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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. In simulations with the MPI Earth System Model, we study the feedback betweenthe terrestrial carbon cycle and atmospheric CO2 concentrations underice age and interglacial conditions. We find different sensitivities ofterrestrial carbon storage to rising CO2 concentrations in the twosettings. This result is obtained by comparing the transient response of theterrestrial carbon cycle to a fast and strong atmospheric CO2 concentration increase (roughly 900  ppm ) in Coupled Climate Carbon Cycle Model Intercomparison Project (C 4 MIP)-type simulationsstarting from climates representing the Last Glacial Maximum (LGM) andpre-industrial times (PI). In this set-up we disentangle terrestrialcontributions to the feedback from the carbon-concentration effect, actingbiogeochemically via enhanced photosynthetic productivity when CO2 concentrations increase, and the carbon–climate effect, which affects thecarbon cycle via greenhouse warming. We find that the carbon-concentrationeffect is larger under LGM than PI conditions because photosyntheticproductivity is more sensitive when starting from the lower, glacial CO2 concentration and CO2 fertilization saturates later. Thisleads to a larger productivity increase in the LGM experiment. Concerning thecarbon–climate effect, it is the PI experiment in which land carbon respondsmore sensitively to the warming under rising CO2 because at thealready initially higher temperatures, tropical plant productivitydeteriorates more strongly and extratropical carbon is respired moreeffectively. Consequently, land carbon losses increase faster in the PI thanin the LGM case. Separating the carbon–climate and carbon-concentrationeffects, we find that they are almost additive for our model set-up; i.e. their synergy is small in the global sum of carbon changes. Together,the two effects result in an overall strength of the terrestrial carbon cyclefeedback that is almost twice as large in the LGM experiment as in the PIexperiment. For PI, ocean and land contributions to the total feedback are ofsimilar size, while in the LGM case the terrestrial feedback is dominant.

Earth system model simulations show different feedback strengths of the terrestrial carbon cycle under glacial and interglacial conditions