Auxiliary Material for Paper 2009GC002869


Continental bedrock and riverine fluxes of strontium and neodymium isotopes to the oceans


Bernhard Peucker-Ehrenbrink
Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA
Laboratoire d’Etudes en Geophysique et Oceanographie Spatiale, UPS, CNRS, CNES, IRD, Observatoire Midi-Pyrenees, Toulouse, France

Mark W. Miller
BenchmarkGIS Services, Chapel Hill, North Carolina , USA

Thomas Arsouze and Catherine Jeandel
Laboratoire d’Etudes en Geophysique et Oceanographie Spatiale, UPS, CNRS, CNES, IRD, Observatoire Midi-Pyrenees, Toulouse, France


Peucker-Ehrenbrink, B., M. W. Miller, T. Arsouze, and C. Jeandel (2010), Continental bedrock and riverine fluxes of strontium and neodymium isotopes to the oceans, Geochem. Geophys. Geosyst., 11, Q03016, doi:10.1029/2009GC002869.


Introduction:

The Riverine Sr and Nd isotope dataset (Data Set S1) contains data on drainage basins sizes, annual water discharge (runoff), suspended sediment loads for rivers that have been characterized for Sr and Nd isotope composition and drain into the ocean as well as the Aral and Caspian Seas .  Individual data, referenced to their sources, and "best estimates" (from Peucker-Ehrenbrink, 2009) are listed.  Where critical data (Nd concentrations, suspended sediment fluxes) were missing, regional or global average values have been used (shown in italics).

1. 2009gc002869-ds01.txt, 2009gc002869-ds01.xls
Data Set S1. RiverSrNd.TAB  Drainage basin sizes, annual water discharges (runoff), suspended sediment fluxes, dissolved Sr concentrations and isotope composition, Nd concentration and isotope composition of the suspended particulate load.
1.1. Column "RIVER", name(s) of river. Variations in spelling are indicated in parentheses.
1.2. Column "ID", numeric number (1 to 19) of the large-scale drainage regions as defined by Graham et al. [1999, 2000].
1.3. Column "COUNTRY", name of country/countries where river drains into the ocean/inland sea.
1.4. Column "T", million years, average age of bedrock lithologies weighted by the areal abundance of each lithology within a river drainage basin.  A linear age model has been used (see Peucker-Ehrenbrink and Miller, 2007)
1.5. Column "±", million years, one standard deviation of value in column 1.4.
1.6. Column "Ab", square kilometers, best estimates of drainage basin area, usually the median area estimate. Subscript "b" refers to the "best estimate" listed in Peucker-Ehrenbrink (2009).
1.7. Columns "Qb", cubic kilometers per year, best estimates of annual water discharges (runoff), usually the median of all individual estimates in Peucker-Ehrenbrink (2009) unless pre-human or pre-dam estimates are available. Subscript "b" refers to the "best estimate" listed in Peucker-Ehrenbrink (2009).
1.8. Column "Rb", centimeter per year, subscript "b" refers to best estimate of annual runoff.
1.9. Columns "REF", number of reference listed in the reference list below. Reference refers to data in the column to the right, indicated by a ">" sign. Multiple references for a single estimate indicate that the respective estimate is listed in more than one source.
1.10. Column "c SrD", micrograms per liter, subscript "D" refers to the dissolved Sr concentration.
1.11. Column "87Sr/86SrD", dimensionless isotope ratio, subscript "D" refers to the isotope ratio of the dissolved Sr.
1.12. Column "Q SrD", metric tons per year, annual flux of dissolved Sr.
1.13. Column "Y SrS", kilograms of Sr per year and square kilometer, the specific flux of dissolved Sr per year from one square kilometer of drainage area.  Subscripts "S" and "D" refer to "specific" (to area) and "dissolved", respectively.
1.14. Column "c NdP", microgram per gram, subscript "P" refers to "particulate" Nd concentration.  Missing data for individual rivers were approximated by using the global average Nd concentration of the upper continental crust (McLennan, 2001), shown in italics
1.15. Column "143Nd/144NdP", dimensionless Nd isotope composition, subscript "P" refers to the "particulate" load.
1.16. Column "eNd(0)P", dimensionless Nd isotope composition in epsilon notation, subscript "P" refers to "particulate".  Some of these values (in bold) have been calculated from the 143Nd/144NdP values in column 1.15. by dividing this isotope ratio by 0.51264, subtracting one, and multiplying by 10,000.
1.17. Column "Q NdP", metric tons per year, subscript "P" refers to the annual "particulate" flux of Nd.  Missing data were approximated by using the average value for the respective drainage region, normalized to the water discharge.  Those estimated values are shown in parentheses.
1.18. Column "Q SSP", million tons per year, subscript "P" refers to the annual flux of "particulate" Nd.  Missing data were approximated as above and are shown in italics.
1.19. Column "QS SS", metric tons per year and square kilometer, subscript "S" refers to the "specific" annual flux of suspended particulate matter generated per square kilometer of drainage area.

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