noaa-cave-23870 Xianglong Cave, China 6,650 year Speleothem Stable Isotope Data Tan, L.; Cai, Y.; Cheng, H.; Edwards, R.L.; Gao, Y.; Xu, H.; Zhang, H.; An, Z. Xianglong Cave, China 6,650 year Speleothem Stable Isotope Data 2018-04-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23870 Investigator L. Tan Investigator Y. Cai Investigator H. Cheng Investigator R.L. Edwards Investigator Y. Gao Investigator H. Xu Investigator H. Zhang Investigator Z. An earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,null,null,N,null earth science paleoclimate speleothems sample identification,null,null,null,null,speleothems,null,null,C,StalagmiteID earth science paleoclimate speleothems age,null,null,calendar year before present,null,speleothems,null,null,N,null earth science paleoclimate speleothems growth rate,calcium carbonate,null,millimeter per year,null,speleothems,null,null,N,null earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 6651 cal yr BP 653 cal yr BP Complete 32.9975 32.9975 106.3281 106.3281 940 940 Continent Asia Eastern Asia China Xianglong Cave>LATITUDE 32.9975>LONGITUDE 106.3281 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 Liangcheng Tan, Yanjun Cai, Hai Cheng, R. Lawrence Edwards, Yongli Gao, Hai Xu, Haiwei Zhang, Zhisheng An 2018 Earth and Planetary Science Letters 482 580-590 10.1016/j.epsl.2017.11.044 https://www.sciencedirect.com/science/article/pii/S0012821X1730688X

The upper Hanjiang River region is the recharge area of the middle route of South-to-North Water Transfer Project. The region is under construction of the Hanjiang-Weihe River Water Transfer Project in China. Monsoon precipitation variations in this region are critical to water resource and security of China. In this study, high-resolution monsoon precipitation variations were reconstructed in the upper Hanjiang River region over the past 6650 years from d18O and d13C records of four stalagmites in Xianglong cave. The long term increasing trend of stalagmite d18O record since the middle Holocene is consistent with other speleothem records from monsoonal China. This trend follows the gradually decreasing Northern Hemisphere summer insolation, which indicates that solar insolation may control the orbital-scale East Asian summer monsoon (EASM) variations. Despite the declined EASM intensity since the middle Holocene, local precipitation may not have decreased remarkably, as revealed by the d13C records. A series of centennial- to decadal-scale cyclicity was observed, with quasi-millennium-, quasi-century-, 57-, 36- and 22-year cycles by removing the long-term trend of stalagmite d18O record. Increased monsoon precipitation during periods of 4390-3800 a BP, 3590-2960 a BP, 2050-1670 a BP and 1110–790 a BP had caused four super-floods in the upper reach of Hanjiang River. Dramatically dry climate existed in this region during the 5.0 ka and 2.8 ka events, coinciding with notable droughts in other regions of monsoonal China. Remarkably intensified and southward Westerly jet, together with weakened summer monsoon, may delay the onset of rainy seasons, resulting in synchronous decreasing of monsoon precipitation in China during the two events. During the 4.2 ka event and the Little Ice Age, the upper Hanjiang River region was wet, which was similar to the climate conditions in central and southern China, but was the opposite of drought observed in northern China. We propose that weakened summer monsoon and less strengthened or normal Westerly jet may cause rain belt stay longer in the southward region, which reduced rainfall in northern China but enhanced it in central and southern China. STUDY NOTES: Speleothem oxygen and carbon isotope records from Xianglong Cave, upper Hanjiang River region over the last 6650 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/xianglong2018.txt NOAA Template File; Xianglong Cave Stable Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11