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Figure 2 Comparison of dry and wet records in the Tengger Desert with other paleoenvironmental records
With funding from the National Natural Science Foundation of China (42030505, 41888101), etc.
, Dr.
Liu Chengying of Lanzhou University, Professor Nie Junsheng, and Academician Xiao Wenjiao of Xinjiang Institute of Ecology and Geography of the Chinese Academy of Sciences, etc.
Does the environment in desert areas have periodic dry and wet changes, and what are the changing laws and mechanisms? This is essential for understanding the evolution of arid environments
.
The above-mentioned research team used the sedimentary characteristics and environmental magnetic indicators of drilling cores in the Tengger Desert in the marginal area of the East Asian monsoon (Figure 1) to restore the 3 million years of environmental dry and wet records in the Tengger Desert, and found that There is a significant 400,000-year cycle of the dry and wet changes in the region, corresponding to the changes in the degree of oblateness of the earth's orbital eccentricity (Figure 2)
.
At the same time, the study restored the history of periodic dry and wet changes in the monsoon marginal environment under the control of East Asian monsoon precipitation, providing a new perspective for clarifying the inconsistency of East Asian monsoon precipitation change cycles recorded by different paleoclimate carriers
