noaa-recon-23130 Southern Annular Mode 1,000 Year Reconstructions Dätwyler, C.; Neukom, R.; Abram, N.J.; Gallant, A.J.E.; Grosjean, M.; Jacques-Coper, M.; Karoly, D.J.; Villalba, R. Southern Annular Mode 1,000 Year Reconstructions 2017-12-05 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23130 Investigator C. Dätwyler Investigator R. Neukom Investigator N.J. Abram Investigator A.J.E. Gallant Investigator M. Grosjean Investigator M. Jacques-Coper Investigator D.J. Karoly Investigator R. Villalba earth science paleoclimate climate reconstructions Southern Annular Mode,multiple proxies,null,dimensionless,Dec-Feb,climate reconstructions,null,null,N,ensemble median earth science paleoclimate climate reconstructions Southern Annular Mode,multiple proxies,null,dimensionless,annual,climate reconstructions,null,null,N,ensemble median earth science paleoclimate instrumental Southern Annular Mode,null,null,dimensionless,annual,instrumental,filtered,null,N,null earth science paleoclimate instrumental Southern Annular Mode,null,null,dimensionless,Dec-Feb,instrumental,null,null,N,null earth science paleoclimate climate reconstructions Southern Annular Mode,multiple proxies,null,dimensionless,Dec-Feb,climate reconstructions,filtered,null,N,ensemble median; 30 year filtered earth science paleoclimate climate reconstructions Southern Annular Mode,multiple proxies,ensemble member,dimensionless,Dec-Feb,climate reconstructions,null,null,N,null earth science paleoclimate climate reconstructions Southern Annular Mode,multiple proxies,null,dimensionless,annual,climate reconstructions,filtered,null,N,ensemble median; 30 year filtered earth science paleoclimate instrumental Southern Annular Mode,null,null,dimensionless,annual,instrumental,null,null,N,null earth science paleoclimate climate reconstructions age,null,null,year Common Era,null,climate reconstructions,null,null,N,null earth science paleoclimate instrumental Southern Annular Mode,null,null,dimensionless,Dec-Feb,instrumental,filtered,null,N,30 year filtered earth science paleoclimate reconstructions atmospheric circulation geoscientificInformation Atmospheric and Oceanic Circulation Patterns Reconstruction 1000 AD 2005 AD 950 cal yr BP -55 cal yr BP Complete -90 -30 180 -180 Geographic Region Southern Hemisphere Southern Hemisphere Extratropics>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 Christoph Dätwyler, Raphael Neukom, Nerilie J. Abram, Ailie J.E. Gallant, Martin Grosjean, Martín Jacques-Coper, David J. Karoly, Ricardo Villalba 2017 Climate Dynamics 10.1007/s00382-017-4015-0 https://link.springer.com/article/10.1007%2Fs00382-017-4015-0

The Southern Annular Mode (SAM) is the leading mode of atmospheric interannual variability in the Southern Hemisphere (SH) extra-tropics. Here, we assess the stationarity of SAM spatial correlations with instrumental and paleoclimate proxy data for the past millennium. The instrumental period shows that temporal non-stationarities in SAM teleconnections are not consistent across the SH land areas. This suggests that the influence of the SAM index is modulated by regional effects. However, within key-regions with good proxy data coverage (South America, Tasmania, New Zealand), teleconnections are mostly stationary over the instrumental period. Using different stationarity criteria for proxy record selection, we provide new austral summer and annual mean SAM index reconstructions over the last millennium. Our summer SAM reconstructions are very robust to changes in proxy record selection and the selection of the calibration period, particularly on the multi-decadal timescale. In contrast, the weaker performance and lower agreement in the annual mean SAM reconstructions point towards changing teleconnection patterns that may be particularly important outside the summer months. Our results clearly portend that the temporal stationarity of the proxy-climate relationships should be taken into account in the design of comprehensive regional and hemispherical climate reconstructions. The summer SAM reconstructions show no significant relationship to solar, greenhouse gas and volcanic forcing, with the exception of an extremely strong negative anomaly following the AD 1257 Samalas eruption. Furthermore, reconstructed pre-industrial summer SAM trends are very similar to trends obtained by model control simulations. We find that recent trends in the summer SAM lie outside the 5-95% range of pre-industrial natural variability.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/datwyler2017/readme-datwyler2017.txt Data Description; Southern Annular Mode Reconstructions Readme File GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/datwyler2017/ Data Folder; Southern Annular Mode Index Reconstructions USA/NOAA DIF Version 9.8.4 2019-05-06 2019-05-06