# Southern Finland 2,000 Year Lake Level Reconstructions #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/22212 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/lakelevels/europe/finland/lehmalampi2012.txt # Description: NOAA location of the template # # # Archive: Lake Level Reconstruction # # Dataset DOI: # # Parameter_Keywords: population abundance, reconstruction #--------------------------------------- # Contribution_Date # Date: 2017-06-06 #--------------------------------------- # File_Last_Modified_Date # Date: 2017-06-06 #--------------------------------------- # Title # Study_Name: Southern Finland 2,000 Year Lake Level Reconstructions #--------------------------------------- # Investigators # Investigators: Luoto, T.P.; Nevalainen, L.; Sarmaja-Korjonen, K. #--------------------------------------- # Description_Notes_and_Keywords # Description: Lake level reconstructions, Iso Lehmälampi, Finland. #--------------------------------------- # Publication # Authors: Nevalainen, L. and Luoto, T.P. # Published_Date_or_Year: 2012 # Published_Title: Intralake training set of fossil Cladocera for paleohydrological inferences: evidence for multicentennial drought during the Medieval Climate Anomaly # Journal_Name: Ecohydrology # Volume: 5 # Edition: # Issue: 6 # Pages: 834-840 # Report Number: # DOI: 10.1002/eco.275 # Online_Resource: # Full_Citation: # Abstract: We investigated an intralake surface sediment data set for fossil Cladocera from Lake Pieni-Kauro, eastern Finland, with an objective to develop a paleohydrological inference model for lake level reconstructions. The Cladocera assemblages showed high heterogeneity among the sampling sites according to the water depth gradient, thus enabling the construction of a quantitative inference model for water level reconstructions. The strongest model was developed using weighted averaging with classical deshrinking regression. This model had a jackknifed coefficient of determination of 0.79 and a root mean squared error of prediction of 0.79m. We tested the performance of the model on previously available Cladocera stratigraphy and Cladocera-based and chironomid-based lake level reconstructions from Lake Iso Lehmälampi, southern Finland. The lake level reconstructions, based on different proxies and independent inference models, showed high levels of similarity, indicating a period of lower water table during the Medieval Climate Anomaly around 1000 ad. The results suggest that the applicability of intralake paleohydrological models may not be regionally restricted when applied to similar lake types and, therefore, provide an alternative perspective on paleolimnological training set design and paleoclimatological inferences. #--------------------------------------- # Publication # Authors: Nevalainen, L., Sarmaja-Korjonen, K. & Luoto, T.P. # Published_Date_or_Year: 2011 # Published_Title: Sedimentary Cladocera as indicators of past water-level changes in shallow northern lakes # Journal_Name: Quaternary Research # Volume: 75 # Edition: # Issue: 3 # Pages: 430-437 # Report Number: # DOI: 10.1016/j.yqres.2011.02.007 # Online_Resource: # Full_Citation: # Abstract: The usability of subfossil Cladocera assemblages in reconstructing long-term changes in lake level was examined by testing the relationship between Cladocera-based planktonic/littoral (P/L) ratio and water-level inference model in a surface-sediment dataset and in a 2000-yr sediment record in Finland. The relationships between measured and inferred water levels and P/L ratios were significant in the dataset, implying that littoral taxa are primarily deposited in shallow littoral areas, while planktonic cladocerans accumulate abundantly mainly in deepwater locations. The 2000-yr water-level reconstructions based on the water-level inference model and P/L ratio corresponded closely with each other and with a previously available midge-inferred water-level reconstruction from the same core, showing a period of lower water level around AD 300-1000 and suggesting that the methods are valid for paleolimnological and -climatological