East Rongbuk Glacier - 1,000 Year Geochemical Data Kaspari, S.; Mayewski, P.A.; Kang, S.; Sneed, S.; Hou, S.; Hooke, R.; Kreutz, K.J.; Introne, D.S.; Handley, M.; Maasch, K.A.; Qin, D.; Ren, J. Kaspari, S. Mayewski, P.A. Kang, S. Sneed, S. Hou, S. Hooke, R. Kreutz, K.J. Introne, D.S. Handley, M. Maasch, K.A. Qin, D. Ren, J. Monsoon earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (chloride,bulk ice,null,microgram per liter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (calcium,bulk ice,null,microgram per liter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 2H,bulk ice,null,per mil SMOW,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (chloride,bulk ice,null,unspecified unit,null,ice cores,null,null,N,marine) earth science/paleoclimate/ice core earth science/paleoclimate/ice core (East Rongbuk Glacier>LATITUDE 27.98>LONGITUDE 86.92) A highly resolved Mt. Everest ice core reveals a decrease in marine and increase in continental air masses related to relatively high summer surface pressure over Mongolia, and reduction in northward incursions of the summer South Asian monsoon since ~1400 AD. Previously published proxy records from lower sites south of theHimalayas indicate strengthening of the monsoon since this time. These regional differences are consistent with a south–north seesaw in convective activity in the Asian monsoon region, and reflect a southward shift in the mean summer position of the monsoon trough since~1400 AD. The change in monsoonal circulation at 1400 AD is synchronous with a reduction in solar irradiance and the onset of the LIA. This demonstrates a hemispheric scale circulation reorganization at this time, and the potential for future large shifts in monsoonal circulation. STUDY NOTES: High resolution (5 year) Ca, Cl and dD data from the 2002 Mt. Everest East Rongbuk Glacier col ice core. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kaspari, S. Investigator : Mayewski, P.A. Investigator : Kang, S. Investigator : Sneed, S. Investigator : Hou, S. Investigator : Hooke, R. Investigator : Kreutz, K.J. Investigator : Introne, D.S. Investigator : Handley, M. Investigator : Maasch, K.A. Investigator : Qin, D. Investigator : Ren, J. 2008-09-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6180 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/everest/rongbuk2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/everest/rongbuk2007.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/everest/rongbuk2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/everest/rongbuk2007.txt English https://www.ncdc.noaa.gov/paleo/study/6180 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/everest/rongbuk2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/everest/rongbuk2007.txt Kaspari, S., P. Mayewski, S. Kang, S. Sneed, S. Hou, R. Hooke, K. Kreutz, D. Introne, M. Handley, K. Maasch, D. Qin, and J. Ren. 2007. Reduction in northward incursions of the South Asian monsoon since ~1400 AD inferred from a Mt. Everest ice core. Geophys. Res. Lett., 34, L16701, doi:10.1029/2007GL030440. START YEAR: 997 AD * END YEAR: 1997 AD 86.92 27.98 86.92 27.98