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Park, H.; Schlesinger, W. |
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Title |
Global biochemical cycle of boron |
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Journal Article |
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2002 |
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Global Biogeochemical Cycles |
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16 |
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1072 |
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The global Boron (B) cycle is primarily driven by a large flux (1.44 Tg B/yr) through the atmosphere derived from seasalt aerosols. Other significant sources of atmospheric boron include emissions during the combustion of biomass (0.26-0.43 Tg B/yr) and coal, which adds 0.20 Tg B/yr as an anthropogenic contribution. These known inputs to the atmosphere cannot account for the boron removed from the atmosphere during rainfall (3.0 Tg B/yr) and estimated dry deposition (1.3-2.7 Tg B/yr). In addition to atmospheric deposition, rock weathering is a source of boron (0.19 Tg B/yr) for terrestrial ecosystems, and humans mine about 0.31 Tg B/yr from the Earth's crust. More than 4.8 Tg B/yr circulates in the biogeochemical cycle of land plants, and about 0.53-0.63 Tg B/yr is carried from land to sea by rivers. The biogeochemical cycle of boron in the sea includes 4.4 Tg B/yr circulating in the marine biosphere, and an annual loss of 0.47 Tg B/yr to the oceanic crust via a variety of sedimentary processes that collectively remove only a small fraction of the total annual inputs to the oceans. Thus with our current understanding of the global biogeochemistry of B, the atmospheric budget shows outputs > inputs, while the marine compartments show inputs > outputs. Despite these uncertainties, it is clear that the human perturbation of the global B cycle has more than doubled the mobilization of B from the crust and contributes significantly to the B transport in rivers. |
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THL @ luqianxue.zhang @ article |
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94 |
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Pulido-Leboeuf, P.; Pulido-Bosch, A.; Calvache, M.L.; Vallejos, Á.; Andreu, J.M. |
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Strontium, SO42-/Cl- and Mg2+/Ca2+ ratios as tracers for the evolution of seawater into coastal aquifers: the example of Castell de Ferro aquifer (SE Spain) |
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2003 |
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Comptes Rendus Geoscience |
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335 |
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14 |
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1039-1048 |
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Elsevier |
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THL @ luqianxue.zhang @ pulido2003strontium |
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71 |
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Araguás-Araguás, L. |
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Title |
Identification of the mechanisms and origin of salinization of groundwater in coastal aquifers by isotope techniques |
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2003 |
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Tecnología de la intrusión de agua de mar en acuíferos costeros, Países Mediterráneos |
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365-371 |
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When assessing the origin of salinity and the mechanisms of salinization in coastal aquifers, hydrogeologists may consider the combined use of certain geochemical tools to assess critical aspects of the hydrogeological setting of the system. These tools are based in the integrated use of chemical (major ions, trace elements and ionic ratios) and isotope parameters (oxygen, hydrogen, sulphur, carbon, strontium and boron). The problem of groundwater salinization in coastal aquifers, besides active seawater intrusion, may be affected by several human activities that accelerate the progressive deterioration of water quality, such as concentrated pumping, intensive agricultural practices including return flows or reuse of waste waters from urban or industrial origin. The characterisation of the perating processes and mechanisms of salinization is a requisite for a proper management of groundwater resources and for adopting remediation strategies. In this contribution the potential role of several isotopic tools in these studies is briefly described. |
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THL @ christoph.kuells @ article |
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86 |
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Mazor, E. |
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Chemical and isotopic groundwater hydrology |
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2003 |
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98 |
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CRC press |
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THL @ luqianxue.zhang @ mazor2003chemical |
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102 |
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Wackernagel*, H. |
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Multivariate geostatistics |
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2003 |
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Springer-Verlag Berlin Heidelberg |
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978-3-662-05294-5 |
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CUT @ phaedon.kyriakidis @ Wackernagel2003 |
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161 |
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