# Archive/proxy # Tree ring #-------------------- # Contribution Date # Date: 2012-07-25 19:35:38 #-------------------- # Title # Study Name: Jämtland Sweden Tree ring Maximum density #-------------------- # Investigators: #-------------------- # Description and Notes #-------------------- # Publication # Citation: Gunnarson, Björn E. and Linderholm, Hans W. and Moberg, Anders # Journal Name: Climate Dynamics # Published Title: Improving a tree-ring reconstruction from west-central Scandinavia: 900 years of warm-season temperatures # Published Date: 2010 # DOI: 10.1007/s00382-010-0783-5 # Abstract: Dendroclimatological sampling of Scots pine (Pinus sylvestris L.) has been made in the province of Jämtland, in the west-central Scandinavian mountains, since the 1970s. The tree-ring width (TRW) chronology spans several thousand years and has been used to reconstruct June–August temperatures back to 1632 bc. A maximum latewood density (MXD) dataset, covering the period ad 1107–1827 (with gap 1292–1315) was presented in the 1980s by Fritz Schweingruber. Here we combine these historical MXD data with recently collected MXD data covering ad 1292–2006 into a single reconstruction of April–September temperatures for the period ad 1107–2006. Regional curve standardization (RCS) provides more low-frequency variability than ”non-RCS„ and stronger correlation with local seasonal temperatures (51% variance explained). The MXD chronology shows a stronger relationship with temperatures than the TRW data, but the two chronologies show similar multi-decadal variations back to ad 1500. According to the MXD chronology, the period since ad 1930 and around ad 1150–1200 were the warmest during the last 900 years. Due to large uncertainties in the early part of the combined MXD chronology, it is not possible to conclude which period was the warmest. More sampling of trees growing near the tree-line is needed to further improve the MXD chronology. #---------------------- # Science Keywords: PAGES 2k Network, PAGES Arctic 2k, Arctic 2k, temperature, annual resolution #-------------------- # Site Name # Region: Scandinavia # Country: Sweden # Northmost Latitude: 63.5 # Southmost Latitude: 63.5 # Eastmost Longitute: 15.5 # Westmost Longitute: 15.5 # Elevation: #------------------ # Data Collection # Core Name: Jämtland # First Year: 1107 # Last Year: 2007 # Time Unit: AD #------------------ # Searchable Controlled Keywords # >tree-ring>density>reconstruction #---------------- # Variables # age_AD Age (years AD) # temp.rcs.apr-sep Tree Ring Standardized Growth Index # age_AD temp.rcs.apr-sep 2007 10.4393 2006 11.0141 2005 9.5673 2004 9.924 2003 10.4856 2002 