Lake Malawi 700 Year TEX86 Surface Water Temperature Reconstruction Powers, L.A.; Johnson, T.C.; Werne, J.P.; Castañeda, I.S.; Hopmans, E.C.; Sinninghe Damsté, J.S.; Schouten, S. Powers, L.A. Johnson, T.C. Werne, J.P. Castañeda, I.S. Hopmans, E.C. Sinninghe Damsté, J.S. Schouten, S. Other Hydroclimate Reconstruction PAGES 2k Network PAGES Africa 2k earth science/paleoclimate/paleolimnology (tetraether index of 86 carbon atoms,sediment,null,dimensionless,null,paleolimnology,null,null,N,replicate 1) earth science/paleoclimate/paleolimnology (tetraether index of 86 carbon atoms,sediment,null,dimensionless,null,paleolimnology,null,null,N,replicate 2) earth science/paleoclimate/paleolimnology (tetraether index of 86 carbon atoms,sediment,null,dimensionless,null,paleolimnology,null,null,N,replicate 4) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,null,null,N,TEX86) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (tetraether index of 86 carbon atoms,sediment,null,dimensionless,null,paleolimnology,averaged,null,N,null) earth science/paleoclimate/paleolimnology (tetraether index of 86 carbon atoms,sediment,one standard deviation,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (tetraether index of 86 carbon atoms,sediment,null,dimensionless,null,paleolimnology,null,null,N,replicate 3) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Lake Malawi, core M98-2P>LATITUDE -9.97667>LONGITUDE 34.23) (Lake Malawi, core M98-11C>LATITUDE -10.00333>LONGITUDE 34.28833) We have applied the TEX86 paleothermometer to produce a surface water temperature record for Lake Malawi spanning the past 700 years. Over much of the record temperature fluctuates from ~24-27°C with a mean of ~25°C; however, there has been a substantial increase in temperature of ~2.0°C during the past ~ 100 years. The TEX86 temperature record reveals a strong similarity to the instrumental record; both records demonstrate warming (~0.7-1.4°C) over the past ~50 years as well as a cooling anomaly around 1959. Comparison of the TEX86 temperature record with the proxy records of primary productivity suggests that wind induced upwelling and/or precipitation have a strong influence on the surface temperature of Lake Malawi. STUDY NOTES: Surface water 700 year temperature reconstruction for Lake Malawi, East Africa, produced using the TEX86 paleothermometer. Three cores collected during the 1998 International Decade for East African Lakes (IDEAL) expedition in the north basin of Lake Malawi were used in this study. Splicing data from multi-cores M98-11MCA and M98-11MCB, and gravity trigger core M98-2PG, results in a record spanning the past ~700 years. Sediment samples (~1-2 g dry weight) were collected from the cores and analyzed for TEX86 as described in Powers et al. (2005). We have applied the mean annual lake surface temperature (ALST) calibration equation, ALST=55.0*TEX86-14.0 Lake Malawi core M98-11MCA/B: 10°00.2'S, 34°17.3'E, water depth 404m. Lake Malawi core M98-2PG: 9°58.6'S, 34°13.8'E, water depth 363m. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Powers, L.A. Investigator : Johnson, T.C. Investigator : Werne, J.P. Investigator : Castañeda, I.S. Investigator : Hopmans, E.C. Investigator : Sinninghe Damsté, J.S. Investigator : Schouten, S. 2012-08-23 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13216 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2011.xls English https://www.ncdc.noaa.gov/paleo/study/13216 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2011.xls Powers, L.A., T. C. Johnson, J.P. Werne, I.S. Castañeda, E.C. Hopmans, J.S. Sinninghe Damsté, and S. Schouten. 2011. Organic geochemical records of environmental variability in Lake Malawi during the last 700 years, Part I: The TEX86 temperature record. Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 303, pp. 133-139. doi:10.1016/j.palaeo.2010.09.006 START YEAR: 1283 AD * END YEAR: 1996 AD 34.23 -10.00333 34.28833 -9.97667