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Evidence for two abrupt warming events of SST in the last century / C. A. Varotsos [et al.] // Theoretical and Applied Climatology. - 2013. - P1-10, DOI 10.1007/s00704-013-0935-8 . - ISSN 0177-798X
Аннотация: We have recently suggested that the warming in the sea surface temperature (SST) since 1900, did not occur smoothly and slowly, but with two rapid shifts in 1925/1926 and 1987/1988, which are more obvious over the tropics and the northern midlatitudes. Apart from these shifts, most of the remaining SST variability can be explained by the El Nino Southern Oscillation and the Pacific Decadal Oscillation (PDO). Here, we provide evidence that the timing of these two SST shifts (around 60В years) corresponds well to the quasi-periodicity of many natural cycles, like that of the PDO, the global and Northern Hemisphere annual mean temperature, the Atlantic Multi-decadal Oscillation, the Inter-Tropical Convergence Zone, the Southwest US Drought data, the length of day, the air surface temperature, the Atlantic meridional overturning circulation and the change in the location of the centre of mass of the solar system. In addition, we show that there exists a strong seasonal link between SST and ENSO over the tropics and the NH midlatitudes, which becomes stronger in autumn of the Northern Hemisphere. Finally, we found that before and after each SST shift, the intrinsic properties of the SST time series obey stochastic dynamics, which is unaffected by the modulation of these two shifts. In particular, the SST fluctuations for the time period between the two SST shifts exhibit 1/f-type long-range correlations, which are frequently encountered in a large variety of natural systems. Our results have potential implications for future climate shifts and crossing tipping points due to an interaction of intrinsic climate cycles and anthropogenic greenhouse gas emissions. В© 2013 Springer-Verlag Wien.

Scopus,
Scopus
Держатели документа:
Climate Research Group, Division of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, University Campus Bldg. Phys. V, Athens, 15784, Greece
British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom
Institute of Biophysics, SB RAS, Russian Academy of Sciences, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Varotsos, C.A.; Franzke, C.L.E.; Efstathiou, M.N.; Degermendzhi, A.G.

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Particulate fatty acids in two small Siberian reservoirs dominated by different groups of phytoplankton / N. N. Sushchik [et al.] // Freshwater Biology. - 2003. - Vol. 48, Is. 3. - P394-403, DOI 10.1046/j.1365-2427.2003.01009.x . - ISSN 0046-5070
Кл.слова (ненормированные):
Cyanobacteria -- Daphnids -- Diatoms -- Fatty acids -- alga -- cyanobacterium -- fatty acid -- periodicity -- phytoplankton -- reservoir -- seston -- algae -- Bacillariophyta -- Chlorophyta -- Cyanobacteria -- Daphnia -- Dinophyceae -- Euglenida -- Eukaryota
Аннотация: 1. We studied the composition of fatty acids (FAs) in the seston from two small freshwater reservoirs (Bugach and Lesnoi) with distinct periodicity of domination by cyanobacteria and eukaryotic algae during the growth season. 2. The diatoms in the both reservoirs were characterised by a high content of 14:0 and C16 unsaturated acids, whereas that of the essential FA 20:5?3 [eicosapentanoic acid (EPA)] was low. The correlation between this polyunsaturated FA (PUFA) and diatom biomass was not significant in either reservoir. The percentage of 20:5?3 in seston significantly correlated with the biomass of euglenophyta in Bugach and dinophyta in Lesnoi. Hence the diatoms, usually referred as a valuable food for zooplankton, were not an important source of the essential PUFA in these systems. 3. The dominant cyanobacteria in Bugach, and the green algae in Lesnoi, both contained the same marker acids: 18:3?3 and 18:2?6. Hence, a discrimination between these two phytoplanktonic groups on the basis of FA biomarkers may be difficult in some cases. 4. We found no significant correlation between the content of 20:5?3 in seston and the biomass of the dominant daphniids in either reservoir. This is contrary to expectations, based on the literature, that EPA is generally important. Rather, the biomass of the two dominant Daphnia species in Bugach correlated strongly with the content of 18:3?3 in the seston. The cyanobacteria were a probable source of this ?3 FA for Daphnia. We conclude that EPA is not always important for Daphnia populations although, in such cases, some other PUFA (e.g. 18:3?3) might be related to their growth.

Scopus
Держатели документа:
Inst. Biophys. Siberian Br. Russ. A., Akademgorodok, Krasnoyarsk, Russian Federation
Krasnoyarsk State University, Svobodny av., Krasnoyarsk, Russian Federation
Krasnoyarsk Stt. Agric. University, Mira av., Krasnoyarsk, Russian Federation
Inst. Biophys. Siberian Br. Russ. A., Akademgorodok, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Sushchik, N.N.; Gladyshev, M.I.; Kalachova, G.S.; Kravchuk, E.S.; Dubovskaya, O.P.; Ivanova, E.A.

