noaa-recon-9901 Lago dell'Accesa Italy 11.7-4.6KYr Pollen Climate Reconstructions Finsinger, W.; Colombaroli, D.; De Beaulieu, J.-L.; Valsecchi, V.; Vannière, B.; Vescovi, E.; Chapron, E.; Lotter, A.F.; Magny, M.; Tinner, W. Lago dell'Accesa Italy 11.7-4.6KYr Pollen Climate Reconstructions 2010-09-27 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/9901 Investigator W. Finsinger Investigator D. Colombaroli Investigator J.-L. De Beaulieu Investigator V. Valsecchi Investigator B. Vannière Investigator E. Vescovi Investigator E. Chapron Investigator A.F. Lotter Investigator M. Magny Investigator W. Tinner earth science paleoclimate climate reconstructions|pollen temperature,null,null,degree Celsius,Jan,climate reconstructions|pollen,interpolated|smoothed,null,N,interpolated at 50 yrs steps and loess smoothed (span 0.1) earth science paleoclimate climate reconstructions|pollen age,null,null,calendar year before present,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate climate reconstructions|pollen precipitation,null,null,millimeter,summer,climate reconstructions|pollen,interpolated|smoothed,null,N,interpolated at 50 yrs steps and loess smoothed (span 0.1) earth science paleoclimate reconstructions precipitation earth science paleoclimate reconstructions air temperature geoscientificInformation Air Temperature Reconstruction Precipitation Reconstruction 11500 cal yr BP 4530 cal yr BP Complete 42.9888 42.9888 10.8972 10.8972 157 157 Continent Europe Southern Europe Italy Lago dell'Accesa>LATITUDE 42.9888>LONGITUDE 10.8972 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 Finsinger, W., D. Colombaroli, J.-L. De Beaulieu, V. Valsecchi, B. Vannière, E. Vescovi, E. Chapron, A.F. Lotter, M. Magny, and W. Tinner. 2010. Early to mid-Holocene climate change at Lago dell'Accesa (central Italy): climate signal or anthropogenic bias? Journal of Quaternary Science, DOI: 10.1002/jqs.1402.

Despite the high potential of pollen records for climate reconstruction, pollen-climate relationships may be biased due to past and present human activities on the landscape. We use (i) transfer functions based on modern pollen-climate relationships to infer seasonal temperature and summer precipitation for the period 11 500-4500 cal. a BP and (ii) lake-level change records based on different sedimentary proxies in multiple cores that are mainly indicative for summer hydrology at Lago dell'Accesa (central Italy). Quantitative reconstructions indicate lowest summer precipitation during two phases (8500-7700 cal. a BP and after 6000 cal. a BP) and a gradual winter temperature increase from 11 500 to ca. 8000 cal. a BP. Lowest summer precipitation was reconstructed during these phases characterised by vegetation shifts from open forests dominated by summergreen oaks (Quercus) to forests dominated by evergreen oaks (Quercus ilex), which are at present most abundant where summer drought is stronger. Similarly, the lake-level record indicates two long-lasting low summer precipitation phases (8800-7700 and 6400-4400 cal. a BP) that were interrupted by short-term high summer precipitation events. Based on the broad agreement between the pollen-inferred summer precipitation and the low-frequency lake-level changes, we suggest that the duration of the high summer precipitation events may have been too short to maintain drought-sensitive trees, which may have been affected by high mortality rates when summer dry conditions returned. Although past and modern pollen-climate relationships may very likely have been affected by human activities since the Neolithic (i.e. when exploitation of the landscape started), we reject the hypothesis of a significant anthropogenic bias in the pollen-based climate reconstruction. In addition, we suggest that pollen-based and lake-level reconstructions may have different inherent abilities of capturing high- and low-frequency precipitation signals. STUDY NOTES: Pollen-inferred summer precipitation and January temperature for Lago dell'Accesa, central Italy.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/europe/accesa2010.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/recons/europe/accesa2010.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11