Dresden 2020 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 5: Poster Session

UP 5.1: Poster

Mittwoch, 18. März 2020, 14:00–16:00, P2/4OG

Temperature and precipitation relationship during the last Glacial from pollen records and climate simulations
— •Anna Sommani, Nils Weitzel, and Kira Rehfeld — Institute of Environmental Physics, Heidelberg, Germany

The hydrological response to radiative forcing is much less understood than the thermal one: many climate models have difficulties in simulating seasonal rainfall and its variability. Confident projections of precipitation are of crucial importance particularly for regions where agriculture is highly dependent on seasonal rainfall, such as South and Central Asia. It was shown that, while temperature and precipitation are negatively correlated on short timescales (10⁻³ to 10⁰ years), on longer timescales (10¹ to 10³ years), proxy and instrumental data observations have a positive correlation between temperature and precipitation. Climate models in contrast simulate a negative correlation on all timescales for Asia. Here, temperature and precipitation from four high resolution pollen records at mid-latitudes in the Northern Hemisphere are reconstructed, investigated and compared with climate model simulations. We focus on the last Glacial period, characterized by pronounced millennial-scale climate fluctuations. The differences between reconstructed and simulated temperature–precipitation relationship as well as orbital- and millennial-scale variability are examined. In particular, we explore whether thermodynamic laws can explain the observed relationship between temperature and precipitation.