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Satellite remote sensing of phytoplankton phenology in Lake Balaton using 10 years of MERIS observations

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journal contribution
posted on 08.01.2015, 12:28 by S. C. J. Palmer, D. Odermatt, P. D. Hunter, C. Brockmann, M. Présing, Heiko Balzter, V. R. Tóth
Phytoplankton biomass is important to monitor in lakes due to its influence on water quality and lake productivity. Phytoplankton has also been identified as sensitive to environmental change, with shifts in the seasonality of blooms, or phenology, resulting from changing temperature and nutrient conditions. A satellite remote sensing approach to retrieving and mapping freshwater phytoplankton phenology is demonstrated here in application to Lake Balaton, Hungary. Chlorophyll-a (chl-a) concentration mapping using Medium Resolution Imaging Spectrometer (MERIS) allows new insights into such spatiotemporal dynamics for Lake Balaton as bloom start, peak and end timing, duration, maximum chl-a concentrations, spatial extent, rates of increase and decrease, and bloom chl-a concentration integral. TIMESAT software is used to extract and map these phenology metrics. Three approaches to time series smoothing are compared and mapped metrics are evaluated in comparison with phenology metrics of in situ chl-a. The high degree of both spatial and temporal variability is highlighted and discussed, as are methodological limitations and correlation between phenology metrics. Both the feasibility of and novel insights permitted through such phenology mapping are demonstrated, and priority topics for future research are suggested.

Funding

GIONET, funded by the European Commission, Marie Curie Programme Initial Training Network, Grant Agreement PITN-GA-2010-264509, NERC-funded GloboLakes project (NE/J024279/1, ESA Diversity-II project (ESRIN/AO/1-7025/12/I-LG). S. Palmer was supported by a doctoral scholarship from the Fonds de Recherche du Québec — Nature et Technologies (B2-05D-146316). H. Balzter was supported by the Royal Society Wolfson Research Merit Award, 2011/R3.

History

Citation

Remote Sensing of Environment 158 (2015) 441–452

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Geography/GIS and Remote Sensing

Version

VoR (Version of Record)

Published in

Remote Sensing of Environment 158 (2015) 441–452

Publisher

Elsevier

issn

0034-4257

eissn

1879-0704

Available date

08/01/2015

Publisher version

http://www.sciencedirect.com/science/article/pii/S0034425714004738

Language

en