Validation of Non-photochemical Quenching Corrections for Chlorophyll-a Measurements Aboard Ships of Opportunity

被引:7
作者
Travers-Smith, Hana [1 ]
Giannini, Fernanda [2 ]
Sastri, Akash R. [3 ,4 ]
Costa, Maycira [1 ]
机构
[1] Univ Victoria, Dept Geog, Victoria, BC V8W 3P6, Canada
[2] Univ Fed Rio Grande FURG, Inst Oceanograf, Lab Fitoplancton & Microorganismos Marinhos, Rio Grande, Brazil
[3] Univ Victoria, Dept Biol, Victoria, BC, Canada
[4] Fisheries & Oceans Canada, Inst Ocean Sci, Sidney, BC, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
non-photochemical-quenching; ships-of-opportunity; chlorophyll-a; fluorescence; in vivo fluorometry; phytoplankton biomass; JUAN-DE-FUCA; IN-SITU; BRITISH-COLUMBIA; PHYTOPLANKTON; FLUORESCENCE; STRAIT; GEORGIA; SATELLITE; COASTAL; VARIABILITY;
D O I
10.3389/fmars.2021.686750
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The in vivo fluorescence of chlorophyll-a is commonly used as a proxy for phytoplankton biomass. Measurement of in vivo fluorescence in the field is attractive because it can be made at high spatial temporal, and vertical resolution relative to discrete sampling and pigment extraction. Fluorometers installed on ships of opportunity provide a cost-effective alternative to many of the traditional sampling methods. However, fluorescence-based estimates of chlorophyll-a can be impacted by sensor calibration and biofouling, variations in phytoplankton taxonomy and physiology (such as non-photochemical quenching) and the influence of other fluorescing matters in the water. Several methods have been proposed to address these issues separately, but few studies have addressed the interaction of multiple sources of error in the in vivo Chl-a fluorescence signal. Here, we demonstrate a method to improve the accuracy of chlorophyll-a concentration retrieved from a coastal ferry system, operating in a dynamic estuarine system. First, we used HPLC chlorophyll-a measurements acquired in low-light conditions to correct sensor level bias. Next, we tested three methods to correct the effect of non-photochemical quenching and evaluated the accuracy of each method using HPLC. As our study area is in highly dynamic coastal waters, we also evaluated the accuracy of our correction procedure across a range of irradiance and biogeochemical conditions. We found that sensor bias accounted for a significant portion of error in the fluorescence signal. The NPQ correction developed by Davis et al. (2008) best improved correspondence between in vivo Chl-a fluorescence and HPLC-based measurement of extracted Chl-a. We suggest the use of this correction for in vivo Chl-a measurements along with pre-processing steps to correct potential sensor biofouling and bias.
引用
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页数:15
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