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Exchange Dynamics of Typical Emerging and Legacy Persistent Organic Pollutants at the Air-Water Interface Over a Strongly Human-Influenced Large River Estuary 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Guo, Tianfeng;  Li, Yuanyuan;  Lin, Tian;  Wu, Zilan;  Jiang, Yuqing;  Guo, Zhigang
收藏  |  浏览/下载:23/0  |  提交时间:2020/08/18
BDE-209  PCB  air-water gas exchange  transport pathway  source-sink fate  
Atmospheric Freshwater Transport From the Atlantic to the Pacific Ocean: A Lagrangian Analysis 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (6)
作者:  Dey, Dipanjan;  Doos, Kristofer
收藏  |  浏览/下载:15/0  |  提交时间:2020/07/02
Atlantic to Pacific atmospheric water-mass transport  the westerlies transport approximately twice as much water as the easterly trade winds  atmospheric Lagrangian water trajectories  
Ice front blocking of ocean heat transport to an Antarctic ice shelf 期刊论文
NATURE, 2020, 578 (7796) : 568-+
作者:  Alexandrov, Ludmil B.;  Kim, Jaegil;  Haradhvala, Nicholas J.;  Huang, Mi Ni;  Ng, Alvin Wei Tian;  Wu, Yang;  Boot, Arnoud;  Covington, Kyle R.;  Gordenin, Dmitry A.;  Bergstrom, Erik N.;  Islam, S. M. Ashiqul;  Lopez-Bigas, Nuria;  Klimczak, Leszek J.;  McPherson, John R.;  Morganella, Sandro;  Sabarinathan, Radhakrishnan;  Wheeler, David A.;  Mustonen, Ville;  Getz, Gad;  Rozen, Steven G.;  Stratton, Michael R.
收藏  |  浏览/下载:44/0  |  提交时间:2020/05/13

The front of the Getz Ice Shelf in West Antarctica creates an abrupt topographic step that deflects ocean currents, suppressing 70% of the heat delivery to the ice sheet.


Mass loss from the Antarctic Ice Sheet to the ocean has increased in recent decades, largely because the thinning of its floating ice shelves has allowed the outflow of grounded ice to accelerate(1,2). Enhanced basal melting of the ice shelves is thought to be the ultimate driver of change(2,3), motivating a recent focus on the processes that control ocean heat transport onto and across the seabed of the Antarctic continental shelf towards the ice(4-6). However, the shoreward heat flux typically far exceeds that required to match observed melt rates(2,7,8), suggesting that other critical controls exist. Here we show that the depth-independent (barotropic) component of the heat flow towards an ice shelf is blocked by the marked step shape of the ice front, and that only the depth-varying (baroclinic) component, which is typically much smaller, can enter the sub-ice cavity. Our results arise from direct observations of the Getz Ice Shelf system and laboratory experiments on a rotating platform. A similar blocking of the barotropic component may occur in other areas with comparable ice-bathymetry configurations, which may explain why changes in the density structure of the water column have been found to be a better indicator of basal melt rate variability than the heat transported onto the continental shelf(9). Representing the step topography of the ice front accurately in models is thus important for simulating ocean heat fluxes and induced melt rates.


  
A mycobacterial ABC transporter mediates the uptake of hydrophilic compounds 期刊论文
NATURE, 2020, 580 (7803) : 409-+
作者:  Al-Shayeb, Basem;  Sachdeva, Rohan;  Chen, Lin-Xing;  Ward, Fred;  Munk, Patrick;  Devoto, Audra;  Castelle, Cindy J.;  Olm, Matthew R.;  Bouma-Gregson, Keith;  Amano, Yuki;  He, Christine;  Meheust, Raphael;  Brooks, Brandon;  Thomas, Alex;  Levy, Adi;  Matheus-Carnevali, Paula;  Sun, Christine;  Goltsman, Daniela S. A.;  Borton, Mikayla A.;  Sharrar, Allison;  Jaffe, Alexander L.;  Nelson, Tara C.;  Kantor, Rose;  Keren, Ray;  Lane, Katherine R.;  Farag, Ibrahim F.;  Lei, Shufei;  Finstad, Kari;  Amundson, Ronald;  Anantharaman, Karthik;  Zhou, Jinglie;  Probst, Alexander J.;  Power, Mary E.;  Tringe, Susannah G.;  Li, Wen-Jun;  Wrighton, Kelly;  Harrison, Sue;  Morowitz, Michael;  Relman, David A.;  Doudna, Jennifer A.;  Lehours, Anne-Catherine;  Warren, Lesley;  Cate, Jamie H. D.;  Santini, Joanne M.;  Banfield, Jillian F.
收藏  |  浏览/下载:67/0  |  提交时间:2020/07/03

