noaa-recon-22031 1200 Year Atlantic Multidecadal Variability and Atlantic Multidecadal Oscillation Reconstructions Wang, J.L.; Yang, B.; Ljungqvist, F.C.; Luterbacher, J.; Osborn, T.J.; Briffa, K.R.; Zorita, E. 1200 Year Atlantic Multidecadal Variability and Atlantic Multidecadal Oscillation Reconstructions 2017-05-29 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22031 Investigator J.L. Wang Investigator B. Yang Investigator F.C. Ljungqvist Investigator J. Luterbacher Investigator T.J. Osborn Investigator K.R. Briffa Investigator E. Zorita earth science paleoclimate climate reconstructions Atlantic Multidecadal Oscillation Index,multiple proxies,null,degree Celsius,May-Sep,climate reconstructions,anomalized|filtered,principal component analysis|regression analysis,N,w.r.t 1856-1967; 30-year low-pass filter earth science paleoclimate climate reconstructions Atlantic Multidecadal Variability Index,multiple proxies,null,degree Celsius,May-Sep,climate reconstructions,anomalized,principal component analysis|regression analysis,N,w.r.t 1856-1967 earth science paleoclimate climate reconstructions Atlantic Multidecadal Variability Index,multiple proxies,one root mean square error lower bound,degree Celsius,May-Sep,climate reconstructions,anomalized,principal component analysis|regression analysis,N,w.r.t 1856-1967 earth science paleoclimate climate reconstructions Atlantic Multidecadal Variability Index,multiple proxies,null,degree Celsius,May-Sep,climate reconstructions,anomalized|filtered,principal component analysis|regression analysis,N,w.r.t 1856-1967; 30-year low-pass filter earth science paleoclimate climate reconstructions age,null,null,year Common Era,null,climate reconstructions,null,null,N,null earth science paleoclimate climate reconstructions Atlantic Multidecadal Variability Index,multiple proxies,one root mean square error upper bound,degree Celsius,May-Sep,climate reconstructions,anomalized,principal component analysis|regression analysis,N,w.r.t 1856-1967 earth science paleoclimate reconstructions atmospheric circulation earth science paleoclimate reconstructions sea surface temperature geoscientificInformation Atmospheric and Oceanic Circulation Patterns Reconstruction 800 AD 2010 AD 1150 cal yr BP -60 cal yr BP Complete 0 70 -80 0 Ocean Atlantic Ocean North Atlantic Ocean North Atlantic Ocean>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 Jianglin Wang, Bao Yang, Fredrik Charpentier Ljungqvist, Jürg Luterbacher, Timothy J. Osborn, Keith R. Briffa, Eduardo Zorita 2017 Nature Geoscience 10.1038/ngeo2962 https://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo2962.html

The North Atlantic experiences climate variability on multidecadal scales, which is sometimes referred to as Atlantic multidecadal variability. However, the relative contributions of external forcing such as changes in solar irradiance or volcanic activity and internal dynamics to these variations are unclear. Here we provide evidence for persistent summer Atlantic multidecadal variability from AD 800 to 2010 using a network of annually resolved terrestrial proxy records from the circum-North Atlantic region. We find that large volcanic eruptions and solar irradiance minima induce cool phases of Atlantic multidecadal variability and collectively explain about 30% of the variance in the reconstruction on timescales greater than 30 years. We are then able to isolate the internally generated component of Atlantic multidecadal variability, which we define as the Atlantic multidecadal oscillation. We find that the Atlantic multidecadal oscillation is the largest contributor to Atlantic multidecadal variability over the past 1,200 years. We also identify coherence between the Atlantic multidecadal oscillation and Northern Hemisphere temperature variations, leading us to conclude that the apparent link between Atlantic multidecadal variability and regional to hemispheric climate does not arise solely from a common response to external drivers, and may instead reflect dynamic processes. STUDY NOTES: Summer (May-September) Atlantic Multidecadal Variability (AMV) was reconstructed by applying the principal component regression method to 46 annually-resolved terrestrial proxy records from the circum-North Atlantic region.The internal variability component of Atlantic Multidecadal Variability (i.e., Atlantic Multidecadal Oscillation; AMO) was estimated by empirically removing externally-forced variations at multidecadal (> 30 years) timescales. Data are reported as sea surface temperature anomalies with respect to AD 1856-1973.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/wang2017/wang2017amv-amo.txt Formatted Text Data File; Atlantic Multidecadal Variability and Atlantic Multidecadal Oscillation Reconstructions USA/NOAA DIF Version 9.8.4 2019-04-11 2019-04-11