Calibration of in situ chlorophyll fluorometers for organic matter

• DOI: 10.1007/s10750-019-04086-z
• Publication Date: 2019-11-05T17:03:16Z
• Authors: Jonna Kuha; Marko Järvinen; Pauliina Salmi; Juha Karjalainen
• Keywords: Fluorometer; Absorbance

Abstract Organic matter (OM) other than living phytoplankton is known to affect fluorometric in situ assessments of chlorophyll lakes. For this reason, calibrating measurements for OM error important. In study, (Chl) fluorescence was measured multiple Finnish lakes using two sondes equipped with Chl fluorometers (ex.470/em.650–700 nm). absorbance (A 420 ) from water samples, and one the also fluorometer (ex.350/em.430 The sonde deployed continuously on an automated quality monitoring station Lake Konnevesi. data lakes, inclusion colour estimates into calibration model improved predictability markedly. When or used model, between laboratory a enhanced. However, correction not superior done estimate. Our results demonstrated that offers practical means overcome variation due when assessing humic situ.