{"NOAAStudyId":"23830","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2018-04-09","dataPublisher":"NOAA","dataType":"TREE RING","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/tree-ring","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-tree-23830.xml","doi":"https://doi.org/10.25921/rycp-t207","earliestYearBP":329,"earliestYearCE":1621,"entryId":"noaa-tree-23830","funding":[],"investigators":"Xu, C.; Sano, M.; Dimri, A.P.; Ramesh, R.; Nakatsuka, T.; Shi, F.; Guo, Z.","mostRecentYearBP":-58,"mostRecentYearCE":2008,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/23830","originalSource":null,"publication":[{"abstract":"We have constructed a regional tree-ring cellulose oxygen isotope (d18O) record for the northern Indian sub-continent based on two new records from northern India and central Nepal and three published records from northwestern India, western Nepal and Bhutan. The record spans the common interval from 1743 to 2008CE. Correlation analysis reveals that the record is significantly and negatively correlated with the three regional climatic indices: all India rainfall (AIR; r = -0.5, p < 0.001, n = 138), Indian monsoon index (IMI; r = -0.45, p < 0.001, n = 51) and the intensity of monsoonal circulation (r = -0.42, p < 0.001, n = 51). The close relationship between tree-ring cellulose d18O and the Indian summer monsoon (ISM) can be explained by oxygen isotope fractionation mechanisms. Our results indicate that the regional tree-ring cellulose d18O record is suitable for reconstructing high-resolution changes in the ISM. The record exhibits significant interannual and long-term variations. Interannual changes are closely related to the El Nino-Southern Oscillation (ENSO), which indicates that the ISM was affected by ENSO in the past. However, the ISM-ENSO relationship was not consistent over time, and it may be partly modulated by Indian Ocean sea surface temperature (SST). Long-term changes in the regional tree-ring d18O record indicate a possible trend of weakened ISM intensity since 1820. Decreasing ISM activity is also observed in various high-resolution ISM records from southwest China and Southeast Asia, and may be the result of reduced land-ocean thermal contrasts since 1820CE.","author":{"name":"Chenxi Xu, Masaki Sano, Ashok Priyadarshan Dimri, Rengaswamy Ramesh, Takeshi Nakatsuka, Feng Shi, Zhengtang Guo"},"citation":"Chenxi Xu, Masaki Sano, Ashok Priyadarshan Dimri, Rengaswamy Ramesh, Takeshi Nakatsuka, Feng Shi, Zhengtang Guo. 2018. Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies. Climate of the Past, 14, 653-664. doi: 10.5194/cp-14-653-2018","edition":null,"identifier":{"id":"10.5194/cp-14-653-2018","type":"doi","url":"http://dx.doi.org/10.5194/cp-14-653-2018"},"issue":null,"journal":"Climate of the Past","pages":"653-664","pubRank":"1","pubYear":2018,"reportNumber":null,"title":"Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies","type":"publication","volume":"14"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"57627","geo":{"geoType":"Feature","geometry":{"coordinates":["27.983","32.217","77.217","90"],"type":"POLYGON"},"properties":{"easternmostLongitude":"90","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"32.217","southernmostLatitude":"27.983","westernmostLongitude":"77.217"}},"locationName":"Continent>Asia>Southcentral Asia","mappable":"N","paleoData":[{"NOAADataTableId":"35653","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>tree-ring>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/asia/himalaya2018d18o.txt","linkText":"Southern Himalaya Regional Tree Ring Oxygen Isotope Data","urlDescription":"NOAA Template File","variables":[{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":"anomalized","cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>cellulose","cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"}]}],"dataTableName":"HimalayaH5d18O","dataTableNotes":null,"earliestYear":1621,"earliestYearBP":329,"earliestYearCE":1621,"mostRecentYear":2008,"mostRecentYearBP":-58,"mostRecentYearCE":2008,"species":[],"timeUnit":"AD"}],"siteName":"Southern Himalaya"}],"studyCode":"IITRDB36","studyName":"Southern Himalaya Regional 388 Year Tree Ring Oxygen Isotope Data","studyNotes":"Regional tree-ring cellulose oxygen isotope (d18O) chronology (H5) for the southern Himalaya including data from India, Nepal, and Bhutan. \r\nIITRDB36","version":"1.0","xmlId":"21974"}