Drought Area Index Reconstruction ----------------------------------------------------------------------- World Data Center for Paleoclimatology ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCES WHEN USING THIS DATA!!!!! CONTRIBUTORS: Cook, E.R., Meko, D.M. and Stockton, C.W.. NAME OF DATA SET: U.S. Drought Area Index Reconstruction IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 1998-036 SUGGESTED DATA CITATION: Cook, E.R., Meko, D.M. and Stockton, C.W., 1998, U.S. Drought Area Index Reconstruction. International Tree-Ring Data Bank. IGBP PAGES/World Data Center-A for Paleoclimatology Data Contribution Series #98-036. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Cook, E.R., Meko, D.M. and Stockton, C.W., 1997. A new assessment of possible solar and lunar forcing of the bi-decadal drought rhythm in the western United States. Journal of Climate 10:1343-1356. ADDITIONAL REFERENCE: Cook, E.R., Meko, D.M., Stahle, D.W. and Cleaveland, M.K. 1996. Tree-ring reconstructions of past drought across the coterminous United States: tests of a regression method and calibration/verification results. In Dean, J.S., Meko, D.M. and Swetnam, T.W., eds., Tree Rings, Environment, and Humanity. Radiocarbon, Tucson. 155-169. LAST UPDATE: 10/98 (Original receipt by WDC-A Paleo) GEOGRAPHIC REGION: Western United States PERIOD OF RECORD: 1700 - 1978 AD DESCRIPTION: Drought(-) or Wetness(+) Area Index, defined as the the number of gridpoints (out of 154) that exceed PDSI thresholds, as defined in the Original Reference, for a given year. DATA: YEAR -0 +0 -1 +1 -2 +2 -3 +3 1700 77 76 20 41 2 16 0 8 1701 30 124 7 59 2 15 0 5 1702 57 97 10 56 0 41 0 17 1703 120 34 65 16 18 5 8 2 1704 131 23 76 10 19 3 0 1 1705 80 74 40 30 4 9 1 0 1706 89 65 35 22 9 4 2 1 1707 87 67 43 31 14 13 8 1 1708 149 5 115 0 39 0 10 0 1709 106 48 42 20 12 9 3 0 1710 79 75 11 22 2 4 0 0 1711 55 99 16 40 2 5 0 0 1712 79 75 24 21 7 5 1 3 1713 74 80 9 33 1 9 0 1 1714 84 70 34 28 11 9 0 2 1715 88 66 40 30 9 19 0 9 1716 67 87 25 36 11 9 2 3 1717 104 50 69 13 37 2 13 0 1718 99 55 60 25 34 11 22 8 1719 74 80 26 36 3 14 0 2 1720 61 93 22 54 4 25 0 15 1721 91 63 59 35 34 18 17 7 1722 108 46 37 22 8 10 2 5 1723 69 85 21 45 0 12 0 4 1724 90 64 40 17 3 1 0 1 1725 68 86 18 37 2 10 0 1 1726 40 114 5 66 0 35 0 24 1727 50 104 12 64 0 42 0 27 1728 99 55 49 27 21 15 1 8 1729 75 79 54 36 42 14 30 8 1730 91 63 49 26 21 10 6 0 1731 93 61 36 20 4 2 0 0 1732 43 111 9 52 0 12 0 2 1733 76 78 33 35 15 15 4 5 1734 84 70 24 25 1 7 0 1 1735 131 23 79 12 43 7 22 4 1736 122 32 88 10 49 4 20 0 1737 94 60 53 28 18 14 2 9 1738 75 79 24 41 4 16 1 3 1739 88 66 48 15 24 2 9 0 1740 88 66 22 38 2 18 0 9 1741 112 42 60 11 17 4 3 1 1742 119 35 65 15 13 2 0 0 1743 87 67 51 23 9 2 1 0 1744 97 57 53 13 18 1 8 0 1745 41 113 4 73 0 28 0 7 1746 45 109 22 86 3 55 0 27 1747 32 122 7 72 0 38 0 19 1748 119 35 73 10 34 3 15 0 1749 73 81 25 39 3 17 0 5 1750 54 99 18 48 3 16 0 13 1751 66 88 15 22 3 3 0 0 1752 115 39 75 9 31 5 9 0 1753 