Weather

Asian climate change and dynamics during early to mid pliocene warmth provide clues to future climate change – Watts Up With That?



Peer-reviewed publications

CHINA ACADEMY OF SCIENCE DEPARTMENTS

PICTURE DESCRIPTION: SCHOOL PHOTO OF SHILOU CLOTH FACE FROM PLATEAU LOESS EAST CHINA see more
CREDIT: Pink T-shirt

A recent study by an international research team led by Professor AO Hong from the Institute of Earth Environment of the Chinese Academy of Sciences has revealed the variation and dynamics of Asia’s climate during the warm period. The Pliocene is from the early to the middle, thus providing clues to future climate change.

The joint research team includes scientists from China, Australia, Germany, France, the Netherlands and the United States. The team’s findings were published in Nature Communications on November 26

The Early to Mid Pliocene Warm Period ~5 to 3 million years ago (Ma) before the Northern Hemisphere glaciation is the most recent period of continuously warmer conditions. During this warm period, Earth’s average annual surface air temperature was ~2-4°C higher than today, Northern Hemisphere largely ice-free, global sea level higher than today ~ 20-25 m and CO2 concentrations comparable to today’s levels.

The sixth assessment report of the Intergovernmental Panel on Climate Change (IPCC) current high CO projects2, the warming will continue for a long time and is likely to intensify, possibly shifting Earth’s climate in the future to a warm state similar to the early to mid Pliocene Warm Period.

Professor AO, principal investigator of the study, said: “Understanding the variability and dynamics of climate throughout the early to mid-Pliocene warm period is crucial for better predicting gaseous responses future consequences for sustainable global warming,” said Prof. AO, the study’s principal investigator.

The aeolian red loess/clay sequences on the Chinese Loess Plateau (CLP) provide a single high-resolution archive of continuous terrestrial climate variations spanning the past 25 million years. Myr). The researchers established continuous summer monsoon records ~4.7 Myr (Al/Na, Rb/Sr, and mild) between ~8.1 and ~3.4 Ma in ~1–2 thousand years (kyr) resolution from the Shilou aeolian red clay succession on the eastern CLP. These records reveal the details and obligatory mechanisms of Asian climate change at an orbital period as well as longer trends from the Late Miocene to the mid-Pliocene.

The high-resolution records of Al/Na, Rb/Sr, and luminosity show a prominent 405 kyr and ~100 kyr Asian summer monsoon between 8.1 and 3.4 Ma, consistent With the dynamic response to eccentric modulation of solar insulation, a low latitude forces.

Surprisingly, oblique periodicity is only weakly represented in those monsoon records, even though it dominated the Antarctic glacial cycles during the Late Miocene-Pliocene. Thus, it seems that the Asian summer monsoon variation on the orbital scale responds more dynamically to isolation than to ice forcing during the warmer Late Miocene to the mid-Pliocene as the North hemisphere is largely ice-free and on a continental scale. Ice sheets only grow in Antarctica.

By integrating their new CLP red clay, summer monsoon profile with existing terrestrial, land-sea correlations, and climate model simulations, the team found that CO2– Global warming induced across the Miocene-Pliocene boundary (MPB) at ~5.3 Ma both increases summer monsoon moisture transport through East Asia, and enhances aridity over large areas of Central Asia by increasing evaporation.

This finding provides paleontological climate-based support for “wet-wetter and drier-than” projections of future regional hydro-climate responses for sustainable human coercion. .

The observation of continental-scale hydrological gradient enhancement in Asia in relation to global warming across the MPB has important implications for future Asian climate responses to climate change. human-maintained waste.

“It implies that with sustained global warming, most of the East Asian monsoon regions could become wetter than they are now, with an increasing risk of flooding, while Central Asia could become even drier, with persistent droughts and desertification in the future,” said Professor JIN Zhangdong, co-author of the study and director of the state’s Key Laboratory of Yellowstone Geology. Earth and Quaternary said.

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.


JOURNEYS

Nature Communications

DOI

10.1038 / s41467-021-27054-5

ARTICLE TITLE

The Asian hydro-climate shift causes global warming across the Miocene-Pliocene boundary.

ARTICLE PUBLICATION DATE

November 26, 2021



Source link

news7g

News7g: Update the world's latest breaking news online of the day, breaking news, politics, society today, international mainstream news .Updated news 24/7: Entertainment, Sports...at the World everyday world. Hot news, images, video clips that are updated quickly and reliably

Related Articles

Back to top button