2022-05-16
The Sinian (Ediacaran) Period was the last geological stage of Precambrian history during the evolution of the Earth. During the Sinian, the breakup of the Rodinia supercontinent induced the reorganization of the plate tectonic pattern of the Earth's lithosphere, the global magmatism and large-scale mineralization, which also had a significant impact on the evolution of continental geomorpholo...
2022-03-29
The Neoproterozoic was a very important period in the global tectonic evolution, during which the assembly and breakup of the Supercontinent Rodinia occurred. Central Asian blocks such as the Tarim Craton, Yili, and Central Tianshan preserved rich geological records such as Proterozoic stratigraphy, structural deformation, metamorphism and magmatism (Figure 1). Domestic scholars have also noticed ...
2022-02-23
For the landfalling tropical cyclones (TCs) over the western North Pacific, the intrusion of dry air into the TCs is extensive and significant since the dry air may come from both a high-pressure system and the dry mid-to-high-latitude continent. Under the dry environment, the sea-salt aerosols (SSAs) appear to be coated inhomogeneous spheres according to previous findings. However, the physical p...
2022-02-22
Higher mode information of surface waves is important in dispersion curve inversion for shear wave velocity structure. The frequency–Bessel (F-J) transform method is an effective tool for multimode surface wave extraction. The measured dispersion energy with the F-J method, however, would usually be contaminated by a type of ‘crossed’ artefacts at high frequencies. Xi et al. (2021) propose a mod...
2022-02-22
Seismic interferometry is becoming increasingly popular in urban areas due to its ability to retrieve high-frequency surface waves from abundant anthropogenic seismic noise, hence the need for advanced processing schemes in resolving complex environments. Liu et al. (2021) obtain the multichannel coherency by summing the local phase coherencies in a time window and propose the multichannel-co...
Pseudo-linear-array analysis of passive surface waves based on beamforming
2022-02-22
Linear arrays are usually deployed for passive surface-wave investigations because of their high efficiency and convenience. However, the limited azimuthal coverage lacks the ability to attenuate velocity overestimation caused by directional noise sources. Liu et al. (2020) propose to add two more offline receivers to a conventional linear array for compensating the azimuthal coverage and then the...
Passive surface-wave waveform inversion for source-velocity joint imaging
2022-02-22
Reliable dispersion measurement between two seismic stations is an essential basis of surface wave imaging. Noise source directivity has become an inescapable obstacle and a main concern for passive seismic survey: it basically breaks the principle of Green’s function retrieval in travel-time tomography; moreover, the azimuthal effect of heterogeneous ambient noise sources will inherently cause d...
2022-02-22
Absorption by black carbon (BC) in the atmosphere strongly affects radiative balance and global climate. The large discrepancies in observed and modeled BC absorption enhancements raise a hot debate. Through applying a new 3D shape model based on electron microscope observations, we propose a new framework that estimates BC absorption enhancement through accounting for detailed mixing st...
2022-02-22
Black carbon (BC) is a kind of ubiquitous atmospheric aerosol with strong optical absorption in the atmosphere. BC can influence the regional and global climate by disturbing the energy balance of the earth and atmosphere. At present, it is challenging to precisely estimate the BC optical properties using instruments and numerical models because of its complex morphology and mixing structures in i...
A new 3-D resistivity formulation helps interpretation of the laminated structure in the lower crust
2022-02-22
Deep reflection seismic data reveal that laminated structure is widely developed in the middle-to-lower crust of the continent, but no consensus has been reached for its genesis. Reflective laminated structures ranging from tens of meters to tens of kilometers can be produced by a variety of geological processes, and other physical parameters such as resistivity can constrain the nature of this la...
Traffic-induced surface waves can be used in near-surface imaging
2022-02-22
Accurate understanding of near-surface structures of the solid earth is challenging, especially in urban areas where active source seismic surveys are constrained and difficult to perform. The analysis of anthropogenic seismic noise provides an alternative way to image the shallow subsurface in urban environments. Mi et al. (2022) present a case study of using traffic noise with seismic interferom...
2022-02-22
Dust aerosols have a significant influence on weather, climate and human health due to large mass loading and wide distribution of these aerosols. Irregular dust shapes substantially affect optical properties and light detection and ranging (LiDAR) measurements at short wavelengths. However, dust simulation models have not been fully assessed, which hinders understanding of radiative pro...
2022-02-21
Based on biomarkers and bulk organic carbon isotope, we reconstructed a 5-million-year history of terrestrial material input to the northwest shelf of Australia. Vegetational organic input continuously decreased through the Pliocene-Pleistocene period due to decreased vegetation coverage and discharge under general aridification process. Triggered by lowered sea level and drier climates, soil inpu...
Exhumation in the Namche Barwa syntaxis, eastern Himalaya
2022-02-21
The Namche Barwa syntaxis in the eastern Himalaya is rapidly evolving in terms of its tectonics and topography. Here we constrain the exhumation history of the Yigong River to the immediate north of the syntaxis across different time scales using a multidisciplinary approach. Our new thermochronometric data reveal an acceleration of exhumation rates since 2 Ma in the downstream of the Yigong. Cosm...
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