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- PP33C-1097: Sensitivity of the Last Millennium Reanalysis to Enhanced Proxy Networks
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Board 1097‚ Hall EFG (Poster Hall)NOLA CC
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Tanaya Gondhalekar, University of Southern California (First Author, Presenting Author)
Julien Emile-Geay, Univ. of Southern California
Deborah Khider, University of Southern California
Albus Shang, University of Southern California
Nicholas McKay, Northern Arizona University
David Edge, Northern Arizona University
Gregory Hakim, University of Washington
Zilu Meng, University of Washington
Scientists reconstruct past climate using indirect (proxy) natural records like tree rings, corals, and lake sediments. These quantitative reconstructions provide insights into climate variability before modern instruments existed. We update the Last Millennium Reanalysis (LMR), which combines climate models and proxy data, using new and expanded databases that include more types and higher quality proxy records. The updated reconstruction using PReSto2k, which includes temperature-sensitive records, shows stronger climate signals than previous versions and captures cooling following major volcanic eruptions. We also test DOCU-CLIM, a database based on documentary evidence. On its own, DOCU-CLIM does not reproduce these volcanic cooling events but does capture broad climate patterns and shows potential when combined with our existing proxy networks. These results provide a benchmark for future reconstructions that will integrate diverse proxy data and use advanced data assimilation methods to better understand climate over the last two thousand years.
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