Our monitoring in three lakes with annually laminated (varved) sediments has two overarching objectives: (1) measure the impacts of climate change on various local lake systems and (2) calibrate the sediment archives for being able to reconstruct climate and environmental changes in the past with a seasonal time resolution.
Lake sediment monitoring is carried out within the frame of the projects BaltRap and ICLEA and is part of the TERENO Observatory NE Germany.
Lake Tiefer See, Klocksin lake chain, Mecklenburg-Western Pomerania in the Natural Park Nossentiner-Schwinzer Heide
Coordinates: 53° 36' N / 12° 32' E
Height above sea level: 63 m
Maximum depth: 62,5 m
Lake area: 75 ha
Lake volume: 14 x 106 m3
Catchment area: 5,5 km2
Weather station (WXT520, Vaisala)
… on a stationary platform at the position of the deepest part of the lake for an automated measuring of meteorological parameters (air temperature, air pressure, precipitation, global radiation, PAR, wind direction and wind speed) every 10 minutes
Collector of precipitation (PALMEX)
… on the stationary platform for monthly determination of precipitation quantity and isotopic investigation of the rainwater
Dust collector, passive (Sigma 2)
… on the platform for monthly investigation of dust composition and fluxrate determination
Profiler buoy connected with water probe (EXO2-Multiparameter probe)
… automated measuring of water temperature, pH-value, conductivity, turbidity, oxygen content, redox potential and chlorophyll in the whole water column every meter up to 55 m at 12-hour intevals
Profiler connected with water probe (YSI-6600 v4)
… below the stationary platform for automated measuring of water temperature, pH-value, conductivity, turbidity, oxygen content, redox potential and chlorophyll in the whole water column every meter up to 55 m at 12-hour intervals
Secchi-depth
… for monthly check of the secchi-depth
Temperature-logger chain (HOBO Water Temp Pro v2)
… near the platform in 1-meter steps from 0 to 12 m and in 5-meter steps down to 55 m water depth for automated measuring of water temperature every 6 hours
Water isotopes
… monthly analyses of lake water in a water depth of 1, 3, 5, 7, 20, 50 m and of the monthly precipitation water (δD and δ18O)
Water filtration
… monthly sampling of lake water in 1, 3, 5, 7, 10, 20 and 50 m water depth (for each depth filtrate 3 l of lake water, catch the suspended solids on Whatman-glass microfiber filter (GF/F 47mm), freeze-drying and determine the dry weight) for investigation of suspended solids
Water chemistry
… monthly sampling of lake water in 1, 3, 5, 7, 10, 20, 40, 45 and 50 m water depth (titration for determination of alkalinity and DIC; afterwards subsampling in one filtered sample set and one additionally acidified sample set for later analyses)
4-cylinder trap (KC Denmark A/S)
… below the thermocline (12 m water depth) and at 50m water depth near the weather station for monthly sampling of lake sediment and determination of dry weight, geochemistry (TC, TOC, TN, CaCO3) and measurement of stable isotopes (δ13Corg, δ15N, δ13Ccarb and δ18Ocarb)
Sequential trap (TECHNICAP PPS 3/3)
… at 50 m water depth near the weather station for automated sampling of lake sediment every 15 days for determination of dry weight, geochemistry (TC, TOC, TN, CaCO3) and measurement of stable isotopes (δ13Corg, δ15N, δ13Ccarb and δ18Ocarb)
Double-cylinder trap (Uwitec)
… at 50 m water depth) near the weather station for biannual sampling of lake sediment and determination of dry weight, geochemistry (TC, TOC, TN, CaCO3) and measurement of stable isotopes (δ13Corg, δ15N, δ13Ccarb and δ18Ocarb)
- Roeser, P., Dräger, N., Brykała, D., Ott, F., Pinkerneil, S., Gierszewski, P., Lindemann, C., Plessen, B., Brademann, B., Kaszubski, M., Fojutowski, M., Schwab, M.J., Słowiński, M., Błaszkiewicz, M., Brauer, A. (2021). Advances in understanding formation of calcite varves: new insights from a dual lake monitoring approach. Boreas. | doi:10.1111/bor.12506
- Heine I, Brauer A, Heim B, Itzerott S, Kasprzak P, Kienel U, Kleinschmit B (2017) Monitoring of calcite precipitation in hardwater lakes with multi-spectral remote sensing archives. Water 9: 1–3. | doi:10.3390/w9010015
- Kienel U, Kirillin G, Brademann B, Plessen B, Lampe R, Brauer A (2017) Effects of spring warming and mixing duration on diatom deposition in deep Tiefer See, NE Germany. Journal of Paleolimnology 57: 37–49. | doi:10.1007/s10933-016-9925-z
- Dräger N, Theuerkauf M, Szeroczyńska K, Wulf S, Tjallingii R, Plessen B, Kienel U, Brauer A (2017) A varve micro-facies and varve preservation record of climate change and human impact for the last 6000 years at Lake Tiefer See (NE Germany). The Holocene 27: 450–464. | doi:10.1177/0959683616660173
- Wulf S, Dräger N, Ott F, Serb J, Appelt O, Guðmundsdóttir E, van den Bogaard C, Słowiński M, Błaszkiewicz M, Brauer A (2016) Holocene tephrostratigraphy of varved sediment records from Lakes Tiefer See (NE Germany) and Czechowskie (N Poland). Quaternary Science Reviews 132: 1–14. | doi:10.1016/j.quascirev.2015.11.007
- Theuerkauf M, Dräger N, Kienel U, Kuparinen A, Brauer A (2015) Effects of changes in land management practices on pollen productivity of open vegetation during the last century derived from varved lake sediments. The Holocene 25: 733–744. | doi:10.1177/0959683614567881
- Czymzik M, Muscheler R, Brauer A, Adolphi F, Ott F, Kienel U, Dräger N, Słowiński M, Aldahan A, Possnert G (2015) Solar cycles and depositional processes in annual 10Be from two varved lake sediment records. Earth and Planetary Science Letters 428: 44–51. | doi:10.1016/j.epsl.2015.07.037
- Kienel U, Dulski P, Ott F, Lorenz S, Brauer A (2013) Recently induced anoxia leading to the preservation of seasonal laminae in two NE-German lakes. Journal of Paleolimnology 50: 535–544. | doi:10.1007/s10933-013-9745-3
