Lake Masoko, Tanzania 500 Year Geochemical Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: Lake Masoko, Tanzania 500 Year Geochemical Data LAST UPDATE: 3/2008 (Original receipt by WDC Paleo) CONTRIBUTORS: Yannick Garcin, David Williamson, Laurent Bergonzini, Olivier Radakovitch, Annie Vincens, Guillaume Buchet, Joel Guiot, Simon Brewer, Pierre-Etienne Mathe, and Amos Majule. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2008-028 SUGGESTED DATA CITATION: Garcin, Y., et al. 2008. Lake Masoko, Tanzania 500 Year Geochemical Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2008-028. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Garcin, Y., D. Williamson, L. Bergonzini, O. Radakovitch, A. Vincens, G. Buchet, J. Guiot, S. Brewer, P.-E. Mathé, and A. Majule. 2007. Solar and anthropogenic imprints on Lake Masoko (southern Tanzania) during the last 500 years. Journal of Paleolimnology, Vol. 37, pp. 475-490. doi:10.1007/s10933-006-9033-6. ABSTRACT: The Masoko crater-lake in southern Tanzania provides a continuous record of environmental changes covering the last 500 years. Multi-proxy studies were performed on a 52 cm sediment core retrieved from the deepest part of the lake. Magnetic, organic carbon, geochemical proxies and pollen assemblages indicate a dry climate during the 'Little Ice Age' (AD 1550–1850), confirming that the LIA in eastern Africa resulted in marked and synchronous hydrological changes. However, the direction of response varies between different African lakes (low versus high lake-levels), indicating strong regional contrasts that prevent the clear identification of climate trends over eastern Africa at this time. Inferred changes in Masoko lake-levels closely resemble the record of solar activity cycles, indicating a possible control of solar activity on the climate in this area. This observation supports previous results from East African lakes, and extends this relationship southward. Finally, anthropogenic impact is observed in the Masoko sediments during the last 60 years, suggesting that human disturbance significantly affected this remote basin during colonial and post-colonial times. GEOGRAPHIC REGION: East Africa PERIOD OF RECORD: 1511 - 2002 AD FUNDING SOURCES: Projects CLEHA-ECLIPSE-INSU, RESOLVE (French Ministry of Research) and ARTEMIS from France DESCRIPTION: The multiproxy study performed on Lake Masoko, Tanzania (9º20.0'S, 33º45.3'E, 840 m elevation, 38 m depth) core MKJ-03-II shows several marked changes in the sedimentary content, which are interpreted in term of lake-level, climatic changes and anthropogenic disturbances. Pollen data from this study are stored in the African Pollen Database (http://medias.obs-mip.fr/apd/). DATA: Garcin et al. 2007 Lake Masoko, Tanzania 500 Year Geochemical Data Lake Masoko, Tanzania 500 Year Geochemical Data Column 1: Depth (cm) Column 2: Age (yr AD) Column 3: Low-field magnetic susceptibility (m3.kg-1) Column 4: Si/Ti Column 5: Al/Ti Column 6: Nb/Ti Column 7: Fe/Ti Column 8: Loss on ignition (%) Column 9: Ntotal Column 10: Ctotal (%) Column 11: C/N Depth Year MagSus Si/Ti Al/Ti Nb/Ti Fe/Ti LOI Ntotal Ctotal C/N 0.25 2002 0.000006725 14.95 5.23 0.0094 4.03 27.9 0.75 2001 0.000006731 1.25 2000 0.000006946 16.62 5.77 0.0143 4.49 27.6 1.05 9.71 9.25 1.75 1998 0.000006936 14.87 4.88 0.0129 3.99 27.3 2.25 1997 0.000006894 15.24 5.01 0.0123 4.15 27.2 0.99 9.61 9.75 2.75 1995 0.000006814 15.62 5.16 0.0125 4.12 27.6 3.25 1994 0.000006859 14.31 4.69 0.0108 3.7 27.8 1.01 9.78 9.63 3.75 1992 0.000006879 16.12 5.28 0.0145 4.14 27.7 4.25 1990 0.000007013 14.41 4.75 0.0094 3.81 27.7 0.97 9.29 9.54 4.75 1988 0.000006962 14.97 4.95 0.0125 4.05 27.8 5.25 1987 14.24 4.71 0.0122 3.69 27.1 0.85 8.87 10.39 5.75 1985 0.000007029 14.64 4.83 0.0117 3.81 27.1 6.25 1983 0.000006926 14.07 4.67 0.013 3.64 26.9 0.86 8.91 10.38 6.75 1980 0.000007125 14.81 4.98 0.0137 3.83 26.3 7.25 1978 0.000007146 14.81 4.95 0.0125 3.89 26.1 7.75 1976 0.000007114 15.22 5.02 