cc: k.briffa@uea,t.osborn@uea date: Mon, 28 Feb 2000 13:50:17 +0000 from: Tim Osborn subject: Re: newest reconstruction to: "Michael E. Mann" At 11:56 25/02/00 -0500, you wrote: >I need your newest northern hemisphere density-based tree-ring reconstruction >and appropriate reference for updating IPCC. Please send in ASCII format as >soon as possible so we can incorporate. I hope all is well. Thanks, Hi Mike Keith asked me to get back to you on this. The reconstruction is the same as the one I sent on the 5th October 1999, but I'm sending it again in case that e-mail isn't handy. The reconstruction has now been published, in the following paper: Briffa K.R. (2000) Annual climate variability in the Holocene: interpreting the message of ancient trees. Quaternary Science Reviews 19, 87-105. This paper does not, however, give full details about how the reconstruction was obtained. The details are not yet published, but will soon be submitted: Briffa KR, Osborn TJ, Schweingruber FH, Harris IC, Jones PD, Shiyatov SG and Vaganov EA (2000) Low-frequency temperature variations from a northern tree-ring density network. In preparation (to be submitted to Journal of Geophysical Research). Details about the file I'm sending you (repeated from 5th Oct 99): The data are attached to this e-mail. They go from 1402 to 1994, although we usually stop the series in 1960 because of the recent non-temperature signal that is superimposed on the tree-ring data that we use. I haven't put a 40-yr smoothing through them - I thought it best if you were to do this to ensure the same filter was used for all curves. The data I've sent are calibrated over the period 1881-1960 against the instrumental Apr-Sep tempratures averaged over all land grid boxes (that have observed data) that are north of 20N. As such, the mean of our reconstruction over 1881-1960 matches the mean of the observed target series over the same period. Since the observed series consists of degrees C anomalies wrt to 1961-90, we say that the reconstructed series also represents degrees C anomalies wrt to 1961-90. (I've already truncated the series at 1960 because of the problems with the recent period.) Best regards Tim Calibrated against observed Apr-Sep temperature over 1881-1960 averaged over all land grid boxes north of 20N Year Reconstructed temperature anomaly (degrees C wrt 1961-90) 1402 -0.283 1403 -0.334 1404 -0.286 1405 -0.350 1406 -0.152 1407 -0.124 1408 -0.220 1409 -0.175 1410 -0.100 1411 -0.129 1412 -0.226 1413 -0.115 1414 -0.386 1415 -0.319 1416 -0.277 1417 -0.136 1418 -0.172 1419 -0.294 1420 -0.280 1421 -0.335 1422 -0.406 1423 -0.312 1424 -0.207 1425 -0.136 1426 -0.354 1427 -0.222 1428 -0.305 1429 -0.322 1430 -0.282 1431 -0.143 1432 -0.212 1433 -0.234 1434 -0.076 1435 -0.309 1436 -0.411 1437 -0.122 1438 -0.272 1439 -0.159 1440 -0.330 1441 -0.160 1442 -0.105 1443 -0.080 1444 -0.308 1445 -0.138 1446 -0.317 1447 -0.270 1448 -0.301 1449 -0.357 1450 -0.137 1451 -0.183 1452 -0.207 1453 -0.485 1454 -0.265 1455 -0.358 1456 -0.241 1457 -0.199 1458 -0.366 1459 -0.397 1460 -0.252 1461 -0.230 1462 -0.252 1463 -0.209 1464 -0.174 1465 -0.174 1466 -0.280 1467 -0.256 1468 -0.256 1469 -0.222 1470 -0.237 1471 -0.094 1472 -0.122 1473 -0.056 1474 -0.320 1475 -0.376 1476 -0.133 1477 -0.075 1478 0.037 1479 -0.161 1480 -0.379 1481 -0.513 1482 -0.286 1483 -0.354 1484 -0.327 1485 -0.208 1486 -0.125 1487 -0.380 1488 -0.193 1489 -0.245 1490 -0.466 1491 -0.244 1492 -0.146 1493 -0.278 1494 -0.394 1495 -0.526 1496 -0.275 1497 -0.264 1498 -0.233 1499 -0.169 1500 -0.128 1501 -0.415 1502 -0.306 1503 0.011 1504 -0.013 1505 -0.378 1506 -0.226 1507 -0.428 1508 -0.192 1509 -0.312 1510 -0.157 1511 -0.162 1512 -0.188 1513 -0.135 1514 -0.418 1515 -0.258 1516 -0.381 1517 -0.134 1518 -0.180 1519 -0.166 1520 -0.035 1521 -0.384 1522 -0.302 1523 -0.541 1524 -0.371 1525 -0.183 1526 -0.289 1527 -0.224 1528 -0.247 1529 -0.432 1530 -0.291 1531 -0.467 1532 -0.343 1533 -0.586 1534 -0.183 1535 -0.417 1536 -0.350 1537 -0.257 1538 -0.451 1539 -0.398 1540 -0.497 1541 -0.406 1542 -0.584 1543 -0.448 1544 -0.317 1545 -0.312 1546 -0.289 1547 -0.114 1548 -0.459 1549 -0.335 1550 -0.009 1551 -0.074 1552 -0.047 1553 -0.207 1554 -0.285 1555 -0.116 1556 -0.141 1557 -0.419 1558 -0.174 1559 -0.465 1560 -0.287 1561 -0.169 1562 -0.231 1563 -0.270 1564 -0.347 1565 -0.116 1566 -0.202 1567 -0.278 1568 -0.445 1569 -0.488 1570 -0.465 1571 -0.434 1572 -0.674 1573 -0.324 1574 -0.493 1575 -0.273 1576 -0.623 1577 -0.483 1578 -0.521 1579 -0.551 1580 -0.473 1581 -0.436 1582 -0.382 1583 -0.345 1584 -0.280 1585 -0.565 1586 -0.409 1587 -0.580 1588 -0.530 1589 -0.534 1590 -0.354 1591 -0.377 1592 -0.407 1593 -0.337 1594 -0.591 1595 -0.459 1596 -0.436 1597 -0.475 1598 -0.152 1599 -0.134 1600 -0.381 1601 -1.169 1602 -0.403 1603 -0.414 1604 -0.472 1605 -0.393 1606 -0.564 1607 -0.529 1608 -0.822 1609 -0.789 1610 -0.617 1611 -0.681 1612 -0.670 1613 -0.364 1614 -0.733 1615 -0.428 1616 -0.698 1617 -0.479 1618 -0.485 1619 -0.524 1620 -0.706 1621 -0.671 1622 -0.714 1623 -0.662 1624 -0.387 1625 -0.566 1626 -0.671 1627 -0.665 1628 -0.759 1629 -0.654 1630 -0.379 1631 -0.466 1632 -0.330 1633 -0.377 1634 -0.521 1635 -0.222 1636 -0.265 1637 -0.252 1638 -0.396 1639 -0.382 1640 -0.400 1641 -1.152 1642 -1.067 1643 -1.092 1644 -0.649 1645 -0.588 1646 -0.632 1647 -0.554 1648 -0.368 1649 -0.572 1650 -0.215 1651 -0.317 1652 -0.529 1653 -0.268 1654 -0.343 1655 -0.400 1656 -0.372 1657 -0.332 1658 -0.359 1659 -0.182 1660 -0.260 1661 -0.258 1662 -0.433 1663 -0.433 1664 -0.353 1665 -0.440 1666 -0.837 1667 -0.857 1668 -0.816 1669 -0.779 1670 -0.871 1671 -0.463 1672 -0.434 1673 -0.631 1674 -0.663 1675 -0.870 1676 -0.523 1677 -0.670 1678 -0.794 1679 -0.768 1680 -0.701 1681 -0.380 1682 -0.518 1683 -0.364 1684 -0.369 1685 -0.688 1686 -0.178 1687 -0.481 1688 -0.351 1689 -0.229 1690 -0.254 1691 -0.221 1692 -0.545 1693 -0.263 1694 -0.316 1695 -0.955 1696 -0.816 1697 -0.687 1698 -1.054 1699 -1.005 1700 -0.630 1701 -0.818 1702 -0.510 1703 -0.377 1704 -0.420 1705 -0.527 1706 -0.328 1707 -0.257 1708 -0.465 1709 -0.493 1710 -0.288 1711 -0.344 1712 -0.345 1713 -0.242 1714 -0.390 1715 -0.305 1716 -0.390 1717 -0.309 1718 -0.270 1719 -0.194 1720 -0.110 1721 -0.427 1722 0.005 1723 -0.193 1724 -0.249 1725 -0.497 1726 -0.381 