#----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original reference when using these data, # plus the Online Resource and date accessed. # # # Archive: Tree-ring #-------------------- # Contribution_Date # Date: 2013-05-15 #-------------------- # Title # Study_Name: Pyrenees, 1260-2006 AD, Maximum Latewood Density, tree ring width, Mountain Pine #-------------------- # Investigators # Investigators: Dorado Linan, I.; Büntgen, U.; Gonzalez-Rouco, F.; Zorita, E.; Montavez, J.P.; Gomez-Navarro, J.J.; Brunet, M.; Heinrich, I.; Helle, G.; Gutierrez, E. #-------------------- # Description_and_Notes # Description: A dataset of 804 individual maximum density (MXD) treering series, grouped into 22 chronologies covering the Pyrenees area, was available for the present study. The network # includes the two chronologies previously used to develop the first tree-ring based regional reconstruction of past maximum temperatures in the Pyrenees (Büntgen et al., 2008): additional # data published in Büntgen et al. (2010), and a newly developed 700-yr long MXD chronology. Compared to the previous reconstruction of maximum temperature, the new # dataset covers a wider area and uses a larger replication, not only in most recent centuries, but also in the earliest part of the period (1260-1350 AD). # The location, elevation and tree species at each site are indicated in Fig. 1. The species sampled were Mountain pine (Pinus uncinata Ramond ex DC. in Lam. et DC.), a shade-intolerant # and long-lived conifer that grows under temperate subalpine climate conditions and dominates at elevations above 1800m a.s.l., and Silver fir (Abies alba Mill.) that usually # grows at humid sites on north facing, shady slopes and at elevations above 1200m a .s.l. (Macias et al., 2006). Scientific name "Pinus mugo Turra = Pinus montana Mill." used as a synonym for the species "Pinus uncinata Ramond ex DC". #-------------------- # Publication # Authors: Dorado Linan, I., U. Büntgen, F. Gonzalez-Rouco, E. Zorita, J.P. Montavez, J.J. Gomez-Navarro, M. Brunet, I. Heinrich, G. Helle, and E. Gutierrez # Published_Date_or_Year: 2012-05-24 # Published_Title: Estimating 750 years of temperature variations and uncertainties in the Pyrenees by tree-ring reconstructions and climate simulations # Journal_Name: Climate of the Past # Volume: 8 # Edition: # Issue: # Pages: 919-933 # Report_Number: # DOI: 10.5194/cp-8-919-2012 # Publication_Place: D-37081 Göttingen, Germany # Publisher: Copernicus Publications # ISBN: 1814-9324 # Online_Resource: www.clim-past.net/8/919/2012/ # Other_Reference_Details: # Abstract: Past temperature variations are usually inferred from proxy data or estimated using general circulation models. Comparisons between climate estimations derived from # proxy records and from model simulations help to better understand mechanisms driving climate variations, and also offer the possibility to identify deficiencies in both approaches. # This paper presents regional temperature reconstructions based on tree-ring maximum density series in the Pyrenees, and compares them with the output of global simulations for # this region and with regional climate model simulations conducted for the target region. An ensemble of 24 reconstructions of May-to-September regional mean temperature was # derived from 22 maximum density tree-ring site chronologies distributed over the larger Pyrenees area. Four different tree-ring series standardization procedures were applied, # combining two detrending methods: 300-yr spline and the regional curve standardization (RCS). Additionally, different methodological variants for the regional chronology were # generated by using three different aggregation methods. Calibration verification trials were performed in split periods and using two methods: regression and a simple variance matching. # The resulting set of temperature reconstructions was compared with climate simulations performed with global (ECHO-G) and regional (MM5) climate models. The 24 variants of May-to-September temperature reconstructions # reveal a generally coherent pattern of inter-annual to multi-centennial temperature variations in the Pyrenees region for the last 750 yr. However, some reconstructions display # a marked positive trend for the entire length of the reconstruction, pointing out that the application of the RCS method to a suboptimal set of samples may lead to unreliable results. # Climate model simulations agree with the tree-ring based reconstructions at multi-decadal time scales, suggesting solar variability and volcanism as the main factors controlling # preindustrial mean temperature variations in the Pyrenees. Nevertheless, the comparison also highlights differences with the reconstructions, mainly in the amplitude of # past temperature variations and in the 20th century trends. Neither proxy-based reconstructions nor model simulations are able to perfectly track the temperature variations of the # instrumental record, suggesting that both approximations still need further improvements. #------------------ # Funding_Agency # Funding_Agency_Name: European Union # Grant: project MILLENNIUM (017008-2) #------------------ # Funding_Agency # Funding_Agency_Name: Spanish Government # Grant: SALVA´-SINOBAS(CGL2008-06558-C02-01/CLI)+SPECT MORE(CGL2008-06558-C02-02/CLI) #------------------ # Site_Information # Site_Name: Pyrenees # Location: Europe>Southern Europe>Spain # Region: PAGES Euro Med 2k # Country: Europe # Northernmost_Latitude: 42.5 # Southernmost_Latitude: 42.5 # Easternmost_Longitude: 1 # Westernmost_Longitude: 1 # Elevation: 1200 m #------------------ # Data_Collection # Collection_Name: Pyrenees12 PAGES 2k # Earliest_Year: 1260 # Most_Recent_Year: 2006 # Time_Unit: years AD # Core_Length: # Notes: This dataset is about Pyrenees Tree ring data; PAGES ID, Eur_9; Correlation with temperature, positive, CRUTEM4v ; #------------------ # Species # # Species_Name: Pinus mugo Turra = Pinus montana Mill. Pinus uncinata Ramond ex DC # Common_Name: Mountain Pine #------------------ # Variables # Year_AD year , , , calendar years AD, , , , , N T_recon Temperature, MXD/TRW , , degrees Celsius , warm season temperatures, Tree ring, May-September Temperature , , N #---------------- # Data # Year T_recon 1260 -1.612456377 1261 -0.703462745 1262 -0.359705473 1263 -0.767352598 1264 -0.60117619 1265 -0.733295069 1266 -1.352270432 1267 -1.108959101 1268 -0.512672218 1269 -1.123482535 1270 -0.032804475 1271 -0.442964153 1272 -0.414375689 1273 -0.578613663 1274 0.117459286 1275 -0.306598256 1276 -0.45500647 1277 -0.259166294 1278 -0.238527413 1279 0.108632643 1280 0.298997093 1281 0.004228856 1282 -0.977574261 1283 -1.511151914 1284 -0.634986896 1285 -1.179524813 1286 0.355907317 1287 -1.40398516 1288 -1.492632919 1289 -0.76891772 1290 -1.412941653 1291 -0.494127043 1292 -1.059609107 1293 -0.177517872 1294 -1.308833542 1295 -0.721744801 1296 0.096528632 1297 -0.687187527 1298 -1.367809975 1299 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