| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
XIA Zhiying, RAN Lihua, MARTIN G Wiesner, LIANG Yuzhao, REN Jian, LI Dongling. Impact of ash precipitation on marine environments and diatoms: A case of 1991 from the Pinatubo volcano in the South China Sea[J]. Marine Geology & Quaternary Geology, 2022, 42(2): 28-35. doi: 10.16562/j.cnki.0256-1492.2021051402
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Impact of ash precipitation on marine environments and diatoms: A case of 1991 from the Pinatubo volcano in the South China Sea
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Abstract
The abundance and species composition of diatoms and sinking particles in the surface sediments of the South China Sea (SCS) before and after the 1991 eruption of Pinatubo volcano are analyzed in this work, in order to better reveal the impact of ash precipitation on marine diatoms. It is found that the precipitation of volcanic ash apparently increases the sedimentation rate, and dilutes the other components of the surface sediments, as the result, the relative abundance of diatoms in the surface sediments is significantly decreased. The records of sinking particles further suggest that the ash precipitation has a long-term effect to the sea environment. Both the total sinking particle flux and biogenic silica (BSi) flux in the deep water of central SCS increased substantially one year after the eruption, as the relative abundance and flux of diatoms and other siliceous organisms decreased significantly. The relative abundance decreased from 2.20×108 to 5.48×107 individuals g−1, and the flux of diatoms decreased from 2.90×107 to 8.57×106 individuals m−2 d−1. The apparent decrease in siliceous organism fluxes is attributed to the depressed productivity in the central SCS, that might be related to Pinatubo ash falling, or the impact of the El Niño in 1991. On the other hand, the increase in “BSi” flux one year after the eruption is more likely resulted from the dissolution of volcanic glass during measurement of BSi in the lab, but not from the increase of biogenic siliceous organism frustules or skeletons. It is found that there is a large amount of volcanic glass in the sinking particles. Further works are necessary to clarify the change in the BSi flux before and after the Pinatubo eruption, the decrease of siliceous organisms, and the impact of volcanic eruption on biogeochemistry and sedimentation dynamics in the SCS.
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Keywords:
- Pinatubo volcano /
- volcanic ash /
- diatom /
- biogenic silica /
- South China Sea
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References
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XIA Zhiying, RAN Lihua, MARTIN G Wiesner, LIANG Yuzhao, REN Jian, LI Dongling. Impact of ash precipitation on marine environments and diatoms: A case of 1991 from the Pinatubo volcano in the South China Sea[J]. Marine Geology & Quaternary Geology, 2022, 42(2): 28-35. doi: 10.16562/j.cnki.0256-1492.2021051402
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Figure 1.
The distribution of Pinatubo volcano ash deposit and site locations in this work
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Figure 2.
Sedimentary profile of the sediment cores and relative abundance of sediment diatomsbefore and after the volcanic eruption
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Figure 3.
Sinking flux of total particulate matter, main components, flux and relative abundance of diatoms and other siliceous organisms in the central SCS before (May 1991) and after (May 1991) Pinatubo eruption
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Figure 4.
Changes in relative abundance of diatom species or groups in the sinking particles before and after the eruption of Mount Pinatubo
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Figure 5.
Scanning electron micrographs of sinking particulate matter collected in the central SCS in May 1991 (left), July 1991 (middle), and May 1992 (right)