Basin-scale internal waves in the bottom boundary layer of ice-covered Lake Müggelsee, Germany

Kirillin, Georgiy; Engelhardt, Christof; Golosov, Sergey; Hintze, Thomas

doi:10.1007/s10452-009-9274-3

Cited by 29 publications

(27 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…So far we do not know any specific cause for this phenomenon, but it is obvious that near the water-bottom boundary oscillating water motions occur during winter, which can cause mixing and heat and mass transfer from the sediment. The temperature oscillations in the upper several centimeters of the sediment in Lake Müggel-see, Germany, during the winter of 2005/2006 produced vertical density instability and pore-water convection in the upper sediments were associated with a basin-scale internal waves (Kirillin et al 2009). Two frequency peaks in the oscillations corresponded to two rotational waves, one of Kelvin-wave type and another of Poincaré type wave (Kirillin et al 2009).…”

Section: Discussionmentioning

confidence: 98%

Spatial and temporal variations of the water–sediment thermal structure in shallow ice-covered Lake Vendyurskoe (Northwestern Russia)

Здоровеннова

2009

Aquat Ecol

View full text Add to dashboard Cite

The thermal structures in the vicinity of the ice-water and water-sediment boundaries of a shallow lake, L. Vendyurskoe (Northwestern Russia) during four winter seasons are described. The heat flux at the water-ice boundary was 0.1-0.2 W m -2 during winter. The maximal heat flux at the watersediment boundary was 4.5 W m -2 at the beginning and 0.5 W m -2 at the end of winter. The daily average value of the solar radiation penetrating into the water was 0.5 W m -2 during main part of winter and 2-50 W m -2 during April. During winter, temperature showed an oscillation in the vicinity of the sediment-water interface. Most periods corresponding to the main oscillation frequencies in the near-bottom water layer (0-0.4 m) and upper layer sediment (0-0.35 m), identified by FFT analysis, fall within the scale of synoptic variations (3-10 days), and in a number of cases were equal to 1 day. The theoretical periods of the first baroclinic seiche mode of Lake Vendyurskoe are 4.5-8.5 days that compares well with identified temperature oscillation periods. The comparison between the rate of heat content change in a water column and the difference of vertical heat fluxes from sediment to water and from water to ice show that the horizontal heat transport takes place in the lake during winter as a result of heat advection along the bottom.

show abstract

Section: Discussionmentioning

confidence: 98%

Spatial and temporal variations of the water–sediment thermal structure in shallow ice-covered Lake Vendyurskoe (Northwestern Russia)

Здоровеннова

2009

Aquat Ecol

View full text Add to dashboard Cite

show abstract

“…The strength of the wave-shape deflection from that of the planar seiche, due to rotation, depends on the Burger number (Kirillin et al 2009). In Lake Arendsee, the observed values of the Burger number for seiches of the first vertical mode did not strongly deviate from one (Table 2).…”

Section: Discussionmentioning

confidence: 99%

Seasonal pattern of rotation‐affected internal seiches in a small temperate lake

Bernhardt

Kirillin

2013

Limnology & Oceanography

Self Cite

View full text Add to dashboard Cite

The aim was to disclose the seasonality in the internal seiches during summer stratification in 2010 within the small, 3 km long, ellipse-shaped, temperate Lake Arendsee (Germany) with simple morphometry. We used observations of temperatures from two thermistor chains (09 April to 24 September), conductivity and temperature profiles, and wind speeds and directions (January to December). To analyze the seasonality in the periods, appearance and modal structure of the seiches, and the wind forcing, we applied spectral analysis on monthly time series of isotherms and wind speeds, and wavelet analysis on 6 month long time series of integrated potential energy and wind speeds. To determine the effect of earth's rotation on seiches, we applied two analytical models based on three-layer density stratification. Earth's rotation affected internal seiches significantly even in a small lake. That was shown by the models and the Burger number being , 1 during stratification. Vertical mode 1 Kelvin-type seiches dominated the internal seiche weather in Lake Arendsee, with their periods changing because of seasonal variations in stratification. Weak, free seiches of vertical mode 2 were amplified during three episodes: (1) in midsummer, when their periods coincided with the inertial period at the lake's latitude, (2) in late spring, and (3) in autumn, both when their periods approached 24 h. The amplifications were caused by resonance between free seiches and wind-forced oscillations at diurnal and inertial periods. Such short-term resonance events, associated with enhanced mixing, are inherent for the seasonal stratification cycle in the most temperate lakes.

