Foy Lake, Montana 13,000 Year Diatom-inferred Drought Data Stone, J.R.; Fritz, S.C. Stone, J.R. Fritz, S.C. earth science/paleoclimate/paleolimnology (total benthic diatoms,null,null,dimensionless,null,paleolimnology,null,null,N,proportion) earth science/paleoclimate/paleolimnology (total planktic diatoms,null,null,dimensionless,null,paleolimnology,null,null,N,proportion) earth science/paleoclimate/paleolimnology (planktic:benthic diatom,null,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (nitrogen,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (sample identification,null,null,null,null,paleolimnology,null,null,C,null) earth science/paleoclimate/paleolimnology (total benthic diatoms,null,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 18O,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,total carbon/total nitrogen) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 13C,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,corrected,null,N,null) earth science/paleoclimate/paleolimnology (total tychoplanktic diatoms,null,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (carbon,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (Foy Lake>LATITUDE 48.1648>LONGITUDE -114.3589) Time series analysis of a diatom-inferred drought record suggests that Holocene hydroclimate of the northern Rocky Mountains has been characterized by oscillation between two mean climate states. The dominant climate state was initiated at the onset of the Holocene (ca. 11 ka); under this climate state, drought was strongly cyclic, recurring at frequencies that are similar to twentieth century multidecadal phase changes of the Pacific Decadal Oscillation. This pattern remained consistent throughout much of the mid-Holocene, continuing until ca. 4.5 ka. After this time the mean climate state changed, and drought recurrence became unstable; periods of cyclic drought alternated with periods of less predictable drought. The timing of this shift in climate was coincident with widespread severe drought in the mid-continent of North America. Overall, the strongest periodicity in severe drought occurred during the mid-Holocene, when temperatures in the northern Rocky Mountains were warmer than today. STUDY NOTES: Diatom and sediment chemistry data from Foy Lake, Montana, USA, interpreted as a proxy for drought in mid-continent North America over the Holocene. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Stone, J.R. Investigator : Fritz, S.C. 2008-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6188 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/montana/foy2006.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/montana/foy2006.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/montana/foy2006.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/montana/foy2006.xls English https://www.ncdc.noaa.gov/paleo/study/6188 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/montana/foy2006.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/montana/foy2006.xls Stone, J.,Fritz, S.C. 2006. Multidecadal drought and Holocene climate instability in the Rocky Mountains. Geology, 34(5), pp. 409-412 START YEAR: 12950 cal yr BP * END YEAR: -50 cal yr BP -114.3589 48.1648 -114.3589 48.1648