In the last decades tremendous advances have been achieved in reconstructing past climate variability on different time scales by exploiting various types of geological archives (e.g. ice cores, ocean and lake sediments, speleothems, tree-rings). However, most of the obtained proxy records of past climate variability mainly reflect regional climate signals and a compilation of all existing information into a global or at least hemispheric synthesis is still lacking, remaining a major challenge for the palaeoclimate community. Nevertheless, a global proxy synthesis from such a variety of different palaeoclimate archives is not trivial because of fundamentally different types of chronologies for the individual archives (e.g. annual layer counting in ice cores and lake sediments, radiometric dating, astronomical tuning) and a broad variety of different proxy data, which reflect different climatic parameters (e.g. temperature, precipitation) and have different sensitivities toward climate change.
The goal of work package WP 3.2, which is coordinated by GFZ Section 5.2, is the compilation and synthesis of existing high-resolution palaeoclimate records from ice cores, marine and lacustrine/terrestrial sediments as well as speleothems. The work of GFZ Section 5.2 thereby focusses on the compilation of proxy data from varved (annually laminated) lake sediments. Other working groups within WP 3.2 from AWI, MARUM and Johannes Gutenberg University Mainz will work on the other palaeoclimate archives. Schemes for quality control of different palaoeclimate datasets will be developed within the work package and existing proxy records will be classified and harmonized, being a prerequisite for generating a robust compilation of key proxy records from regional key archives in order to quantify variations of individual elements of the global climate system and associated biogeochemical processes during the last glacial cycle. The resulting robust and representative palaeoclimate datasets will be used for validating climate model simulations carried out within the project.
WP 3.2 Partners:
Johannes Gutenberg University Mainz
Alfred-Wegener-Institut Bremerhaven and Potsdam (AWI)
Centre for Marine Environmental Sciences (MARUM)
PalMod project website
Federal Ministry of Education and Research (BMBF), 01LP15-[A]