Park, H., & Schlesinger, W. (2002). Global biochemical cycle of boron. Global Biogeochemical Cycles, 16, 1072.
Abstract: 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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Pearce, C. R., Parkinson, I. J., Gaillardet, J., Chetelat, B., & Burton, K. W. (2015). Characterising the stable (δ88/86Sr) and radiogenic (87Sr/86Sr) isotopic composition of strontium in rainwater. Chemical Geology, 409, 54–60.
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Mazor, E. (2003). Chemical and isotopic groundwater hydrology (Vol. 98). CRC press.
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Merkel, B., Planer-Friedrich, B., & Nordstrom, D. (2008). Groundwater Geochemistry: A Practical Guide to Modeling of Natural and Contaminated Aquatic Systems. Groundwater Geochemistry, by B.J. Merkel and B. Planer-Friedrich. Edited by D.K. Nordstrom. Berlin: Springer, 2008. ISBN: 978-3-540-74667-6, .
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Mahindawansha, A., Külls, C., Kraft, P., & Breuer, L. (2019). Estimating water flux and evaporation losses using stable isotopes of soil water from irrigated agricultural crops in tropical humid regions. Hydrology and Earth System Sciences Discussions, 2019, 1–28.
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