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Tammeorg O, Tuvikene L, Kondratyev S, Golosov S, Zverev I, Zadonskaya O, Nõges P. Opportunities for combining data of Estonian and Russian monitoring to reflect on water quality in large transboundary Lake Peipsi. JOURNAL OF GREAT LAKES RESEARCH 2022; 48:961-970. [PMID: 35958273 PMCID: PMC9353880 DOI: 10.1016/j.jglr.2022.05.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 05/14/2022] [Indexed: 06/15/2023]
Abstract
Lake Peipsi, one of the world's largest lakes, is shared between Estonia and Russia. The water quality in different parts of the lake has so far been assessed independently. Here we explore opportunities for combining data of Estonian and Russian monitoring. For that, we 1) analysed the compatibility of data for some water quality variables; 2) estimated the potential effects of the differences in sampling frequency; 3) provided a few regression models to calculate the missing data for months not sampled by the Russian side. Data of the concurrent Estonian and Russian sampling indicated a good compatibility. Estonian data analysis suggested that water quality assessment results are sensitive to sampling frequency. For example, total phosphorus (TP) in the largest basin showed a long-term decreasing trend in three month data that disappeared when data for other months were added. Disregarding some months may lead to under- or overestimation of certain factors with no consistency in the response of different basins. Hence, data of the whole ice-free period are recommended for an adequate water quality assessment. Furthermore, we demonstrated that monthly values of the water quality variables of the same year are autocorrelated. Based on this, we filled the gaps in the long-term data and compiled a dataset for the whole lake that enables its most comprehensive use in water quality assessment and management. Long-term data revealed no water quality improvement of Lake Peipsi. Further reduction of the external nutrient load is needed. Eutrophication is sustained by high internal phosphorus load.
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Affiliation(s)
- Olga Tammeorg
- Chair of Hydrobiology and Fisheries, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
- Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Viikinkaari 1, 00014 Helsinki, Finland
| | - Lea Tuvikene
- Chair of Hydrobiology and Fisheries, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
| | - Sergey Kondratyev
- Institute of Limnology, Russian Academy of Sciences, ul. Sevast’yanova 9, St. Petersburg 199105, Russia
| | - Sergey Golosov
- Institute of Limnology, Russian Academy of Sciences, ul. Sevast’yanova 9, St. Petersburg 199105, Russia
| | - Ilya Zverev
- Institute of Limnology, Russian Academy of Sciences, ul. Sevast’yanova 9, St. Petersburg 199105, Russia
| | - Olga Zadonskaya
- State Hydrological Institute, 23, 2-ia liniia V.O., St. Petersburg 199053, Russia
| | - Peeter Nõges
- Chair of Hydrobiology and Fisheries, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
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Free G, Bresciani M, Pinardi M, Giardino C, Alikas K, Kangro K, Rõõm EI, Vaičiūtė D, Bučas M, Tiškus E, Hommersom A, Laanen M, Peters S. Detecting Climate Driven Changes in Chlorophyll-a Using High Frequency Monitoring: The Impact of the 2019 European Heatwave in Three Contrasting Aquatic Systems. SENSORS 2021; 21:s21186242. [PMID: 34577449 PMCID: PMC8473262 DOI: 10.3390/s21186242] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/10/2021] [Accepted: 09/14/2021] [Indexed: 01/02/2023]
Abstract
The frequency of heatwave events in Europe is increasing as a result of climate change. This can have implications for the water quality and ecological functioning of aquatic systems. We deployed three spectroradiometer WISPstations at three sites in Europe (Italy, Estonia, and Lithuania/Russia) to measure chlorophyll-a at high frequency. A heatwave in July 2019 occurred with record daily maximum temperatures over 40 °C in parts of Europe. The effects of the resulting storm that ended the heatwave were more discernable than the heatwave itself. Following the storm, chlorophyll-a concentrations increased markedly in two of the lakes and remained high for the duration of the summer while at one site concentrations increased linearly. Heatwaves and subsequent storms appeared to play an important role in structuring the phenology of the primary producers, with wider implications for lake functioning. Chlorophyll-a peaked in early September, after which a wind event dissipated concentrations until calmer conditions returned. Synoptic coordinated high frequency monitoring needs to be advanced in Europe as part of water management policy and to improve knowledge on the implications of climate change. Lakes, as dynamic ecosystems with fast moving species-succession, provide a prism to observe the scale of future change.
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Affiliation(s)
- Gary Free
- Institute of Electromagnetic Sensing of the Environment, National Research Council of Italy (CNR-IREA), via Bassini 15, 20133 Milan, Italy; (M.B.); (M.P.); (C.G.)
- Correspondence:
| | - Mariano Bresciani
- Institute of Electromagnetic Sensing of the Environment, National Research Council of Italy (CNR-IREA), via Bassini 15, 20133 Milan, Italy; (M.B.); (M.P.); (C.G.)
| | - Monica Pinardi
- Institute of Electromagnetic Sensing of the Environment, National Research Council of Italy (CNR-IREA), via Bassini 15, 20133 Milan, Italy; (M.B.); (M.P.); (C.G.)
| | - Claudia Giardino
- Institute of Electromagnetic Sensing of the Environment, National Research Council of Italy (CNR-IREA), via Bassini 15, 20133 Milan, Italy; (M.B.); (M.P.); (C.G.)
| | - Krista Alikas
- Tartu Observatory, University of Tartu, Observatooriumi 1, Tõravere, 61602 Tartu, Estonia; (K.A.); (K.K.)
| | - Kersti Kangro
- Tartu Observatory, University of Tartu, Observatooriumi 1, Tõravere, 61602 Tartu, Estonia; (K.A.); (K.K.)
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia;
| | - Eva-Ingrid Rõõm
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia;
| | - Diana Vaičiūtė
- Marine Research Institute, Klaipėda University, Universiteto Ave. 17, 92294 Klaipėda, Lithuania; (D.V.); (M.B.); (E.T.)
| | - Martynas Bučas
- Marine Research Institute, Klaipėda University, Universiteto Ave. 17, 92294 Klaipėda, Lithuania; (D.V.); (M.B.); (E.T.)
| | - Edvinas Tiškus
- Marine Research Institute, Klaipėda University, Universiteto Ave. 17, 92294 Klaipėda, Lithuania; (D.V.); (M.B.); (E.T.)
| | - Annelies Hommersom
- Water Insight, Fahrenheitstraat 42, 6716 BR Ede, The Netherlands; (A.H.); (M.L.); (S.P.)
| | - Marnix Laanen
- Water Insight, Fahrenheitstraat 42, 6716 BR Ede, The Netherlands; (A.H.); (M.L.); (S.P.)
| | - Steef Peters
- Water Insight, Fahrenheitstraat 42, 6716 BR Ede, The Netherlands; (A.H.); (M.L.); (S.P.)
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