Quantifying the Influence of Changes in Earth's Orbital Parameters and Greenhouse Gases Concentrations on Mid-Holocene Climate
According to the latest Paleoclimate Model Intercomparison Project (PMIP4) protocol,differences between the mid-Holocene and pre-industrial climates were investigated using the fully coupled climate model CESM1.0.The impact of the earth's orbital parameters (ORB) and greenhouse gases (GHG) on mid-Holocene climate change were quantified.Three simulation experiments showed that compared with the pre-industrial simulation,the simulated mid-Holocene was warmer in the high-latitude of the northern Hemisphere,colder in the rest of the world,wetter in most of the northern hemisphere,and drier in the southern hemisphere.The ORB led to warming in the mid-to-high latitudes globally,while GHG played a role in lowering global temperatures and reducing precipitation in the mid-to-high latitudes.These differences in turn induced changes in atmospheric and oceanic circulation,ultimately resulting in differences in the Earth's meridional heat transport.In terms of the variation in total meridional heat transport,ORB exerted approximately five times the climate impact compared with GHG.This study carried positive implications for deepening the understanding of the mid-Holocene climate and its response to various external forcings.
mid-Holoceneglobal climateearth's orbital parametergreenhouse gasesmeridional heat transport
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