Reversals in Temperature-Precipitation Correlations in the Northern Hemisphere Extratropics During the Holocene
Herzschuh, Ulrike; Böhmer, Thomas; Li, Chenzhi; Cao, Xianyong; Hébert, Raphaël; Dallmeyer, Anne; Telford, Richard James; Kruse, Stefan
Journal article, Peer reviewed
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https://hdl.handle.net/11250/3054347Utgivelsesdato
2022Metadata
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- Department of Biological Sciences [2232]
- Registrations from Cristin [9748]
Sammendrag
Future precipitation levels remain uncertain because climate models have struggled to reproduce observed variations in temperature-precipitation correlations. Our analyses of Holocene proxy-based temperature-precipitation correlations and hydrological sensitivities from 2,237 Northern Hemisphere extratropical pollen records reveal a significant latitudinal dependence and temporal variations among the early, middle, and late Holocene. These proxy-based variations are largely consistent with patterns obtained from transient climate simulations (TraCE21k). While high latitudes and subtropical monsoon areas show mainly stable positive correlations throughout the Holocene, the mid-latitude pattern is temporally and spatially more variable. In particular, we identified a reversal from positive to negative temperature-precipitation correlations in the eastern North American and European mid-latitudes from the early to mid-Holocene that mainly related to slowed down westerlies and a switch to moisture-limited convection under a warm climate. Our palaeoevidence of past temperature-precipitation correlation shifts identifies those regions where simulating past and future precipitation levels might be particularly challenging.