Abstract
As it can strongly influence the availability of light and thus primary production, coloured dissolved organic matter
(CDOM) affects the function of lake ecosystems. Therefore reliable methods are required for the monitoring of CDOM
concentration. A new method using downwelling irradiance was tested for applicability in four selected lakes of the
Bavarian Osterseen Lake District, which consists of 19 naturally connected freshwater lakes of different trophic level.
The method separates between the direct and diffuse part of the incident light in order to handle the strong variability of
the underwater light field. It is implemented in the software WASI, which is capable to retrieve water constituents by
inverse modeling. During field campaigns downwelling irradiance measurements using RAMSES sensors were made in
different depths. Simultaneously, water samples were taken in three depths (0.5 m, 2 m and Secchi disk depth), from
which the absorption coefficient of CDOM, aY, was derived in the range from 190 to 900 nm using photometric
absorption measurements. Concentration (defined as aY at 440 nm) ranged from 0.33 to 1.55 m-1 with a mean of 0.71 m-1
± 0.04 m-1, the spectral slope at 440 nm from 0.0120 to 0.0184 nm-1 with a mean of 0.0145 ± 0.0008 nm-1. These
laboratory measurements from water samples were compared to CDOM concentration obtained by inverse modeling of
downwelling irradiance measurements using WASI. For sensor depths lower than 1 to 1.5 m large uncertainties were
observed. The measurements in 2 m depth and at Secchi disk depth yielded good correlation between water sample and
WASI derived data (R2 = 0.87) with a mean standard deviation of 0.06 m-1 for the determined CDOM concentrations. This new method is an alternative to laboratory analysis of water samples from in situ measurements of CDOM
concentration.