Mycobacterium tuberculosis (Mtb) is an obligate human pathogen and the causative agent of tuberculosis(1-3). Although Mtb can synthesize vitamin B-12 (cobalamin) de novo, uptake of cobalamin has been linked to pathogenesis of tuberculosis2. Mtb does not encode any characterized cobalamin transporter(4-6)  however, the gene rv1819c was found to be essential for uptake of cobalamin(1). This result is difficult to reconcile with the original annotation of Rv1819c as a protein implicated in the transport of antimicrobial peptides such as bleomycin(7). In addition, uptake of cobalamin seems inconsistent with the amino acid sequence, which suggests that Rv1819c has a bacterial ATP-binding cassette (ABC)-exporter fold1. Here, we present structures of Rv1819c, which reveal that the protein indeed contains the ABC-exporter fold, as well as a large water-filled cavity of about 7,700 angstrom(3), which enables the protein to transport the unrelated hydrophilic compounds bleomycin and cobalamin. On the basis of these structures, we propose that Rv1819c is a multi-solute transporter for hydrophilic molecules, analogous to the multidrug exporters of the ABC transporter family, which pump out structurally diverse hydrophobic compounds from cells(8-11).


  
A Mathematical Model for the Release, Transport, and Retention of Per- and Polyfluoroalkyl Substances (PFAS) in the Vadose Zone 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (2)
作者:  Guo, Bo;  Zeng, Jicai;  Brusseau, Mark L.
收藏  |  浏览/下载:21/0  |  提交时间:2020/07/02
PFAS  PFOS  air-water interface  variably saturated flow  retardation  transport  
Growing-season temperature and precipitation are independent drivers of global variation in xylem hydraulic conductivity 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  He, Pengcheng;  Gleason, Sean M.;  Wright, Ian J.;  Weng, Ensheng;  Liu, Hui;  Zhu, Shidan;  Lu, Mingzhen;  Luo, Qi;  Li, Ronghua;  Wu, Guilin;  Yan, Enrong;  Song, Yanjun;  Mi, Xiangcheng;  Hao, Guangyou;  Reich, Peter B.;  Wang, Yingping;  Ellsworth, David S.;  Ye, Qing
收藏  |  浏览/下载:42/0  |  提交时间:2020/02/17
biome  climate  functional types  hydraulic diversity  species distribution  water transport  
Ocean Heat Transport Into the Barents Sea: Distinct Controls on the Upward Trend and Interannual Variability 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (22) : 13180-13190
作者:  Wang, Qiang;  Wang, Xuezhu;  Wekerle, Claudia;  Danilov, Sergey;  Jung, Thomas;  Koldunov, Nikolay;  Lind, Sigrid;  Sein, Dmitry;  Shu, Qi;  Sidorenko, Dmitry
收藏  |  浏览/下载:19/0  |  提交时间:2020/02/17
Barents Sea  Atlantic Water  heat transport  subpolar North Atlantic  wind forcing  Nordic Seas  
Sensitivity of land precipitation to surface evapotranspiration: a nonlocal perspective based on water vapor transport 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (21) : 12588-12597
作者:  Wei, Jiangfeng;  Dirmeyer, Paul A.
收藏  |  浏览/下载:13/0  |  提交时间:2020/02/17
land-atmosphere interactions  water vapor transport  evapotranspiration  
Analysis of the Effects of Dam Release Properties and Ambient Groundwater Flow on Surface Water-Groundwater Exchange Over a 100-km-Long Reach 期刊论文
WATER RESOURCES RESEARCH, 2019
作者:  Ferencz, Stephen B.;  Cardenas, M. Bayani;  Neilson, Bethany T.
收藏  |  浏览/下载:19/0  |  提交时间:2019/11/27
hydropeaking  surface water-groundwater interactions  modeling  dams  hyporheic  solute transport  
Synoptic moisture pathways associated with mean and extreme precipitation over Canada for winter and spring 期刊论文
CLIMATE DYNAMICS, 2019, 53: 2663-2681
作者:  Tan, Xuezhi;  Gan, Thian Yew;  Chen, Yongqin David
收藏  |  浏览/下载:16/0  |  提交时间:2019/11/27
Vertically integrated water vapor transport  Synoptic patterns  Large-scale meteorological patterns  Seasonal precipitation  Extreme precipitation  Self-organizing maps  climate anomalies