noaa-cave-26470 Mawmluh Cave, India 50 Year Speleothem d18O and Trace Element Data Ronay, E.R.; Breitenbach, S.F.M.; Oster, J.L.; Myers, C.G.; Kelley, N.P.; Covey, A.K.; Bennartz, R. Mawmluh Cave, India 50 Year Speleothem d18O and Trace Element Data 2019-03-25 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/26470 Investigator E.R. Ronay Investigator S.F.M. Breitenbach Investigator J.L. Oster Investigator C.G. Myers Investigator N.P. Kelley Investigator A.K. Covey Investigator R. Bennartz earth science paleoclimate speleothems trace metals earth science paleoclimate speleothems oxygen isotopes geoscientificInformation Monsoon 1964 AD 2013 AD -14 cal yr BP -63 cal yr BP Complete 25.2622 25.2622 91.8167 91.8167 1290 1290 Continent Asia Southcentral Asia India Mawmluh Cave>LATITUDE 25.2622>LONGITUDE 91.8167 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 Elli R. Ronay, Sebastian F.M. Breitenbach, Jessica L. Oster 2019 Scientific Reports 9 1 5091 10.1038/s41598-019-41630-2 www.nature.com/articles/s41598-019-41630-2 Christopher G. Myers, Jessica L. Oster, Warren D. Sharp, Ralf Bennartz, Neil P. Kelley, Aaron K. Covey, Sebastian F.M. Breitenbach 2015 Geophysical Research Letters 42 10 4124-4132 10.1002/2015GL063826 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015GL063826

In climates with strongly seasonal rainfall, speleothem-based paleoclimate reconstructions are often thought to reflect wet season conditions, assuming a bias toward the season with greater water supply. This is particularly true in monsoon regions, where speleothem records are interpreted to document monsoon strength changes on multiple timescales. Dry season infiltration variability and rainfall seasonality are not typically considered in these reconstructions, even though cave ventilation could bias speleothem growth toward the cooler season. To investigate the influence of dry season infiltration on speleothem geochemistry, we combine a modern, sub-seasonally resolved trace element record from Mawmluh Cave in Northeast India with forward modeling experiments. We find that variations in the amplitude of seasonal signals in speleothem Mg/Ca, which reflects prior carbonate precipitation, are more sensitive to dry season rather than monsoon season infiltration. This sensitivity may be enhanced by dry season cave ventilation. The Mawmluh speleothem Mg/Ca record is consistent with increased dry season rainfall during the 1976-1998 warm phase of the Pacific Decadal Oscillation relative to 1964-2013. Our work demonstrates the importance of considering non-monsoon season rainfall when interpreting speleothem paleoclimate records and suggests that trace elements could provide insight into periods of enhanced dry season infiltration in monsoonal climates. STUDY NOTES: Trace element ratios (Mg/Ca, Sr/Ca, Ba/Ca, U/Ca) and oxygen isotope (d18O) data at sub-seasonal resolution from stalagmite MAW-0201 collected in Mawmluh Cave, India, for the past 50 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/india/mawmluh2019elem.txt NOAA Template File; Mawmluh Cave Trace Element Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/india/mawmluh2019d18o.txt NOAA Template File; Mawmluh Cave d18O Data USA/NOAA DIF Version 9.8.4 2019-03-28 2019-03-28