noaa-lake-21111 Ngamring Tso, Tibet 4,100 Year Sediment Data and Precipitation Reconstruction Conroy, J.L.; Hudson, A.M.; Overpeck, J.T.; Liu, K.-B.; Wang, L.; Cole, J.E. Ngamring Tso, Tibet 4,100 Year Sediment Data and Precipitation Reconstruction 2016-12-21 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/21111 Investigator J.L. Conroy Investigator A.M. Hudson Investigator J.T. Overpeck Investigator K.-B. Liu Investigator L. Wang Investigator J.E. Cole earth science paleoclimate climate reconstructions|paleolimnology precipitation,null,95% confidence interval upper bound,millimeter per day,Jun-Sep,climate reconstructions|paleolimnology,anomalized,null,N,based on grain size earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 0.363078 to 0.416869 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 5.011872 to 5.754399 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 26.30268 to 30.199517 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 30.199517 to 34.673685 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 45.708819 to 52.480746 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 120.226443 to 138.038426 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 275.42287 to 316.227766 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 363.078055 to 416.869383 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 478.630092 to 549.540874 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 724.43596 to 831.763771 microns earth science paleoclimate paleolimnology manganese,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 0.275423 to 0.316228 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 3.801894 to 4.365158 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 6.606934 to 7.585776 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 8.7096363 to 10.0000 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 19.952623 to 22.908677 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 39.810717 to 45.708819 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 138.038426 to 158.489319 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 181.970086 to 208.929613 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 239.883292 to 275.42287 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1258.925412 to 1445.439771 microns earth science paleoclimate paleolimnology aluminum,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology iron,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate climate reconstructions|paleolimnology precipitation,null,95% confidence interval lower bound,millimeter per day,Jun-Sep,climate reconstructions|paleolimnology,anomalized,null,N,based on grain size earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology principal component,null,null,dimensionless,null,paleolimnology,null,null,N,grain size Principal Component 1 earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 0.47863 to 0.549541 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1.096478 to 1.258925 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1.258925 to 1.44544 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 13.182567 to 15.135612 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 630.957344 to 724.43596 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1659.586907 to 1905.460718 microns earth science paleoclimate climate reconstructions|paleolimnology precipitation,null,null,millimeter per day,Jun-Sep,climate reconstructions|paleolimnology,anomalized,null,N,based on grain size earth science paleoclimate paleolimnology principal component,null,null,dimensionless,null,paleolimnology,null,null,N,grain size Principal Component 2 earth science paleoclimate paleolimnology grain size median,sediment,null,micrometer,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 0.316228 to 0.363078 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 7.585776 to 8.709636 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 10.0000 to 11.481536 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 208.929613 to 239.883292 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 416.869383 to 478.630092 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1445.439771 to 1659.586907 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1905.460718 to 2187.761624 microns earth science paleoclimate climate reconstructions|paleolimnology age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,composite age earth science paleoclimate paleolimnology principal component,null,null,dimensionless,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,PC#1 elemental abundances earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 0.630957 to 0.724436 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 2.187762 to 2.511886 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 17.378008 to 19.952623 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 22.908677 to 26.30268 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 34.673685 to 39.810717 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 91.201084 to 104.712855 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 831.763771 to 954.992586 microns earth science paleoclimate paleolimnology depth,null,null,millimeter,null,paleolimnology,null,null,N,composite depth earth science paleoclimate paleolimnology chlorine,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth 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class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 4.365158 to 5.011872 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 52.480746 to 60.255959 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 549.540874 to 630.957344 microns earth science paleoclimate paleolimnology potassium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology rubidium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology strontium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 0.954993 to 1.096478 