Different climate response of three tree ring proxies of Pinus sylvestris from the Eastern Carpathians,Romania |
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| Institution: | 1. Forest Biometrics Laboratory, Faculty of Forestry, “?tefan cel Mare” University of Suceava, Romania;2. National Institute for Research and Development of Isotopic and Molecular Technologies, Department of Mass Spectrometry, Chromatography and Applied Physics, Cluj-Napoca, Romania;3. Alfred-Wegener-Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany;4. National Research and Development Institute for Forestry Marin Dracea, Campulung Moldovenesc, Romania;5. INCE - Mountain Economy Center CE-MONT Vatra Dornei, Romania;1. Faculty of Earth Sciences, University of Silesia, Sosnowiec, Poland;2. Institute of Botany and Landscape Ecology, University Greifswald, Greifswald, Germany;3. Department of Geography, University of Cambridge, Cambridge, UK;4. Swiss Federal Research Institute WSL, Birmensdorf, Switzerland;5. Czech Globe and Masaryk University, Brno, Czech Republic;1. Faculty of Forestry, ?tefan cel Mare University, Suceava, Romania;2. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Hungary;3. Stable Isotope Laboratory, ?tefan cel Mare University, Suceava, Romania;4. Departement of Geography, Johannes Gutenberg University, Mainz, Germany;5. Emil Racovi?? Institute of Speleology, Romanian Academy, Cluj Napoca, Romania;6. Institute of Biology, Romanian Academy, Bucharest, Romania;7. Marin Dracea National Research and Development Institute for Silviculture, Câmpulung Moldovenesc, Romania;1. School of Geography and Development, University of Arizona, USA;2. Laboratory of Tree-Ring Research, University of Arizona, USA;3. Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, USA;4. Siberian Federal University, Krasnoyarsk, Russia;1. Center for Ecological Research, Northeast Forestry University, Harbin, 150040, China;2. Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, School of Forestry, Northeast Forestry University, Harbin, 150040, China;3. Heilongjiang Institute of Meteorological Science, Harbin, 150030, China;4. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;5. Key Lab of Forest Ecology and Environment, State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China;6. Department of Life Science, Henan University, Kaifeng, 475001, China;1. Dendrology Department, University of Forestry, Sofia, Bulgaria;2. Institute of Geography, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | The aim of this study was to compare the climatic responses of three tree rings proxies: tree ring width (TRW), maximum latewood density (MXD), and blue intensity (BI). For this study, 20 cores of Pinus sylvestris covering the period 1886–2015 were extracted from living non-damaged trees from the Eastern Carpathian Mountains (Romania). Each chronology was compared to monthly and daily climate data. All tree ring proxies had a stronger correlation with the daily climate data compared to monthly data. The highest correlation coefficient was obtained between the MXD chronology and daily maximum temperature over the period beginning with the end of July and ending in the middle of September (r = 0.64). The optimal intervals for the temperature signature were 01 Aug – 24 Sept for the MXD chronology, 05 Aug – 25 Aug for the BI chronology, and both 16 Nov of the previous year – 16 March of the current year and 15 Apr – 05 May for the TRW chronology. The results from our study indicate that MXD can be used as a proxy indicator for summer maximum temperature, while TRW can be used as a proxy indicator for just March maximum temperature. The weak and unstable relationship between BI and maximum temperature indicates that BI is not a good proxy indicator for climate reconstructions over the analysed region. |
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| Keywords: | Tree ring widths Maximum density chronology Minimum blue intensity Climate signal Dendroclimatology Daily and monthly climatic data |
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