0.0134 4.01 26 0.82 8.76 10.72 8.25 1974 0.000007067 14.61 4.81 0.0126 3.76 26 8.75 1971 0.000007217 14.27 4.73 0.0115 3.65 25.9 0.77 8.65 11.21 9.25 1969 0.000006976 15.6 5.17 0.0136 4.06 26.1 9.75 1966 0.00000695 15.5 5.09 0.013 4.03 25.7 10.25 1964 0.000006795 15.04 4.87 0.0138 3.88 25.7 0.75 8.84 11.75 10.75 1961 0.000006742 15.27 4.98 0.014 3.77 25.4 11.25 1958 0.000006544 15.4 5.03 0.0148 3.8 25.8 11.75 1955 0.000006681 14.9 4.83 0.0142 3.71 25.5 0.76 8.65 11.35 12.25 1953 0.000006519 16.96 5.51 0.0156 4.19 25.4 12.75 1950 0.000006468 15.28 5.02 0.0122 3.78 25.4 13.25 1947 0.00000619 15.76 5.1 0.0139 3.83 26 0.73 8.69 11.86 13.75 1944 0.00000636 15.4 5.01 0.0139 3.69 25.1 14.25 1940 0.000006405 14.87 4.91 0.0136 3.53 24.4 0.72 8.23 11.45 14.75 1937 0.000006468 15.99 5.31 0.0146 3.8 23.5 15.25 1934 0.000006426 15.86 5.28 0.016 3.75 23.4 0.67 7.91 11.83 15.75 1930 0.000006437 16.25 1927 0.000006424 15.26 5.14 0.0141 3.51 23.3 0.67 7.73 11.59 16.75 1923 0.000006457 17.25 1920 0.000006655 15.13 5.03 0.0135 3.56 22.5 0.6 7.39 12.27 17.75 1916 0.000006509 18.25 1912 0.000006673 15.1 5.11 0.0142 3.5 22.1 0.59 6.73 11.45 18.75 1909 0.000006234 19.25 1905 0.00000646 15.02 5.06 0.0135 3.41 22.5 0.6 6.95 11.49 19.75 1901 0.000006563 20.25 1897 0.000006956 15.19 5.01 0.0139 3.55 23.7 0.69 8.07 11.68 20.75 1893 0.000007123 21.25 1889 0.000006957 14.9 4.9 0.0127 3.5 23.6 0.69 8.03 11.58 21.75 1884 0.000007166 22.25 1880 0.000007386 15.44 5.03 0.0141 3.53 24.1 0.67 7.9 11.88 22.75 1876 0.000007374 23.25 1871 0.000007459 15.56 4.98 0.0138 3.54 24 0.65 7.94 12.17 23.75 1867 0.000007843 24.25 1862 0.000007819 15.08 4.94 0.0136 3.61 23.6 0.63 7.49 11.8 24.75 1858 0.000007972 25.25 1853 0.000007672 15.49 5.03 0.0137 3.7 23.8 0.64 7.62 11.86 25.75 1848 0.000007888 26.25 1843 0.000007996 15.57 5.08 0.015 3.69 23.9 0.65 7.97 12.35 26.75 1838 0.000007748 27.25 1833 0.00000808 15.65 5.13 0.0151 3.73 23.8 0.62 7.28 11.75 27.75 1828 0.000008067 28.25 1823 0.000008129 15.44 5.13 0.0166 3.71 23.8 0.62 7.63 12.3 28.75 1818 0.00000824 29.25 1813 0.000008314 14.39 4.73 0.0155 3.4 23.4 0.59 7.39 12.52 29.75 1807 0.000008008 30.25 1802 0.000007434 14.23 4.65 0.014 3.3 23.2 0.59 7.58 12.78 30.75 1796 0.000007662 31.25 1791 0.000007773 15.74 5.03 0.0161 3.56 23 0.59 7.67 12.99 31.75 1785 0.000007627 32.25 1779 0.000007662 15.56 4.89 0.0153 3.53 23.1 0.67 7.85 11.72 32.75 1774 0.000007699 33.25 1768 0.000007944 14.96 4.76 0.013 3.47 23.3 0.61 7.85 12.94 33.75 1762 0.000007839 34.25 1756 0.0000077 34.75 1750 0.000007695 35.25 1744 0.00000783 16.01 4.8 0.015 3.76 23.4 0.6 7.97 13.25 35.75 1738 0.00000816 36.25 1731 0.000008556 16.38 4.91 0.0141 3.86 22.2 0.53 7.09 13.28 36.75 1725 0.000008832 37.25 1719 0.000009134 15.72 4.89 0.0139 3.69 20.8 0.46 6.2 13.46 37.75 1712 0.000009208 38.25 1706 0.000009321 16.06 5.06 0.0158 3.76 19.7 0.41 5.54 13.55 38.75 1699 0.000009586 39.25 1692 0.000009712 15.95 4.98 0.0168 3.65 19.2 0.37 4.96 13.39 39.75 1685 0.000009434 40.25 1679 0.000008753 18 5.37 0.0185 3.79 17.8 0.36 4.6 12.94 40.75 1672 0.000009199 41.25 1665 0.000009819 15.77 5.24 0.0179 3.82 19.8 0.41 4.95 12.09 41.75 1658 0.000009988 42.25 1651 0.000009629 16.98 5.66 0.0185 4.12 20 0.41 5.19 12.78 42.75 1643 0.000009469 43.25 1636 0.000009016 15.37 4.79 0.0166 3.48 20.6 0.41 5.35 13.04 43.75 1629 0.00000875 44.25 1621 0.000008456 14.61 4.83 0.0103 3.4 20.9 0.46 5.65 12.35 44.75 1614 0.000008046 45.25 1606 0.000007482 15.5 4.81 0.0164 3.42 21.2 0.47 6 12.87 45.75 1599 0.000007501 46.25 1591 0.000007814 14.09 4.42 0.0157 3.32 21.7 0.51 6.28 12.35 46.75 1583 0.000008081 47.25 1576 0.0000084 15.03 4.62 0.013 3.94 21.8 0.48 6.49 13.46 47.75 1568 0.000009243 48.25 1560 0.000009716 16.46 4.97 0.0162 4.19 20 0.37 5.17 13.85 48.75 1552 0.00000917 49.25 1544 0.000009123 18.34 5.21 0.0184 3.74 19.4 0.38 4.71 12.51 50.25 1527 0.000009052 17.72 5.19 0.0161 4.27 20.3 0.35 4.86 13.71 50.75 1519 0.0000091 51.25 1511 0.000009103 19.17 5.6 0.0203 4.23 20.2 0.46 6.14 13.36