EARSeL eProceedings Vol. 3, No. 1, 127-135, 2004
Birgit Heim, Sylvia Magnussen, Hedi Oberhaensli and Hermann Kaufmann
Abstract
Citation EARSeL European Association of Remote Sensing Laboratories, Paris, France BIS-Verlag
Within the
paleoclimate project CONTINENT we use Sea viewing Wide Field of view Sensor
(SeaWiFS) data to assess information on the current behaviour of selected
climate proxies in Lake Baikal, Siberia. Suitable proxies include
optically-visible water constituents such as algae biomass and suspended
terrigenous matter, whose dynamics reflect the present-day climate bioproductivity
and the river discharge in the catchment area. Lake Baikal represents a
specific bio-optical water type with high local concentrations of organic
matter and low algae biomass concentrations. Field data show a remarkable
influence of coloured dissolved organic matter (CDOM) on the optical properties
of Lake Baikal's surface waters. For this case 2 water type, the SeaWiFS Data Analysis
System's (SeaDAS) standard atmospheric correction methods result in a considerable
overestimation of pigment concentration. Here we describe how we adapted the
SeaDAS software and developed techniques for a regional study on Lake Baikal. The
optically interacting water constituents are decorrelated with a Maximum Noise
Fraction (MNF) analysis that is a modified Principal Component Analyses (PCA). The
resultant SeaWiFS PC maps of terrigenous input and phytoplankton distribution
reveal the autochthonous and allochthonous influences on the CONTINENT coring
sites.
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History
Submitted: 07 August 2003
Revised: 18 December 2003
Accepted: 27 February 2004
Heim B, S Magnussen, H Oberhaensli & H Kaufmann, 2004. Case 2 Lake Baikal: Analyses of SeaWiFS data within the scope of the paleoclimate project CONTINENT. EARSeL eProceedings 3(1), 127-135
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