Shulou(Shulou.com)11/24 Report--

According to the July 10 news of CTOnews.com, Chinese researchers have found the sedimentary sequence evidence of the change of the Martian paleo-wind field in the landing area based on the Zhurong observation data, confirming that the eolian sand activity recorded the changes of the Martian paleoenvironment with the Martian rotation axis and ice age.

The relevant research results were published online in the journal Nature (CTOnews.com attached DOI:10.1038 / s41586,023-06206-1).

In view of the Martian climate problem, the researchers used the orbiter high-resolution camera, the rover navigation terrain camera, the multispectral camera, the surface composition analyzer, the meteorological measuring instrument and so on. The joint exploration of high-resolution remote sensing and close location was carried out in the landing area of "Zhurong", and the information of sand dune shape, surface structure and material composition were extracted.

Map source Pexels observation data show that after the most recent "ice age" (about 400000 to 2.1 million years ago), Mars may be due to changes in the inclination of its rotation axis, which led to a "glacial-interglacial" global climate change on Mars from low and middle latitudes to the polar regions, that is, the "interglacial age", in which the lowest latitude ice dust mantle (LDM) ice was eroded and removed and returned to the polar cap.

These observations are consistent with polar crown stratigraphy, but lack of evidence to support them. The researchers found sequence evidence of significant changes in the wind field in the landing area when the Zurong Mars rover traversed the LDM region of the southern Martian Utopia plain.

These sedimentary sequences are in good agreement with the records of the ice and dust cover distributed in the middle and high latitudes of Mars, which means that the landing area of Zhurong may have experienced two main climatic stages marked by changes in wind direction. the wind direction changed nearly 70 degrees from northeast to northwest, and the aeolian sand accumulation changed from crescent-shaped bright sand dunes to longitudinal dark sand ridges, because the change of wind regime was consistent with the end of the ice age. The results are consistent with Martian polar stratigraphic records, so this study will help to improve our understanding of Martian paleoclimate history.

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