noaa-tree-22548 Wache, Bhutan 269 Year Tree Ring Oxygen Isotope Data Sano, M.; Tshering, P.; Komori, J.; Fujita, K.; Xu, C.; Nakatsuka, T. Wache, Bhutan 269 Year Tree Ring Oxygen Isotope Data 2017-08-23 NCDC-Paleoclimatology ONLINE Files 10.25921/hqcg-gy96 https://www.ncdc.noaa.gov/paleo/study/22548 Investigator M. Sano Investigator P. Tshering Investigator J. Komori Investigator K. Fujita Investigator C. Xu Investigator T. Nakatsuka earth science paleoclimate tree ring delta 18O,alpha cellulose,null,per mil VSMOW,null,tree ring,null,null,N,null earth science paleoclimate tree ring age,null,null,year Common Era,null,tree ring,null,null,N,null earth science paleoclimate tree-ring oxygen isotopes geoscientificInformation Monsoon LAGR Larix griffithiana (Lindl. & Gord.) Carr. Himalayan larch 1743 AD 2011 AD 207 cal yr BP -61 cal yr BP Complete 27.983 27.983 90 90 3500 3500 Continent Asia Southcentral Asia Bhutan Wache>LATITUDE 27.983>LONGITUDE 90 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Masaki Sano, Phuntsho Tshering, Jiro Komori, Koji Fujita, Chenxi Xu, Takeshi Nakatsuka 2013 Journal of Geophysical Research: Atmospheres 118 15 8399-8410 10.1002/jgrd.50664 http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50664/full

We developed a 50-year tree ring d18O chronology for each of three tree species (Juniperus indica, Larix griffithii, and Picea spinulosa) using a total of 12 trees (four trees per species) from the Bhutan Himalaya. Despite originating from different species sampled at two different altitudes, the d18O chronologies are highly correlated with one another (r = 0.76-0.89). Response analyses reveal that tree ring d18O values are controlled mainly by summer precipitation, irrespective of species. Based on these results, a robust 269-year d18O chronology was established to reconstruct the amount of May-September precipitation based on data from four larch trees. Our tree ring d18O data show significant correlations with those from other regions of the Himalaya and the Tibetan Plateau, indicating that common signals related to monsoon activity are recorded in the data. However, at centennial timescales, our data from Bhutan show normal conditions during the 20th century, whereas records from sites in western Nepal and the southern/eastern Tibetan Plateau show weakening trends in monsoon intensity during the last 100-200 years; the weakening trends may be the result of a reduction in the meridional sea surface temperature gradient in the Indian Ocean during this time. At continental scales, the tree ring records show that areas more from ocean basins are particularly sensitive to reduced monsoon circulation. Correlation analyses suggest that the El Niño-Southern Oscillation (ENSO) plays an important role in modulating summer precipitation. However, the teleconnected relationship disappears during the period 1951-1970, coinciding with a negative phase of the Pacific Decadal Oscillation (PDO), implying interdecadal modulation of the PDO on the influence of the ENSO on precipitation in Bhutan. STUDY NOTES: Larix griffithii tree-ring oxygen isotope (d18O) data from Wache, Lunana, Bhutan, for the past 269 years. IITRDB27

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/asia/bhutan/wache2013d18o.txt Formatted Text Data File; Wache Tree Ring Oxygen Isotope Data USA/NOAA DIF Version 9.8.4 2019-07-01 2019-07-01