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Insights into the 3D thermal structure of interplate earthquakes in the Colombia–Ecuador subduction zone

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Earth and Planetary Physics 2025年第02期9卷 279-288页

作者： Rui Qu YingFeng Ji WeiLing Zhu Ye Zhu Haris Faheem State key laboratory of tibetan plateau Earth System Environment and Resources (TPESER) Institute of Tibetan Plateau Research Chinese Academy of Sciences University of Chinese Academy of Sciences

Throughout the 20th century, several large megathrust earthquakes were observed in the Colombia–Ecuador subduction zone which widely ruptured plate interfaces, causing considerable damage and loss of life. The occurrence of earthquakes in subduction zones is thought to be closely related to the thermal structure of the incoming plate. However, in the case of the subducting Nazca Plate beneath the Colombia–Ecuador zone, the thermal structure remains unclear, especially its hydraulic distribution. On the basis of 3D thermal models, we present new insights into the plate interface conditions of Colombia–Ecuador interplate and megathrust earthquakes. We show that the plate geometry strongly affects the along-strike thermal structure of the slab beneath Colombia and Ecuador, with the subduction of the Carnegie Ridge playing an important role. Our results further reveal that the unique geometry of the Nazca Plate is the primary reason for the relatively high temperatures of the slab beneath Colombia. We suggest that the positions of the100–200 °C and 350–450 °C isotherms on the plate interface determine the updip and downdip limits of the seismogenic zone. For Colombia–Ecuador interplate earthquakes, the released fluids control the distribution of shallow-depth earthquakes, whereas the age and geometry of the slab control the distribution of intermediate-depth earthquakes. The average temperature of the plate interface at the upper limit of large megathrust earthquakes is hotter than previously thought, which is more consistent with our understanding of the Colombia–Ecuador subduction zone. We predict that the potential location of future large seismic events could be in the rupture zone of past seismic events or offshore of northern Colombia.

关键词： thermal structure interplate earthquakes plate geometry Colombia-Ecuador 3D modeling

Impact of human activities on the long-term change and seasonal variability of Ebinur Lake,Northwest China

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Science China Earth Sciences 2025年第2期68卷 473-486页

作者： Haoxin DENG Qiuhong TANG Zhidong ZHANG Xingcai LIU Gang ZHAO Shibo CUI Zhiping ZHANG Shuai SHAO Jianbao LIU Fahu CHEN key laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State key laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China School of Geography Nanjing Normal UniversityNanjing 210023China Group of Alpine Paleoecology and Human Adaptation(ALPHA) State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Inland lakes in arid Central Asia are particularly susceptible to the impact of climate change and human *** Lake,the largest salt inland lake in Xinjiang,Northwest China,has experienced rapid shrinkage,with human activities identified as the primary influencing ***,it remains unclear how human water use in different sectors,such as irrigation,husbandry,and industry,is responsible for the long-term change and seasonal variability of the lake area under changing *** study aims to address this knowledge gap by developing an integrated hydrological-socioeconomic-lake model that simulates the changes in the Ebinur Lake area during the period of 1950–*** simulated lake area changes under different model experiments were then compared with separate the impacts of climate change and human water use of different *** results indicate that climate change,irrigation,husbandry,and industry water uses have contributed+5%,-79%,-25%,and-1%of the long-term change in the lake area,*** climate change alone increasing the lake area,the increase in human water use has resulted in the persistent decline of Ebinur ***,husbandry water use emerges as a significant contributor to lake shrinkage,accounting for approximately one-third of the impact of ***,irrigation water use has contributed to the enhanced seasonal variability,as indicated by the difference between the maximum and minimum monthly lake area in a *** difference has increased from 120 km2in the 1950s to 183 km2in the 2010s.

关键词： Ebinur Lake Climate change Irrigation Seasonal variability Hydrological-socioeconomic-lake model

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Tree rings uncover dynamic linkages of Earth spheres

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Science Bulletin 2025年第3期70卷 313-316页

作者： Shan Gao Eryuan Liang JJulio Camarero Haifeng Zhu Josep Peñuelas Shilong Piao Fahu Chen State key laboratory of tibetan plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Instituto Pirenaico de Ecología(IPE-CSIC) Zaragoza 50059Spain CREAF Cerdanyola del VallesBarcelona 08193Spain CSIC Global Ecology Unit CREAF-CSIC-UABBarcelona 08193Spain

The spheres of the Earth—specifically the lithosphere,hydrosphere,atmosphere,and biosphere—are intricately connected and interact through the fluxes of matter and energy,forming a complex and ever-evolving Earth *** the dynamic linkages between these spheres during different types of forcings or events is essential for predicting changes and securing a sustainable future for living organisms,particularly ***,uncovering these linkages is challenging due to the need for suitable proxies that can demonstrate how these systems or spheres change across diverse temporal and spatial scales.

