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Scientists explain why climate models can't reproduce the early-2000s global warming slowdown

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IMAGE: Warming rates during the rapid warming period (1975/01-1997/12) (a) and the warming hiatus period (1998/01-2013/12) (b) and the warming rate change during the hiatus period relative to the rapid warming...
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Credit: ©Science China Press
A new study led by Dr. Wei and Dr. Qiao from the First Institute of Oceanography, Ministry of Natural Resources provides an evaluation of the performance of the newly released CMIP6 models in simulating the global warming slowdown observed in the early 2000s. This study reveals that the key in simulating and predicting near-term temperate change is to correctly separate and simulate the two distinct signals, i.e., the human-induced long-term warming trend and natural variabilities, especially those at interannual, interdecadal and multidecadal scales. This work was online published in SCIENCE CHINA Earth Sciences on April 15th, 2021.

China , Science-china-earth-sciences , National-natural-science-foundation-of-china-nos , Earth-sciences-on , Ministry-of-natural-resources , First-institute-of-oceanography , First-institute , Natural-resources , National-natural-science-foundation , Earth-science , சீனா

Ergodicity of turbulence measurements upon complex terrain in Loess Plateau

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IMAGE: The comparison of the ergodicities of the autocorrelation function of radial wind turbulence under different stratification and scale conditions.
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Credit: ©Science China Press
Loess Plateau possesses a particular loess physiognomy with numerous ravines and slopes, and tableland is a typical landform in it. Together, the ununiform in both topographic undulation and land coverage compose the ununiform, complex underlying surface on Loess Plateau. This provides a special platform for research of turbulence above the complex underlying surface.
As the front-edge problem encountered in the atmospheric boundary layer thesis, the turbulence research for complex underlying surface has drawn extensive attention recently. Local similarity has already proven that under certain condition, theories of turbulence based on the uniform underlying surface can also be applied to which for the ununiform underlying surface. However, as there are still many inapplicable aspects for the complex underlying surface due to its complexity. For eddy-correlation technique, the basic principles of turbulence measurements are ensemble averages of certain space, time, and status, but it is impossible to set up massive equipment within a limited space and obtain all-state for turbulence eddy for a required period time while meeting the ensemble average. Therefore, this experiment bases on such assumption that the fluid field is steady and space are horizontally uniform by replacing the ensemble average with the average of a long-time measurement at one site. So it is necessary to regard the examination of ergodicity for the eddy-correlation technique as the precondition for the experimental research of turbulence in complex terrain of Loess Plateau tableland in its early stage.

China , Loess-plateau , China-general , Gansu , Earth-sciences , National-natural-science-foundation-of-china-nos , Technology-program , National-natural-science-foundation , Gansu-science , Science-china , சீனா

The revelation of the crustal geometry of the western Qilian Mountains, NE Tibetan Plateau

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IMAGE: (a) Current lithospheric structure across the western Qilian Mountains and adjacent regions by combining our result with previous geological and geophysical results. (b) The construction process of the Qilian Mountains....
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Credit: @Science China Press
As the largest orogenic plateau on earth, the Qinghai-Tibet Plateau was caused by a complex crustal deformation process during the continuous collision and compression process between the Indian and Eurasian continents starting at least 60-50 Ma ago. The formation of the Qinghai-Tibet Plateau records the collision of the two continents and the deformation process and mechanism within the continents. Therefore, Qinghai-Tibet Plateau is considered as a natural ideal laboratory for the study of continent-continent collision and dynamics. At present, the continuous collision between Eurasia and Indian continents is still ongoing, resulting in the Qinghai-Tibet Plateau is still continuing to expand outward. The western section of Qilian Mountains on the northeast margin of The Qinghai-Tibet Plateau, as the northeast boundary of the Plateau, was uplifted and became part of the present Qinghai-Tibet Plateau during the Middle Miocene, according to the latest chronology results. Therefore, as one of the youngest parts of the Qinghai-Tibet Plateau, the western Qilian Mountains is one of the key areas to test various proposed models of the formation of the Qinghai-Tibet Plateau.

China , Hexi , Jilin , Qilian , Gansu , Tibetan-plateau , China-general , Tibet , Xizang , Qinghai , Guizhou ,