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Global Response of Evapotranspiration Ratio to Climate Conditions and Watershed Characteristics in a Changing Environment 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (7)
作者:  Liu, Zhiyong;  Cheng, Linyin;  Zhou, Guoyi;  Chen, Xiaohong;  Lin, Kairong;  Zhang, Wenfeng;  Chen, Xiuzhi;  Zhou, Ping
收藏  |  浏览/下载：7/0  |  提交时间：2020/07/02
hydrological response  evapotranspiration  watershed characteristics  aridity index  relative contribution  
Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen 期刊论文
NATURE, 2020, 580 (7803) : 367-+
作者:  Zhao, Steven;  Jang, Cholsoon;  Liu, Joyce;  Uehara, Kahealani;  Gilbert, Michael;  Izzo, Luke;  Zeng, Xianfeng;  Trefely, Sophie;  Fernandez, Sully;  Carrer, Alessandro;  Miller, Katelyn D.;  Schug, Zachary T.;  Snyder, Nathaniel W.;  Gade, Terence P.;  Titchenell, Paul M.;  Rabinowitz, Joshua D.;  Wellen, Kathryn E.
收藏  |  浏览/下载：14/0  |  提交时间：2020/05/13

Nitrogen is the main constituent of the Earth'  s atmosphere, but its provenance in the Earth'  s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth'  s accretion versus that subducted from the Earth'  s surface is unclear(1-6). Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare (NN)-N-15-N-15 isotopologue of N-2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle delta N-15 (the fractional difference in N-15/N-14 from air), N-2/Ar-36 and N-2/He-3. Our results show that negative delta N-15 values observed in gases, previously regarded as indicating a mantle origin for nitrogen(7-10), in fact represent dominantly air-derived N-2 that experienced N-15/N-14 fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the (NN)-N-15-N-15 data allow extrapolations that characterize mantle endmember delta N-15, N-2/Ar-36 and N-2/He-3 values. We show that the Eifel region has slightly increased delta N-15 and N-2/Ar-36 values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts(11), consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has delta N-15 values substantially greater than that of the convective mantle, resembling surface components(12-15), its N-2/Ar-36 and N-2/He-3 ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume delta N-15 values may both be dominantly primordial features.


  
Contrasting contributions of flows on different time scales to tropical cyclone tracks over the South China Sea 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (3)
作者:  Cao, Xi;  Wu, Renguang;  Bi, Mingyu
收藏  |  浏览/下载：10/0  |  提交时间：2020/07/02
tropical cyclone track  the South China Sea  relative contribution  different time scales  
Comparison of impacts of intraseasonal oscillation on tropical cyclogenesis over the western North Pacific based on two methods 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019
作者:  Cao, Xi;  Wu, Renguang
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
GPI  ISO  relative contribution  TC genesis  the WNP  
Relative roles of El Nino-induced extratropical and tropical forcing in generating Tropical North Atlantic (TNA) SST anomaly 期刊论文
CLIMATE DYNAMICS, 2019, 53: 3791-3804
作者:  Jiang, Leishan;  Li, Tim
收藏  |  浏览/下载：10/0  |  提交时间：2019/11/27
El Nino  Tropical North Atlantic SSTA  Extratropical forcing  Tropical forcing  Relative contribution  
Vegetation cover-another dominant factor in determining global water resources in forested regions 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (2) : 786-795
作者:  Wei, Xiaohua;  Li, Qiang;  Zhang, Mingfang;  Giles-Hansen, Krysta;  Liu, Wenfei;  Fan, Houbao;  Wang, Yi;  Zhou, Guoyi;  Piao, Shilong;  Liu, Shirong
收藏  |  浏览/下载：7/0  |  提交时间：2019/04/09
climate change  directional interactions  relative contribution  vegetation cover change  water resources