Share Email Print
cover

Proceedings Paper

Estimating chlorophyll concentrations in the optically complex waters of the North Aegean Sea from field and satellite ocean colour measurements
Author(s): P. G. Drakopoulos; A. C. Banks; G. Kakagiannis; A. P. Karageorgis; A. Lagaria; A. Papadopoulou; S. Psarra; N. Spyridakis; V. Zervakis
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

In the Aegean Sea and Eastern Mediterranean there are large discrepancies between in situ and satellite ocean colour derived chlorophyll concentrations. The quantity that is monitored by ocean colour satellites and that can be used in the estimation of chlorophyll concentration is the remote sensing reflectance, defined as the ratio of the water leaving spectral radiance to the downwelling spectral irradiance. It can be determined in the field, with either above or in-water radiance and irradiance measurements. The complex optical properties of the North-East Aegean Sea, including radiance and irradiance, were studied during the AegeanMarTech project. Chlorophyll concentration estimates were derived from simultaneous above and in-water radiometric measurements. These were validated against chlorophyll concentration field data and compared against concurrent MODIS data from which chlorophyll was derived using two simple empirical algorithms. It was found that the MedOC3 algorithm outperforms the operational OC3M-547 algorithm and produces the least bias when compared against HPLC derived in situ chlorophyll. It is concluded that the greatest uncertainty in the inversion arises due to CDOM absorption below the 488 nm band. The reflectance ratios indicated that there is always an excess of yellow matter present in the study area and the water type could not be characterized optically as ‘’typical open ocean” Case 1.

Paper Details

Date Published: 19 June 2015
PDF: 7 pages
Proc. SPIE 9535, Third International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2015), 95351I (19 June 2015); doi: 10.1117/12.2192571
Show Author Affiliations
P. G. Drakopoulos, Technological Educational Institute of Athens (Greece)
A. C. Banks, Hellenic Ctr. for Marine Research (Greece)
Institute for Environment and Sustainability (Italy)
G. Kakagiannis, Hellenic Ctr. for Marine Research (Greece)
A. P. Karageorgis, Hellenic Ctr. for Marine Research (Greece)
A. Lagaria, Hellenic Ctr. for Marine Research (Greece)
A. Papadopoulou, Hellenic Ctr. for Marine Research (Greece)
Univ. of the Aegean (Greece)
S. Psarra, Hellenic Ctr. for Marine Research (Greece)
N. Spyridakis, Hellenic Ctr. for Marine Research (Greece)
V. Zervakis, Univ. of the Aegean (Greece)


Published in SPIE Proceedings Vol. 9535:
Third International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2015)
Diofantos G. Hadjimitsis; Kyriacos Themistocleous; Silas Michaelides; Giorgos Papadavid, Editor(s)

© SPIE. Terms of Use
Back to Top