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. Alfaro-Sánchez, R. Nguyen, H. Klesse, S. Hudson, A.R. Belmecheri, S. Köse, N. Diaz, H.F. Monson, R.K. Villalba, R. Trouet, V. Atmospheric and Oceanic Circulation Patterns Reconstruction 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 (Northern Hemisphere>LATITUDE >LONGITUDE ) 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) NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Alfaro-Sánchez, R. Investigator : Nguyen, H. Investigator : Klesse, S. Investigator : Hudson, A.R. Investigator : Belmecheri, S. Investigator : Köse, N. Investigator : Diaz, H.F. Investigator : Monson, R.K. Investigator : Villalba, R. Investigator : Trouet, V. 2018-10-09 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/25050 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/alfaro-sanchez2018trop-belt.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/alfaro-sanchez2018trop-belt.txt English https://www.ncdc.noaa.gov/paleo/study/25050 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/alfaro-sanchez2018trop-belt.txt R. Alfaro-Sánchez, H. Nguyen, S. Klesse, A. Hudson, S. Belmecheri, N. Köse, H.F. Diaz, R.K. Monson, R. Villalba, V. Trouet2018Climatic and volcanic forcing of tropical belt northern boundary over the past 800 yearsNature Geoscience10.1038/s41561-018-0242-1 START YEAR: 1203 AD * END YEAR: 2003 AD -180 0 180 90