ADVANCES IN RESEARCH ON TERRESTRIAL PALEOCLIMATE IN THE MID-CRETACEOUS HOTHOUSE EARTH
The mid-Cretaceous period(ca.125～80 Ma)was the extreme greenhouse period since the last 150 Ma,also known as the"hothouse Earth"period.In this paper,the current global terrestrial paleoclimate researches in the mid-Cretaceous are systematically reviewed and classified according to their research contents and methods.By summarizing and analyzing the quantitative data of terrestrial temperature and precipitation,it is found that the land temperature increased at about 100 Ma and reached the maximum value at the end of Cenomanian(14～26 ℃ in the middle latitude;8～18℃ in the high latitude).However,due to various factors such as topography,the precipitation records did not exhibit a clear trend.Notably,starting from around 100 Ma during the Cenomanian period,precipitation showed an increasing trend alongside the gradual rise in temperature.Further comparison with the global marine temperature records of the mid-Cretaceous shows that the terrestrial climate and marine climate had the same changing trend,which is the marine-terrestrial temperature rose in the early Cenomanian,and reached the highest value near the Cenomanian-Turonian boundary.The current terrestrial paleoclimate researches in the mid-Cretaceous also have some shortcomings,such as relatively few quantitative paleoclimate data and lack of continuous and high-resolution terrestrial paleoclimate records.The International Continental Scientific Drilling of the Songliao Basin has obtained approximately 6000-meter of nearly continuous terrestrial cores from the Cretaceous period(about 118～80 Ma),providing important geological data for the study of terrestrial paleoclimate changes in the hothouse Earth.In the future,it is expected to establish continuous and high-resolution terrestrial paleoclimate records in the mid-Cretaceous and explore the mechanism of the hothouse Earth climate.
万方数据
维普