关键词： Earth forcing scales

Late Paleozoic–Early Mesozoic tectonic evolution of the Zongwulong Shan-qinghai Nanshan tectonic belt in the northern Qaidam continent， northern Tibet

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Journal of Earth Science 2025年

作者： Yonghui Zhao Chen Wu Jie Li Peter J.Haproff Lin Ding State key laboratory of tibetan plateau Earth System and Resources environment (TPESRE)， Institute of tibetan plateau Research， Chinese Academy of Sciences University of Chinese Academy of Sciences Chongqing key laboratory of Complex Oil and Gas Field Exploration and Development， Chongqing University of Science and Technology Department of Earth and Ocean Sciences， University of North Carolina Wilmington

The Zongwulong Shan-qinghai Nanshan tectonic belt of the northern Tibet plateau experienced a protracted tectonic history， including the openings and closures of the Proto- and Paleo-Tethyan Oceans. Although the tectonic belt has been extensively studied， details regarding the tectonic processes involved in its development remain controversial. To better constrain the tectonic processes of this tectonic belt， we conducted detailed field geological mapping， zircon U-Pb geochronology， and whole-rock geochemical and Sr-Nd isotopic analyses. Our results show that intrusive rocks in the tectonic belt crystallized in ca. 292–233 Ma， perhaps in an arc/subduction setting. Geochemical and Sr-Nd isotopic data suggest that early Permian–late Triassic ultramafic-intermediate intrusions were sourced from the enriched mantle， whereas intermediate-acidic rocks were sourced from mixed crust-mantle. We present the tectonic model that involves: (1) Early Devonian–early Permian intracontinental extension occurred in the northern margin of the Qaidam continent (ca. 416 Ma–292 Ma); (2) Early Permian–late Triassic northward subduction of the Paleo-Tethyan Ocean resulted in arc magmatism (ca. 292 Ma–233 Ma); and (3) subsequent late Triassic intracontinental extension (ca. 233 Ma–215 Ma). Our results suggest that the late Paleozoic–early Mesozoic development of the Zongwulong Shan-qinghai Nanshan was related to the opening， subduction， and slab retreat of the Paleo-Tethyan Ocean， which has key implications for the tectonic evolution of the northern tibetan plateau.

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Late Holocene Hydroclimatic Variations at Lake Hurleg,Northeastern Tibet plateau

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Journal of Earth Science 2025年第1期36卷 161-172页

作者： Aiying Cheng Junqing Yu Yun Li Haicheng Wei Chunliang Gao Lisha Zhang key laboratory of Green and High-end Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810000China qinghai Provincial key laboratory of Geology and environment of Salt Lakes Xining 810008China Haixi Prefecture Salt Lake Administration of qinghai Province Delingha 817000China

High-resolution,continuous Late Holocene lacustrine records are scarce in the Qaidam Basin,but is of especially important for our understanding the future climate variability in the western ***,we use grain size,element content and XRD-identified data from the Lake Hurleg in the eastern Qaidam Basin to present the Late Holocene climate variability,which have been temporally constrained using 210Pb-,137Cs-and AMS 14C *** records demonstrate that decreased precipitation climate occurred at~800–1000 yr and~1300–1800 yr intervals,and increased precipitation occurred at~354–800 yr,~1000–1300 yr and~1800 yr to the *** results show that the Qaidam Basin has undergone a process of warming and humidification since the Industrial Revolution,which is consistent with the meteorological *** climate in the northeastern Qaidam Basin is dominated by the Asian Monsoon.

关键词： Late Holocene Qaidam Basin climate change lake sediment

Subduction thermal state, slab metamorphism, and seismicity in the Makran Subduction Zone

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Earth and Planetary Physics 2025年第02期9卷 266-278页

作者： Haris Faheem YingFeng Ji WeiLing Zhu Rui Qu Ye Zhu Shoichi Yoshioka State key laboratory of tibetan plateau Earth System Environment and Resources (TPESER) Institute of Tibetan Plateau Research Chinese Academy of Sciences University of Chinese Academy of Sciences Research Center for Urban Safety and Security Kobe University Department of Planetology Graduate School of Science Kobe University

The dependence of the subduction regime on three-dimensional slab geometry poses a challenge for accurately estimating the evolving thermal structure of megathrusts globally. Although slab dips and ages have gained attention, the specific impacts of oblique subduction remain unmeasured. Here, we present an integrated thermal model that quantifies how slab morphology can shape the thermal state of megathrusts, such as those in the Makran Subduction Zone. The model considers both slab obliquity and depth variations along the trench. We find a considerable match between the slab petrological dehydration zone and the distribution of great crustal earthquakes. We suggest that the accumulation of fluids along megathrusts by slab metamorphism can foster more polarized conditions for decreasing plate coupling and increasing interplate ruptures. It is thus imperative to improve model representation and more realistically represent how drivers of slab geometry affect metamorphic transitions and the occurrence of earthquakes at megathrusts.