show abstract

“…Among them are the groundwater and subsurface inflows (Bengtsson 1996), standing waves (seiches) produced by oscillations of the ice sheet (Petrov et al 2007;Kirillin et al 2009), and fluxes of dissolved salts. Ice formation causes an increase in the salt concentration in the upper water column (cryo-concentration), whereas melting has the opposite ''freshening'' effect.…”

Section: Physical Structure Of Ice-covered Lakesmentioning

confidence: 99%

“…1b) dominates during the entire ice-covered period (Farmer 1975;Shimaraev and Granin 1991). Lakes in milder climates, with only intermittent ice cover, do not possess a well-defined ice season (Bernhardt et al 2012), and their under-ice circulation is typically governed by both sediment heat and solar radiation, superimposed on residual effects of wind-driven circulation (Kirillin et al 2009). …”

Section: Physical Structure Of Ice-covered Lakesmentioning

confidence: 99%

The under‐ice microbiome of seasonally frozen lakes

Bertilsson

Burgin

Carey

et al. 2013

Limnology & Oceanography

Self Cite

170

207

View full text Add to dashboard Cite

Compared to the well-studied open water of the ''growing'' season, under-ice conditions in lakes are characterized by low and rather constant temperature, slow water movements, limited light availability, and reduced exchange with the surrounding landscape. These conditions interact with ice-cover duration to shape microbial processes in temperate lakes and ultimately influence the phenology of community and ecosystem processes. We review the current knowledge on microorganisms in seasonally frozen lakes. Specifically, we highlight how under-ice conditions alter lake physics and the ways that this can affect the distribution and metabolism of auto-and heterotrophic microorganisms. We identify functional traits that we hypothesize are important for understanding under-ice dynamics and discuss how these traits influence species interactions. As ice coverage duration has already been seen to reduce as air temperatures have warmed, the dynamics of the underice microbiome are important for understanding and predicting the dynamics and functioning of seasonally frozen lakes in the near future.The quality of freshwater, which is tightly tied to many essential ecosystem services, is influenced in large part by the activities of microbial communities. In inland waters, as in other ecosystems, microorganisms are at the hub of most biogeochemical processes and largely control ecosystem functioning via their metabolic activities. However, attempts to describe the taxonomy and ecology of the freshwater microbiome mainly involve samples collected during the icefree season and, hence, largely neglect microbial communities and their activities during the ice-covered period. Knowledge about the year-round ecological and biogeochemical traits of typical freshwater microorganisms is required to understand when and where certain microorganisms will appear and how they will influence other organisms or biogeochemical processes and, hence, water quality. Together, this information will improve our ability to predict and model freshwater ecosystem and biogeochemical dynamics and to determine their role in the landscapes in the face of environmental change.A large number of lakes, particularly those situated at high altitude and the numerous high-latitude lakes in the temperate and boreal climate zones, are seasonally covered by ice for more than 40% of the year (Walsh et al. 1998). Despite this, surprisingly little is known about the ecology, diversity, and metabolism of microorganisms that reside under the ice cover in such lakes (Salonen et al. 2009). The traditional view is that ecosystems subjected to low temperatures are ''on hold'' and that cellular adaptations for survival at low temperatures control the composition of the winter microbial community, which awaits environmental conditions more conducive for growth. This traditional concept fails to recognize that the winter season affects the ecology and metabolic features of freshwater microorganisms, as well as their involvement in food webs and global biogeochemical c...

show abstract

Basin-scale internal waves in the bottom boundary layer of ice-covered Lake Müggelsee, Germany

Cited by 29 publications

References 14 publications

Spatial and temporal variations of the water–sediment thermal structure in shallow ice-covered Lake Vendyurskoe (Northwestern Russia)

Spatial and temporal variations of the water–sediment thermal structure in shallow ice-covered Lake Vendyurskoe (Northwestern Russia)

Seasonal pattern of rotation‐affected internal seiches in a small temperate lake

The under‐ice microbiome of seasonally frozen lakes

Contact Info

Product

Resources

About