Li Wei

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Li
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Wei
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  • Article
    Deep high-temperature hydrothermal circulation in a detachment faulting system on the ultra-slow spreading ridge
    (Nature Research, 2020-03-10) Tao, Chunhui ; Seyfried, William E. ; Lowell, Robert P. ; Liu, Yunlong ; Liang, Jin ; Guo, Zhikui ; Ding, Kang ; Zhang, Huatian ; Liu, Jia ; Qiu, Lei ; Egorov, Igor ; Liao, Shili ; Zhao, Minghui ; Zhou, JianPing ; Deng, Xianming ; Li, Huaiming ; Wang, Hanchuang ; Cai, Wei ; Zhang, Guoyin ; Zhou, Hongwei ; Lin, Jian ; Li, Wei
    Coupled magmatic and tectonic activity plays an important role in high-temperature hydrothermal circulation at mid-ocean ridges. The circulation patterns for such systems have been elucidated by microearthquakes and geochemical data over a broad spectrum of spreading rates, but such data have not been generally available for ultra-slow spreading ridges. Here we report new geophysical and fluid geochemical data for high-temperature active hydrothermal venting at Dragon Horn area (49.7°E) on the Southwest Indian Ridge. Twin detachment faults penetrating to the depth of 13 ± 2 km below the seafloor were identified based on the microearthquakes. The geochemical composition of the hydrothermal fluids suggests a long reaction path involving both mafic and ultramafic lithologies. Combined with numerical simulations, our results demonstrate that these hydrothermal fluids could circulate ~ 6 km deeper than the Moho boundary and to much greater depths than those at Trans-Atlantic Geotraverse and Logachev-1 hydrothermal fields on the Mid-Atlantic Ridge.
  • Article
    Axial wind effects on stratification and longitudinal sediment transport in a convergent estuary during wet season
    (American Geophysical Union, 2020-01-17) Chen, Lianghong ; Gong, Wenping ; Scully, Malcolm E. ; Zhang, Heng ; Cheng, Weicong ; Li, Wei
    The Coupled Ocean‐Atmosphere‐Wave‐Sediment Transport (COAWST) modeling system was used to examine axial wind effects on vertical stratification and sediment transport in a convergent estuary. The model demonstrated that stratification dynamics in the upper estuary (Kelvin number <1; Ke= fB/√ g'hs) are dominated by longitudinal wind straining, whereas the dominant mechanism governing estuarine stratification in the lower estuary (Kelvin number ~1) is lateral wind straining. Barotropic advection contributes to seaward sediment transport and peaks during spring tides, whereas estuarine circulation causes landward sediment transport with a maximum during neap tides. Down‐estuary winds impose no obvious effects on longitudinal sediment flux, whereas up‐estuary winds contribute to enhanced seaward sediment flux by increasing the tidal oscillatory flux. The model also demonstrates that bottom friction is significantly influenced by vertical stratification over channel regions, which is indirectly affected by axial winds.
  • Article
    GiardiaDB and TrichDB : integrated genomic resources for the eukaryotic protist pathogens Giardia lamblia and Trichomonas vaginalis
    (Oxford University Press, 2008-09-29) Aurrecoechea, Cristina ; Brestelli, John ; Brunk, Brian P. ; Carlton, Jane M. ; Dommer, Jennifer ; Fischer, Steve ; Gajria, Bindu ; Gao, Xin ; Gingle, Alan ; Grant, Greg ; Harb, Omar S. ; Heiges, Mark ; Innamorato, Frank ; Iodice, John ; Kissinger, Jessica C. ; Kraemer, Eileen ; Li, Wei ; Miller, John A. ; Morrison, Hilary G. ; Nayak, Vishal ; Pennington, Cary ; Pinney, Deborah F. ; Roos, David S. ; Ross, Chris ; Stoeckert, Christian J. ; Sullivan, Steven ; Treatman, Charles ; Wang, Haiming
    GiardiaDB (http://GiardiaDB.org) and TrichDB (http://TrichDB.org) house the genome databases for Giardia lamblia and Trichomonas vaginalis, respectively, and represent the latest additions to the EuPathDB (http://EuPathDB.org) family of functional genomic databases. GiardiaDB and TrichDB employ the same framework as other EuPathDB sites (CryptoDB, PlasmoDB and ToxoDB), supporting fully integrated and searchable databases. Genomic-scale data available via these resources may be queried based on BLAST searches, annotation keywords and gene ID searches, GO terms, sequence motifs and other protein characteristics. Functional queries may also be formulated, based on transcript and protein expression data from a variety of platforms. Phylogenetic relationships may also be interrogated. The ability to combine the results from independent queries, and to store queries and query results for future use facilitates complex, genome-wide mining of functional genomic data.
  • Article
    Scientific access into Mercer Subglacial Lake: scientific objectives, drilling operations and initial observations
    (Cambridge University Press, 2021-01-08) Priscu, John C. ; Kalin, Jonas ; Winans, John ; Campbell, Timothy ; Siegfried, Matthew R. ; Skidmore, Mark ; Dore, John E. ; Leventer, Amy ; Harwood, David M. ; Duling, Dennis ; Zook, Robert ; Burnett, Justin ; Gibson, Dar ; Krula, Edward ; Mironov, Anatoly ; McManis, James ; Roberts, Graham ; Rosenheim, Brad E. ; Christner, Brent C. ; Kasic, Kathy ; Fricker, Helen A. ; Lyons, W. Berry ; Barker, Joel ; Bowling, Mark ; Collins, Billy ; Davis, Christina ; Gagnon, Alan R. ; Gardner, Christopher B. ; Gustafson, Chloe ; Kim, Ok-Sun ; Li, Wei ; Michaud, Alex ; Patterson, Molly O. ; Tranter, Martyn ; Venturelli, Ryan ; Vick-Majors, Trista ; Elsworth, Cooper
    The Subglacial Antarctic Lakes Scientific Access (SALSA) Project accessed Mercer Subglacial Lake using environmentally clean hot-water drilling to examine interactions among ice, water, sediment, rock, microbes and carbon reservoirs within the lake water column and underlying sediments. A ~0.4 m diameter borehole was melted through 1087 m of ice and maintained over ~10 days, allowing observation of ice properties and collection of water and sediment with various tools. Over this period, SALSA collected: 60 L of lake water and 10 L of deep borehole water; microbes >0.2 μm in diameter from in situ filtration of ~100 L of lake water; 10 multicores 0.32–0.49 m long; 1.0 and 1.76 m long gravity cores; three conductivity–temperature–depth profiles of borehole and lake water; five discrete depth current meter measurements in the lake and images of ice, the lake water–ice interface and lake sediments. Temperature and conductivity data showed the hydrodynamic character of water mixing between the borehole and lake after entry. Models simulating melting of the ~6 m thick basal accreted ice layer imply that debris fall-out through the ~15 m water column to the lake sediments from borehole melting had little effect on the stratigraphy of surficial sediment cores.