Hydrodynamics as a limiting factor in the Lake Baikal ecosystem

Verkhozina, V. A.; Kozhova, O. M.; Kusner, Yu. S.

doi:10.1016/s1463-4988(00)00019-1

Cited by 13 publications

(7 citation statements)

References 10 publications

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“…A direct link between BioSi flux to the bottom and orbital forcing is suggested based on the hypothesis of hydrodynamic limitation of diatom production in Lake Baikal. This hypothesis relates massive diatom blooms, which occur in Lake Baikal in spring under the ice, with high turbulence of the upper layer of water (Verkhozina et al, 1997). The phenomenon of Lake Baikal's spring bloom can be explained as follows.…”

Section: The Mechanism Of Climatic Response Of Lake Baikalmentioning

confidence: 99%

“…In early spring (March-April) a shallow thermocline (20-50 m water depth) lies within the photic zone, which reaches 60-70 m in Lake Baikal (Votintzev, 1990). Incoming solar radiation, by heating water under the ice, induces strong temperature (density) convection causing high turbulence, which keeps diatoms suspended in the trophogenic layer (Verkhozina et al, 1997). This mechanism allows spring production to reach mesotrophic and even eutrophic values (Popovskaya, 1987).…”

Section: The Mechanism Of Climatic Response Of Lake Baikalmentioning

confidence: 99%

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Biogenic Silica Record of the Lake Baikal Response to Climatic Forcing during the Brunhes

et al. 2001

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This work presents a detailed, orbitally tuned biogenic silica record of continental paleoclimate change during the Brunhes chron. The Brunhes/Matuyama boundary lies within the warm isotopic stage 19 in Baikal, and the boundaries between eight lithological cycles correspond to terminations in the marine oxygen isotope record. The high amplitude and resolution of climatically driven changes in BioSi content in Lake Baikal sediments permits tuning of almost every precessional cycle during the Brunhes and reveals the structure of interglacial stages. For example, the last three interglacial stages (MIS 5, 7, and 9) clearly consist of five substages (a, b, c, d, e) corresponding to precessional insolation peaks. Abrupt and intense regional glaciations in Siberia during substages 5d and 7d were driven by extreme insolation minima. During substage 9d cooling was more gradual in response to more moderate forcing. The impact of strong glaciation is also observed in the middle of stage 15, where full glacial conditions appear to have lasted for over 30,000 yr during substages 15d, 15c, and 15b. Marine oxygen isotopic stage 11 appears to be the warmest period during the Brunhes in the Lake Baikal record, with at least three substages.A new hypothesis is presented regarding the response of the Lake Baikal BioSi record to insolation forcing. Based on the mechanism controlling modern diatom blooms, biogenic silica production is hypothesized to be dependent on changes in the heat balance of the lake and consequently on changes in the thermal structure of the water column. This mechanism is also sensitive to short-term sub-Milankovich cooling events, such as the mid-Eemian cooling, the Montaigu event during substage 5c, and a cooling which appears to be analogous to the Montaigu event during substage 9c. The continuity of the Lake Baikal paleoclimate record, its sensitivity to orbital forcing, and its high resolution make it an excellent candidate for a new “paleoclimatic stratotype” section for continental Asia.

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Section: The Mechanism Of Climatic Response Of Lake Baikalmentioning

confidence: 99%

Section: The Mechanism Of Climatic Response Of Lake Baikalmentioning

confidence: 99%

Biogenic Silica Record of the Lake Baikal Response to Climatic Forcing during the Brunhes

et al. 2001

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“…Thus, by inspection of diatom assemblages in sedimentary records, we can make direct and indirect inferences about past climate (Mackay et al, 2003b). Recent studies have demonstrated that the diatom phytoplankton of Lake Baikal is largely affected by physical variables of the lake, especially ice and snow cover, seasonal overturn, and other mixing properties (e.g., see Granin et al, 1999;Verkhozina et al, 2000;Mackay et al, 2003a). For example, increased snow depths on the ice in spring will act to reduce light penetration, which in turn will result in less energy to support a dynamic phytoplankton community to survive under the ice .…”

Section: Introductionmentioning

confidence: 99%

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

Ryves

Battarbee

et al. 2005

Global and Planetary Change

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“…There were a number of failures in explaining 'melosira years' (Votintsev, 1961;Shimaraev, 1971;Verkhozina et al, 2000) because, in our view, they tried to correlate this phenomenon with hydrophysical parameters of the environment, namely thickness of the ice-cover, depth of ice-covering snow, temperature of autumn waters, turbulent mixing through the water column, etc. Only Ivakhnenko et al (1985) before us elevated their eyes from earth to sky: they converted the five parameters of the Lake Baikal ecosystem into a Fourier series by an average value of solar activity cycles, equal to 11.2 years.…”

Section: Introductionmentioning

confidence: 99%

Eleven- and ten-year basic cycles of Lake Baikal spring phytoplankton conformed to solar activity cycles

Бондаренко

Evstafyev

2006

Hydrobiologia

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The paper presents an analysis and discussion on a phenomenon of Lake Baikal spring phytoplankton known as 'melosira years,' or high-productive years, which are years when spring a psychric set of planktonic algae intensively blooms in the interstitial water within the thawing ice and in the under-ice water. Alternative of these high-and low-productive years is one of greatest baikalian mysteries long attracting researchers' attention. Analysis of a sequence of high-productive years from 1943 to present, allowed us to reveal 11-and 10-year cycles in long-term dynamics of the Lake Baikal spring phytoplankton. Within these basic cycles we have found enclosed three intervals between high-productive years. Moreover, these intervals being usually 3 and 4 years long became doubled, i.e., 6 and 8 years long, from 1968 to 1990 that equals 22 years in length, or two 11-year fragments. This phenomenon of doubling can be explained in terms of the resonance theory so we consider the 'melosira years' phenomenon to be bound up with solar activity, resonantly influencing baikalian phytoplankton. Also we found that Lake Baikal spring phytoplankton skip between their 11-and 10-year cycles in conforming to a current solar activity length.

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Hydrodynamics as a limiting factor in the Lake Baikal ecosystem

Cited by 13 publications

References 10 publications

Biogenic Silica Record of the Lake Baikal Response to Climatic Forcing during the Brunhes

Biogenic Silica Record of the Lake Baikal Response to Climatic Forcing during the Brunhes

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

Eleven- and ten-year basic cycles of Lake Baikal spring phytoplankton conformed to solar activity cycles

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