10.1354 2001 9.3228 2000 9.1841 1999 9.8051 1998 9.0916 1997 10.2676 1996 9.4351 1995 9.3625 1994 9.8513 1993 9.2435 1992 9.1973 1991 9.8646 1990 9.7721 1989 9.9042 1988 9.924 1987 8.6093 1986 9.4219 1985 9.2898 1984 9.151 1983 9.2039 1982 9.4351 1981 9.3757 1980 9.9438 1979 9.0453 1978 9.4748 1977 8.9661 1976 9.858 1975 10.261 1974 9.6333 1973 9.8646 1972 10.2543 1971 8.6556 1970 9.2634 1969 9.7589 1968 9.8381 1967 9.9901 1966 9.3823 1965 9.5342 1964 9.6267 1963 9.858 1962 8.6423 1961 9.2964 1960 9.8844 1959 10.545 1958 9.2303 1957 9.6267 1956 9.4946 1955 10.2477 1954 9.858 1953 10.0628 1952 9.3757 1951 10.2543 1950 10.3799 1949 9.5078 1948 10.4459 1947 10.6441 1946 10.3402 1945 9.8315 1944 9.6598 1943 10.1288 1942 9.7919 1941 9.6003 1940 9.9901 1939 10.0826 1938 10.0297 1937 10.664 1936 9.924 1935 8.9727 1934 10.3138 1933 9.8844 1932 9.4153 1931 8.9859 1930 10.3931 1929 9.0321 1928 8.8471 1927 9.6267 1926 9.7258 1925 10.2742 1924 9.9306 1923 8.5168 1922 9.5607 1921 9.2501 1920 9.6399 1919 9.5739 1918 9.891 1917 9.3955 1916 9.0057 1915 8.7018 1914 9.5078 1913 8.8405 1912 9.0189 1911 8.7943 1910 9.5871 1909 8.2195 1908 9.27 1907 8.312 1906 9.0519 1905 8.0411 1904 8.1997 1903 8.497 1902 8.1336 1901 9.9174 1900 8.7547 1899 8.0081 1898 8.6556 1897 9.6399 1896 9.3426 1895 9.2568 1894 9.4153 1893 9.085 1892 8.5697 1891 8.7084 1890 8.8604 1889 9.3096 1888 8.5102 1887 9.0057 1886 9.1973 1885 8.3649 1884 9.3426 1883 9.3691 1882 9.3559 1881 8.1601 1880 9.0519 1879 9.6994 1878 9.1444 1877 8.4904 1876 8.7877 1875 9.4682 1874 8.7679 1873 8.8736 1872 9.4946 1871 8.4441 1870 9.3426 1869 8.2988 1868 9.9438 1867 8.464 1866 8.4838 1865 8.5432 1864 8.3715 1863 8.53 1862 8.9264 1861 9.2898 1860 9.4219 1859 8.9 1858 9.7126 1857 8.9462 1856 8.2988 1855 9.6135 1854 9.1246 1853 8.6027 1852 9.151 1851 8.1733 1850 8.7018 1849 8.6225 1848 8.5697 1847 9.1378 1846 9.5012 1845 9.303 1844 8.4838 1843 8.6027 1842 8.9528 1841 8.5168 1840 8.8273 1839 8.8802 1838 8.4838 1837 9.3823 1836 8.9793 1835 9.2964 1834 10.0429 1833 8.7282 1832 8.6291 1831 10.1883 1830 9.5078 1829 9.5276 1828 9.9637 1827 9.2336 1826 10.3138 1825 9.2105 1824 8.976 1823 9.1808 1822 9.042 1821 8.1468 1820 9.3592 1819 9.6498 1818 8.6919 1817 8.6126 1816 8.3913 1815 8.7018 1814 8.9925 1813 8.9892 1812 8.2195 1811 8.6985 1810 8.5069 1809 9.0024 1808 8.7811 1807 8.748 1806 8.9363 1805 8.8108 1804 9.3393 1803 8.8901 1802 8.2757 1801 8.8571 1800 8.8339 1799 8.5598 1798 9.4483 1797 9.1213 1796 8.824 1795 8.7381 1794 8.9132 1793 8.6423 1792 8.6787 1791 8.5168 1790 7.9982 1789 9.0553 1788 8.7447 1787 8.2129 1786 8.127 1785 8.4276 1784 7.9156 1783 8.6456 1782 8.2988 1781 9.0718 1780 8.8868 1779 9.4583 