Using all available simulations performed by climate models participating in PMIP4(Paleoclimate Modelling Intercomparison Project-Phase 4),the authors quantify the seasonality change of surface air temperature over Ch...Using all available simulations performed by climate models participating in PMIP4(Paleoclimate Modelling Intercomparison Project-Phase 4),the authors quantify the seasonality change of surface air temperature over China during the mid-Holocene(6000 years ago)and the associated physical mechanisms.Relative to the preindustrial period,all 16 models consistently show an enhanced temperature seasonality(i.e.,summer minus winter temperature)across China during that interglacial period,with a nationally averaged enhancement of 2.44 C or 9%for the multimodel mean.The temperature seasonality change is closely related with the seasonal contrast variation of surface energy fluxes mainly due to the mid-Holocene orbital forcing.Specifically,the summerwinter increase in surface net shortwave radiation dominates the intensified temperature seasonality at the large scale of China during the mid-Holocene;the surface net longwave radiation has a minor positive contribution in most of the Tibetan Plateau and eastern China;and both the surface latent and sensible heat fluxes show partial offset effects in most of the country.There are uncertainties in the reconstructed temperature seasonality over China during the mid-Holocene based on the proxy data that can reflect seasonal signals.展开更多
基金the National Natural Science Foundation of China[grant numbers 41931181 and 42075048]the Youth Innovation Promotion Association of the Chinese Academy of Sciences[grant number 2022075].
文摘Using all available simulations performed by climate models participating in PMIP4(Paleoclimate Modelling Intercomparison Project-Phase 4),the authors quantify the seasonality change of surface air temperature over China during the mid-Holocene(6000 years ago)and the associated physical mechanisms.Relative to the preindustrial period,all 16 models consistently show an enhanced temperature seasonality(i.e.,summer minus winter temperature)across China during that interglacial period,with a nationally averaged enhancement of 2.44 C or 9%for the multimodel mean.The temperature seasonality change is closely related with the seasonal contrast variation of surface energy fluxes mainly due to the mid-Holocene orbital forcing.Specifically,the summerwinter increase in surface net shortwave radiation dominates the intensified temperature seasonality at the large scale of China during the mid-Holocene;the surface net longwave radiation has a minor positive contribution in most of the Tibetan Plateau and eastern China;and both the surface latent and sensible heat fluxes show partial offset effects in most of the country.There are uncertainties in the reconstructed temperature seasonality over China during the mid-Holocene based on the proxy data that can reflect seasonal signals.
