East China Sea High-Resolution Grain Size Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: East China Sea High-Resolution Grain Size Data LAST UPDATE: 4/2005 (Original receipt by WDC Paleo) CONTRIBUTOR: Shangbin Xiao IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2005-033 SUGGESTED DATA CITATION: Xiao, S., et al. 2005. East China Sea High-Resolution Grain Size Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2005-033. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCES: Xiao, S., A. Li, F. Jiang, T. Li, P. Huang, and Z. Xu. 2005. Recent 2000-year geological records of mud in the inner shelf of the East China Sea and their climatic implications. Chinese Sciences Bulletin 50(5), 466-471. Xiao, S. and A. Li. 2005. A study on environmental grain-size population in inner shelf of the East China Sea. Acta sedimentologica sinica. 34(1): 27-34. (in Chinese with English abstract) ABSTRACT: AMS14C dating and grain-size analysis for Core DD2, located at the north of the Yangtze River-derived mud off the Zhejiang-Fujian coasts in the inner shelf of the East China Sea, provide us a high-resolution grain-size distribution curve varying with depth and time. Data in the upper mud layer of Core DD2 indicate that there are at least 9 abrupt grain-size increasing in recent 2000 years, with each corresponding very well with the low-temperature events in Chinese history, which might result from the periodical strengthening of the East Asian Winter Monsoon (EAWM), including the first-revealed maximum temperature lowering event at around 990 a BP. At the same time, the finer grain size section in Core DD2 agrees well with the Sui-Tang Warming Period (600-1000 a AD) defined previously by Zhu Kezhen, during which the climate had a warm, cold and warm fluctuation, with a dominated cooling period of 750-850 a AD. The Little Ice Age (LIA) can also be identified in the core. It starts around 1450 a AD and was followed by a subsequent cooling events at 1510, 1670 and 1840 a AD. Timing of these cold events revealed here still needs to be further verified owing to some current uncertainty of dating we used in this study. GEOGRAPHIC REGION: East China Sea PERIOD OF RECORD: 1600 YrBP - present DESCRIPTION: Core DD2, located at the north of the Yangtze River-derived mud off the Zhejiang-Fujian coasts in the inner shelf of the East China Sea, provides us a high-resolution grain-size distribution curve varying with depth and time. Core DD2 indicates that there are at least 9 abrupt grain-size increases in the past 2000 years, with each corresponding very well with the low-temperature events in Chinese history, which might result from the periodical strengthening of the East Asian Winter Monsoon. Core DD2: 29 deg. 34.92' N, 122 deg., 37.92' E, 43.5m water depth. DATA: 1. Grain size data Column 1: Depth Column 2: Age, Years Before Present Column 3: Mean grain-size of fine population (<45um)/um Column 4: Mean grain-size of bulk sample/um Depth AgeBP GS-fine GS-bulk 1 -43.22 7.22 7.55 3 -29.67 7.85 8.24 5 -16.12 7.92 8.21 7 -2.57 8.15 8.66 9 10.98 8.39 9.04 11 24.53 7.22 7.54 13 38.08 7.48 7.93 15 51.63 7.93 8.64 17 65.18 8.36 8.94 19 78.73 7.35 7.65 21 92.29 8.16 8.69 23 105.84 8.86 9.49 25 119.39 8.59 9.18 27 132.94 8.44 8.93 29 146.49 8.53 9.01 31 160.04 8.25 8.59 33 173.59 7.88 8.27 35 187.14 8.12 8.64 37 200.69 7.52 7.82 39 214.24 7.29 7.52 41 227.8 8.2 8.62 43 241.35 8.28 8.62 45 254.9 8.11 8.55 47 268.45 9.3 10.33 49 282 9.34 10.17 51 304.3 8.99 9.67 53 326.6 7.86 8.23 55 348.9 8.8 9.35 57 371.2 8.99 9.59 59 393.5 8.65 9.27 61 415.8 8.99 9.72 63 438.1 8.94 9.72 65 460.4 8.48 9.23 67 482.7 8.72 9.54 69 505 8.32 8.6 71 527.3 7.81 8.03 73 549.6 7.74 8.05 75 571.9 7.43 7.65 77 594.2 7.64 7.88 79 616.5 7.48 7.77 81 638.8 7.94 8.24 83 661.1 7.95 8.3 85 683.4 9.49 10.17 87 705.7 8.9 9.48 89 728 8.22 8.57 91 750.3 9.1 9.57 93 772.6 8.05 8.39 95 794.9 8.14 8.49 97 817.2 8.2 8.54 99 839.5 7.84 8.15 101 861.8 8.32 8.73 103 884.1 9.8 10.44 105 906.4 8.29 8.54 107 928.7 10.34 11.63 109 951 10.49 11.28 111 963.26 9.07 9.61 113 975.51 7.48 7.76 115 987.77 7.18 7.37 117 1000.02 7.39 7.7 119 1012.28 6.89 7.19 121 1024.53 7.42 7.62 123 1036.79 7.02 7.23 125 1049.04 6.43 6.58 127 1061.3 7.07 7.27 129 1073.55 7.88 8.25 131 1085.81 8.08 8.49 133 1098.06 7.94 8.36 135 1110.32 7.51 7.87 137 1122.57 7.82 8.05 139 1134.83 7.21 7.39 141 1147.09 6.2 6.31 143 1159.34 6.81 6.96 145 1171.6 7.51 7.78 147 1183.85 6.62 6.73 149 1196.11 6.97 7.1 151 1208.36 6.86 6.97 153 1220.62 7.6 7.82 155 1232.87 7.27 7.51 157 1245.13 7.18 7.37 159 1257.38 6.86 7.06 161 1269.64 7.86 8.08 163 1281.89 8 8.32 165 1294.15 7.72 7.96 167 1306.4 7.7 7.87 169 1318.66 7.44 7.7 171 1330.91 8.33 8.67 173 1343.17 8.24 8.47 175 1355.43 8 8.29 177 1367.68 8.97 9.36 179 1379.94 8.05 8.28 181 1392.19 8.03 8.29 183 1404.45 8.51 8.77 185 1416.7 7.85 8.12 187 1428.96 7.76 8.19 189 1441.21 7.63 7.88 191 1453.47 8.22 8.56 193 1465.72 7.81 8.13 195 1477.98 8.45 8.8 197 1490.23 8.64 9.01 199 1502.49 8.69 9.13 201 1514.74 9.18 9.81 203 1527 8.12 13.34 205 1539.26 8.83 13.34 207 1551.51 9.06 10.68 209 1563.77 8.98 10.68 211 1576.02 9.05 10.08 213 1588.28 9.02 10.05 215 1600.53 9.63 10.81 217 1612.79 8.58 12.62