1727 -0.241 1728 -0.133 1729 -0.261 1730 -0.633 1731 -0.723 1732 -0.426 1733 -0.371 1734 -0.104 1735 -0.373 1736 -0.330 1737 -0.206 1738 -0.557 1739 -0.291 1740 -0.734 1741 -0.594 1742 -0.808 1743 -0.378 1744 -0.372 1745 -0.418 1746 -0.501 1747 -0.150 1748 -0.389 1749 -0.328 1750 -0.168 1751 -0.343 1752 -0.227 1753 -0.218 1754 -0.377 1755 -0.328 1756 -0.221 1757 -0.259 1758 -0.431 1759 -0.340 1760 -0.335 1761 -0.261 1762 -0.466 1763 -0.291 1764 -0.473 1765 -0.378 1766 -0.212 1767 -0.429 1768 -0.544 1769 -0.343 1770 -0.341 1771 -0.265 1772 -0.547 1773 -0.421 1774 -0.048 1775 -0.289 1776 -0.186 1777 -0.288 1778 -0.178 1779 -0.550 1780 -0.339 1781 -0.251 1782 -0.164 1783 -0.757 1784 -0.142 1785 -0.141 1786 -0.179 1787 -0.432 1788 -0.207 1789 -0.235 1790 -0.612 1791 -0.163 1792 -0.086 1793 -0.023 1794 -0.030 1795 -0.243 1796 -0.028 1797 -0.565 1798 -0.049 1799 -0.228 1800 -0.287 1801 -0.413 1802 -0.117 1803 0.020 1804 0.036 1805 -0.094 1806 -0.251 1807 -0.089 1808 -0.241 1809 -0.460 1810 -0.582 1811 -0.353 1812 -0.459 1813 -0.545 1814 -0.458 1815 -0.588 1816 -0.855 1817 -0.861 1818 -0.629 1819 -0.680 1820 -0.289 1821 -0.351 1822 -0.159 1823 -0.246 1824 -0.276 1825 -0.263 1826 -0.140 1827 -0.293 1828 -0.033 1829 -0.087 1830 -0.173 1831 -0.045 1832 -0.621 1833 -0.660 1834 -0.141 1835 -0.647 1836 -0.775 1837 -0.771 1838 -0.359 1839 -0.267 1840 -0.144 1841 -0.077 1842 -0.337 1843 -0.435 1844 -0.101 1845 -0.412 1846 0.106 1847 -0.079 1848 -0.346 1849 -0.393 1850 -0.261 1851 -0.165 1852 -0.100 1853 -0.174 1854 -0.138 1855 -0.418 1856 -0.250 1857 -0.538 1858 -0.126 1859 -0.195 1860 -0.231 1861 -0.029 1862 -0.555 1863 -0.303 1864 -0.407 1865 -0.256 1866 -0.437 1867 -0.413 1868 -0.119 1869 -0.321 1870 -0.213 1871 -0.352 1872 -0.163 1873 -0.183 1874 -0.372 1875 -0.247 1876 -0.487 1877 -0.192 1878 0.120 1879 -0.152 1880 -0.346 1881 -0.184 1882 -0.200 1883 -0.183 1884 -0.717 1885 -0.534 1886 -0.485 1887 -0.281 1888 -0.261 1889 -0.153 1890 -0.341 1891 -0.313 1892 -0.138 1893 -0.301 1894 -0.134 1895 -0.128 1896 -0.241 1897 -0.016 1898 0.065 1899 -0.574 1900 -0.218 1901 -0.049 1902 -0.287 1903 -0.142 1904 -0.205 1905 -0.308 1906 -0.034 1907 -0.412 1908 -0.048 1909 -0.214 1910 -0.147 1911 -0.194 1912 -0.631 1913 -0.161 1914 -0.294 1915 -0.074 1916 -0.277 1917 -0.297 1918 -0.460 1919 -0.013 1920 -0.272 1921 -0.114 1922 -0.036 1923 -0.305 1924 -0.141 1925 -0.258 1926 -0.115 1927 -0.198 1928 -0.018 1929 -0.161 1930 0.086 1931 0.104 1932 0.081 1933 -0.057 1934 0.007 1935 -0.037 1936 -0.019 1937 0.060 1938 0.163 1939 -0.075 1940 0.113 1941 -0.200 1942 0.128 1943 0.053 1944 -0.080 1945 0.059 1946 -0.016 1947 -0.188 1948 -0.038 1949 -0.107 1950 -0.269 1951 -0.100 1952 -0.118 1953 0.161 1954 -0.235 1955 -0.127 1956 -0.308 1957 -0.194 1958 -0.308 1959 -0.224 1960 0.076 Dr Timothy J Osborn | phone: +44 1603 592089 Senior Research Associate | fax: +44 1603 507784 Climatic Research Unit | e-mail: t.osborn@uea.ac.uk School of Environmental Sciences | web-site: University of East Anglia __________| http://www.cru.uea.ac.uk/~timo/ Norwich NR4 7TJ | sunclock: UK | http://www.cru.uea.ac.uk/~timo/sunclock.htm