Calibration of in situ chlorophyll fluorometers for organic matter

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http://hdl.handle.net/10138/336120

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Kuha, J., Järvinen, M., Salmi, P. et al. Calibration of in situ chlorophyll fluorometers for organic matter. Hydrobiologia 847, 4377–4387 (2020). https://doi.org/10.1007/s10750-019-04086-z

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Title: Calibration of in situ chlorophyll fluorometers for organic matter
Author: Kuha, Jonna; Järvinen, Marko; Salmi, Pauliina; Karjalainen, Juha
Publisher: Springer Link
Date: 2020
Language: en
Belongs to series: Hydrobiologia 847 21 (2020)
ISSN: 0018-8158
DOI: https://doi.org/10.1007/s10750-019-04086-z
URI: http://hdl.handle.net/10138/336120
Abstract: Organic matter (OM) other than living phytoplankton is known to affect fluorometric in situ assessments of chlorophyll in lakes. For this reason, calibrating fluorometric measurements for OM error is important. In this study, chlorophyll (Chl) fluores cence was measured in situ in multiple Finnish lakes using two sondes equipped with Chl fluorometers (ex.470/em.650–700 nm). OM absorbance (A420) was measured from water samples, and one of the two sondes was also equipped with in situ fluorometer for OM (ex.350/em.430 nm). The sonde with Chl and OM fluorometers was also deployed continuously on an automated water quality monitoring station on Lake Konnevesi. For data from multiple lakes, inclusion of water colour estimates into the calibration model improved the predictability of Chl assessments markedly. When OM absorbance or in situ OM fluorescence was used in the calibration model, predictability between the in situ Chl and laboratory Chl a assessments was also enhanced. However, correction was not superior to the one done with the water colour estimate. Our results demonstrated that correction with water colour assessments or in situ measurements of OM fluorescence offers practical means to overcome the variation due to OM when assessing Chl in humic lakes in situ.
Subject: automated monitoring
chlorophyll a
fluorescence
organic matter
optical sensors
water colour
calibration
in situ
lakes
humic lakes
Finland
Finnish lakes
Konnevesi
Jyväsjärvi
Vesijärvi
Vanajavesi
Central Finland
Southern Finland
Europe
Northern Europe
Subject (ysa): automaattinen seuranta
lehtivihreä
fluoresenssi
orgaaninen aine
optiset anturit
veden väri
kalibraatio
järvet
humusjärvet
Suomi
suomalaiset järvet
Keski-Suomi
Etelä-Suomi
Eurooppa
Pohjois-Eurooppa
Rights: CC BY 4.0


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