noaa-tree-22547 Humla, Western Nepal 223 Year Tree Ring Oxygen Isotope Data Sano, M.; Ramesh, R.; Sheshshayee, M.S.; Sukumar, R. Humla, Western Nepal 223 Year Tree Ring Oxygen Isotope Data 2017-08-23 NCDC-Paleoclimatology ONLINE Files 10.25921/9w68-zf20 https://www.ncdc.noaa.gov/paleo/study/22547 Investigator M. Sano Investigator R. Ramesh Investigator M.S. Sheshshayee Investigator R. Sukumar earth science paleoclimate tree ring delta 18O,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 ABSB Abies spectabilis (D. Don) Spach silver fir East Himalayan fir 1778 AD 2000 AD 172 cal yr BP -50 cal yr BP Complete 29.85 29.85 81.93 81.93 3850 3850 Continent Asia Southcentral Asia Nepal Humla>LATITUDE 29.85>LONGITUDE 81.93 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Masaki Sano, R Ramesh, MS Sheshshayee, R Sukumar 2012 The Holocene 22 7 809-817 10.1177/0959683611430338 http://journals.sagepub.com/doi/full/10.1177/0959683611430338

A tree-ring d18O chronology of Abies spectabilis from the Nepal Himalaya was established to study hydroclimate in the summer monsoon season over the past 223 years (ad 1778-2000). Response function analysis with ambient climatic records revealed that tree-ring d18O was primarily controlled by the amount of precipitation and relative humidity during the monsoon season (June-September). Since tree-ring d18O was simultaneously correlated with temperature, drought history in the monsoon season was reconstructed by calibrating against the Palmer Drought Severity Index (PDSI). Our reconstruction that accounts for 33.7% of the PDSI variance shows a decreasing trend of precipitation/moisture over the past two centuries, and reduction of monsoon activity can be found across different proxy records from the Himalaya and Tibet. Spatial correlation analysis with global sea surface temperatures suggests that the tropical oceans play a role in modulating hydroclimate in the Nepal Himalaya. Although the dynamic mechanisms of the weakening trend of monsoon intensity still remain to be analyzed, rising sea surface temperatures over the tropical Pacific and Indian Ocean could be responsible for the reduction of summer monsoon. STUDY NOTES: Abies spectabilis tree-ring oxygen isotope (d18O) data from Humla, western Nepal, for the past 220 years. IITRDB26

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/asia/nepal/humla2012d18o.txt Formatted Text Data File; Humla Tree Ring Oxygen Isotope Data USA/NOAA DIF Version 9.8.4 2019-03-01 2019-03-01