noaa-lake-23080 Foy Lake, Montana Oxygen Isotope Data covering the last 2,200 years Stevens, L.R.; Stone, J.R.; Fritz, S.C. Foy Lake, Montana Oxygen Isotope Data covering the last 2,200 years 2017-11-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23080 Investigator L.R. Stevens Investigator J.R. Stone Investigator S.C. Fritz earth science paleoclimate paleolimnology delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,null,null,N,sediments <63um 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 oxygen isotopes geoscientificInformation 3113 cal yr BP -42 cal yr BP Complete 48.166667 48.166667 -114.35 -114.35 1006 1006 Continent North America United States Of America Montana Foy Lake, Montana>LATITUDE 48.166667>LONGITUDE -114.35 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Stevens, Lora R., Jeffery R. Stone, Josh Campbell, and Sherilyn C. Fritz 2006 Quaternary Research 65 2 264-274 10.1016/j.yqres.2005.08.024

A 2200-yr long, high-resolution ( ~5 yr) record of drought variability in northwest Montana is inferred from diatoms and d18O values of bio- induced carbonate preserved in a varved lacustrine core from Foy Lake. A previously developed model of the diatom response to lake-level fluctuations is used to constrain estimates of paleolake levels derived from the diatom data. High-frequency (decadal) fluctuations in the de- trended d18O record mirror variations in wet/dry cycles inferred from Banff tree-rings, demonstrating the sensitivity of the oxygen-isotope values to changes in regional moisture balance. Low frequency (multi-centennial) isotopic changes may be associated with shifts in the seasonal distribution of precipitation. From 200 B.C. to A.D. 800, both diatom and isotope records indicate that climate was dry and lake level low, with poor diatom preservation and high organic carbon: nitrogen ratios. Subsequently, lake level rose slightly, although the climate was drier and more stable than modern conditions. At A.D. 1200, lake level increased to approximately 6 m below present elevation, after which the lake fluctuated between this elevation and full stage, with particularly cool and/or wetter conditions after 1700. The hydrologic balance of the lake shifted abruptly at 1894 because of the establishment of a lumber mill at the lake's outlet. Spectral analysis of the d18O data indicates that severe droughts occurred with multi-decadal (50 to 70 yr) frequency.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/NAm2kHydro-2017/data-version-1.0.0/Foy.Stevens.2006.lpd Linked Paleo Data (LiPD) File Format; Foy Lake, Montana d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/NAm2kHydro-2017/noaa-templates/data-version-1.0.0/Foy.Stevens.2006.txt NOAA Template File; Foy Lake, Montana d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11