Sygera Mountain, Tibetan Plateau 189 Year Summer Temperature Reconstruction Li, M.Y.; Duan, J.; Wang, L.; Zhu, H.F. Li, M.Y. Duan, J. Wang, L. Zhu, H.F. Air Temperature Reconstruction earth science/paleoclimate/climate reconstructions|tree ring (age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/tree ring (latewood density,null,null,dimensionless,null,tree ring,null,null,N,chronology indices) earth science/paleoclimate/climate reconstructions|tree ring (temperature,ring density,null,degree Celsius,Aug-Sep,climate reconstructions|tree ring,null,null,N,based on mean latewood density) earth science/paleoclimate/tree ring (number of samples,null,null,count,null,tree ring,null,null,N,Sample depths for mean latewood density) earth science/paleoclimate/reconstructions (Sygera Mountain>LATITUDE 29.64>LONGITUDE 94.71) Although several tree-ring density-based summer/late summer temperature reconstructions have been developed on the Tibetan Plateau (TP), the understanding of the local/regional characteristics of summer temperature fluctuations on a long-term scale in some regions is still limited. To improve our understanding in these aspects, more local or regional summer temperature reconstructions extending back over several centuries are required. In this study, a new mean latewood density (LWD) chronology from Abies georgei var. smithii from the upper tree line of Sygera Mountain on the southeastern TP was developed to reconstruct the late summer temperature variability since 1820CE. The bootstrapped correlation analysis showed that the LWD chronology index was significantly and positively correlated with the late summer (August-September) mean temperatures (r1950-2008=0.63, p<0.001) recorded at the nearest meteorological station and that this reconstruction has considerable potential to represent the late summer temperature variability at the regional scale. Our late summer temperature reconstruction revealed three obvious cold periods (i.e., 1872-1908, 1913-1937 and 1941-1966) and two relatively warm phases (i.e., 1821-1871 and 1970-2008) over the past two centuries. Comparisons of our reconstruction with other independent tree-ring-based temperature reconstructions, glacier fluctuations and historical documental records from neighboring regions showed good agreement in these relatively cold and warm intervals. Our reconstruction exhibits an overall increasing temperature trend since the 1960s, providing new evidence supporting the recent warming of the TP. Moreover, our results also indicate that the late summer temperature variability of Sygera Mountain on the southeastern TP has potential links with the Pacific Decadal Oscillation (PDO). STUDY NOTES: Late summer (August-September) mean temperature reconstruction for the Sygera Mountains region, southeastern Tibetan Plateau, since 1820 CE, based on tree-ring mean latewood density (LWD) chronology. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Li, M.Y. Investigator : Duan, J. Investigator : Wang, L. Investigator : Zhu, H.F. 2018-04-28 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/23950 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/asia/china/sygera2018temp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/asia/china/sygera2018temp.txt English https://www.ncdc.noaa.gov/paleo/study/23950 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/asia/china/sygera2018temp.txt Mingyong Li, Jianping Duan, Lily Wang, Haifeng Zhu2018Late summer temperature reconstruction based on tree-ring density for Sygera Mountain, southeastern Tibetan PlateauGlobal and Planetary Change16310-1710.1016/j.gloplacha.2018.02.005https://www.sciencedirect.com/science/article/pii/S0921818117303235 START YEAR: 1820 AD * END YEAR: 2008 AD 94.71 29.64 94.71 29.64