noaa-recon-25050 Tropical Belt 800 Year Early Spring Northern Boundary Reconstruction Alfaro-Sánchez, R.; Nguyen, H.; Klesse, S.; Hudson, A.R.; Belmecheri, S.; Köse, N.; Diaz, H.F.; Monson, R.K.; Villalba, R.; Trouet, V. Tropical Belt 800 Year Early Spring Northern Boundary Reconstruction 2018-10-09 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25050 Investigator R. Alfaro-Sánchez Investigator H. Nguyen Investigator S. Klesse Investigator A.R. Hudson Investigator S. Belmecheri Investigator N. Köse Investigator H.F. Diaz Investigator R.K. Monson Investigator R. Villalba Investigator V. Trouet earth science paleoclimate climate reconstructions|tree ring age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate instrumental Hadley circulation index,null,null,degree north,Feb-Apr,instrumental,null,null,N,northern extent of Hadley circulation; Twentieth Century Reanalysis earth science paleoclimate climate reconstructions|tree ring Hadley circulation index,ring width,one standard error upper bound,degree north,Feb-Apr,climate reconstructions|tree ring,null,regression analysis,N,northern boundary of the tropical belt; error includes analytical and calibration uncertainty earth science paleoclimate climate reconstructions|tree ring Hadley circulation index,ring width,null,degree north,Feb-Apr,climate reconstructions|tree ring,null,regression analysis,N,northern boundary of the tropical belt earth science paleoclimate climate reconstructions|tree ring Hadley circulation index,ring width,one standard error lower bound,degree north,Feb-Apr,climate reconstructions|tree ring,null,regression analysis,N,northern boundary of the tropical belt; error includes analytical and calibration uncertainty earth science paleoclimate reconstructions atmospheric circulation geoscientificInformation Atmospheric and Oceanic Circulation Patterns Reconstruction 1203 AD 2003 AD 747 cal yr BP -53 cal yr BP Complete 0 90 -180 180 Geographic Region Northern Hemisphere Northern Hemisphere>LATITUDE >LONGITUDE 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 R. Alfaro-Sánchez, H. Nguyen, S. Klesse, A. Hudson, S. Belmecheri, N. Köse, H.F. Diaz, R.K. Monson, R. Villalba, V. Trouet 2018 Nature Geoscience 10.1038/s41561-018-0242-1

Northern Hemisphere to reconstruct the movement of the northern boundary of the early spring tropical belt over the past 800 years (1203-2003 AD). Our reconstruction explains 45% of the interannual variance in the latitudinal extent of the Hadley circulation, a metric of the position of the tropical belt boundary. We find that the tropical belt contracted (expanded) during positive (negative) phases of the El Niño Southern Oscillation and Pacific North American teleconnection patterns. The tropical belt also contracted significantly following major volcanic events that injected sulfur into the stratosphere. The longest period of persistent tropical belt expansion occurred in the late sixteenth century, during one of the coldest periods of the Little Ice Age. Our results warn of potential socio-economic consequences of future variations in tropical belt width driven by natural climate variability or stratospheric aerosol injections, whether volcanic or artificial. STUDY NOTES: Tree-ring based reconstruction of the Tropical belt northern boundary position in early spring (February to April)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/alfaro-sanchez2018trop-belt.txt NOAA Template File; Tropical Belt Early Spring Northern Boundary Position Reconstruction USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11