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Author Kumar, Ajay ♦ Rout, Sabyasachi ♦ Karpe, Rupali ♦ Mishra, Manish Kumar ♦ Narayanan, Usha ♦ Singhal, Rakesh Kumar ♦ Ravi, Pazhayath Mana ♦ Tripathi, Raj Mangal
Source SpringerLink
Content type Text
Publisher Springer Berlin Heidelberg
File Format PDF
Copyright Year ©2014
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences
Subject Keyword Depth profile ♦ Sedimentation rate ♦ Flux ♦ Residence time ♦ Relaxation mass depth ♦ Geology ♦ Hydrology/Water Resources ♦ Geochemistry ♦ Environmental Science and Engineering ♦ Terrestrial Pollution ♦ Biogeosciences
Abstract Measurements of the vertical concentration profile of deposited $^{210}$Pb and its parent ($^{226}$Ra) 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 of $^{226}$Ra and $^{210}$Pb 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$^{−1}$ which corresponds to average age of sediment of about 56 years. The average total deposited $^{210}$Pb for the studied sediment profile was 9.68 k Bq m$^{−2}$ and correspondingly the average value of fluxes of total $^{210}$Pb and excess $^{210}$Pb (atmospheric flux) were 0.59 and 0.32 k Bq m$^{−2 }$year$^{−1}$, respectively. The residence time of $^{210}$Pb 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 (h$_{0}$) derived from the depth profile of $^{210}$Pb at the studied area was about 190 kg m$^{−2}$. The negative association between clay content of cores and the h$_{0}$ of $^{210}$Pb indicates that as the clay content increases, the penetration depth of deposited $^{210}$Pb in sediment profile decreases.
ISSN 18666280
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2014-09-21
Publisher Place Berlin, Heidelberg
e-ISSN 18666299
Journal Environmental Earth Sciences
Volume Number 73
Issue Number 8
Page Count 13
Starting Page 4019
Ending Page 4031

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Source: SpringerLink