# ISOMED Mediterranean Lakes Late Quaternary Oxygen Isotope Data #----------------------------------------------------------------------- # 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 Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/24450 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/turkey/akgol2008d18o.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleolimnology # # Dataset DOI: # # Parameter_Keywords: oxygen isotopes #-------------------- # Contribution_Date # Date: 2013-07-08 #-------------------- # File_Last_Modified_Date # Date: 2013-07-08 #-------------------- # Title # Study_Name: ISOMED Mediterranean Lakes Late Quaternary Oxygen Isotope Data #-------------------- # Investigators # Investigators: Roberts, N.; Jones, M.D.; Benkaddour, A.; Eastwood, W.J.; Filippi, M.L.; Frogley, M.R.; Lamb, H.F.; Leng, M.J.; Reed, J.M.; Stein, M.; Stevens, L.; Valero-Garces, B.; Zanchetta, G. #-------------------- # Description_Notes_and_Keywords # Description: Oxygen isotope (d18O) data from late Quaternary sediments collected in 8 lakes in the Mediterranean region. # All data are 3 point running mean d18O values, except where stated. Chronologies are based on linear interpolation between calibrated 14C dates # (using OxCal) or U-Th ages, except where stated. Analysis on authigenic carbonate, except where stated. # Note: composite record from cores AGL94A and ADA77 # #-------------------- # Publication # Authors: Roberts, N., M.D. Jones, A. Benkaddour, W.J. Eastwood, M.L. Filippi, M.R. Frogley, H.F. Lamb, M.J. Leng, J.M. Reed, M. Stein, L. Stevens, B. Valero-Garces, and G. Zanchetta # Published_Date_or_Year: 2008-12-01 # Published_Title: Stable isotope records of Late Quaternary climate and hydrology from Mediterranean lakes: the ISOMED synthesis # Journal_Name: Quaternary Science Reviews # Volume: 27 # Edition: # Issue: 25-26 # Pages: 2426-2441 # Report_Number: # DOI: 10.1016/j.quascirev.2008.09.005 # Online_Resource: https://www.sciencedirect.com/science/article/pii/S0277379108002230 # Full_Citation: # Abstract: Lake isotope records can be used to assess the spatial coherency of Late Quaternary climate change across the circum-Mediterranean region. We place modern and palaeo-data within a simple conceptual lake response model to show that the isotope hydrology of most Mediterranean lakes has been influenced strongly by water balance, even in those systems that are chemically dilute (i.e. freshwater). d18O data on biogenic and endogenic carbonates from 24 lake basins are used to reconstruct multi-millennial-scale trends since the LGM. While it is difficult to make direct comparisons between lake records in terms of single climatic parameters, coherent regional isotopic trends can be identified. During glacial times Mediterranean lakes deposited carbonates isotopically heavier in d18O compared to the Holocene, partly due to source area effects. Isotopic enrichment was most marked during intervals corresponding to the H1 and Younger Dryas events, confirming that Late Pleistocene cold stages in the North Atlantic region were marked by aridity around much of the Mediterranean. Almost all Mediterranean lake records shifted to more depleted isotopic values during the Last Glacial-Interglacial Transition (LGIT). This shift is the reverse of the trend which characterised the same transition in lakes from northern and central Europe, and suggests that temperature changes were not an important direct driver of Mediterranean lake isotopic records over glacial-interglacial timescales. In the early Holocene, many lakes in the eastern part of the region were more depleted isotopically than in recent millennia. This corresponds with marine sapropel formation, both chronologically and geographically, and implies that increases in local rainfall contributed significantly to the creation of a freshwater lid and anoxia in the East Mediterranean Sea. In contrast, no such pattern is currently apparent from lake isotope records from the West Mediterranean, suggesting a possible NW-SE contrast in climate history during the Holocene. #------------------ # Publication # Authors: Melanie J. Leng, Neil Roberts, Jane M. Reed, Hilary J. Sloane # Published_Date_or_Year: 1999-09-01 # Published_Title: Late Quaternary palaeohydrology of the Konya Basin, Turkey, based on isotope studies of modern hydrology and lacustrine carbonates # Journal_Name: Journal of Paleolimnology # Volume: 22 # Edition: # Issue: 2 # Pages: 187-204 # Report_Number: # DOI: 10.1023/A:1008024127346 # Online_Resource: https://link.springer.com/article/10.1023/A%3A1008024127346 # Full_Citation: # Abstract: The Konya plain in south central Anatolia, Turkey, which is now largely dry, was occupied around the time of the Last Glacial Maximum by a fresh-oligosaline lake covering more than 4000 km2. Sediment cores from three residual water bodies (Pinarbasi, Akgol and Suleymanhaci) within the larger Pleistocene lake basin, have been analysed using a multidisciplinary approach. The sediment sequences are dated as spanning the last 50 Ka years, although breaks in sedimentation mean that there is only partial chronological overlap between them. Carbon and oxygen isotope analyses on lacustrine carbonate from the three cores give contrasting isotope profiles which reflect the different ages and independent hydrological behaviour of different sub-basins through the late Quaternary. Distinguishing changes that are regional from local effects is aided by modern isotope hydrology studies and by comparing the carbonate d13C and d18O values to diatom and other analyses undertaken on the same cores. #------------------ # Funding_Agency # Funding_Agency_Name: # Grant: #------------------ # Site_Information # Site_Name: Lake Akgol # Location: Asia>Western Asia>Turkey # Country: Turkey # Northernmost_Latitude: 37.63 # Southernmost_Latitude: 37.63 # Easternmost_Longitude: 33.583 # Westernmost_Longitude: 33.583 # Elevation: m #------------------ # Data_Collection # Collection_Name: Akgol2008d18O # Earliest_Year: 15752 # Most_Recent_Year: 2692 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## age_calBP age, , , calendar years before present, , , , ,N, ## d18O delta 18O, calcium carbonate, , per mil, ,paleolimnology,3 point running mean,isotope ratio mass spectrometry,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_calBP d18O 2692 -3.67 3109 -2.95 3149 -2.85 3697 -2.81 3967 -2.92 4063 -3.05 4520 -3.44 4824 -3.44 4977 -3.49 5435 -3.51 5682 -4.98 5892 -6.11 6062 -6.65 6349 -6.57 6381 -6.86 9032 -9.19 9410 -9.14 9711 -8.50 9891 -8.22 9976 -7.56 10027 -7.34 10252 -6.55 10432 -6.33 10542 -6.65 10612 -6.98 10662 -7.25 10712 -6.95 10762 -6.81 10812 -6.92 10862 -7.46 10912 -8.77 10962 -9.93 11012 -9.73 11032 -8.63 11140 -7.52 11227 -7.75 11335 -7.42 11466 -6.19 11656 -4.68 11815 -4.10 12024 -4.07 12302 -4.99 12361 -3.84 12581 -4.28 12587 -3.62 12720 -3.56 12790 -4.08 12827 -3.38 13069 -3.89 13146 -2.96 13173 -3.99 13304 -4.87 13385 -4.64 13434 -4.65 13512 -3.53 13617 -3.14 13718 -1.12 13747 -1.00 13903 -1.79 13982 -2.40 14077 -2.50 14112 -1.06 14242 -1.46 14263 -1.36 14347 -1.85 14451 -1.01 14555 -0.91 14595 -1.11 14660 -1.64 14764 -1.68 14842 -1.24 14900 -1.10 14947 -1.19 15148 -1.39 15281 -1.74 15527 -1.99 15752 -2.24