use. #--------------------------------------- # Publication # Authors: Tomi P. Luoto # Published_Date_or_Year: 2009 # Published_Title: A Finnish chironomid- and chaoborid-based inference model for reconstructing past lake levels # Journal_Name:Quaternary Science Reviews # Volume: 28 # Edition: # Issue: 15-16 # Pages: 1481-1489 # Report Number: # DOI: 10.1016/j.quascirev.2009.01.015 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0277379109000407 # Full_Citation: # Abstract: In the present study I utilize subfossil chironomid and chaoborid distributions in surface sediments of 68 shallow lakes. The aim is to develop a calibration model for past water-level reconstructions by applying weighted averaging-partial least squares (WA-PLS) techniques and to evaluate its potential applications and limitations. This study considers water depth at sampling sites, rather than maximum lake depth. The best of the water depth models developed uses three components and has a cross-validated coefficient of determination (r2jack) of 0.68 and root-mean-squared error of prediction (RMSEP) of 0.78 m. The model performance is tested on the sediment sequence of a previously studied lake from southern Finland that is known to have experienced past fluctuations in its water level. The water levels inferred are compared with results of chironomid-inferred air temperature reconstruction to ease separation of the effects of the variables. The reconstruction shows consistent results similar to those of previously published cladoceran planktonic:littoral ratios (P:Ls) from the same lake. However, the results indicate that factors other than depth and temperature, such as pollution, may possibly distort the inference results. The results suggest that in applying the midge-based water depth calibration model, it would be advantageous to use it together with an inference model for temperature and preferably in a multiproxy content where changes in water chemistry may be detected. The model can be useful in studies on past effective moisture variability that is closely related to climatic changes. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site Information # Site_Name: Iso Lehmälampi # Location: Europe>Northern Europe>Scandanavia>Finland # Country: Finland # Northernmost_Latitude: 64.33 # Southernmost_Latitude: 64.33 # Easternmost_Longitude: 24.6 # Westernmost_Longitude: 24.6 # Elevation: 92 m #--------------------------------------- # Data_Collection # Collection_Name: Lehmalampi2012LL # First_Year: 89 # Last_Year: 2000 # Time_Unit: AD # Core_Length: # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## Depth (cm) Sediment depth,,,cm,,,,,, ## Age AD Chronology,,,AD,,,,,, ## Cladocera(intralake)-water depth (m) Reconstructed lake depth,,,m,,Cladocera,,Transfer function,, ## Cladocera(multilake)-water depth (m) Reconstructed lake depth,,,m,,Cladocera,,Transfer function,, ## Chironomid-water depth (m) Reconstructed lake depth,,,m,,Chironomids,,Transfer function,, #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: Depth (cm) Age AD Cladocera(intralake)-water depth (m) Cladocera(multilake)-water depth (m) Chironomid-water depth (m) 0 2000 4.31566 3.77418 3.88491 1 1930 3.91921 3.81345 3.46734 2 1861 3.39343 3.58145 3.32421 3 1791 3.54412 3.65927 3.26829 4 1721 4.12677 3.55964 4.30569 5 1652 3.67399 3.54145 3.83505 6 1582 4.23409 3.78691 3.13258 7 1513 4.19066 3.62364 2.72103 8 1443 4.20855 3.892 2.49858 9 1373 4.63075 3.69564 3.00651 10 1304 4.1524 3.12058 2.93973 11 1234 4.44886 3.87724 3.49411 12 1165 4.22079 3.25185 3.02473 13 1095 3.67335 3.09055 1.93869 14 978 3.09039 2.67091 2.65729 15 862 2.77399 2.62909 2.50241 16 745 2.68975 2.79673 2.88605 17 629 2.70532 2.79673 2.44007 18 512 3.10427 2.63964 2.8811 19 442 3.22829 2.81127 3.08186 20 371 4.20785 2.96836 2.86672 21 301 3.56934 2.80836 3.37772 22 230 4.45188 3.77418 3.81691 23 160 4.19494 3.52182 3.79626 24 89 4.1323 3.63818 2.66032 25 850 4.76 0.304882 26 800 4.57 0.133596 27 750 4.22 0.131465 28 700 4.46 0.154362 29 660 4.88 0.154109 30 600 5.15 0.0705 31 560 5.20 0.301683 32 530 4.81 0.156675 33 510 5.28 0.23184 34 490 5.21 0.252332 35 470 4.57 0.385504