102 52 49 16 11 2 2 0 1754 73 80 18 30 5 11 2 1 1755 101 52 41 16 6 4 0 2 1756 118 36 80 16 48 3 27 0 1757 137 17 97 5 46 0 6 0 1758 77 77 25 40 10 14 5 3 1759 82 72 43 24 9 6 1 1 1760 78 76 31 35 10 8 2 0 1761 30 124 4 80 0 36 0 15 1762 78 76 28 40 0 13 0 3 1763 95 59 38 15 6 3 1 1 1764 67 87 31 36 7 7 0 2 1765 110 44 49 8 19 2 7 0 1766 45 109 15 67 1 21 0 3 1767 73 81 39 44 16 19 3 11 1768 30 124 6 61 1 12 0 2 1769 70 84 19 33 6 6 1 1 1770 108 46 26 8 2 0 0 0 1771 57 97 13 54 0 23 0 6 1772 109 45 68 13 26 3 9 0 1773 115 38 60 19 29 8 13 1 1774 97 57 41 15 10 1 1 0 1775 48 106 9 41 1 26 0 12 1776 63 90 28 54 13 12 4 2 1777 78 76 45 30 13 11 9 5 1778 97 57 50 28 7 17 3 10 1779 62 92 17 35 2 9 0 2 1780 101 53 49 15 13 5 4 0 1781 67 87 35 47 8 12 0 0 1782 85 69 53 33 34 11 16 1 1783 85 69 48 19 19 3 11 0 1784 81 73 31 42 4 17 0 5 1785 93 61 52 21 9 12 0 5 1786 92 62 39 12 14 0 5 0 1787 37 117 5 38 2 8 0 1 1788 72 82 29 33 8 9 2 0 1789 101 53 64 23 40 10 18 3 1790 102 52 39 19 12 8 2 0 1791 84 70 38 33 13 15 0 3 1792 61 93 18 54 0 33 0 10 1793 42 112 17 58 6 38 0 21 1794 95 59 46 26 27 8 9 4 1795 69 85 33 26 17 3 9 0 1796 81 72 24 22 2 2 1 0 1797 74 80 26 29 6 6 0 1 1798 137 17 83 1 23 0 1 0 1799 81 73 42 41 12 21 0 5 1800 121 33 74 4 43 1 21 0 1801 103 51 65 18 28 5 7 1 1802 46 108 13 43 3 10 0 2 1803 65 89 21 40 2 15 0 5 1804 68 86 14 33 0 10 0 3 1805 84 70 40 25 18 8 4 4 1806 100 54 59 15 22 1 4 0 1807 79 75 24 21 4 0 0 0 1808 113 41 62 15 30 3 11 0 1809 103 51 63 18 15 5 6 0 1810 75 79 20 36 3 11 1 1 1811 59 95 7 50 1 28 0 10 1812 105 49 31 8 7 1 1 0 1813 105 49 39 14 13 2 3 0 1814 47 107 9 42 0 10 0 1 1815 60 94 16 37 6 5 2 1 1816 83 71 44 39 17 21 5 9 1817 92 62 35 23 20 13 10 2 1818 129 25 92 16 36 3 9 0 1819 102 52 69 16 27 2 7 1 1820 122 32 76 10 35 0 11 0 1821 75 79 44 40 13 12 4 1 1822 127 27 83 7 36 0 11 0 1823 102 52 62 14 31 2 13 0 1824 101 53 62 20 39 2 12 0 1825 62 92 24 55 2 20 0 4 1826 62 92 26 55 4 20 0 8 1827 43 111 4 42 0 9 0 5 1828 21 133 2 77 0 45 0 21 1829 79 75 43 39 23 22 9 10 1830 39 115 8 53 0 22 0 13 1831 91 63 35 19 6 3 0 0 1832 44 110 16 63 3 32 1 14 1833 33 121 11 86 3 52 0 22 1834 81 73 44 32 20 13 7 2 1835 57 96 19 51 4 13 0 2 1836 65 89 15 41 1 12 0 4 1837 65 89 17 36 0 17 0 4 1838 75 79 40 44 11 29 0 12 1839 89 65 58 51 19 38 4 20 1840 62 92 17 53 0 16 0 7 1841 107 47 55 12 22 4 7 2 1842 99 55 65 3 36 0 11 0 1843 102 52 53 13 23 7 7 1 1844 68 86 27 45 8 11 2 3 1845 102 52 48 15 17 4 3 0 1846 97 57 45 12 21 1 10 0 1847 122 32 68 0 29 0 15 0 1848 110 44 55 9 24 0 10 0 1849 59 95 19 46 2 16 0 2 1850 73 81 10 25 0 12 0 3 1851 85 69 41 35 14 15 5 5 1852 92 62 27 12 6 5 2 1 1853 56 96 13 54 0 29 0 11 1854 46 108 5 43 0 13 0 4 1855 111 43 67 10 24 3 7 0 1856 118 36 71 14 25 0 7 0 1857 109 45 53 5 21 1 10 0 1858 65 89 21 38 3 8 0 0 1859 116 38 67 4 18 0 2 0 1860 85 69 36 28 10 7 0 0 1861 105 49 47 13 21 3 11 0 1862 69 84 33 47 14 18 3 5 1863 121 33 89 10 59 2 31 0 1864 134 20 88 6 46 0 20 0 1865 115 39 66 11 26 0 12 