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Stable-isotope (H, O, and Si) evidence for seasonal variations in hydrology and Si cycling from modern waters in the Nile Basin: implications for interpreting the Quaternary record

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Stable-isotope (H, O, and Si) evidence for seasonal variations in hydrology and Si cycling from modern waters in the Nile Basin: implications for interpreting the Quaternary record. / Cockerton, H. E.; Street-Perrott, F. A.; Leng, M. J. et al.
In: Quaternary Science Reviews, Vol. 66, 15.04.2013, p. 4-21.

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Cockerton HE, Street-Perrott FA, Leng MJ, Barker PA, Horstwood MSA, Pashley V. Stable-isotope (H, O, and Si) evidence for seasonal variations in hydrology and Si cycling from modern waters in the Nile Basin: implications for interpreting the Quaternary record. Quaternary Science Reviews. 2013 Apr 15;66:4-21. doi: 10.1016/j.quascirev.2012.12.005

Author

Cockerton, H. E. ; Street-Perrott, F. A. ; Leng, M. J. et al. / Stable-isotope (H, O, and Si) evidence for seasonal variations in hydrology and Si cycling from modern waters in the Nile Basin : implications for interpreting the Quaternary record. In: Quaternary Science Reviews. 2013 ; Vol. 66. pp. 4-21.

Bibtex

@article{b04eafe9feb6486084b40cd3d5674ba9,
title = "Stable-isotope (H, O, and Si) evidence for seasonal variations in hydrology and Si cycling from modern waters in the Nile Basin: implications for interpreting the Quaternary record",
abstract = "Seasonal variations in hydrology and Si cycling in the Nile Basin were investigated using stable-isotope (H, O, and Si) compositions and dissolved Si (DSi) concentrations of surface waters, as a basis for interpreting lacustrine diatom sequences. delta O-18 ranged from -4.7 to +8.0 parts per thousand in the wet season and +0.6 to +8.8 parts per thousand. in the dry season (through 2009-2011). Higher delta O-18 values during the dry season reflected increased evapotranspiration and open water evaporation under conditions of lower humidity. Progressive downstream enrichment in the heavy isotope O-18 also occurred in response to cumulative evaporative losses from open water bodies and swamps. delta Si-30 values of DSi ranged from +0.48 to +3.45 parts per thousand. during the wet season and +1.54 to +4.66 parts per thousand during the dry season, increasing the previously reported global upper limit for delta Si-30 values in natural waters by 1 parts per thousand. Si-isotope fractionation was most intense during the thy season when demand for DSi by aquatic ecosystems exceeded supply. Progressive downstream enrichment in the heavy isotope Si-30, coupled with decreasing DSi concentrations, represented cumulative Si uptake by diatoms, macrophytes and other Si-accumulating aquatic organisms. The pronounced seasonal variations in DSi concentrations and Si-isotope compositions in the River Nile suggest that its DSi flux to the ocean may have varied significantly on a glacial/interglacial time scale, with important consequences for the marine Si budget and consequently the global C cycle. Anthropogenic impacts were evident in both the water- and Si-isotope datasets, especially during the dry season and along the Main Nile, where water management is most intensive. (C) 2013 Elsevier Ltd. All rights reserved.",
keywords = "UPPER BLUE NILE, MC-ICP-MS, EAST-AFRICA, ATMOSPHERIC CO2, BIOGEOCHEMICAL CYCLE, Diatoms, LAKE VICTORIA, Palaeoclimatology, Hydrological cycle, Oxygen isotopes, BIOGENIC SILICA, Silicon isotopes, LATE PLEISTOCENE DESICCATION, WHITE-NILE, DISSOLVED SILICON, Silicon cycle",
author = "Cockerton, {H. E.} and Street-Perrott, {F. A.} and Leng, {M. J.} and Barker, {P. A.} and Horstwood, {M. S. A.} and V. Pashley",
year = "2013",
month = apr,
day = "15",
doi = "10.1016/j.quascirev.2012.12.005",
language = "English",
volume = "66",
pages = "4--21",
journal = "Quaternary Science Reviews",
issn = "0277-3791",
publisher = "Elsevier Limited",

}

RIS

TY - JOUR

T1 - Stable-isotope (H, O, and Si) evidence for seasonal variations in hydrology and Si cycling from modern waters in the Nile Basin

T2 - implications for interpreting the Quaternary record

AU - Cockerton, H. E.