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1.905461 to 2.187762 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 2.511886 to 2.884031 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 3.311311 to 3.801894 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 5.754399 to 6.606934 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 11.481536 to 13.182567 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 60.255959 to 69.183097 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 79.432823 to 91.201084 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 104.712855 to 120.226443 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 158.489319 to 181.970086 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 954.992586 to 1096.478196 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1096.478196 to 1258.925412 microns earth science paleoclimate climate reconstructions|paleolimnology depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology titanium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 0.724436 to 0.831764 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 1.659587 to 1.905461 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 15.135612 to 17.378008 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 69.183097 to 79.432823 microns earth science paleoclimate paleolimnology grain size class,sediment,null,volume percent,null,paleolimnology,null,null,N,grain size 316.227766 to 363.078055 microns earth science paleoclimate paleolimnology organic matter,sediment,null,weight percent,null,paleolimnology,null,null,N,Loss on Ignition at 550C earth science paleoclimate paleolimnology principal component,null,null,dimensionless,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,PC #2 elemental abundances earth science paleoclimate paleolimnology silicon,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology reconstruction earth science paleoclimate paleolimnology physical properties earth science paleoclimate paleolimnology geochemistry geoscientificInformation Monsoon Precipitation Reconstruction 4113 cal yr BP -57 cal yr BP Complete 29.3 29.3 87.2 87.2 Continent Asia Eastern Asia China Ngamring Tso>LATITUDE 29.3>LONGITUDE 87.2 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 Jessica L. Conroy, Adam M. Hudson, Jonathan T. Overpeck, Kam-Biu Liu, Luo Wang, Julia E. Cole 2017 Earth and Planetary Science Letters 458 357-348 10.1016/j.epsl.2016.10.044 http://www.sciencedirect.com/science/article/pii/S0012821X16306094

The nature of multidecadal to centennial variability of the Asian monsoon is largely unknown, hindering our understanding of how the modern precipitation regime compares to preindustrial variability, as well as how the Asian monsoon may change in coming decades. Here we use the sediment record from a closed-basin lake in southern Tibet, Ngamring Tso, along with other published paleoclimatic records, to assess summer monsoon precipitation variability over the 20th century and during the late Holocene (4100 cal yr BP to present). The first principal component of the Ngamring Tso grain size record, which is highly correlated with median grain size, correlates significantly with observed summer (June-September) precipitation. From CE 1940 to 2007, grain size decreased with increasing summer precipitation and increased with decreasing summer precipitation. Satellite images of Ngamring Tso reveal larger lake area in the 1970s and 2000s and smaller lake area in the 1980s and 1990s, suggesting monsoon precipitation-induced changes in lake depth or area likely govern grain size variability. In the context of the last 4100 yr, prolonged periods of relatively weak summer monsoon precipitation occurred from 2800-2600 cal yr BP, 2500-2300 cal yr BP, and 1600-400 cal yr BP. A trend toward increased summer precipitation began around 1000 cal yr BP, with above-average summer precipitation from 400 cal yr BP to present, peaking between 200-100 cal yr BP (CE 1750-1850). Dry and wet periods are coincident with dry and wet periods in other south-central Tibetan lake sediment records that reflect precipitation or moisture balance, and with regional proxies of the ISM and EASM, indicating south-central Tibet is influenced by both monsoon subsystems. However, western Tibet lake sediment records do not covary with the Ngamring Tso record, suggesting the spatial variability in Tibet precipitation that occurs on interannual timescales today may also characterize precipitation on multidecadal and centennial timescales during the late Holocene. 20th century precipitation variability in southern Tibet falls within the range of natural variability in the last 4100 yr, and does not show a clear trend of increasing precipitation as projected by models. Instead, it appears that poorly understood multidecadal to centennial internal modes of monsoon variability remained influential throughout the last 4100 yr. Thus, substantial multidecadal to centennial-scale hydroclimatic variability will complicate our ability to project and prepare for anthropogenic changes in the region's monsoon precipitation. STUDY NOTES: Sediment physical properties (grain size, loss-on-ignition) and geochemical (elemental composition) data from sediments collected in Ngamring Tso, Tibet, plus summer monsoon (June-September) precipitation reconstruction, covering the past 4,100 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ngamringtso2017xrf.txt Formatted Text Data File; Ngamring Tso XRF Elemental Composition Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ngamringtso2017precip.txt Formatted Text Data File; Ngamring Tso Precipitation Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ngamringtso2017loi.txt Formatted Text Data File; Ngamring Tso Loss-On-Ignition Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ngamringtso2017gs.txt Formatted Text Data File; Ngamring Tso Grain Size Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11