Inventory, fluxes and residence times from the depth profiles of naturally occurring 210Pb in marine sediments of Mumbai Harbor Bay
2015
Kumar, Ajay | Rout, Sabyasachi | Karpe, Rupali | Mishra, Manish Kumar | Narayanan, Usha | Singhal, Rakesh Kumar | Ravi, Pazhayath Mana | Tripathi, Raj Mangal
Measurements of the vertical concentration profile of deposited²¹⁰Pb and its parent (²²⁶Ra) in cores of recent marine sediment of Mumbai Harbor Bay (MHB) were made to determine the various depth distribution parameters (sedimentation rate, age of sediment, total inventory, fluxes, residence times, scavenging rate, linear attenuation coefficient and relaxation mass depth). Overall, the profile distributions of²²⁶Ra and²¹⁰Pb showed a decreasing trend with increasing the depth. The mean of sedimentation rate in the studied area was obtained to be about 0.76 cm year⁻¹which corresponds to average age of sediment of about 56 years. The average total deposited²¹⁰Pb for the studied sediment profile was 9.68 k Bq m⁻²and correspondingly the average value of fluxes of total²¹⁰Pb and excess²¹⁰Pb (atmospheric flux) were 0.59 and 0.32 k Bq m⁻² year⁻¹, respectively. The residence time of²¹⁰Pb was in the range of 26–226 years throughout the sediment profile and showed generally an increasing trend from top to bottom. The mean relaxation mass depth (h₀) derived from the depth profile of²¹⁰Pb at the studied area was about 190 kg m⁻². The negative association between clay content of cores and the h₀of²¹⁰Pb indicates that as the clay content increases, the penetration depth of deposited²¹⁰Pb in sediment profile decreases.
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