AU - Street-Perrott, F. A.

AU - Leng, M. J.

AU - Barker, P. A.

AU - Horstwood, M. S. A.

AU - Pashley, V.

PY - 2013/4/15

Y1 - 2013/4/15

N2 - Seasonal variations in hydrology and Si cycling in the Nile Basin were investigated using stable-isotope (H, O, and Si) compositions and dissolved Si (DSi) concentrations of surface waters, as a basis for interpreting lacustrine diatom sequences. delta O-18 ranged from -4.7 to +8.0 parts per thousand in the wet season and +0.6 to +8.8 parts per thousand. in the dry season (through 2009-2011). Higher delta O-18 values during the dry season reflected increased evapotranspiration and open water evaporation under conditions of lower humidity. Progressive downstream enrichment in the heavy isotope O-18 also occurred in response to cumulative evaporative losses from open water bodies and swamps. delta Si-30 values of DSi ranged from +0.48 to +3.45 parts per thousand. during the wet season and +1.54 to +4.66 parts per thousand during the dry season, increasing the previously reported global upper limit for delta Si-30 values in natural waters by 1 parts per thousand. Si-isotope fractionation was most intense during the thy season when demand for DSi by aquatic ecosystems exceeded supply. Progressive downstream enrichment in the heavy isotope Si-30, coupled with decreasing DSi concentrations, represented cumulative Si uptake by diatoms, macrophytes and other Si-accumulating aquatic organisms. The pronounced seasonal variations in DSi concentrations and Si-isotope compositions in the River Nile suggest that its DSi flux to the ocean may have varied significantly on a glacial/interglacial time scale, with important consequences for the marine Si budget and consequently the global C cycle. Anthropogenic impacts were evident in both the water- and Si-isotope datasets, especially during the dry season and along the Main Nile, where water management is most intensive. (C) 2013 Elsevier Ltd. All rights reserved.

AB - Seasonal variations in hydrology and Si cycling in the Nile Basin were investigated using stable-isotope (H, O, and Si) compositions and dissolved Si (DSi) concentrations of surface waters, as a basis for interpreting lacustrine diatom sequences. delta O-18 ranged from -4.7 to +8.0 parts per thousand in the wet season and +0.6 to +8.8 parts per thousand. in the dry season (through 2009-2011). Higher delta O-18 values during the dry season reflected increased evapotranspiration and open water evaporation under conditions of lower humidity. Progressive downstream enrichment in the heavy isotope O-18 also occurred in response to cumulative evaporative losses from open water bodies and swamps. delta Si-30 values of DSi ranged from +0.48 to +3.45 parts per thousand. during the wet season and +1.54 to +4.66 parts per thousand during the dry season, increasing the previously reported global upper limit for delta Si-30 values in natural waters by 1 parts per thousand. Si-isotope fractionation was most intense during the thy season when demand for DSi by aquatic ecosystems exceeded supply. Progressive downstream enrichment in the heavy isotope Si-30, coupled with decreasing DSi concentrations, represented cumulative Si uptake by diatoms, macrophytes and other Si-accumulating aquatic organisms. The pronounced seasonal variations in DSi concentrations and Si-isotope compositions in the River Nile suggest that its DSi flux to the ocean may have varied significantly on a glacial/interglacial time scale, with important consequences for the marine Si budget and consequently the global C cycle. Anthropogenic impacts were evident in both the water- and Si-isotope datasets, especially during the dry season and along the Main Nile, where water management is most intensive. (C) 2013 Elsevier Ltd. All rights reserved.

KW - UPPER BLUE NILE

KW - MC-ICP-MS

KW - EAST-AFRICA

KW - ATMOSPHERIC CO2

KW - BIOGEOCHEMICAL CYCLE

KW - Diatoms

KW - LAKE VICTORIA

KW - Palaeoclimatology

KW - Hydrological cycle

KW - Oxygen isotopes

KW - BIOGENIC SILICA

KW - Silicon isotopes

KW - LATE PLEISTOCENE DESICCATION

KW - WHITE-NILE

KW - DISSOLVED SILICON

KW - Silicon cycle

U2 - 10.1016/j.quascirev.2012.12.005

DO - 10.1016/j.quascirev.2012.12.005

M3 - Journal article

VL - 66

SP - 4

EP - 21

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

SN - 0277-3791

ER -