Holocene Climate Variability from Lake Sediment Core in Larsemann Hills, Antarctica

Govil, Pawan; Mazumder, Abhijit; Tiwari, Abhishek; Kumar, Sandeep

doi:10.1007/s12594-011-0064-x

Cited by 7 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several studies have been made on lake sediments from Schirmacher Oasis and Larsemann Hills in Antarctica to better understand the past changes in lacustrine environments (Govil et al, 2011(Govil et al, , 2012Shrivastava et al, 2012;Asthana et al, 2013). Phartiyal et al, (2011) have tried to reconstruct the evolution of the Schirmacher Oasis from 13 ka BP to the present.…”

Section: Palaeoclimatic Reconstruction Using Antarctic Lake Recordsmentioning

confidence: 99%

“…The results show a drastic reduction in the lake sizes by negative water balance and can possibly be attributed to the combined effect of recession of glaciers feeding them, low melt water, low precipitation and strong winds. Govil et al (2011Govil et al ( , 2012 analyzed a sediment core from Larsemann Hills, East Antarctica to reconstruct the paleoproductivity fluctuations and factors responsible for it, based on Biogenic Silica (BSi), Sand (%) and Total Organic Carbon (TOC). The core show prominent high productivity from ~8.3 to ~6 cal ka BP in comparison to less productivity in midlate Holocene (~6 cal ka BP to recent).…”

Section: Palaeoclimatic Reconstruction Using Antarctic Lake Recordsmentioning

confidence: 99%

See 1 more Smart Citation

Palaeoclimatic records from Antarctica and Southern Ocean: A review of Indian contributions

Thamban

2020

Episodes

View full text Add to dashboard Cite

Polar regions are highly sensitive to climate change and are crucial for regulating the Earth's climate. While the past climatic changes were forced differently than the ongoing and future anthropogenic changes, such periods may provide insights into potential future climate impacts and ecosystem feedbacks, especially over centennial-to-millennial timescales that are often not covered by climate model simulations. As part of the initiatives to better understand the polar climate system and its global linkages, Indian scientists have been undertaking palaeoclimatic studies, mainly from the Antarctica, its margins and the surrounding Southern Ocean. Antarctic palaeoclimate records come primarily from proxy records of ice cores or marine and lake sediment cores. Among ice core records, the Indian contributions have been focussing on a network of annually resolved shallow depth ice cores to reconstruct the Antarctic climate variability and its regional and global climatic teleconnections, especially during the past few centuries. Compared to this, the Antarctic lake sediment records have focussed on long-term climate variability, especially during the late Quaternary. Recently, as part of the collaborative initiatives under the International Ocean Discovery Program, Indian scientists have been studying longer sedimentary records from the Antarctic continental margin that offer opportunity to study the evolution and dynamics of the Antarctic ice sheets since their formation during the Cenozoic.

show abstract

Section: Palaeoclimatic Reconstruction Using Antarctic Lake Recordsmentioning

confidence: 99%

Section: Palaeoclimatic Reconstruction Using Antarctic Lake Recordsmentioning

confidence: 99%

Palaeoclimatic records from Antarctica and Southern Ocean: A review of Indian contributions

Thamban

2020

Episodes

View full text Add to dashboard Cite

show abstract

Biogenic Si analysis in volcanically imprinted lacustrine systems: the case of Lake Rutundu (Mt. Kenya)

et al. 2015

View full text Add to dashboard Cite

Diatoms are important primary producers in lake ecosystems and, as a sink for dissolved (DSi) and biogenic silica (BSi) originating from land, can significantly impact the global Si cycle. After burial in lake sediments, resistant diatom frustules can also be used for reconstructions of past ecosystem change. The BSi content of lake sediments is thus often used as a proxy for past diatom productivity, and measured using a time-step analysis of Si extracted in 0.1 M Na2CO3. However, studies in soils and ocean sediments have shown that also certain non-biogenic Si fractions are prone to dissolve in alkaline solutions, contributing to a potential overestimate of sedimentary BSi concentration. In lakes, volcanic and terrestrial Si compounds reactive at high pH are likely to interfere with the analysis. In this study we used a continuous analysis of Si and Al extracted in 0.5 M NaOH and a new mathematical model improved from Koning et al. (Aquat Geochem 8:37-67, 2002) to distinguish between biogenic and non-biogenic Si fractions in lake-sediment extracts. We tested this approach in 43 samples of a 19,000-year sediment sequence recovered from Lake Rutundu, a volcanic crater lake on Mt. Kenya. Our results show that a significant fraction of the extractable Si is of non-biogenic origin, especially in the part of the sequence deposited during the glacial period. We conclude that this technique is essential for the characterization of different Si phases, and in particular the diatom-derived BSi, in the sediment of lakes situated in volcanic catchments. It allows calculating a correction, based on the distinct Si:Al ratio of each of those Si phases, that eliminates the contribution from non-BSi fractions

show abstract

Sediment composition and its effect on the productivity in Larsemann Hills, East Antarctica

et al. 2018

View full text Add to dashboard Cite

Holocene Climate Variability from Lake Sediment Core in Larsemann Hills, Antarctica

Cited by 7 publications

References 28 publications

Palaeoclimatic records from Antarctica and Southern Ocean: A review of Indian contributions

Palaeoclimatic records from Antarctica and Southern Ocean: A review of Indian contributions

Biogenic Si analysis in volcanically imprinted lacustrine systems: the case of Lake Rutundu (Mt. Kenya)

Sediment composition and its effect on the productivity in Larsemann Hills, East Antarctica

Contact Info

Product

Resources

About