#----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # 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: hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:14490 # Online_Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/liu2011.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: paleolimnology #-------------------- # Contribution_Date # Date: 2013-05-01 #-------------------- # Title # Study_Name: Shanxi Gonghai Lake, North China, Humid Medieval Warm Period #-------------------- # Investigators # Investigators: Liu,J.B.;Chen,F.H.;Chen,J.H.;Xia,D.S.;Xu,Q.H.;Wang,Z.L.;Li,Y.C. #-------------------- # Description_and_Notes # Description: Environmental magnetic record ( χ and S-300) of lacustrine sediments (core GH09B1) from Gonghai Lake, North China. All AMS 14C dates were generated from samples of terrestrial plant macrofossils. The AMS 14C samples were all first prepared with the standard pretreatment (alkali–acid–alkali) and then measured at the AMS Dating Laboratory of the Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China. All dates were calibrated to calendar years using OXCAL4.1 software using the IntCal04 calibration data set. #-------------------- # Publication # Authors: LIU JianBao, CHEN FaHu, CHEN JianHui, XIA DunSheng, XU QingHai, WANG ZongLi & LI YueCong # Published_Date_or_Year: 2011 # Published_Title: Humid Medieval Warm Period recorded by magnetic characteristics of sediments from Gonghai Lake, Shanxi, North China # Journal_Name: Chinese Science Bulletin # Volume: 56 # Edition: # Issue: 23 # Pages: 24642474 # Report_Number: # DOI: 10.1007/s11434-011-4592-y # Publication_Place: # Publisher: # ISBN: # Online_Resource: # Other_Reference_Details: # Full_Citation: # Abstract: Variations in monsoon strength, moisture or precipitation in eastern China during the MWP reflected by different climatic records have shown apparent discrepancies. Here, detailed environmental magnetic investigations and mineralogical analyses were conducted on lacustrine sediments of Core GH09B1 (2.8 m long) from Gonghai Lake, Shanxi, North China, concerning the monsoon history during the MWP. The results demonstrate that the main magnetic mineral is magnetite. The sediments with relatively high magnetic mineral concentrations were characterized by relatively fine magnetic grain sizes, which were formed in a period of relatively strong pedogenesis and high precipitation. In contrast, the sediments with low magnetic mineral concentrations reflected an opposite process. The variations of magnetic parameters in Gonghai Lake sediments were mainly controlled by the degree of pedogenesis in the lake drainage basin, which further indicated the strength of the Asian summer monsoon. The variations in the χ and S-300 parameters of the core clearly reveal the Asian summer monsoon history over the last 1200 years in the study area, suggesting generally abundant precipitation and a strong summer monsoon during the Medieval Warm Period (MWP, AD 910–1220), which is supported by pollen evidence. Furthermore, this 3–6-year resolution environmental magnetic record indicates a dry event around AD 980–1050, interrupting the generally humid MWP. The summer monsoon evolution over the last millennium recorded by magnetic parameters in sediments from Gonghai Lake correlates well with historical documentation (North China) and speleothem oxygen isotopes (Wanxiang Cave), as well as precipitation modeling results (extratropical East Asia), which all indicate a generally humid MWP within which centennial-scale moisture variability existed. It is thus demonstrated that environmental magnetic parameters could be used as an effective proxy for monsoon climate variations in high-resolution lacustrine sediments. #------------------ # Funding_Agency # Funding_Agency_Name: National Basic Research Program of China # Grant: 2010CB950202 #------------------ # Funding_Agency # Funding_Agency_Name: National Natural Science Foundation of China # Grant: 40971056 #------------------ # Funding_Agency # Funding_Agency_Name: National Natural Science Foundation of China # Grant: 41001114 #------------------ # Site_Information # Site_Name: Gonghai Lake # Location: North China # Region: Shanxi # Country: China # Northernmost_Latitude: 38.9 # Southernmost_Latitude: 38.9 # Easternmost_Longitude: 112.233333 # Westernmost_Longitude: 112.233333 # Elevation: 1860 #------------------ # Data_Collection # Collection_Name: GH09B1 # Earliest_Year: 842 # Most_Recent_Year: 2000 # Time_Unit: AD # Core_Length: # Notes: #------------------ # Species: #------------------ # Chronology: # AMS Date: AMS ages for lacustrine sediments (core GH09B1), measured at at the AMS Dating Laboratory of the Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China. # # Sample Depth (m) Age, 14C yr BP* δ13C (‰) Age, Cal yr BP error (1 sigma) Age, AD # GHB1-48 0.63 368±23 -24.92 415 83 1535 # GHB1-89 1.16 665±34 -30.66 617 52 1333 # GHB1-153 1.99 1005±40 -30.87 884 80 1066 # GHB1-191 2.45 1102±30 -30.41 1011 43 939 # # *B.P. stands for Before Present (where the present is defined as the year 1950 A.D.) #---------------- # Variables # Short_name What,Material,Error,Units, Seasonality,Archive,Details,Method,Data_type ## age_AD Age,,,years AD,,,,,,N ## magsus Magnetic susceptibility,,,10-8m3/kg,Paleolimnology,,,N ## s-300 S-300,,,percent,,Paleolimnology,,N #---------------- # Data # Missing_Values: age_AD magsus s-300 2000 34.7 88.7 1985 34.7 88.7 1978 31.1 87.9 1970 39.6 91.0 1955 28.0 86.1 1948 31.6 88.3 1940 32.7 88.7 1933 33.1 87.9 1918 31.8 87.8 1910 32.4 88.4 1903 32.2 88.0 1888 31.1 87.8 1880 32.0 88.3 1873 32.2 88.4 1858 30.7 87.8 1850 31.3 87.3 1843 30.4 86.4 1835 29.8 86.4 1820 29.1 85.7 1813 27.1 85.8 1805 30.2 87.0 1790 28.7 85.5 1783 28.9 85.2 1775 27.8 85.7 1760 28.4 85.4 1753 28.4 85.6 1745 28.4 85.7 1738 30.2 86.3 1723 30.2 86.7 1715 30.2 87.1 1708 29.3 86.1 1693 30.2 86.8 1685 31.8 87.4 1678 30.7 86.6 1663 30.9 86.3 1655 28.4 85.7 1648 28.2 86.3 1640 27.6 84.1 1625 28.0 85.2 1618 29.1 85.0 1610 24.9 84.9 1595 28.0 85.1 1588 28.0 85.1 1580 28.2 85.8 1565 29.3 86.2 1558 31.3 86.0 1550 28.7 85.3 1535 27.8 85.2 1531 27.1 85.9 1527 29.1 85.5 1524 30.2 86.0 1516 29.6 85.4 1512 28.9 85.7 1508 30.4 85.3 1501 29.3 84.9 1497 28.9 84.8 1493 28.0 84.1 1485 28.2 84.1 1482 28.4 84.4 1478 29.3 84.3 1474 28.0 83.9 1466 26.9 83.9 1463 26.4 83.0 1459 25.8 82.8 1451 25.3 81.6 1447 25.3 81.7 1444 25.1 80.9 1436 26.0 80.9 1432 25.1 81.7 1428 26.2 82.2 1424 26.9 82.0 1417 26.2 81.9 1413 27.1 82.2 1409 26.2 81.7 1402 26.0 82.0 1398 25.6 81.4 1394 26.2 81.0 1386 24.9 80.2 1383 25.8 80.6 1379 26.2 80.5 1375 25.3 80.7 1367 25.1 81.7 1363 25.6 81.2 1360 27.3 81.4 1352 26.0 81.2 1348 25.3 81.8 1344 25.8 81.8 1337 26.9 82.1 1333 26.7 82.3 1330 26.0 81.9 1323 26.4 82.6 1320 26.2 82.9 1317 26.7 82.2 1314 26.0 83.1 1307 27.8 83.0 1304 27.6 82.6 1301 27.1 82.8 1294 27.1 83.4 1291 26.0 83.3 1288 27.6 83.8 1282 27.8 83.5 1278 26.4 83.2 1275 26.7 83.3 1272 26.2 83.5 1265 26.9 84.0 1262 27.8 84.2 1259 27.8 83.9 1253 28.4 84.0 1249 28.7 84.5 1246 28.4 84.0 1240 29.8 84.6 1236 28.9 84.5 1233 29.6 85.4 1230 28.9 85.1 1224 29.3 85.6 1220 31.1 86.2 1217 31.1 86.2 1211 31.3 86.5 1208 31.1 87.1 1204 30.2 87.2 1198 31.3 87.3 1195 33.1 87.5 1191 32.0 87.2 1188 30.0 87.3 1182 32.9 87.8 1179 31.6 87.5 1175 31.8 87.8 1169 31.3 87.6 1166 31.6 87.2 1163 30.4 87.5 1156 29.3 87.8 1153 29.1 87.1 1150 29.3 87.9 1143 30.9 88.6 1140 30.7 88.2 1137 30.4 88.3 1134 30.0 88.2 1127 30.4 88.0 1124 31.3 88.4 1121 29.6 88.2 1114 29.1 88.7 1111 29.3 88.2 1108 30.0 88.5 1101 29.1 88.6 1098 30.0 88.5 1095 30.0 88.8 1092 31.8 89.3 1085 30.4 90.2 1082 33.8 90.4 1079 33.6 90.0 1072 35.8 90.5 1069 34.7 91.0 1066 30.0 90.4 1060 31.3 88.6 1058 33.1 88.6 1055 30.2 86.2 1052 28.2 86.4 1047 27.6 85.0 1044 29.8 85.1 1041 29.1 85.8 1036 29.6 85.2 1033 28.0 85.0 1030 29.3 84.9 1025 28.0 84.4 1022 27.3 84.3 1019 26.4 83.5 1016 27.1 84.2 1011 26.4 83.6 1008 26.7 84.3 1005 26.9 85.7 1000 25.8 84.5 997 28.0 86.1 994 28.0 85.4 989 27.6 85.4 986 28.7 86.8 983 26.0 85.4 978 27.8 86.4 975 28.0 85.0 972 27.6 86.7 969 29.1 87.0 964 30.9 88.0 961 30.7 88.3 958 31.6 88.5 953 31.1 89.3 950 31.3 88.7 947 32.0 89.2 942 32.7 89.0 939 32.0 89.5 936 29.3 89.6 933 27.8 87.7 928 27.6 88.0 925 28.2 88.3 922 28.2 88.5 917 26.0 87.0 914 26.4 86.9 911 30.4 88.0 906 24.9 86.3 903 22.0 83.7 900 22.4 84.0 898 22.7 84.4 892 21.1 83.2 889 23.1 85.0 887 25.6 84.8 881 26.9 85.1 878 24.9 84.2 876 24.0 84.2 870 24.9 83.0 867 24.2 82.7 864 21.8 83.6 862 24.2 83.6 856 24.0 88.6 853 23.8 64.8 851 22.7 84.0 845 22.9 83.5 842 23.3 84.7