water optical systems and methods. Measurements were performed under almost ideal conditions, including a stable deployment platform, clear sky, relatively low sun zenith angles and moderately low sea state. Additionally, all optical sensors involved in the experiment were inter-calibrated through absolute radiometric calibration performed with the same standards and methods. Inter-compared data products include spectral waterleaving radiance L w (λ), above-water downward irradiance E d (0 + ,λ) and remote sensing reflectance R rs (λ). Data products from the various measurement systems/methods were directly compared to those from a single reference system/method. Results for R rs (λ) indicate spectrally averaged values of relative differences comprised between −1 and +6 %, while spectrally averaged values of absolute differences vary from approximately 6 % for the above-water systems/methods to 9 % for buoy-based systems/methods. The agreement between R rs (λ) spectral relative differences and estimates of combined uncertainties of the inter-compared systems/methods is noteworthy.

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“…This signal contribution is usually neglected by conventional atmospheric correction schemes applied to ocean color imagery. Investigations on uncertainties induced by adjacency effects at AERONET-OC sites have been already performed using both a simple parametric relationship [1] and analyzing the spatial variability of satellitederived products along transects extending from the coast and intercepting selected sites [3]. The somehow contradictive results underlined the need to further investigate the topic, modeling the effects with significantly increased accuracy.…”

Section: Introductionmentioning

confidence: 99%

Modeling the adjacency effects at AERONET-OC sites

Bulgarelli¹,

Zibordi²,

Kiselev³

2013

AIP Conference Proceedings

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Abstract.A methodology is presented to quantify the adjacency effects induced in satellite ocean color radiometric data by the presence of land in coastal regions. Specifically, the adjacency radiance, defined as the difference in top-ofatmosphere (TOA) signal when accounting for and when neglecting nearby mainland, is parameterized to decouple the dependence on the optical properties of land and water from those of atmosphere and sea surface, and from measurement geometry. The methodology is applied for a set of realistic satellite observation conditions, along a transect in the Northern Adriatic Sea crossing the Acqua Alta Oceanographic Tower (AAOT, 45.31N, 12.51E) ocean color validation site. The newly developed Novel Adjacency pertUrbation Simulator for CoastAl Areas (NAUSICAA) 3D backward MonteCarlo code and the well established highly accurate plane-parallel FEM radiative transfer code, are used to simulate signal contributions at TOA. Results at relevant ocean color center-wavelengths for the AAOT site indicate average adjacency radiance contributions at TOA lower than ±0.5% in the visible spectral region, while reaching about 2% at 765 and 865 nm. Summer cases exhibit values above the average, while the opposite is observed for winter cases. As expected, the largest adjacency contributions occur for slanted satellite observations from over the land.

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Validation of satellite ocean color primary products at optically complex coastal sites: Northern Adriatic Sea, Northern Baltic Proper and Gulf of Finland

Cited by 167 publications

References 48 publications

In situ autonomous optical radiometry measurements for satellite ocean color validation in the Western Black Sea

In situ autonomous optical radiometry measurements for satellite ocean color validation in the Western Black Sea

In situ determination of the remote sensing reflectance: an inter-comparison

Modeling the adjacency effects at AERONET-OC sites

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