# Nir'pa Co, Tibet 3,300 Year Geochemical and Physical Properties Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 2.0 # 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/20368 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/nirpaco2017xrf.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleolimnology # # Parameter_Keywords: geochemistry, physical properties, magnetic susceptibility, mineralogy #-------------------- # Contribution_Date # Date: 2016-10-18 #-------------------- # Title # Study_Name: Nir'pa Co, Tibet 3,300 Year Geochemical and Physical Properties Data #-------------------- # Investigators # Investigators: Bird, B.W.; Lei, Y.; Perello, M.; Polissar, P.J.; Yao, T.; Finney, B.; Bain, D.; Pompeani, D.; Thompson, L.G. #-------------------- # Description_and_Notes # Description: Sediment geochemical data from two cores collected in Nir'pa Co, Tibet for the past 3,300 years. Measured parameters include: # Dry bulk density, Total organic matter, Biogenic Opal, C-N, d13C, d15N, clay/silt/sand, Magnetic susceptibility, and XRF mineralogy. # # Provided Keywords: Third Pole Environment, Paleoclimate, Sedimentology, Medieval Climate Anomaly, Little Ice Age, Hydroclimate, Pluvial, Drought #-------------------- # Publication # Authors: Broxton W. Bird, Yanbin Lei, Melanie Perello, Pratigya J. Polissar, Tandong Yao, Bruce Finney, Daniel Bain, David Pompeani and Lonnie G. Thompson # Published_Date_or_Year: 2016-09-28 # Published_Title: Late-Holocene Indian summer monsoon variability revealed from a 3300-year-long lake sediment record from Nir'pa Co, southeastern Tibet # Journal_Name: The Holocene # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1177/0959683616670220 # Online_Resource: http://hol.sagepub.com/content/early/2016/09/27/0959683616670220.abstract # Full_Citation: # Abstract: Sedimentological and geochemical results from Nir'pa Co, an alpine lake on the southeastern Tibetan Plateau, detail late-Holocene Indian summer monsoon (ISM) hydroclimate during the last 3300 years. Constrained by modern calibration, elevated silt and lithics and low sand and clay between 3.3 and 2.4 ka and 1.3 ka and the present indicate two pluvial phases with lake levels near their current overflow elevation. Between 2.4 and 1.3 ka, a sharp increase in sand and corresponding decrease in lithics and silt suggest drier conditions and lower lake levels at Nir'pa Co. Hydroclimate expressions in the sedimentological proxies during the Medieval Climate Anomaly (MCA) and 'Little Ice Age’ (LIA) are not statistically significant, suggesting that these events were minor compared to the millennial scale variability on which they were superimposed. However, decreasing sand and increasing lithics and silt during the MCA between 950 and 800 cal. yr BP may suggest briefly wetter conditions, while increasing sand and reduced lithics and silt from 500 to 200 cal. yr BP suggest potentially drier conditions during the LIA. Similarities with regional records from lake sediment and ice cores and speleothem records from the central and eastern Tibetan Plateau, India, and the Arabian Sea, suggest generally coherent late-Holocene ISM variability in these regions. Increased late-Holocene ISM intensity occurred during times when Tibetan Plateau surface air temperatures were warmer, Indo-Pacific sea surface temperatures were elevated, and the tropical Pacific was in a La Niña-like mean state. Conversely, aridity between 2.4 and 1.3 ka occurred in concert with cooling on the Tibetan Plateau and in the Indo-Pacific with more El Niño-like conditions in the tropical Pacific. Differences with western Tibetan records may reflect a weakened ISM and stronger westerlies in this region during the late-Holocene. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: EAR 1405072, EAR 1023547 #------------------ # Funding_Agency # Funding_Agency_Name: National Natural Science Foundation of China # Grant: 41150110153 #------------------ # Site_Information # Site_Name: Nir'pa Co # Location: Asia>Eastern Asia>China # Country: China # Northernmost_Latitude: 29.734 # Southernmost_Latitude: 29.734 # Easternmost_Longitude: 92.386 # Westernmost_Longitude: 92.386 # Elevation: 4775 m #------------------ # Data_Collection # Collection_Name: NirpaCo2017XRF # Earliest_Year: 3338 # Most_Recent_Year: 128 # Time_Unit: Cal. Year BP # Core_Length: 0.90 m # Notes: #------------------ # Chronology_Information # Chronology: # # 210Pb data # # core Core sampled # depth_top Depth top of sample interval (cm) # depth_bottom Depth bottom of sample interval (cm) # 210Pb_act 210Pb activity (Bq/g) # 210Pb_act_err 210Pb activity error ± (Bq/g) # sup_210Pb_act Supported 210Pb activity (Bq/g) # sup_210Pb_act_err Supported 210Pb activity error ± (Bq/g) # ex_210Pb_act Excess 210Pb activity (Bq/g) # ex_210Pb_act_err Excess 210Pb activity error ± (Bq/g) # 137Cs_act 137Cs activity (Bq/g) # 137Cs_act_err 137Cs activity error ± (Bq/g) # cal_yr_BP Calibrated age, 1-sigmayears before 1950 AD # cal_yr_BP_err Calibrated age, 1-sigmaerror ± # # core depth_top depth_bottom 210Pb_act 210Pb_act_err sup_210Pb_act sup_210Pb_act_err ex_210Pb_act ex_210Pb_act_err 137Cs_act 137Cs_act_err cal_yr_BP cal_yr_BP_err # A-11 0 0.5 0.64 0.077 0.113 0.014 0.527 0.063