Temperature quenching of CDOM fluorescence sensors: temporal and spatial variability in the temperature response and a recommended temperature correction equation

Elizabeth Ryder, Eleanor Jennings, Elvira de Eyto, Mary Dillane, Caitriona NicAonghusa, Donald C. Pierson, Karen Moore, Martin Rouen, Russell Poole

Limnol. Oceanogr. Methods 10:1004-1010 (2012) | DOI: 10.4319/lom.2012.10.1004

ABSTRACT: Field-based instruments measuring chromophoric dissolved organic matter (CDOM) fluorescence are often used as a proxy for dissolved organic carbon concentrations in lakes and streams. CDOM fluorescence yield is, however, affected by water temperature at the time of measurement, a factor which varies on both diel and seasonal timescales. A temperature correction must therefore be applied to these data. We present data on temporal and site-specific variability in temperature quenching of CDOM fluorescence for water from a humic lake and one of its main inflows in the west of Ireland. In addition, we present a temperature compensation equation and show that this equation is an improvement on methods previously proposed.