1778 9.3823 1777 9.0024 1776 9.706 1775 9.6102 1774 9.4483 1773 9.2766 1772 8.1601 1771 8.8504 1770 8.9925 1769 8.9099 1768 8.8901 1767 8.8339 1766 9.5309 1765 8.8042 1764 9.085 1763 9.2204 1762 9.0586 1761 9.4318 1760 9.0751 1759 8.7811 1758 9.2072 1757 9.336 1756 8.7183 1755 9.1444 1754 9.0553 1753 9.1114 1752 10.0793 1751 9.1246 1750 9.3922 1749 9.3129 1748 9.0982 1747 8.8075 1746 8.8967 1745 8.9958 1744 8.976 1743 8.5432 1742 7.7174 1741 7.9982 1740 8.6489 1739 8.7117 1738 9.5309 1737 8.6489 1736 9.4054 1735 9.3261 1734 9.0255 1733 8.7249 1732 9.1312 1731 8.6027 1730 9.2733 1729 8.7646 1728 8.355 1727 9.0949 1726 8.9363 1725 8.7613 1724 8.6886 1723 8.7646 1722 8.2856 1721 8.9066 1720 8.7613 1719 8.6919 1718 8.6853 1717 8.5069 1716 8.312 1715 8.9495 1714 8.6556 1713 8.5994 1712 8.7018 1711 8.7084 1710 8.0775 1709 8.3979 1708 8.1733 1707 8.8174 1706 8.4375 1705 8.018 1704 8.3781 1703 9.6763 1702 9.0949 1701 8.5465 1700 8.9264 1699 8.5994 1698 8.8471 1697 8.8207 1696 8.5201 1695 8.2724 1694 9.2964 1693 9.6928 1692 9.1676 1691 9.4946 1690 9.1411 1689 9.6399 1688 8.976 1687 8.497 1686 8.7018 1685 8.8835 1684 9.6267 1683 9.2634 1682 9.0718 1681 9.2369 1680 9.0486 1679 9.2303 1678 9.0586 1677 8.7018 1676 9.0817 1675 8.3913 1674 8.5697 1673 8.9099 1672 8.7613 1671 9.27 1670 9.1378 1669 9.4087 1668 9.0982 1667 8.3318 1666 9.5243 1665 9.5871 1664 9.3426 1663 8.682 1662 8.6225 1661 8.9396 1660 8.8637 1659 8.7513 1658 9.0586 1657 9.1676 1656 8.9165 1655 9.8381 1654 8.7547 1653 8.6556 1652 9.5607 1651 8.8934 1650 8.7877 1649 9.1775 1648 8.7976 1647 8.2228 1646 8.8769 1645 8.573 1644 9.0387 1643 8.4408 1642 8.2955 1641 8.1568 1640 9.3063 1639 8.4408 1638 8.4177 1637 8.6787 1636 8.6159 1635 8.2261 1634 9.1081 1633 8.0114 1632 8.0841 1631 9.5739 1630 8.8108 1629 9.554 1628 8.8802 1627 9.1709 1626 9.0949 1625 9.2006 1624 9.151 1623 9.1742 1622 9.6036 1621 9.1973 1620 9.0222 1619 9.0354 1618 9.2336 1617 9.5309 1616 8.7613 1615 8.5895 1614 7.8132 1613 9.7291 1612 8.7646 1611 8.9661 1610 8.8471 1609 8.7613 1608 8.312 1607 8.8868 1606 8.682 1605 8.9297 1604 8.0676 1603 8.388 1602 8.0114 1601 7.9354 1600 8.3054 1599 8.9429 1598 9.1709 1597 8.5498 1596 8.9066 1595 8.2162 1594 8.6489 1593 8.4838 1592 8.8438 1591 8.5201 1590 8.8934 1589 8.6456 1588 9.1411 1587 8.279 1586 9.5342 1585 9.4219 1584 9.4351 1583 9.0685 1582 9.085 1581 9.0486 1580 8.6027 1579 8.1733 1578 9.0288 1577 8.5796 1576 8.7844 1575 9.5507 1574 9.1709 1573 9.0586 1572 9.0321 1571 9.5574 1570 9.706 1569 9.1147 1568 9.1213 1567 8.8835 1566 9.2006 1565 9.3129 1564 9.6498 1563 8.9297 1562 9.2105 1561 9.8018 1560 9.6697 1559 9.7027 1558 9.9207 1557 9.2402 1556 9.5342 1555 9.151 1554 