# 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/iran/zeribar2008d18o.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. # #-------------------- # 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: Stevens, L.R., Wright Jr., H.E., Ito, E. # Published_Date_or_Year: 2001-09-01 # Published_Title: Proposed changes in seasonality of climate during the Lateglacial and Holocene at Lake Zeribar, Iran # Journal_Name: The Holocene # Volume: 11 # Edition: # Issue: 6 # Pages: 747-755 # Report_Number: # DOI: # Online_Resource: http://journals.sagepub.com/doi/abs/10.1191/09596830195762 # Full_Citation: # Abstract: Calcareous sediments spanning the last 13 ka from Lake Zeribar, western Iran, were sampled for stable-isotope analysis as a means of augmenting earlier climatic interpretations based on pollen and macrofossils. The Lateglacial period was cold and dry, supporting semi-desert vegetation and highly concentrated lake water. Low evaporation rates due to the cold resulted in long residence times and high lake stands. Durinig the early Holocene, the upland vegetation changed to a pistachio-oak savanna as low temperatures and aridity ameliorated. Lake level dropped in response to increased evapotranspiration. The low oxygen-isotope values of lacustrine calcite during this period are interpreted as a relative increase in the contributioni of winiter moisture rather than overall changes in effective moisture. A gradual increase in oak pollen at ~7 ka BP signalled the increase in effective moisture to levels similar to those of today. At the same time the d18O values increased. reflecting a greater percentage of 18O-enriched spring rains. Modern values and seasonal distribution of precipitation were established by 6 ka BP. A short-lived return to winter-only precipitation occurred at ~4.5 ka BP and resulted in a temporary increase in aridity. The covariance among d13C, carbonate deposition and d18O values suggests that lake productivity is linked to these seasonal climatic changes. #------------------ # Funding_Agency # Funding_Agency_Name: # Grant: #------------------ # Site_Information # Site_Name: Lake Zeribar # Location: Asia>Southcentral Asia>Iran # Country: Iran # Northernmost_Latitude: 35.53 # Southernmost_Latitude: 35.53 # Easternmost_Longitude: 46.1167 # Westernmost_Longitude: 46.1167 # Elevation: 1300 m #------------------ # Data_Collection # Collection_Name: Zeribar2008d18O # Earliest_Year: 20746 # Most_Recent_Year: 108 # 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) # ## depth_m depth, , , m, , , , ,N, ## 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: # depth_m age_calBP d18O 5.10 108 -3.05 5.20 216 -3.11 5.40 433 -3.07 5.50 541 -2.99 5.60 649 -3.08 5.70 757 -3.34 5.80 866 -3.65 5.90 974 -3.68 5.99 1071 -3.47 6.01 1093 -4.05 6.10 1190 -3.89 6.20 1298 -4.39 6.30 1407 -4.20 6.40 1515 -4.38 6.50 1623 -4.15 6.60 1731 -4.31 6.70 1839 -4.12 6.90 2056 -4.05 7.02 2186 -3.95 7.10 2293 -4.20 7.20 2442 -4.53 7.30 2591 -4.29 7.40 2740 -4.15 7.50 2889 -4.20 7.60 3039 -4.55 7.70 3188 -5.22 7.80 3337 -5.52 7.90 3486 -5.40 8.10 3785 -5.18 8.30 4083 -4.41 8.70 4680 -4.43 8.90 4978 -4.32 9.00 5127 -4.39 9.02 5157 -4.01 9.10 5277 -3.61 9.20 5426 -3.74 9.30 5575 -3.92 9.40 5724 -3.84 9.54 5933 -3.49 10.03 6513 -3.40 10.53 6817 -4.79 10.60 6859 -5.98 10.90 7041 -6.53 11.12 7172 -6.48 11.84 7609 -6.30 12.53 8028 -6.67 12.73 8149 -6.01 13.01 8322 -7.18 13.11 8380 -7.15 13.51 8626 -7.92 14.02 8932 -6.79 14.22 9127 -6.59 14.61 9749 -5.94 14.74 9957 -5.58 15.01 10388 -5.46 15.27 10803 -5.23 15.51 11186 -4.97 15.73 11537 -4.49 16.04 12031 -4.21 16.23 12335 -2.97 16.51 12774 -2.40 17.01 13580 -2.30 17.20 13883 -3.71 17.32 14074 -4.60 17.60 14521 -4.32 18.02 15184 -3.25 18.55 16037 -1.84 18.60 16117 -1.40 19.02 16780 -0.76 19.50 17554 -1.74 20.00 18352 -1.86 20.40 18990 -2.66 20.94 19852 -2.82 21.50 20746 -3.05