关键词： thermal regime slab dehydration earthquake 3-D model Makran Subduction Zone

Increase in the variability of terrestrial carbon uptake in response to enhanced future ENSO modulation

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 32-38页

作者： Younong Li Li Dan Jing Peng Qidong Yang Fuqiang Yang key laboratory of Regional Climate-environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina key laboratory of Atmospheric environment and Processes in the Boundary Layer over the Low-Latitude plateau Region Department of Atmospheric ScienceYunnan UniversityKunmingChina

El Niño-Southern Oscillation(ENSO)is a major driver of climate change in middle and low latitudes and thus strongly influences the terrestrial carbon cycle through land-air *** the ENSO modulation and carbon flux variability are projected to increase in the future,but their connection still needs further *** investigate the impact of future ENSO modulation on carbon flux variability,this study used 10 CMIP6 earth system models to analyze ENSO modulation and carbon flux variability in middle and low latitudes,and their relationship,under different scenarios simulated by CMIP6 *** results show a high consistency in the simulations,with both ENSO modulation and carbon flux variability showing an increasing trend in the *** higher the emissions scenario,especially SSP5-8.5 compared to SSP2-4.5,the greater the increase in *** flux variability in the middle and low latitudes under SSP2-4.5 increases by 30.9%compared to historical levels during 1951-2000,while under SSP5-8.5 it increases by 58.2%.Further analysis suggests that ENSO influences mid-and low-latitude carbon flux variability primarily through *** occurrence may potentially be attributed to the increased responsiveness of gross primary productivity towards regional temperature fluctuations,combined with the intensified influence of ENSO on land surface temperatures.

关键词： Carbon variability ENSO modulation CMIP6 models

Influence of the Scandinavian Pattern on Summer Extreme Precipitation over the Eastern Slopes of the tibetan plateau

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Advances in Atmospheric Sciences 2025年第3期42卷 438-452页

作者： Quanliang CHEN Ziqi ZHANG Yang LI Yujing LIAO Dandan DONG plateau Atmospheric and environment key laboratory of Sichuan Province School of Atmospheric ScienceChengdu University of Information TechnologyChengdu 610225China Shaoxing Yuecheng Meteorological Bureau Shaoxing 312000China Zhejiang Institute of Meteorological Sciences Hangzhou 310008China

The Scandinavian(SCA)pattern is an important climate signal in regulating the variability of summer extreme precipitation(SEP)over the eastern slopes of the tibetan plateau(ESTP).There is a strong negative correlation between the SCA pattern and SEP over the ESTP,with a correlation coefficient *** budget analysis showed that the dynamic component anomalies of both the zonal and vertical moisture advection induced by the SCA pattern play the dominant roles in extreme precipitation variability over the *** anomalies are solely linked to variations in zonal wind and vertical *** anomalies of the SCA pattern propagate downstream through Rossby waves,leading to the formation of cyclonic circulations over northern East Asia and the Iranian *** westerlies on the southern side of these cyclonic circulations play a crucial role in influencing the development of significant anomalous westerlies over the *** anomalous westerlies bring climatologically moist air from the tibetan plateau(TP)to the ESTP,resulting in positive zonal moisture advection anomalies over the ***,these anomalous westerlies transport climatologically warm air from the TP to the ESTP,leading to significant warm advection anomalies and vertical upward motion anomalies over the *** upward motion carries lower-tropospheric moisture upward,resulting in positive vertical moisture advection anomalies over the *** combination of these positive zonal and vertical moisture advection anomalies eventually leads to excessive SEP.

关键词： atmospheric circulation extreme precipitation Scandinavian pattern moisture budget

Different polarity polyphenol extracts from P. cerasifera fruits ameliorate non-alcoholic fatty liver disease via bile acid metabolism and gut microbiota

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Food Science and Human Wellness 2025年

作者： Jiabao Ren Chunlin Hao Helong Han Enpeng He Yanhong Li key laboratory of Special environment biodiversity Application and Regulation in Xinjiang， College of Life Sciences， Xinjiang Normal University key laboratory of Sports Human Sciences， Institute of Physical Education， Xinjiang Normal University

Non-alcoholic fatty liver disease (NAFLD) is a global metabolic disease caused by abnormal accumulation of lipids in the liver， for which effective therapeutic targets and drugs are scarce. P. cerasifera polyphenol extract (PPE) has been proven to be able to alleviate NAFLD via the “gut microbiota - bile acid” signaling pathway， but its active ingredients that exert anti-NAFLD effects are still unclear. In this study， PPE was separated according to different polarities， and the optimal components for exerting anti-NAFLD effects based on the “gut microbiota - bile acid” signaling pathway were explored. Different polarity polyphenol extracts from P. cerasifera， especially aqueous PPE (APPE) enhanced hepatic bile acid synthesis and alleviated liver injury in NAFLD mice. Meanwhile， APPE significantly reduced the levels of BSH-producing bacteria， in particular Bacteroidetes， and reduced the presence of endogenous FXR ligands (CDCA， LCA， and DCA) in the intestines of NAFLD mice， thereby inhibiting the ileal FXR-FGF15 axis. In addition， activation of the hepatic FXR-SHP axis by APPE also supported CYP7A1- and CYP27A1-mediated bile acid synthesis. The data suggested that APPE demonstrated a notable anti-NAFLD effect through the “gut microbiota - bile acid” signaling pathway， indicating the potential for isolating individual compound from APPE for the treatment of NAFLD.

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