Chlorophyll and suspended sediment assessment in a ... - OzCoasts

Table of contentsExecutive summary ................................................................................................................... 1Introduction............................................................................................................................ 1Aim of the project .................................................................................................................. 2Main results ........................................................................................................................... 3Optical complexity of the Fitzroy Estuary–Keppel Bay system......................................... 3The new regional algorithm for processing MODIS data to chlorophyll andsuspended matter using the matrix inversion method ........................................... 3Comparing MIM estimates of chlorophyll and suspended matter values anddistribution with the biogeochemical model output ................................................ 4Recommendations ................................................................................................................ 61 Introduction ....................................................................................................................... 91.1 About this report........................................................................................................ 101.2 Remote sensing for coastal water quality monitoring ............................................... 111.2.1 Potential ............................................................................................................. 111.2.2 Tropical estuaries applications and user needs ................................................ 121.3 Remote sensing: a primer......................................................................................... 141.3.1 Light in water...................................................................................................... 141.3.2 Measuring and modelling the optical properties of coastal waters.................... 161.3.3 Chlorophyll as an integrative measure of nutrient status................................... 171.3.4 Total suspended sediment, light and Secchi depth ........................................... 191.3.5 Optical models ................................................................................................... 211.4 MODIS features and utility ........................................................................................ 241.4.1 Sensor capability................................................................................................ 241.4.2 Standard MODIS products................................................................................. 241.4.3 MODIS standard algorithms: NASA and SEADAS............................................ 261.4.4 Delivery of MODIS data ..................................................................................... 282 Optical characterisation and water quality in the Fitzroy Estuary–Keppel Bay region ... 312.1 Study area and fieldwork description ........................................................................ 312.1.1 Sampling ............................................................................................................ 312.2 Optical characterisation required for algorithm assessment..................................... 332.2.1 Spatial variability (September 2003).................................................................. 332.2.2 Temporal variability (August 2004) .................................................................... 382.3 Discussion of optical complexity ............................................................................... 393 Assessment of the accuracy of MODIS global algorithms for the Fitzroy River Estuary 413.1 Algorithm validation: an introduction to methodology ............................................... 413.2 In situ measurement match-ups of GBRMPA long-term monitoring chlorophyllvalues and MODIS-derived chlorophyll using global algorithms ...................... 43v