I work on climate reconstructions from marine sediments and stalagmites (cave dripstones) with a variety of geochemical methods. Recently I have focused on novel techniques to reconstruct past temperatures, most importantly clumped isotope thermometry. This method takes advantage of the fact that the distribution of isotopes within molecules depends on the formation temperature. Our state-of-the-art equipment at the stable isotope facility Farlab is specifically targeting samples where only limited material is available. This allows us to apply the method to marine microfossils (foraminifera) in order to reconstruct temperature changes in the ocean across the last 65 million years (projects C4T, funded by the European Research Council, and CLIP, funded by the Bergen Research Foundation).
In addition, with Yves Krüger we have established a technique that allows constraining growth temperatures of stalagmites by studying ancient drip water trapped as fluid inclusions within the calcite matrix. We are using this and other methods to reconstruct tropical temperatures across the last half million years in the project T-TRAC, funded by the Norwegian Research Council, as well as on South African stalagmites in the framework of the SapienCE Center.
Some recent publications (see CV for extended list):
Leutert, T.J., Sexton, P.F., Tripati, A., Piasecki, A., Ho, S.L., Meckler, A.N., 2019, Diagenetic effects on clumped isotope temperatures in fossil benthic and planktic foraminifera, Geochimica et Cosmochimica Acta 257, 354-372.
(how stable is the clumped isotope signal when foraminifera are stored in sediments over 40 million years?)
Piasecki, A., Marchitto, T., Bernasconi,. S.M., Grauel, A.-L., Tisserand, A., Meckler, A.N., 2019, Application of Clumped Isotope Thermometry to Benthic Foraminerfera, G-cubed, doi: 10.1029/2018GC007961.
(calibration of the clumped isotope signal in benthic foraminifera)
Meckler, A.N., Affolter, S., Dublyansky, Y.V., Krüger, Y., Vogel, N., Bernasconi, S.M., Frenz, M., Kipfer, R., Leuenberger, M., Spötl, C., Carolin, S., Cobb, K.M., Moerman, J., Adkins, J.F., Fleitmann, D., 2015, Glacial–interglacial temperature change in the tropical West Pacific: A comparison of stalagmite-based paleo-thermometers, Quaternary Science Reviews 127, 90-116.
(Temperature proxy comparison in stalagmites and new estimates for glacial-interglacial temperature change in the terrestrial tropics)
Meckler, A.N., Ziegler, M., Millán, I., Breitenbach, S.F.M., Bernasconi, S., 2014, Long-term performance of the Kiel carbonate device with a new correction scheme for clumped isotope measurements, Rapid Communications in Mass Spectrometry 28, 1705-1715.
(Carbonate clumped isotope thermometry: Data processing scheme for small sample measurements and assessment of reproducibility)
Meckler, A.N., Sigman, D.M., Gibson, K.A., François, R., Martínez-García, A., Jaccard, S.L., Röhl, U., Peterson, L.C., Tiedemann, R., Haug, G.H, 2013, Deglacial pulses of deep-ocean silicate into the subtropical North Atlantic Ocean. Nature 495, 495-498.
(Deglacial CO2 change: Indications for a prominent role for ocean circulation)
Meckler, A.N., Clarkson, M.O., Cobb, K.M., Sodemann, H., and Adkins, J.F., 2012, Interglacial hydroclimate in the tropical West Pacific through the late Pleistocene. Science 336, 1301-1304.
(Stalagmite-based climate reconstructions: First long tropical hydroclimate record reaching back to more than 500,000 years ago)
- 2020. A robust calibration of the clumped isotopes to temperature relationship for foraminifers. Geochimica et Cosmochimica Acta. doi: https://doi.org/10.1016/j.gca.2019.11.022
- 2019. Fingerprint of tropical climate variability and sea level in sediments of the Cariaco Basin during the last glacial period. Sedimentology. 66: 1967-1988. doi: 10.1111/sed.12567
- 2019. The DeepMIP contribution to PMIP4: Methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database. Geoscientific Model Development. 12: 3149-3206. doi: 10.5194/gmd-12-3149-2019
- 2019. Sensitivity of clumped isotope temperatures in fossil benthic and planktic foraminifera to diagenetic alteration. Geochimica et Cosmochimica Acta. 257: 354-372. doi: 10.1016/j.gca.2019.05.005
- 2019. Application of Clumped Isotope Thermometry to Benthic Foraminifera. Geochemistry Geophysics Geosystems. 20: 2082-2090. doi: 10.1029/2018GC007961
- 2018. Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate-Based Standardization. Geochemistry Geophysics Geosystems. 19: 2895-2914. doi: 10.1029/2017GC007385
- 2017. A conceptual model for the response of tropical rainfall to orbital variations. Journal of Climate. 30: 8375-8391. doi: 10.1175/JCLI-D-16-0691.1
- 2016. An extended yardstick for climate variability. Nature. 534: 626-628.
Postdoctoral Scholar and lecturer, ETH Zürich, 2010-2014; Optimization of clumped isotope thermometry for small samples and application to fossil foraminifera from marine sediments; temperature reconstructions with stalagmites
Postdoctoral Scholar, California Institute of Technology, 2007-2009; Climate reconstructions from Borneo stalagmites, including U-series dating and clumped isotope thermometry; advisors Prof. Jess Adkins, Prof. John Eiler, collaboration with Prof. Kim Cobb (Georgia Institute of Technology)
PhD, ETH Zürich, 2006; "Late Quaternary changes in nitrogen fixation and climate variability recorded by sediments from the Gulf of Mexico and the Caribbean Sea"; supervision Prof. Hans Thierstein, Prof. Gerald Haug, Prof. Daniel Sigman (Princeton University)
I am leading two research projects on clumped isotope thermometry in foraminifera: The C4T project (2015-2020) is a Starting Grant from the ERC (European Research Council), and the CLIP project (2015-2019) is funded by the Bergen Research Foundation and the Department of Earth Science.
The T-TRAC project (2017-2021) is funded by the Norwegian Research Council and focuses on stalagmite-based temperature reconstructions from Borneo in the tropical West Pacific.