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Coupled large earthquakes in the Baikal rift system: Response to bifurcations in nonlinear resonance hysteresis / A. V. Klyuchevskii, R. G. Khlebopros // Geoscience Frontiers. - 2013, DOI 10.1016/j.gsf.2013.01.008 . - ISSN 1674-9871
Кл.слова (ненормированные):
Baikal rift system -- Bifurcation -- Coupled large earthquakes -- Hysteresis -- Nonlinear geodynamics -- Nonlinear oscillator with dissipation -- Phase portrait
Аннотация: The current lithospheric geodynamics and tectonophysics in the Baikal rift are discussed in terms of a nonlinear oscillator with dissipation. The nonlinear oscillator model is applicable to the area because stress change shows up as quasi-periodic inharmonic oscillations at rifting attractor structures (RAS). The model is consistent with the space-time patterns of regional seismicity in which coupled large earthquakes, proximal in time but distant in space, may be a response to bifurcations in nonlinear resonance hysteresis in a system of three oscillators corresponding to the rifting attractors. The space-time distribution of coupled MLHВ >В 5.5 events has been stable for the period of instrumental seismicity, with the largest events occurring in pairs, one shortly after another, on two ends of the rift system and with couples of smaller events in the central part of the rift. The event couples appear as peaks of earthquake 'migration' rate with an approximately decadal periodicity. Thus the energy accumulated at RAS is released in coupled large events by the mechanism of nonlinear oscillators with dissipation. The new knowledge, with special focus on space-time rifting attractors and bifurcations in a system of nonlinear resonance hysteresis, may be of theoretical and practical value for earthquake prediction issues. Extrapolation of the results into the nearest future indicates the probability of such a bifurcation in the region, i.e., there is growing risk of a pending MВ ?В 7 coupled event to happen within a few years. В© 2013.

Scopus
Держатели документа:
Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, 128 ul. Lermontov, Irkutsk 664033, Russia
Siberian Federal University, 79, Svobodny ave., Krasnoyarsk 660041, Russia
Institute of Biophysics, Krasnoyarsk Science Center, Siberian Branch of the Russian Academy of Sciences, 50/50 Akademgorodok, Krasnoyarsk 660036, Russia : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Klyuchevskii, A.V.; Khlebopros, R.G.

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Coupled large earthquakes in the Baikal rift system: Response to bifurcations in nonlinear resonance hysteresis / A. V. Klyuchevskii, R. G. Khlebopros // Geoscience Frontiers. - 2013. - Vol. 4, Is. 6. - P709-716, DOI 10.1016/j.gsf.2013.01.008 . - ISSN 1674-9871
Кл.слова (ненормированные):
Baikal rift system -- Bifurcation -- Coupled large earthquakes -- Hysteresis -- Nonlinear geodynamics -- Nonlinear oscillator with dissipation -- Phase portrait
Аннотация: The current lithospheric geodynamics and tectonophysics in the Baikal rift are discussed in terms of a nonlinear oscillator with dissipation. The nonlinear oscillator model is applicable to the area because stress change shows up as quasi-periodic inharmonic oscillations at rifting attractor structures (RAS). The model is consistent with the space-time patterns of regional seismicity in which coupled large earthquakes, proximal in time but distant in space, may be a response to bifurcations in nonlinear resonance hysteresis in a system of three oscillators corresponding to the rifting attractors. The space-time distribution of coupled MLH > 5.5 events has been stable for the period of instrumental seismicity, with the largest events occurring in pairs, one shortly after another, on two ends of the rift system and with couples of smaller events in the central part of the rift. The event couples appear as peaks of earthquake 'migration' rate with an approximately decadal periodicity. Thus the energy accumulated at RAS is released in coupled large events by the mechanism of nonlinear oscillators with dissipation. The new knowledge, with special focus on space-time rifting attractors and bifurcations in a system of nonlinear resonance hysteresis, may be of theoretical and practical value for earthquake prediction issues. Extrapolation of the results into the nearest future indicates the probability of such a bifurcation in the region, i.e.; there is growing risk of a pending M ? 7 coupled event to happen within a few years.В© 2013, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

Scopus
Держатели документа:
Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, 128 ul. Lermontov, Irkutsk 664033, Russian Federation
Siberian Federal University, 79 Svobodny ave., Krasnoyarsk 660041, Russian Federation
Institute of Biophysics, Krasnoyarsk Science Center, Siberian Branch of the Russian Academy of Sciences, 50/50 Akademgorodok, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Klyuchevskii, A.V.; Khlebopros, R.G.

