English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

. It is well known that ice sheet–climate feedbacks are essential forrealistically simulating the spatiotemporal evolution of continental icesheets over glacial–interglacial cycles. However, many of these feedbacksare dependent on the ice sheet thickness, which is poorly constrained byproxy data records. For example, height estimates of the Laurentide Ice Sheet(LIS) topography at the Last Glacial Maximum (LGM; ∼ 21 000 years ago)vary by more than 1 km among different ice sheet reconstructions. In orderto better constrain the LIS elevation it is therefore important to understandhow the mean climate is influenced by elevation discrepancies of thismagnitude. Here we use an atmospheric circulation model coupled to aslab-ocean model to analyze the LGM surface temperature response to a broadrange of LIS elevations (from 0 to over 4 km). We find that raising the LIStopography induces a widespread surface warming in the Arctic region,amounting to approximately 1.5 ∘C per km of elevation increase, orabout 6.5 ∘C for the highest LIS. The warming is attributed to anincreased poleward energy flux by atmospheric stationary waves, amplified bysurface albedo and water vapor feedbacks, which account for about two-thirdsof the total temperature response. These results suggest a strong feedbackbetween continental-scale ice sheets and the Arctic temperatures that mayhelp constrain LIS elevation estimates for the LGM and explain differences inice distribution between the LGM and earlier glacial periods.

Arctic warming induced by the Laurentide Ice Sheet topography