0 1866 38 116 9 72 3 36 0 11 1867 44 110 9 42 0 18 0 8 1868 65 89 34 48 6 30 0 19 1869 56 98 21 62 8 27 0 13 1870 120 34 61 6 14 3 0 0 1871 126 28 82 5 27 0 6 0 1872 107 47 38 7 5 0 2 0 1873 96 58 35 16 10 1 1 0 1874 123 31 77 2 36 0 11 0 1875 114 40 44 3 6 0 1 0 1876 82 72 27 30 3 7 0 1 1877 75 79 15 31 6 18 4 9 1878 35 119 1 66 0 22 0 8 1879 105 48 63 28 20 21 3 12 1880 101 53 56 20 26 5 15 1 1881 96 58 38 20 12 7 1 3 1882 58 96 18 44 6 18 0 3 1883 66 88 27 35 7 14 2 3 1884 49 105 7 56 1 21 0 5 1885 45 109 16 73 1 39 0 16 1886 100 54 50 18 14 4 1 1 1887 118 36 81 13 26 5 4 0 1888 75 79 22 35 5 16 0 2 1889 72 82 43 38 22 8 7 0 1890 99 53 51 23 13 9 3 4 1891 54 100 4 46 0 18 0 5 1892 55 99 11 48 1 19 0 7 1893 102 52 61 16 17 1 1 0 1894 115 39 75 21 23 12 1 8 1895 113 41 70 12 38 3 12 0 1896 109 45 51 6 15 0 3 0 1897 69 85 16 37 2 10 0 4 1898 72 82 34 30 7 7 3 0 1899 105 49 49 18 18 6 11 0 1900 94 60 52 26 17 7 6 3 1901 91 63 50 14 20 4 6 1 1902 86 68 48 33 23 15 6 6 1903 42 112 16 75 4 28 0 9 1904 85 69 45 44 25 13 11 2 1905 51 103 9 60 2 24 0 3 1906 40 114 7 57 0 27 0 6 1907 17 136 1 101 0 67 0 30 1908 23 131 3 94 0 48 0 15 1909 52 102 20 61 3 36 0 12 1910 112 42 61 20 20 7 3 3 1911 102 52 80 23 52 7 21 2 1912 32 122 4 76 0 31 0 16 1913 75 79 36 43 10 30 0 23 1914 67 87 53 63 25 38 7 23 1915 31 123 6 89 0 55 0 22 1916 40 114 9 76 3 42 0 14 1917 74 80 30 35 10 10 3 2 1918 115 39 73 11 25 3 6 1 1919 85 69 41 32 17 18 5 11 1920 68 86 17 39 2 20 0 7 1921 55 99 21 48 6 18 0 8 1922 60 94 23 34 7 10 3 0 1923 63 91 25 35 1 6 0 0 1924 66 88 36 47 26 23 15 8 1925 107 47 73 28 49 11 24 3 1926 104 50 65 23 18 6 0 0 1927 45 109 9 57 0 14 0 4 1928 50 104 8 64 0 20 0 3 1929 68 86 31 34 7 8 1 0 1930 88 66 42 13 8 1 3 0 1931 133 21 99 11 57 2 21 0 1932 79 75 19 30 2 9 0 3 1933 111 43 44 13 16 1 9 0 1934 139 15 121 2 93 0 53 0 1935 79 75 34 35 10 19 0 7 1936 142 12 101 5 54 1 20 0 1937 86 68 38 22 15 3 4 0 1938 43 110 3 51 0 7 0 1 1939 138 16 75 0 31 0 8 0 1940 128 26 61 7 25 0 6 0 1941 82 72 44 56 5 38 0 15 1942 27 127 1 83 0 37 0 16 1943 65 89 16 33 0 11 0 1 1944 76 78 42 26 7 8 0 0 1945 22 131 2 80 0 33 0 7 1946 67 87 20 34 9 4 1 0 1947 58 96 20 51 2 22 0 10 1948 92 62 31 35 13 15 1 2 1949 67 87 35 27 7 8 1 3 1950 80 74 30 20 7 2 0 0 1951 76 78 38 34 20 8 10 0 1952 88 66 36 25 17 7 0 0 1953 87 67 48 29 19 7 2 1 1954 120 34 79 12 37 2 16 0 1955 119 35 68 9 23 3 3 0 1956 121 33 83 13 46 3 29 1 1957 60 94 15 32 6 4 3 0 1958 45 109 6 47 1 6 0 1 1959 118 36 71 12 29 1 8 0 1960 74 79 27 12 12 0 2 0 1961 97 57 52 13 32 0 18 0 1962 61 93 12 40 0 8 0 0 1963 102 52 65 30 14 15 6 3 1964 122 32 72 8 20 1 2 0 1965 33 121 11 52 2 18 1 0 1966 109 45 55 6 18 0 2 0 1967 90 64 32 14 8 1 1 0 1968 93 61 35 28 11 10 5 1 1969 51 103 6 38 1 8 0 2 1970 77 77 15 18 3 1 0 0 1971 85 69 46 29 23 5 9 2 1972 80 73 39 27 9 8 2 3 1973 28 126 19 88 11 39 3 6 1974 80 74 49 36 17 11 3 1 1975 21 133 3 92 0 37 0 7 1976 73 81 28 36 10 12 4 1 1977 133 21 107 8 60 0 21 0 1978 61 93 23 44 8 30 1 16