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Evidence for two abrupt warming events of SST in the last century [Text] / C. A. Varotsos [et al.] // Theor. Appl. Climatol. - 2014. - Vol. 116, Is. 1-2. - P51-60, DOI 10.1007/s00704-013-0935-8. - Cited References: 60 . - ISSN 0177-798X. - ISSN 1434-4483

РУБ Meteorology & Atmospheric Sciences
Рубрики:
SCALING BEHAVIOR
   OZONE DEPLETION
   PERMAFROST THAW
   CLIMATE SYSTEM
   AIR-POLLUTION
   LONG-MEMORY
   TEMPERATURE
   OSCILLATION
   VARIABILITY
   DYNAMICS
Аннотация: We have recently suggested that the warming in the sea surface temperature (SST) since 1900, did not occur smoothly and slowly, but with two rapid shifts in 1925/1926 and 1987/1988, which are more obvious over the tropics and the northern midlatitudes. Apart from these shifts, most of the remaining SST variability can be explained by the El Nio Southern Oscillation and the Pacific Decadal Oscillation (PDO). Here, we provide evidence that the timing of these two SST shifts (around 60 years) corresponds well to the quasi-periodicity of many natural cycles, like that of the PDO, the global and Northern Hemisphere annual mean temperature, the Atlantic Multi-decadal Oscillation, the Inter-Tropical Convergence Zone, the Southwest US Drought data, the length of day, the air surface temperature, the Atlantic meridional overturning circulation and the change in the location of the centre of mass of the solar system. In addition, we show that there exists a strong seasonal link between SST and ENSO over the tropics and the NH midlatitudes, which becomes stronger in autumn of the Northern Hemisphere. Finally, we found that before and after each SST shift, the intrinsic properties of the SST time series obey stochastic dynamics, which is unaffected by the modulation of these two shifts. In particular, the SST fluctuations for the time period between the two SST shifts exhibit 1/f-type long-range correlations, which are frequently encountered in a large variety of natural systems. Our results have potential implications for future climate shifts and crossing tipping points due to an interaction of intrinsic climate cycles and anthropogenic greenhouse gas emissions.

WOS,
Scopus
Держатели документа:
[Varotsos, Costas A.
Efstathiou, Maria N.] Univ Athens, Climate Res Grp, Div Environm Phys & Meteorol, Fac Phys, Athens 15784, Greece
[Franzke, Christian L. E.] British Antarctic Survey, Nat Environm Res Council, Cambridge CB3 0ET, England
[Degermendzhi, Andrei G.] Russian Acad Sci, Inst Biophys, SB RAS, Krasnoyarsk, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Varotsos, C.A.; Franzke, CLE; Efstathiou, M.N.; Degermendzhi, A.G.

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Particulate fatty acids in two small Siberian reservoirs dominated by different groups of phytoplankton [Text] / N. N. Sushchik [et al.] // Freshw. Biol. - 2003. - Vol. 48, Is. 3. - P. 394-403, DOI 10.1046/j.1365-2427.2003.01009.x. - Cited References: 44 . - ISSN 0046-5070

РУБ Marine & Freshwater Biology
Рубрики:
ENCLOSED EXPERIMENTAL ECOSYSTEM
   BLUE-GREEN-ALGAE
   DAPHNIA-GALEATA
   FOOD QUALITY
   MICROALGAE
   ZOOPLANKTON
   NUTRITION
   GROWTH
   LAKE
   REPRODUCTION
Кл.слова (ненормированные):
cyanobacteria -- daphnids -- diatoms -- fatty acids
Аннотация: 1. We studied the composition of fatty acids (FAs) in the seston from two small freshwater reservoirs (Bugach and Lesnoi) with distinct periodicity of domination by cyanobacteria and eukaryotic algae during the growth season. 2. The diatoms in the both reservoirs were characterised by a high content of 14:0 and C16 unsaturated acids, whereas that of the essential FA 20:5omega3 [eicosapentanoic acid (EPA)] was low. The correlation between this polyunsaturated FA (PUFA) and diatom biomass was not significant in either reservoir. The percentage of 20:5omega3 in seston significantly correlated with the biomass of euglenophyta in Bugach and dinophyta in Lesnoi. Hence the diatoms, usually referred as a valuable food for zooplankton, were not an important source of the essential PUFA in these systems. 3. The dominant cyanobacteria in Bugach, and the green algae in Lesnoi, both contained the same marker acids: 18:3omega3 and 18:2omega6. Hence, a discrimination between these two phytoplanktonic groups on the basis of FA biomarkers may be difficult in some cases. 4. We found no significant correlation between the content of 20:5omega3 in seston and the biomass of the dominant daphniids in either reservoir. This is contrary to expectations, based on the literature, that EPA is generally important. Rather, the biomass of the two dominant Daphnia species in Bugach correlated strongly with the content of 18:3omega3 in the seston. The cyanobacteria were a probable source of this omega3 FA for Daphnia . We conclude that EPA is not always important for Daphnia populations although, in such cases, some other PUFA (e.g. 18:3omega3) might be related to their growth.

WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Sushchik, N.N.; Gladyshev, M.I.; Kalachova, G.S.; Kravchuk, E.S.; Dubovskaya, O.P.; Ivanova, E.A.

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Dynamics of purple sulfur bacteria in a meromictic saline Lake Shunet (Khakassia, Siberia) in 2007–2013 / D. Y. Rogozin, V. V. Zykov, M. O. Tarnovskii // Microbiology. - 2016. - Vol. 85, Is. 1. - P93-101, DOI 10.1134/S0026261716010100 . - ISSN 0026-2617
Кл.слова (ненормированные):
long-term dynamics -- meromictic lake -- purple sulfur bacteria -- stratification
Аннотация: According to the results of seasonal monitoring, in 2007–2013 purple sulfur bacteria morphologically similar to Thiocapsa sp. Shira_1 (AJ633676 in EMBL/GenBank) predominated in the anoxygenic phototrophic community of the water column of the meromictic Lake Shira (Khakassia, Siberia). No pronounced seasonal periodicity in the total cell number in the water column was revealed during the period of observation. In some years cell number during the period when the lake was covered with ice was reliably higher than in summer. The absence of seasonal periodicity was probably due to the low amplitude of seasonal variations in temperature and illumination in the redox zone, resulting from its relatively deep location (12–16 m). The year-to-year dynamics was characterized by a reliable decrease of the total cell number in 2009–2010 and maxima in 2007 and 2011–2012. Canonical correlation analysis revealed that water temperature in the redox zone was the best predictor of the PSB abundance in Lake Shira. Water temperature, in turn, depended on the depth of mixing of the water column. Intense mixing in 2009–2011 was probably responsible for decreased PSB abundance in the lake. On the other hand, the absence of deep winter mixing, resulting in stable conditions in the chemocline, favored the preservation of relatively high PSB biomass. Prediction of circulation depth, which depends mainly on the weather conditions and dynamics of the water level, is required for prediction of PSB abundance in Lake Shira. These results may be useful for paleolimnological reconstructions of the history of the lake based on the remnants of purple sulfur bacteria in bottom sediments. © 2016, Pleiades Publishing, Ltd.

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Держатели документа:
Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Rogozin, D. Y.; Zykov, V. V.; Tarnovskii, M. O.

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Luminescence of wood samples during long-term storage / A. P. Puzyr, S. E. Medvedeva // Mycosphere. - 2016. - Vol. 7, Is. 6. - P716-727, DOI 10.5943/mycosphere/7/6/2 . - ISSN 2077-7000
Кл.слова (ненормированные):
Light emitting wood -- Luminous mycelia
Аннотация: The present study describes changes in the mycelium of the fungus growing on the luminescent wood collected on Borneo Island in early December 2013 that occurred during 31 months of storage. The study shows that wood samples retain their ability to emit light, forming two types of luminescent mycelium: surface mycelium and aerial mycelium. The hyphae of the surface mycelium form on the surface of the wood sample and then spread over the surface of the polyethylene bag or over the surface of the bottom of tissue culture flasks containing the samples. The aerial mycelium develops later and only in tissue culture flasks, forming biomass composed of local interlaced hyphae, growing upward. The surface mycelium is characterized by non-uniform "flickering" luminescence along the hyphae. There is no diurnal periodicity in the luminescence of this fungus, but luminescence is increased by mechanical disturbance or exposure to ultraviolet radiation. The local impact of these factors causes an increase in luminescence of the mycelium regions that have not been directly affected. It has been assumed that the variable level of luminescence is an individual trait of this fungus species. The results obtained in this study suggest that luminescent wood found on Borneo Island contains mycelium of a fungus species, whose luminescent properties are essentially different from those of the fungi described in the scientific literature.

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Держатели документа:
Institute of Biophysics, Siberian Branch of Russian Academy of Science, Federal Research Center 'Krasnoyarsk Science Center SB RAS', Akademgorodok, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Puzyr, A. P.; Medvedeva, S. E.

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