Hobart

Seminar Abstract

Friday 5 December 2008, 11.30am (Tas time)
CSIRO Auditorium, Hobart

Thomas Schroeder
Environmental Remote Sensing Group
CSIRO Land & Water
Canberra

CSIRO's new remote sensing algorithms for coastal water quality assessment in Tasmania and the Great Barrier Reef

Global ocean colour algorithms significantly overestimate chlorophyll concentrations for the CDOM dominated coastal waters around Tasmania and the optically complex coastal waters of the Great Barrier Reef. In this work we describe the development, application and validation of the coupling of two physics-based inversion algorithms with the objective to improve the accuracy of chlorophyll estimates from remote sensing data in coastal waters. In this application, the proposed coupled algorithms derive apparent and inherent optical properties from spectral radiance measurement of the Moderate Resolution Imaging Spectrometer (MODIS) on-board of the NASA Earth Observation Systems (EOS) Terra and Aqua spacecrafts. The proposed coupled algorithms are generic in nature and can be applied to any other ocean colour sensor, like MERIS, SeaWiFS or OCM. The retrieval of optical properties is composed of two steps. First, an atmospheric correction algorithm based on inverse modelling of radiative transfer simulations and artificial neural network (ANN) inversion, derives the remote sensing reflectance at mean sea level on a pixel-by-pixel basis. Second, the inherent optical properties and the concentrations of the optically active constituents are retrieved from atmospherically corrected spectra by inverting a semi-analytical model with a variable specific inherent optical properties (SIOP) parameterization. The underlying SIOP sets of the semi-analytical model were derived from in-situ optical measurements in Tasmanian and Great Barrier Reef coastal waters.

Seminar Recording

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Location:
CSIRO = Marine Laboratories Auditorium, Castray Esplanade, Hobart

For further information, or to schedule a seminar, contact:
To schedule a seminar, contact:
Clothilde Langlais, (Oceanographic seminars) CSIRO Marine and Atmospheric Research (03) 6232 5399
Natalie Kelly, (Biology/Modelling seminars) CSIRO Marine and Atmospheric Research 0438 452 483
Jillian Enraght-Moony, (seminar administrator) CSIRO Marine and Atmospheric Research (03) 6232 5320
Communications Manager, Antarctic Climate and Ecosystems CRC (03) 6226 2265
Margaret Hazelwood, Institute of Antarctic and Southern Ocean Studies (IASOS) University of Tasmania (03) 6226 2971

Last updated 21/07/09