noaa-lake-20452 Duckhole Lake, Tasmania 950 Year Sediment Reflectance and Temperature Reconstruction Saunders, K.M.; Grosjean, M.; Hodgson, D.A. Duckhole Lake, Tasmania 950 Year Sediment Reflectance and Temperature Reconstruction 2016-08-29 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20452 Investigator K.M. Saunders Investigator M. Grosjean Investigator D.A. Hodgson earth science paleoclimate climate reconstructions|paleolimnology surface temperature,null,null,degree Celsius,annual,climate reconstructions|paleolimnology,filtered,null,N,based on sediment reflectance; 5 year filtered; calibrated model: R=-0.56 pauto<0.05 0.21C root mean squared error 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 paleolimnology age,null,null,year Common Era,null,paleolimnology,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 reflectance,sediment,null,dimensionless,null,paleolimnology,null,spectrophotometry,N,Trough area between 650 and 700 nm wavelength=Relative concentration of chlorins earth science paleoclimate paleolimnology reconstruction earth science paleoclimate paleolimnology physical properties geoscientificInformation Air Temperature Reconstruction 1067 AD 2008 AD 883 cal yr BP -58 cal yr BP Complete -43.3647 -43.3647 146.875 146.875 159 159 Continent Australia/New Zealand Australia Tasmania Duckhole Lake>LATITUDE -43.3647>LONGITUDE 146.875 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 KM Saunders, M Grosjean, DA Hodgson 2013 The Holocene 23 6 771-783 10.1177/0959683612470176 http://hol.sagepub.com/content/23/6/771.abstract

A lack of quantitative high resolution paleoclimate data from the Southern Hemisphere limits the ability to examine current trends within the context of long-term natural climate variability. This study presents a temperature reconstruction for southern Tasmania based on analyses of a sediment core from Duckhole Lake (43.365S, 146.875E). The relationship between non-destructive whole core scanning reflectance spectroscopy measurements in the visible spectrum (380-730 nm) and the instrumental temperature record (ad 1911-2000) was used to develop a calibration-in-time reflectance spectroscopy-based temperature model. Results showed that a trough in reflectance from 650 to 700 nm, which represents chlorophyll and its derivatives, was significantly correlated to annual mean temperature. A calibration model was developed (R = -0.56, p auto < 0.05, root mean squared error of prediction (RMSEP) = 0.21C, five-year filtered data, calibration period 1911-2000) and applied down-core to reconstruct annual mean temperatures in southern Tasmania over the last c. 950 years. This indicated that temperatures were initially cool c. ad 1050, but steadily increased until the late ad 1100s. After a brief cool period in the ad 1200s, temperatures again increased. Temperatures steadily decreased during the ad 1600s and remained relatively stable until the start of the 20th century when they rapidly decreased, before increasing from ad 1960s onwards. Comparisons with high resolution temperature records from western Tasmania, New Zealand and South America revealed some similarities, but also highlighted differences in temperature variability across the mid-latitudes of the Southern Hemisphere. These are likely due to a combination of factors including the spatial variability in climate between and within regions, and differences between records that document seasonal (i.e. warm season/late summer) versus annual temperature variability. This highlights the need for further records from the mid-latitudes of the Southern Hemisphere in order to constrain past natural spatial and seasonal/annual temperature variability in the region, and to accurately identify and attribute changes to natural variability and/or anthropogenic activities. STUDY NOTES: Sediment reflectance data (650-700 nm trough, a proxy for Total chlorin) and temperature reconstruction for the past 950 years from Duckhole Lake, southern Tasmania, Australia.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/duckhole2013refl.txt Data File; Duckhole Lake Sediment Reflectance Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/duckhole2013temp.txt Data File; Duckhole Lake Temperature Reconstruction USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11