CARBO Kiel MAT 251 CO2 preparation and massspectrometer system

Mean d1880c. of replicates from 15 individuals (instars 6 and 7) is 4.60% for the winter 19921993 (15~~0, = 9.5%0) and 4.68% for the winter 19931994 (6permil*OL = 9.50, Table 1). Actual d180c. in both seasons is enriched compared to the isotopic composition of a theoretical calcite formed isotopic equilibrium ( d180eq). The difference is +2.3 2 O.l%o to a 6permil80, calculated using the fractionation factors given by Friedman and OpermilNeil ( 1977) and exactly matches the vital offsets for adults and juveniles of these species found during a oneyear calibration study in Ammersee and Starnberger See, which will be presented and discussed elsewhere.

Check symbols in isotopeInterpretation2_coefficient. Has isotopeInterpretation3_basis but no other details. lake residence time move to sensorIntegration?-BK

the response of d180L to the temperature controlled variations in d18Op will be characteristic for each lake and, therefore, must be evaluated by hydrological investigations for any lake used for paleoclimatic reconstructions...d18OL of Lake Ammersee proved to be sensitive to mean air temperature variations with periods higher than 10 years and amplitudes larger than 0.3 Kelvin.

Core AS TMAX; Only ~200 years from varves

von Grafenstein, Ulrich , Erlenkeuser, Helmut , Muller, Jens , Trimborn, Peter , Alefs, Joachim

A 200 year midEuropean air temperature record preserved in lake sediments: An extension of the permil18Opair temperature relation into the past

Von Grafenstein, U., Erlenkeuser, H., Mueller, J., Trimborn, P. and Alefs, J.: A 200 year mid-European air temperature record preserved in lake sediments: An extension of the δ18Op-air temperature relation into the past, Geochimica et Cosmochimica Acta, 60(21), 4025–4036, doi:10.1016/s0016-7037(96)00230-x, 1996.

Limnocythere gr. inopinata (typically c. 20 valves per sample)

In a closed, low-latitude lake basin, the d18O values of the lake water, which are the main control on the d18O values of carbonates, are influenced largely by the balance between inflow (mainly shallow groundwater, in the case of Kajemarum) and evaporation (Talbot 1990). Thus, the d18O record in endogenic carbonate should largely reflect salinity.