14:00 〜 14:15
[MIS12-22] The Global Archive of Paleo Sea Level Indicators and Proxies (GAPSLIP) and application to assess past ice sheets
キーワード：sea level, glacial isostatic adjustment, Greenland Ice Sheet, ice sheets, database
Sea level rise is one of the largest threats to society, as the infrastructure of major coastal cities around the world become increasingly vulnerable to storm and wave action. However, the rate of sea level rise is not uniform around the world, due to the geophysical processes relating to the distribution of water and ice on the Earth's surface over time, known as glacial isostatic adjustment (GIA). The GIA processes means that places that were covered by large Pleistocene ice sheets are subject to falling sea level, due to the residual uplift after the ice sheets retreated. Other places may have larger rates of sea level rise than the global average due to the gravitational effects of the changing distribution of ice and water on the Earth's surface and the flow of deep mantle rock towards the center of uplift. In order to estimate the magnitude of present day GIA signals, it is necessary to create a reconstruction of the history of the Pleistocene ice sheets. The best way to constrain this history is to compare calculated sea level from a GIA model to sea level changes in the past. By comparing sea level proxies in different places around the world, it becomes possible to precisely define the distribution of ice volume in the past. In this presentation, I introduce the Global Archive of Paleo Sea Level Indicators and Proxies (GAPSLIP), and open source database that contains geological indicators of past sea level during the Holocene and Late Pleistocene. As of February 1, 2024, there are over 14,700 data points from over 1600 studies entered into the database. These data are from eastern North America, Greenland, Europe, the Eurasian Arctic, Mediterranean, southeastern Asia, Australia and Antarctica. This fully cited database contains Generic Mapping Tools plotting scripts that make it possible to quickly compare calculated sea level and the data in a report generated by LaTeX. I demonstrate the utility of this database using calculated sea level from the PaleoMIST ice sheet reconstruction. I first demonstrate that the total ice volume in Greenland at the Last Glacial Maximum was likely larger than previously estimated. I also demonstrate that complex 3D rheology may not be needed to model past sea level changes in Western Europe, as this is a result of a-priori assumptions on ice sheet geometry and Earth rheology. GAPSLIP is available at: https://github.com/evangowan/paleo_sea_level