noaa-lake-22416 Rebecca Lagoon, Tasmania 3,700 Year Sediment Reflectance and Precipitation Reconstruction Saunders, K.M.; Kamenik, C.; Hodgson, D.A.; Hunziker, S.; Siffert, L.; Fischer, D.; Fujak, M.; Gibson, J.A.E.; Grosjean, M. Rebecca Lagoon, Tasmania 3,700 Year Sediment Reflectance and Precipitation Reconstruction 2017-07-10 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22416 Investigator K.M. Saunders Investigator C. Kamenik Investigator D.A. Hodgson Investigator S. Hunziker Investigator L. Siffert Investigator D. Fischer Investigator M. Fujak Investigator J.A.E. Gibson Investigator M. Grosjean earth science paleoclimate climate reconstructions|paleolimnology precipitation,null,null,millimeter per year,annual,climate reconstructions|paleolimnology,filtered,null,N,Relationship based on correlation of sediment reflectance with Instrumental records 1911-2000; 51 year filter; R= -0.56 P auto < 0.001 RMSEP = 43.0 mm/year earth science paleoclimate paleolimnology reflectance,sediment,null,dimensionless,null,paleolimnology,null,spectrophotometry,N,Ratio between reflectance at 660 and 670 nm wavelength - degree of diagenesis; Relationship based on correlation with Instrumental records 1911-2000 earth science paleoclimate paleolimnology reflectance,sediment,null,dimensionless,null,paleolimnology,null,spectrophotometry,N,Ratio between reflectance at 660 and 670 nm wavelength - degree of diagenesis earth science paleoclimate climate reconstructions|paleoceanography precipitation,null,null,millimeter per year,annual,climate reconstructions|paleoceanography,filtered,null,N,based on sediment reflectance; R= -0.56 P auto < 0.001 RMSEP = 43.0 mm/year; Relationship based on correlation with Instrumental records 1911-2000; 51 year filter earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate climate reconstructions|paleolimnology age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate climate reconstructions|paleolimnology age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography depth,null,null,centimeter,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleolimnology age,null,null,year Common Era,null,paleolimnology,null,null,N,null earth science paleoclimate climate reconstructions|paleolimnology precipitation,null,null,millimeter per year,annual,climate reconstructions|paleolimnology,filtered,null,N,Relationship based on correlation of sediment reflectance with Instrumental records 1911-2000; 5 year filter; R= -0.56 P auto < 0.001 RMSEP = 43.0 mm/year earth science paleoclimate climate reconstructions|paleoceanography age,null,null,year Common Era,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography precipitation,null,null,millimeter per year,annual,climate reconstructions|paleoceanography,filtered,null,N,based on sediment reflectance; R= -0.56 P auto < 0.001 RMSEP = 43.0 mm/year; 5 year filter earth science paleoclimate climate reconstructions|paleoceanography age,null,null,calendar year before present,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology reconstruction earth science paleoclimate paleolimnology physical properties geoscientificInformation Precipitation Reconstruction 3654 cal yr BP -58 cal yr BP Complete -41.183 -41.183 144.683 144.683 8 8 Continent Australia/New Zealand Australia Tasmania Rebecca Lagoon>LATITUDE -41.183>LONGITUDE 144.683 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 Saunders, K.M.; Kamenik, C.; Hodgson, D.A.; Hunziker, S.; Siffert, L.; Fischer, D.; Fujak, M.; Gibson, J.A.E.; Grosjean, M. 2012 Global and Planetary Change 92-93 82-91 10.1016/j.gloplacha.2012.04.005 http://www.sciencedirect.com/science/article/pii/S0921818112000616

Accurate projections of future climate changes in regions susceptible to drought depend on a good understanding of past climate changes and the processes driving them. In the absence of longer term instrumental data, paleoclimate data are needed. In this study we develop a precipitation reconstruction for Rebecca Lagoon (41 11'S, 144 41'E), northwest Tasmania. First, the relationship between scanning reflectance spectroscopy measurements of sediment cores in the visible spectrum (380-730 nm) and instrumental precipitation record (1912-2009) was used to develop a model to reconstruct precipitation back in time. Results showed that the ratio of reflectance between 660 and 670 nm (i.e., reflectance at 660 nm/reflectance at 670 nm; a measure of pigment diagenesis) was significantly related to annual precipitation. A calibration model was developed (R = -0.56, pauto < 0.001, RMSEP = 43.0 mm yr- 1, 5 year triangular filtered data, calibration period 1912-2009). Second, this calibration-in-time model was used to reconstruct late Holocene precipitation changes over the last ~ 3000 years. This showed relatively dry conditions from ca. 3100-2800 cal yr BP, wet conditions from ca. 2800-2400 cal yr BP, dry conditions from ca. 2400-2000 calyr BP, and variable conditions after this. Relatively wet conditions occurred from ca. 500 cal yr BP to the late AD 1800 s (ca. 50 cal. yr BP). The precipitation reconstruction indicates that conditions were relatively dry for the 20th century compared to the last ~ 3000 years. In particular, the dry period measured in recent decades is one of the most intense in at least the last 500 years. As precipitation in this region is primarily driven by the Southern Hemisphere westerly winds, these changes are discussed in terms of shifts in westerly wind strength and/or position. STUDY NOTES: Sediment reflectance data from Rebecca Lagoon, Tasmania, plus precipitation reconstructions spanning the past 3,700 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/rebecca2012refl.txt Formatted Text Data File; Rebecca Lagoon Sediment Reflectance Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/rebecca2012precip.txt Formatted Text Data File; Rebecca Lagoon Precipitation Reconstructions USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11