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

. During the Last Glacial Maximum (LGM), atmospheric CO2 was around 90 ppmv lower than during thepre-industrial period. The reasons for this decrease are most oftenelucidated through factorial experiments testing the impact of individualmechanisms. Due to uncertainty in our understanding of the real system,however, the different models used to conduct the experiments inevitablytake on different parameter values and different structures. In this paper,the objective is therefore to take an uncertainty-based approach toinvestigating the LGM CO2 drop by simulating itwith a large ensemble of parameter sets, designed to allow for a wide rangeof large-scale feedback response strengths. Our aim is not to definitelyexplain the causes of the CO2 drop but ratherexplore the range of possible responses. We find that the LGM CO2 decrease tends to predominantly be associatedwith decreasing sea surface temperatures (SSTs), increasing sea ice area, aweakening of the Atlantic Meridional Overturning Circulation (AMOC), astrengthening of the Antarctic Bottom Water (AABW) cell in the AtlanticOcean, a decreasing ocean biological productivity, an increasing CaCO3 weathering flux and an increasing deep-sea CaCO3 burial flux. The majority of our simulationsalso predict an increase in terrestrial carbon, coupled with a decrease inocean and increase in lithospheric carbon. We attribute the increase interrestrial carbon to a slower soil respiration rate, as well as thepreservation rather than destruction of carbon by the LGM ice sheets. Aninitial comparison of these dominant changes with observations andpaleoproxies other than carbon isotope and oxygen data (not evaluateddirectly in this study) suggests broad agreement. However, we advise moredetailed comparisons in the future, and also note that, conceptually atleast, our results can only be reconciled with carbon isotope and oxygendata if additional processes not included in our model are brought intoplay.

climate of the past

Coupled climate–carbon cycle simulation of the Last Glacial Maximum atmospheric CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; decrease using a large ensemble of modern plausible parameter sets