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A recent study by an international research group led by Professor AO Hong of the Institute for Global Environmental Studies, Chinese Academy of Sciences, revealed climate change and dynamics in Asia during the early to mid-Pliocene warm season, providing clues to the future climate. .. Change.
The collaborative research team consisted of scientists from China, Australia, Germany, France, the Netherlands, and the United States. The results of the group survey are Nature Communications November 26th.
The early to mid-Pliocene warm period, about 5 to 3 million years ago (Ma), which preceded the Northern Hemisphere ice age, was the latest period of more sustained warmth than it is today.During this warm period, the Earth’s average annual surface temperature is about 2-4 ° C higher than it is today, the Northern Hemisphere is almost ice-free, the world’s sea level is about 20-25 m higher than it is today, and atmospheric CO is2 The concentration was comparable to the current level.
The 6th Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) is projecting the current high CO2The warm conditions will last for a long time and will probably intensify. It may change the Earth’s future climate to a warm state similar to the early to mid-Pliocene warm period.
“Understanding climate change and dynamics during the early to mid-Pleistocene warming is important for more accurate predictions of future climate response to sustained global warming,” said the lead researcher. One AO professor said.
The Loess Plateau (CLP) aeolian loess / red soil sequence in China provides a unique high-resolution archive of continuous terrestrial climate change over the last 25 million years (Myr). Researchers have found that summer monsoon records (Al / Na, Rb / Sr, and brightness) with a resolution of ~ 1-2 thousand years (kyr) and a length of ~ 4.7 Myr continuously over a period of ~ 8.1 ~ ~ 3.4 Ma. ) Has been established. Inheritance of Shilou Aeolia Red Clay in Eastern CLP. These records reveal details and coercive mechanisms of Asian climate change on the orbital timescale, as well as longer trends from the late Miocene to the mid-Pliocene.
High resolution Al / Na, Rb / Sr, and brightness records show that the Asian summer monsoon has a marked 405-kyr and ~ 100-kyr periodicity between 8.1 and 3.4 Ma, and the eccentricity of solar radiation. It shows that it matches the dynamic response to the modulation. Low latitude coercion.
Surprisingly, the obliquity periodicity dominated the Antarctic glacier cycle from the late Miocene to the Pliocene, but is only weakly represented in these monsoon records. Therefore, orbital-scale Asian summer monsoon movements are more dynamic to ice sheet coercion than the late Miocene to mid-Pliocene ice sheet coercion, which is warmer than it is today, when the Northern Hemisphere was almost ice-free and continental. Seems to have responded to. An ice sheet developed only in Antarctica.
The research group will integrate the new CLP red soil, summer monsoon records with existing land records, land-sea correlations, and climate model simulations to create CO.2Global warming induced at about 5.3 Ma across the Miocene-Pliocene boundary (MPB) increases summer monsoon water transport in East Asia and increases evaporation in much of Central Asia. Promoted drying.
This finding provides paleoclimate-based support for “wet get wetter and dry get dryer” predictions of future regional hydroclimatic responses to sustained man-made coercion.
Observations of continental hydrological gradient enhancements in Asia associated with global warming across the MPB will have a significant impact on future Asian climate responses to sustained high anthropogenic emissions.
“This is because, with long-term persistent global warming, most East Asian monsoon regions could be even wetter than they are today, increasing the risk of flooding, while Central Asia is even drier and in the future. This means that more persistent droughts and desertification may continue, “said Professor Jin Chan-dong, co-author of the study and director of the National Institute of Major Studies in Les and Quaternary Geology. rice field.
This research was supported by the Chinese Academy of Sciences, the Ministry of Science and Technology of China, and the National Natural Science Foundation of China.
Hydrological climate transitions in Asia caused by global warming across the Miocene and Pliocene boundaries
Article publication date
November 26, 2021
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