Two Hundred Fifty Years of Reconstructed South Asian Summer Monsoon Intensity and Decadal-Scale Variability

dc.contributor.authorBryan, Sean P.
dc.contributor.authorHughen, Konrad A.
dc.contributor.authorKarnauskas, Kristopher B.
dc.contributor.authorFarrar, J. Thomas
dc.contributor.institutionDepartment of Marine Chemistry and GeochemistryWoods Hole Oceanographic Institution Woods Hole MA USA
dc.contributor.institutionNow at Department of GeosciencesColorado State University Fort Collins CO USA
dc.contributor.institutionCooperative Institute for Research in Environmental SciencesUniversity of Colorado Boulder Boulder CO USA
dc.contributor.institutionDepartment of Atmospheric and Oceanic SciencesUniversity of Colorado Boulder Boulder CO USA
dc.contributor.institutionDepartment of Physical OceanographyWoods Hole Oceanographic Institution Woods Hole MA USA
dc.date.accessioned2021-04-12T12:38:35Z
dc.date.available2021-04-12T12:38:35Z
dc.date.issued2019-04-03
dc.description.abstractClimate model simulations of the summer South Asian monsoon predict increased rainfall in response to anthropogenic warming. However, instrumental data show a decline in Indian rainfall in recent decades, underscoring the critical need for additional, independent records of past monsoon variability. Here, we present new reconstructions of annual summer South Asian Monsoon circulation over the past 250 years, based on the geochemical barium-calcium signature of dust present in Red Sea corals. These records reveal how monsoon circulation has evolved with warming climate and indicate a significant multi-century long monsoon intensification, with decreased multidecadal variance. Stronger monsoon circulation would have increased the moisture transport from the Arabian Sea and Bay of Bengal over the Indian subcontinent. If these trends continue, the monsoon circulation and associated moisture transport and precipitation will remain strong and stable for several decades.
dc.description.sponsorshipWe thank Editor Valerie Trouet and two anonymous reviewers for their constructive comments. We gratefully acknowledge Justin Ossolinski for assistance during core drilling; Maureen Auro, Laura Robinson, and Tom Marchitto for use of lab space and for technical advice; Margaret Sulanowska for providing XRD analysis of dust samples; and Sujata Murty and Ryan Davis for assistance in the lab. We thank Falmouth Hospital for use of X-ray equipment. We acknowledge the use of the NSF-supported WHOI ICP-MS facility and thank Scot Birdwhistell for his assistance. This research was supported by grants to K. A. H. from NSF award OCE-1031288 and KAUST award USA00002, and by a WHOI Postdoctoral Fellowship awarded to S. P. B. All data presented in this manuscript will be made publicly available online through the NOAA NCDC Paleoclimatology data archive (https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/).
dc.eprint.versionPost-print
dc.identifier.citationBryan, S. P., Hughen, K. A., Karnauskas, K. B., & Farrar, J. T. (2019). Two Hundred Fifty Years of Reconstructed South Asian Summer Monsoon Intensity and Decadal-Scale Variability. Geophysical Research Letters, 46(7), 3927–3935. doi:10.1029/2018gl081593
dc.identifier.doi10.1029/2018gl081593
dc.identifier.eid2-s2.0-85063937871
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.issue7
dc.identifier.journalGeophysical Research Letters
dc.identifier.pages3927-3935
dc.identifier.urihttp://hdl.handle.net/10754/668697
dc.identifier.volume46
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1029/2018GL081593
dc.rightsArchived with thanks to Geophysical Research Letters
dc.titleTwo Hundred Fifty Years of Reconstructed South Asian Summer Monsoon Intensity and Decadal-Scale Variability
dc.typeArticle
display.details.left<span><h5>Type</h5>Article<br><br><h5>Authors</h5><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0002-9723-4975&spc.sf=dc.date.issued&spc.sd=DESC">Bryan, Sean P.</a> <a href="https://orcid.org/0000-0002-9723-4975" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0003-3201-934X&spc.sf=dc.date.issued&spc.sd=DESC">Hughen, Konrad A.</a> <a href="https://orcid.org/0000-0003-3201-934X" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0001-8121-7321&spc.sf=dc.date.issued&spc.sd=DESC">Karnauskas, Kristopher B.</a> <a href="https://orcid.org/0000-0001-8121-7321" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0003-3495-1990&spc.sf=dc.date.issued&spc.sd=DESC">Farrar, J. Thomas</a> <a href="https://orcid.org/0000-0003-3495-1990" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><br><h5>KAUST Grant Number</h5>USA00002<br><br><h5>Date</h5>2019-04-03</span>
display.details.right<span><h5>Abstract</h5>Climate model simulations of the summer South Asian monsoon predict increased rainfall in response to anthropogenic warming. However, instrumental data show a decline in Indian rainfall in recent decades, underscoring the critical need for additional, independent records of past monsoon variability. Here, we present new reconstructions of annual summer South Asian Monsoon circulation over the past 250 years, based on the geochemical barium-calcium signature of dust present in Red Sea corals. These records reveal how monsoon circulation has evolved with warming climate and indicate a significant multi-century long monsoon intensification, with decreased multidecadal variance. Stronger monsoon circulation would have increased the moisture transport from the Arabian Sea and Bay of Bengal over the Indian subcontinent. If these trends continue, the monsoon circulation and associated moisture transport and precipitation will remain strong and stable for several decades.<br><br><h5>Citation</h5>Bryan, S. P., Hughen, K. A., Karnauskas, K. B., & Farrar, J. T. (2019). Two Hundred Fifty Years of Reconstructed South Asian Summer Monsoon Intensity and Decadal-Scale Variability. Geophysical Research Letters, 46(7), 3927–3935. doi:10.1029/2018gl081593<br><br><h5>Acknowledgements</h5>We thank Editor Valerie Trouet and two anonymous reviewers for their constructive comments. We gratefully acknowledge Justin Ossolinski for assistance during core drilling; Maureen Auro, Laura Robinson, and Tom Marchitto for use of lab space and for technical advice; Margaret Sulanowska for providing XRD analysis of dust samples; and Sujata Murty and Ryan Davis for assistance in the lab. We thank Falmouth Hospital for use of X-ray equipment. We acknowledge the use of the NSF-supported WHOI ICP-MS facility and thank Scot Birdwhistell for his assistance. This research was supported by grants to K. A. H. from NSF award OCE-1031288 and KAUST award USA00002, and by a WHOI Postdoctoral Fellowship awarded to S. P. B. All data presented in this manuscript will be made publicly available online through the NOAA NCDC Paleoclimatology data archive (https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/).<br><br><h5>Publisher</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.publisher=American Geophysical Union (AGU),equals">American Geophysical Union (AGU)</a><br><br><h5>Journal</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.journal=Geophysical Research Letters,equals">Geophysical Research Letters</a><br><br><h5>DOI</h5><a href="https://doi.org/10.1029/2018gl081593">10.1029/2018gl081593</a><br><br><h5>Additional Links</h5>https://onlinelibrary.wiley.com/doi/abs/10.1029/2018GL081593</span>
kaust.grant.numberUSA00002
orcid.authorBryan, Sean P.::0000-0002-9723-4975
orcid.authorHughen, Konrad A.::0000-0003-3201-934X
orcid.authorKarnauskas, Kristopher B.::0000-0001-8121-7321
orcid.authorFarrar, J. Thomas::0000-0003-3495-1990
orcid.id0000-0003-3495-1990
orcid.id0000-0001-8121-7321
orcid.id0000-0003-3201-934X
orcid.id0000-0002-9723-4975
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