# 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
