1000 years of climate variability in central Asia: assessing the evidence using Lake Baikal (Russia) diatom assemblages and the application of a diatom-inferred model of snow cover on the lake

Mackay, Anson W.; Ryves, David B.; Battarbee, Richard W.; Flower, Roger J.; Jewson, David H.; Rioual, Patrick; Sturm, Michael

doi:10.1016/j.gloplacha.2004.09.021

Cited by 61 publications

(40 citation statements)

References 49 publications

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“…Also, in more recent sediment studies, A. baicalensis has dominated fossil community assemblages (e.g. Bradbury et al, 1994;Mackay et al, 1998Mackay et al, , 2005Battarbee et al, 2005) but accurate interpretation of palaeoecological evidence is dependent on a fuller understanding of the ecology of this species. In a wider context, the morphological adaptations of A. baicalensis show some remarkable similarities (extended mantle length, size and wall thickness) to some of the oldest known diatom fossils found in the Lower Cretaceous sediments from the Antarctic (Gersonde & Harwood, 1990a, 1990b.…”

Section: Discussionmentioning

confidence: 99%

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

Jewson

Granin

Zhdarnov

et al. 2010

European Journal of Phycology

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Aulacoseira baicalensis (K. Meyer) Simonsen is a freshwater planktonic diatom that undergoes large seasonal changes in cell morphology related to changes in vertical mixing. Short cells (10-20 mm) with thin walls were formed under the ice of Lake Baikal but cell lengths increased up to 150 mm by the time mixing depth reached over 100 m in June. These long cells became resting stages that were packed with reserve products and had siliceous walls up to 4 mm thick. Increase in mixing depth gave access to sufficient silica for completion of resting stages in most years but not in high biomass years, which has long-term implications for the population. Wall thickening reduced the risk of dissolution during dormancy but it also reduced cell volume. Therefore, by increasing length, cells maintained storage space for reserves. Seasonal changes in valve length showed that individual valves did not last more than 6 months, equivalent to 5 to 10 divisions. Separation valves were important in determining the number of cells per filament during spring growth but cell breakage became more important during summer dormancy. Resting stages survived in cool, intermediate depths (50-150 m) during summer stratification and were returned to the surface during autumn overturn.

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Section: Discussionmentioning

confidence: 99%

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

Jewson

Granin

Zhdarnov

et al. 2010

European Journal of Phycology

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“…A combination of all these factors creates a complex and often puzzling and intriguing pattern of ice conditions. A better understanding of the various natural phenomena responsible for ice conditions should be made by combining the multidisciplinary efforts of the research community and insuring (1) the continuation of observations (both in situ and remote sensing); (2) the analysis of various palaeorecords, such as sediment core samples (Mackay et al , 2005 to reconstruct past environmental and natural conditions of Baikal; and, finally (3) the development and application of numerical modeling for reconstructing past ice lake conditions, analyzing current changes, and, potentially, predicting future ones.…”

Section: Discussionmentioning

confidence: 99%

The ice regime of Lake Baikal from historical and satellite data: Relationship to air temperature, dynamical, and other factors

Kouraev

Semovski

Shimaraev

et al. 2007

Limnology & Oceanography

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We give an overview of the history of the ice cover studies in Lake Baikal and a detailed description of the temporal and spatial variability of Lake Baikal ice conditions based on satellite and historical data. We analyze the long-term evolution of ice conditions using historical data and recent observations from satellite altimetry and radiometry for 1992-2004 for northern, middle, and southern Baikal. These data show a recent (since the 1990s) tendency for colder winters, with earlier ice formation, later ice break-up, and ice duration increase. These observations are in agreement with the long-period cycles of air temperature variability (warming between the 1970s and 1990s, with a cooling phase afterwards). We then compare air temperature data from meteorological stations to ERA-40 reanalysis and suggest that ERA-40 data can be used to assess seasonal and interannual changes of air temperature for Lake Baikal. The ERA-40 data also indicate a recent tendency for colder winters and for warmer summers. We further analyze how the ice regime is influenced by air temperature and how this influence is affected by dynamic (wind field, currents) and other (bathymetry, precipitation, etc.) factors. We estimate the relationship between air temperature parameters and the timing of ice events (ice formation and fast ice duration) and show that air temperature has the strongest effect on the ice regime. Dynamic and other factors interfere with the thermal influence, resulting in a change of ice formation dates and ice duration compared to the relationship that takes into account only the influence of air temperature.

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“…Siliceous algae (diatoms and crysophycean statospores) are one of the most often studied biotic proxies. Scientists agree and emphasize that, although many inference models have recently been developed for fine paleoenvironmental reconstructions (so-called transfer functions), only little attention has been paid to the quality of the primary data on which the reconstructions are based (Mackay et al 2005;Antoniades et al 2008;Ryves et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Diatom-based evidence for abrupt climate changes during the Late Glacial in the Southern Carpathian Mountains

Buczkó¹,

Magyari²,

Soróczki-Pintér³

et al. 2009

Central European Geology

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A high-resolution paleolimnological record from Lake Brazi (TDB-1; 45°23'47"N, 22°54'06"E, 1740 m a.s.l.), a small, glacial lake in the Retezat (South Carpathian Mountains, Romania) provides a sensitive record of the impacts of late glacial climatic change on siliceous algal assemblages. The sequence, ranging from 15,700 cal yr BP to 9500 cal yr BP, suggests that the most significant changes in diatom assemblages took place at 12,800 and 10,400 cal yr BP, when alkaliphilous fragilarioid taxa were replaced by acidophilous diatoms. Altogether eight zones were distinguished with sharp and rapid changes of diatom assemblages. The paper discusses the application of siliceous algae in multi-proxy paleolimnological analyses, demonstrates the advantages and disadvantages of this proxy and presents the story of floristic discovery of unique diatom assemblages, the closest recent analogs of which are found in the arctic region.

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1000 years of climate variability in central Asia: assessing the evidence using Lake Baikal (Russia) diatom assemblages and the application of a diatom-inferred model of snow cover on the lake

Cited by 61 publications

References 49 publications

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

The ice regime of Lake Baikal from historical and satellite data: Relationship to air temperature, dynamical, and other factors

Diatom-based evidence for abrupt climate changes during the Late Glacial in the Southern Carpathian Mountains

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