8.8967 1553 9.1775 1552 8.748 1551 9.2039 1550 8.9033 1549 9.1048 1548 9.0156 1547 9.1775 1546 9.1543 1545 9.27 1544 8.9595 1543 9.4351 1542 9.118 1541 9.3592 1540 9.6631 1539 9.554 1538 9.3492 1537 9.5607 1536 9.0519 1535 9.5706 1534 9.6664 1533 9.6763 1532 9.5243 1531 9.303 1530 9.1411 1529 8.6688 1528 9.3426 1527 8.9165 1526 9.3393 1525 8.8703 1524 8.6357 1523 9.412 1522 9.0255 1521 9.3459 1520 8.5366 1519 9.6234 1518 9.6531 1517 9.2336 1516 8.8042 1515 9.6994 1514 9.5276 1513 9.5838 1512 9.5838 1511 9.4781 1510 9.0817 1509 9.4153 1508 10.0628 1507 9.0718 1506 9.6961 1505 9.8249 1504 9.2931 1503 9.5706 1502 9.7159 1501 9.2105 1500 9.2501 1499 9.6333 1498 9.521 1497 8.2492 1496 10.2147 1495 9.3162 1494 9.673 1493 9.3856 1492 9.8117 1491 9.2898 1490 9.5012 1489 9.5805 1488 8.8339 1487 9.227 1486 9.2501 1485 10.0859 1484 9.6465 1483 9.4649 1482 9.4021 1481 9.2303 1480 9.1709 1479 9.3856 1478 8.7844 1477 9.4814 1476 9.445 1475 9.2931 1474 9.5805 1473 8.9793 1472 8.9628 1471 9.1775 1470 8.8075 1469 9.0619 1468 9.0751 1467 9.1742 1466 9.4054 1465 9.2237 1464 8.9429 1463 9.0255 1462 9.0982 1461 8.3682 1460 9.3691 1459 9.1973 1458 9.1345 1457 8.9826 1456 8.6787 1455 8.8471 1454 9.4318 1453 7.9982 1452 9.3393 1451 9.9868 1450 9.6432 1449 9.8712 1448 9.3658 1447 9.1577 1446 9.2039 1445 9.2303 1444 9.4252 1443 8.8769 1442 9.1048 1441 9.5144 1440 9.0486 1439 9.151 1438 9.2072 1437 9.3393 1436 9.3658 1435 9.7754 1434 9.8117 1433 9.455 1432 9.6234 1431 9.5375 1430 9.151 1429 9.5607 1428 9.1246 1427 9.4847 1426 9.0982 1425 9.7258 1424 9.4583 1423 8.6952 1422 9.3525 1421 8.4078 1420 9.2568 1419 8.497 1418 9.5739 1417 9.0156 1416 9.0156 1415 9.2667 1414 8.6754 1413 9.63 1412 8.9066 1411 9.7291 1410 9.6796 1409 9.7258 1408 9.455 1407 9.1378 1406 9.8844 1405 8.9562 1404 9.5012 1403 9.4913 1402 10 1401 9.6531 1400 9.1048 1399 9.0486 1398 9.194 1397 9.336 1396 9.1841 1395 9.0916 1394 8.824 1393 9.0321 1392 8.976 1391 9.8018 1390 10.0628 1389 9.0586 1388 9.2568 1387 8.9264 1386 9.7589 1385 9.0123 1384 9.9438 1383 10.2709 1382 9.0982 1381 9.2402 1380 9.5078 1379 9.9009 1378 9.2832 1377 8.3186 1376 9.2237 1375 8.748 1374 9.5772 1373 8.7282 1372 9.5111 1371 9.6664 1370 8.8637 1369 9.2667 1368 9.5111 1367 8.7381 1366 9.4252 1365 9.5574 1364 9.8646 1363 8.5829 1362 9.0123 1361 8.715 1360 8.8471 1359 9.1676 1358 8.6159 1357 8.4805 1356 8.4177 1355 8.8339 1354 9.5441 1353 8.9793 1352 8.345 1351 9.4913 1350 9.2138 1349 8.6324 1348 8.2162 1347 9.1577 1346 8.2724 1345 9.1775 1344 8.8108 1343 8.9859 1342 9.0024 1341 8.018 1340 8.7513 1339 7.9784 1338 9.3922 1337 8.867 1336 8.9165 1335 9.1147 1334 10.0198 1333 8.8207 1332 9.2138 1331 9.5507 1330 9.0817 1329 