# 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/van2008d18o.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: Lake Van data and ages have been digitised (i.e. not original data) # Note: original age based on varve counts. Adjusted age (preferred) follows Litt et al., 2009, Quaternary Science Reviews doi:10.1016/j.quascirev.2009.03.002. # #-------------------- # 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: Lucia Wick, Genry Lemcke, Michael Sturm # Published_Date_or_Year: 2003-07-01 # Published_Title: Evidence of Lateglacial and Holocene climatic change and human impact in eastern Anatolia: high-resolution pollen, charcoal, isotopic and geochemical records from the laminated sediments of Lake Van, Turkey # Journal_Name: The Holocene # Volume: 13 # Edition: # Issue: 5 # Pages: 665-675 # Report_Number: # DOI: # Online_Resource: http://journals.sagepub.com/doi/abs/10.1191/0959683603hl653rp # Full_Citation: # Abstract: Annually laminated sediments from Lake Van, spanning about 13000 varve years, were sampled for stable-isotopic, geochemical, pollen and charcoal analyses in order to find evidence of past regional climatic changes and human impact in the semi-arid region of eastern Anatolia, Turkey. The Lateglacial period was cold and dry, with steppe vegetation and saline lake water. During the Younger Dryas the lake level dropped dramatically, and the vegetation turned to a semi-desert. Geochemical and isotopic records indicate a strong increase in moisture at the onset of the Holocene, and Arteinisia-chenopod steppes were partly replaced by grass steppe and pistachio scrub. A delay of about 3000 years in the expansion of deciduous oak woodlands and high steppe-fire frequencies suggest dry spring and summer weather during the early Holocene. At 8200 yr BP, a shift in the regional climate regime facilitated the transport of more moisture into the interior areas of the Taurus mountains and caused a change in the seasonal distribution of precipitation. The steppe-forests dominated by Quercus advanced and reached their maximum extention at about 6200 yr BP. All the proxy data indicate optimum climatic conditions, low water salinity and high lake level between 6200 and 4000 yr BP. After 4000 yr BP, aridity increased again and the modern climatic situation was established. Human impact in the catchment of Lake Van started at 3800 yr BP and was intensified during the last 600 years. #------------------ # Funding_Agency # Funding_Agency_Name: # Grant: #------------------ # Site_Information # Site_Name: Lake Van # Location: Asia>Western Asia>Turkey # Country: Turkey # Northernmost_Latitude: 38.63 # Southernmost_Latitude: 38.63 # Easternmost_Longitude: 42.8167 # Westernmost_Longitude: 42.8167 # Elevation: 1648 m #------------------ # Data_Collection # Collection_Name: Van2008d18O # Earliest_Year: 16128 # Most_Recent_Year: 56 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: Note: original age based on varve counts. Adjusted age (preferred) follows Litt et al., 2009, Quaternary Science Reviews doi:10.1016/j.quascirev.2009.03.002. # #---------------- # 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_orig age, , , calendar years before present, , , original, ,N, ## age_adj age, , , calendar years before present, , , adjusted, ,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_orig age_adj d18O 50 56 0.80 100 112 0.60 200 224 0.53 300 336 0.33 400 448 0.53 500 560 0.97 600 672 0.87 700 784 0.43 800 896 0.07 900 1008 0.10 1000 1120 0.57 1100 1232 0.87 1200 1344 1.00 1300 1456 1.07 1400 1568 0.53 1600 1792 1.07 1700 1904 1.37 1900 2128 1.27 2000 2240 1.47 2100 2352 1.70 2250 2520 1.97 2400 2688 1.73 2500 2800 1.70 2600 2912 1.30 2700 3024 1.53 2800 3136 0.87 2900 3248 1.60 3000 3360 1.40 3100 3472 1.80 3200 3584 1.47 3300 3696 1.03 3400 3808 0.57 3500 3920 0.40 3600 4032 0.63 3700 4144 0.83 3800 4256 1.00 3900 4368 0.27 4000 4480 0.33 4100 4592 0.07 4200 4704 0.47 4300 4816 0.37 4400 4928 -0.23 4500 5040 -0.30 4600 5152 -0.57 4700 5264 -0.13 4800 5376 -0.43 4900 5488 -0.13 5000 5600 -0.13 5100 5712 0.27 5200 5824 0.00 5300 5936 0.33 5400 6048 0.30 5500 6160 0.50 5600 6272 0.33 5800 6496 0.47 5900 6608 0.43 6000 6720 0.40 6100 6832 0.03 6200 6944 -0.23 6300 7056 -0.13 6400 7168 0.10 6500 7280 -0.07 6600 7392 -0.43 6700 7504 -0.23 6800 7616 0.43 6900 7728 0.60 7000 7840 0.47 7100 7952 0.07 7200 8064 0.07 7300 8176 0.07 7400 8288 0.10 7500 8400 0.23 7650 8568 0.20 7700 8624 0.07 7800 8736 0.33 7900 8848 0.57 8000 8960 0.87 8100 9072 0.53 8300 9296 0.33 8400 9408 0.67 8800 9856 1.27 8900 9968 1.50 9000 10080 1.30 9100 10192 0.90 9200 10304 0.90 9300 10416 0.90 9400 10528 1.17 9600 10752 1.00 9800 10976 0.70 9950 11144 0.50 10100 11312 0.50 10200 11424 1.27 10400 11648 2.87 10600 11872 3.90 10800 12096 4.40 11000 12320 3.60 11200 12544 3.43 11400 12768 2.90 11600 12992 2.63 11800 13216 2.23 12000 13440 1.77 12200 13664 1.20 12400 13888 0.37 12600 14112 0.30 12800 14336 0.87 13000 14560 1.37 13200 14784 1.53 13400 15008 0.87 13600 15232 0.60 13800 15456 0.23 14000 15680 0.30 14200 15904 0.57 14400 16128 0.70