noaa-recon-23350 Summer North Atlantic Jet (NAJ) reconstruction from 1725-2012 CE Trouet, V.; Babst, F.; Meko, M. Summer North Atlantic Jet (NAJ) reconstruction from 1725-2012 CE 2018-01-25 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23350 Investigator V. Trouet Investigator F. Babst Investigator M. Meko 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 climate reconstructions|tree ring jet stream position,null,one standard error upper bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring jet stream position,null,two standard error upper bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate instrumental jet stream position,null,null,degree north,Aug,instrumental,null,null,N,Twentieth Century Reanalysis; instrumental latitudinal position earth science paleoclimate climate reconstructions|tree ring jet stream position,null,one standard error lower bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring jet stream position,null,null,degree north,Aug,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring jet stream position,null,two standard error lower bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate reconstructions atmospheric circulation geoscientificInformation Atmospheric and Oceanic Circulation Patterns Reconstruction 1725 AD 2012 AD 225 cal yr BP -62 cal yr BP Complete 0 90 -30 -10 Ocean Atlantic Ocean North Atlantic Ocean Eastern North Atlantic>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 Trouet, V., F. Babst, and M. Meko 2018 Nature Communications 9 1 180 10.1038/s41467-017-02699-3 https://www.nature.com/articles/s41467-017-02699-3

A recent increase in mid-latitude extreme weather events has been linked to Northern Hemisphere polar jet stream anomalies. To put recent trends in a historical perspective, long-term records of jet stream variability are needed. Here we combine two tree-ring records from the British Isles and the northeastern Mediterranean to reconstruct variability in the latitudinal position of the high-summer North Atlantic Jet (NAJ) back to 1725 CE. We find that northward NAJ anomalies have resulted in heatwaves and droughts in northwestern Europe and southward anomalies have promoted wildfires in southeastern Europe. We further find an unprecedented increase in NAJ variance since the 1960s, which co-occurs with enhanced late twentieth century variance in the Central and North Pacific Basin. Our results suggest increased late twentieth century interannual meridional jet stream variability and support more sinuous jet stream patterns and quasi-resonant amplification as potential dynamic pathways for Arctic warming to influence mid-latitude weather. STUDY NOTES: Tree-ring based reconstruction of the latitudinal position of the North Atlantic Jet Stream in August.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/trouet2018/trouet2018-NAJ.txt NOAA Template File; North Atlantic Jet Reconstruction USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11