8.5664 1328 9.5045 1327 9.1411 1326 8.8571 1325 8.9694 1324 8.6589 1323 8.1733 1322 9.4483 1321 9.009 1320 9.1709 1319 8.4871 1318 9.1676 1317 8.2988 1316 9.0685 1315 9.7522 1314 8.8604 1313 8.5763 1312 9.6862 1311 8.8471 1310 9.3691 1309 6.8784 1308 8.4838 1307 8.7943 1306 8.933 1305 8.4507 1304 8.5565 1303 8.9859 1302 9.2435 1301 8.682 1300 10.0562 1299 9.5012 1298 9.2898 1297 10.109 1296 8.8802 1295 9.3691 1294 8.3847 1293 8.7679 1292 9.1709 1291 9.0883 1290 8.9595 1289 9.1709 1288 9.6531 1287 9.4021 1286 9.4616 1285 9.5276 1284 9.1907 1283 8.6622 1282 8.6093 1281 8.5036 1280 8.6225 1279 8.3054 1278 9.2369 1277 8.3715 1276 8.5432 1275 7.7769 1274 8.2063 1273 8.7414 1272 9.1841 1271 9.5144 1270 8.6622 1269 9.4285 1268 8.2393 1267 8.7216 1266 8.3054 1265 8.9198 1264 8.2592 1263 8.7216 1262 8.5168 1261 8.279 1260 8.2856 1259 8.5697 1258 8.3252 1257 9.4021 1256 9.0982 1255 8.9198 1254 8.8141 1253 9.4682 1252 7.9949 1251 8.8141 1250 9.4285 1249 9.1444 1248 9.0519 1247 9.2435 1246 8.9462 1245 9.0057 1244 9.1709 1243 9.0189 1242 8.9595 1241 8.9991 1240 9.2303 1239 8.5697 1238 8.3715 1237 8.4574 1236 8.9066 1235 9.2501 1234 9.0123 1233 9.1312 1232 8.8273 1231 9.521 1230 9.151 1229 8.9528 1228 9.6135 1227 10.3336 1226 9.3889 1225 9.118 1224 9.858 1223 9.4087 1222 9.6399 1221 9.7126 1220 9.6928 1219 9.4946 1218 9.4153 1217 9.9438 1216 10.142 1215 9.9174 1214 10.0165 1213 10.4129 1212 9.9703 1211 10.2808 1210 9.7985 1209 9.9504 1208 9.4682 1207 9.5408 1206 10.2477 1205 9.9306 1204 9.9372 1203 10.0033 1202 9.6796 1201 9.9306 1200 10.2279 1199 9.9372 1198 10.3204 1197 9.673 1196 9.9571 1195 10.109 1194 9.9571 1193 9.4946 1192 9.6598 1191 9.924 1190 10.0165 1189 9.9637 1188 9.8381 1187 9.9306 1186 9.6862 1185 9.7126 1184 10.0892 1183 9.7522 1182 9.9174 1181 9.5012 1180 9.7655 1179 9.8315 1178 10.0165 1177 10.1222 1176 9.455 1175 9.7787 1174 9.4814 1173 9.5078 1172 9.6664 1171 9.5673 1170 9.9504 1169 9.5276 1168 10.0429 1167 9.7787 1166 9.6598 1165 9.6333 1164 10.0826 1163 9.4351 1162 10.0495 1161 10.2411 1160 10.0099 1159 10.1949 1158 10.3006 1157 9.739 1156 10.3534 1155 10.3667 1154 9.8249 1153 9.9306 1152 9.706 1151 9.9438 1150 10.3072 1149 10.2543 1148 10.076 1147 10.0363 1146 9.6598 1145 9.706 1144 9.924 1143 9.858 1142 9.2501 1141 9.9042 1140 9.7589 1139 9.739 1138 9.8315 1137 9.5607 1136 9.3625 1135 10.2147 1134 9.6928 1133 8.9859 1132 10.0429 1131 9.8646 1130 9.336 1129 9.673 1128 9.0123 1127 8.7348 1126 9.1246 1125 9.4682 1124 9.7721 1123 9.3625 1122 9.5607 1121 9.6862 1120 10.0562 1119 9.5078 1118 9.2303 1117 8.8934 1116 8.6159 1115 8.2327 1114 9.1775 1113 8.1534 1112 9.0652 1111 7.909 1110 9.0123 1109 7.4664 1108 7.7306 1107 7.4399