&Emsp& Emsp; The "Cenozoic Geology and Environment" team led by Associate Professor Zhang Rui from the Department of Geology has conducted detailed cyclic stratigraphy and astronomical chronology research on the Late Miocene to Upper Miocene aeolian red clay in the eastern Loess Plateau of China in recent years. Focusing on deciphering the unconventional 170000 year slope modulation period related to long-term frequency disturbances in the orbital inclination between Earth and Saturn. Similar to the 400000 year long eccentricity period, the 170000 year long slope period has been proven by the latest astronomical solutions to be an important orbital driving component and can serve as a "metronome" indicator of climate fluctuations in the Miocene Pliocene, revealing the wind induced periodic sedimentary patterns in the East Asian monsoon region and reconstructing global atmospheric circulation. Research has pointed out that sedimentary cycles caused by modulation slope are also an important reason for the formation of dry wet alternation climate in the Late Miocene to Pliocene. The 170000 year cycle variation discovered in the monsoon system is one of the key links in revealing long-term climate patterns. These findings improve the previous assumption that only a 400000 year eccentricity period would contribute to driving climate change from the Late Miocene to the Upper Miocene. This study was published on January 10, 2022 in the renowned geoscience journal Geophysical Research Letters

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&emsp& Emsp< Br/>&emsp& Emsp; Today, industrialization is still in full swing. Humanity also recognizes that greenhouse gas emissions will further alter the Earth's environment and climate, and scientific development is still evaluating the subsequent impacts. If the climate breaks free from its original patterns, even if it does not bring disasters to all humanity, it will challenge the human living environment for a long time. For example, global warming caused by a large amount of greenhouse gas emissions will significantly melt the Antarctic and Greenland ice sheets, and rising sea levels will inundate major financial and economic centers around the world today, forcing humanity to engage in large-scale population migration. Therefore, paying attention to climate change during the Pliocene and Late Miocene, when temperatures were 1-4 degrees Celsius higher than they are now 2.6 million years ago, is also one of the most concerning areas for our cutting-edge scientists< Br/>&emsp& Emsp< Br/>&emsp& Emsp; According to astronomical research, the five planets of gold, wood, water, fire, and earth play an important role in the periodic changes in the eccentricity and slope of the Earth's orbit, with their influence second only to the Sun and Moon. Saturn is the farthest planet from Earth among the five major planets, but it is the second largest planet in the solar system after Jupiter, characterized by its rings. Saturn is also the planet with the most satellites in the solar system (at least 83 satellites). Among them, Titan, nicknamed Titan, is even larger than Mercury in the planet< Br/>&emsp& Emsp< Br/>&emsp& Emsp; The long-term force that currently affects the variation of Earth's eccentricity is primarily the modulation period of the eccentricity of Venus Jupiter orbit, which lasts for 400000 years. Then there are other paired resonance modulation periods between Mars, Jupiter, Venus, Earth, and Mercury. Due to the fact that the cycles of these pairs of forces are all around 100000 years, they together constitute the second important short eccentricity cycle. Among them, the eccentricity period of 400000 years from Venus to Jupiter can be stable for hundreds of millions of years, while the short eccentricity modulation period of other 100000 years can only be traced back to the range of tens of millions of years, which is relatively unstable. The theoretical exploration of inclination or slope is slightly more complex. The two pairs of orbits with the greatest changes in long-term slope modulation are Mars Earth and Earth Saturn. This is because these two modulation effects are also stable for a long period of time (for example, current theories suggest at least 40 million years and 20 million years). Their slope modulation periods are calculated as 1.2 million years and 170000 years, respectively. However, this theoretical derivation still needs to be further validated by obtaining climate sensitive indicators from geological historical records. Especially, Boulila et al. did not fully understand the 170000 year modulation period until 2018 through astronomical theory combined with ocean sediment observations. In 2020, Laskar further improved the astronomical solution for this period, pointing out that the 170000 year long slope period can be used together with the 400000 year long eccentricity period as the most important pulsation "metronome" indicator on Earth, thereby determining the astronomical age of geological records. However, the tracking of continental climate indicators based on this theory still needs to be urgently addressed. In July 2021, Huang He and others reported that a climate cycle of 170000 years may exist within a range of hundreds of millions of years, based on organic carbon indicators collected from multiple lakes in Songliao and other areas