Trout Lake, Yukon 14,400 Year Midge-Inferred July Temperature Irvine, F.; Cwynar, L.C.; Vermaire, J.C.; Rees, A.B.H. Irvine, F. Cwynar, L.C. Vermaire, J.C. Rees, A.B.H. PAGES 2k Network PAGES Arctic 2k earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Zalutschia sp. Type A) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cryptochironomus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Endochironomus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Microtendipes sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Parachironomus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Tanytarsus chinyensis) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Heterotrissocladius sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Metriocnemus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Psectrocladius (septentrionalis)) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Stichtochironomus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Tanytarsina) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Micropsectra sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Limnophyes sp.) earth science/paleoclimate/insect|paleolimnology (age,null,null,calendar kiloyear before present,null,insect|paleolimnology,null,null,N,null) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Pentaneurini) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Procladius sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Pseudodiamesa sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cricotopus/Orthocladius) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Orthocladiinae sp. 2) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Zalutschia sp. Type B) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Glyptotendipes sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cladotanytarsus mancus type) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,First instar chironomini) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Corynoneura/Thienemanniella) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Hydrobaenus/Oliveridia) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Corynocera oliveri type) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Chaoboridae) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Parakiefferiella bathophila type) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Parakiefferiella nigra type) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Psectrocladius sp. (Allo. & Meso.)) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Psectrocladius sp. (Psectrocladius)) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Psectrocladius sp. (Mono.)) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Pseudosmittia/Smittia) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Sergentia sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Protanypus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Monodiamesa sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Paracladius sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Parakiefferiella sp.B) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Chironomus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cyphomella/Harnischia/Paraclado.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Polypedilum sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Stempellinella/Zavrelia) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Einfeldia sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Dicrotendipes sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Ceratopogonidae) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Indeterminable) earth science/paleoclimate/insect|paleolimnology (depth,null,null,centimeter,null,insect|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,null) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Mesocricotopus sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Parakiefferiella triquetra type) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Psectrocladius sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Zalutschia zalutschicola) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Cladopelma sp.) earth science/paleoclimate/insect|paleolimnology (identified midge,null,null,percent,null,insect|paleolimnology,null,null,N,Unknown) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Trout Lake Yukon>LATITUDE 68.828>LONGITUDE -138.75) Two cores from Trout Lake, northern Yukon, yielded quantitative estimates of summer air temperatures using fossil midge larvae. Warming began around 14,400 cal yr BP, with inferred mean July air temperatures reaching values warmer than present by 12,800 cal yr BP. A 1°C cooling from 12,200 to 11,200 cal yr BP closely corresponds with the Younger Dryas chronozone. A broad temperature maximum occurred between 10,800 and 9,800 cal yr BP, with mean July air temperature about 2.2 °C warmer than present. This represents an early Holocene thermal maximum and coincides with increased organic content of the sediment. Both the shallow- and deep-water cores show similar temperature trends for their overlapping periods. The inferred rise in mean July air temperature at 14,200 cal yr BP coincides with a shift in vegetation from an herb- to shrub- dominated landscape. In contrast, the increase in Alnus pollen at 6,400 cal yr BP does not coincide with a change in temperature, but may be a response to a rise in precipitation. STUDY NOTES: Fossil midge larval data and inferred mean July air temperature, plus pollen data and Loss-on-Ignition data from Trout Lake, northern Yukon covering the past 14,400 years. Trout Lake, Yukon: 68.828°N, 138.75°W, 150m elevation, ~9m water depth. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Irvine, F. Investigator : Cwynar, L.C. Investigator : Vermaire, J.C. Investigator : Rees, A.B.H. 2012-06-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13094 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/trout2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/trout2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/trout2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/trout2012.txt English https://www.ncdc.noaa.gov/paleo/study/13094 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/trout2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/yukon/trout2012.txt Irvine, F., L.C. Cwynar, J.C. Vermaire, and A.B.H. Rees. 2012. Midge-inferred temperature reconstructions and vegetation change over the last ~15,000 years from Trout Lake, northern Yukon Territory, eastern Beringia. Journal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 133-146. DOI: 10.1007/s10933-012-9612-7 START YEAR: 14400 cal yr BP * END YEAR: 0 cal yr BP -138.75 68.828 -138.75 68.828