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The Atmospheric Input of Dissolvable Pb Based on the Radioactive 210 Pb Budget in the Equatorial Western Indian Ocean.
- Source :
- Journal of Marine Science & Engineering; Jun2023, Vol. 11 Issue 6, p1120, 12p
- Publication Year :
- 2023
-
Abstract
- To estimate the atmospheric deposition flux of <superscript>210</superscript>Pb in the equatorial western Indian Ocean, we determined the dissolved (<0.45 μm) and particulate <superscript>210</superscript>Pb (>0.45 μm) in the water column. In addition, we calculated the atmosphere-derived dissolvable Pb in seawater using the budget of <superscript>210</superscript>Pb. The dissolved <superscript>210</superscript>Pb and total <superscript>210</superscript>Pb were higher in the surface layer and, overall, showed a decreasing distribution with depth. In particular, radioactive <superscript>210</superscript>Pb activities in the surface-to-upper layer (<1000 m depth) were 1.5 to 2 times higher than those reported in the 1970s (in nearby regions), suggesting that there has been additional <superscript>210</superscript>Pb input in recent years. Based on the mass balance of the total <superscript>210</superscript>Pb budget in the water column, we estimated the atmospheric deposition flux of <superscript>210</superscript>Pb and the residence time of Pb for the first time in this region. The atmospheric deposition flux of <superscript>210</superscript>Pb was estimated to be 0.1–0.5 dpm cm<superscript>−2</superscript> yr<superscript>−1</superscript>, and these values agreed with the general global estimations for the major oceans (0.1–0.7 dpm cm<superscript>−2</superscript> yr<superscript>−1</superscript>). Considering the residence time of <superscript>210</superscript>Pb (29–41 years) in the water column (estimated from the <superscript>210</superscript>Pb inventory and <superscript>234</superscript>Th-based Pb scavenging rate), the atmospheric input of seawater-dissolvable Pb was quantified to be 0.08–0.1 nmol cm<superscript>−2</superscript> yr<superscript>−1</superscript>, which is about eight times higher than the estimated input in the early 1990s in the region. Therefore, these results imply that radioactive <superscript>210</superscript>Pb could be a useful tracer for quantifying Pb flux in seawater. [ABSTRACT FROM AUTHOR]
- Subjects :
- BUDGET
ATMOSPHERIC deposition
OCEAN
SEAWATER
Subjects
Details
- Language :
- English
- ISSN :
- 20771312
- Volume :
- 11
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Marine Science & Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 164650709
- Full Text :
- https://doi.org/10.3390/jmse11061120