TY - JOUR
T1 - The behavior of natural and anthropogenic osmium in the Hudson River-Long Island Sound estuarine system
AU - Turekian, Karl K.
AU - Sharma, Mukul
AU - Gordon, Gwyneth Williams
N1 - Funding Information:
We are grateful to Robert Aller, Kirk Cochran and Bernhard Peucker-Ehrenbrink for help in sample collection; David Zylberberg collected the sample for the Hudson River at Newburgh. Cynthia Chen helped with the preparation of Fig. 1 and Joanne Donoghue helped with the analyses of the samples. Comments from Bernhard Peucker-Ehrenbrink, S. Krishnaswami (AE), and two anonymous reviewers led to substantial revisions and improvements of the manuscript. This study was supported by grants from the National Science Foundation (OCE-0099231, EAR-0130631) to M.S.
PY - 2007/9/1
Y1 - 2007/9/1
N2 - The extent to which riverine Os is trapped in a temperate estuary was the aim of this study. The behavior of Os through the Hudson River, East River and the Long Island Sound (LIS) system is addressed using both natural Os and anthropogenically mobilized Os. The Os concentration ([Os]) and isotopic composition (187Os/188Os) of the Mid-Atlantic Bight as inferred from the analysis of a water sample of 31‰ salinity (S) at Vineyard Sound, MA are 46 fM and 1.070, respectively. In comparison, the Hudson River at Newburgh, NY has [Os] = 68 fM and 187Os/188Os = 1.265. The Os concentration of the East River at the Whitestone Bridge is 51 fM and remains essentially constant proceeding eastward in the LIS despite the increase of salinity from 20‰ towards the higher value of the Mid-Atlantic Bight. The 187Os/188Os ratio of water at Whitestone Bridge is 0.945 and increases eastward through the Sound to 0.979 at 7 km and then to 1.019 at 39.6 km. The behavior of Os through LIS appears to be conservative at S > 20‰. On the basis of Os concentration and isotopic composition we infer that anthropogenic Os is being added to the East River through sewers with the likely isotopic ratio of ∼0.13 and that about 24% of riverine Os must be removed at S ≤ 20‰. There is a net transport of about 0.4-1 mole of anthropogenic Os per year from the East River into the LIS. The residence time of Os in the ocean at present must be about 39,000 years, unless an independent source of supply of Os can be identified.
AB - The extent to which riverine Os is trapped in a temperate estuary was the aim of this study. The behavior of Os through the Hudson River, East River and the Long Island Sound (LIS) system is addressed using both natural Os and anthropogenically mobilized Os. The Os concentration ([Os]) and isotopic composition (187Os/188Os) of the Mid-Atlantic Bight as inferred from the analysis of a water sample of 31‰ salinity (S) at Vineyard Sound, MA are 46 fM and 1.070, respectively. In comparison, the Hudson River at Newburgh, NY has [Os] = 68 fM and 187Os/188Os = 1.265. The Os concentration of the East River at the Whitestone Bridge is 51 fM and remains essentially constant proceeding eastward in the LIS despite the increase of salinity from 20‰ towards the higher value of the Mid-Atlantic Bight. The 187Os/188Os ratio of water at Whitestone Bridge is 0.945 and increases eastward through the Sound to 0.979 at 7 km and then to 1.019 at 39.6 km. The behavior of Os through LIS appears to be conservative at S > 20‰. On the basis of Os concentration and isotopic composition we infer that anthropogenic Os is being added to the East River through sewers with the likely isotopic ratio of ∼0.13 and that about 24% of riverine Os must be removed at S ≤ 20‰. There is a net transport of about 0.4-1 mole of anthropogenic Os per year from the East River into the LIS. The residence time of Os in the ocean at present must be about 39,000 years, unless an independent source of supply of Os can be identified.
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U2 - 10.1016/j.gca.2007.05.020
DO - 10.1016/j.gca.2007.05.020
M3 - Article
AN - SCOPUS:34548186233
SN - 0016-7037
VL - 71
SP - 4135
EP - 4140
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 17
ER -