Vertical mixing in �berlingersee (Lake Constance) traced by SF6 and heat

1994 ◽  
Vol 56 (4) ◽  
pp. 329-347 ◽  
Author(s):  
Manfred Maiss ◽  
Johann Ilmberger ◽  
Karl Otto M�nnich
Keyword(s):  
Vertical Mixing ◽  
Lake Constance

Vertical mixing in Überlinger See, western part of Lake Constance

1990 ◽  
Vol 52 (3) ◽  
pp. 256-268 ◽  
Author(s):  
Gerhard Heinz ◽  
Johann Ilmberger ◽  
Michael Schimmele
Keyword(s):  
Vertical Mixing ◽  
Lake Constance

Flow Pattern Analysis of Constructed Wetlands Treating Landfill Leachate

1999 ◽  
Vol 40 (3) ◽  
pp. 309-315 ◽  
Author(s):  
Jonathan K. Rash ◽  
Sarah K. Liehr
Keyword(s):  
Constructed Wetlands ◽  
Vertical Mixing ◽  
Subsurface Flow ◽  
Free Water ◽  
Chemical Reactor ◽  
Operating Conditions ◽  
Conservative Tracer ◽  
Residence Time Distributions ◽  
Physical Barriers ◽  
Interior Points

Three series of tracer studies were performed on three constructed wetlands at the New Hanover County Landfill near Wilmington, North Carolina, USA. One vegetated free water surface wetland (FWS-R), one vegetated subsurface flow wetland (SSF-R), and one unvegetated control subsurface flow wetland (SSF-C) were studied. A conservative tracer, lithium chloride, was used to study the chemical reactor behavior of these wetlands under normal operating conditions. Results indicated that short-circuiting is quite common in SSF wetlands, while FWS wetlands are well-mixed and not as subject to short-circuiting. These results were obtained from and reinforced with tracer measurements at interior points in these wetlands, analysis of residence time distributions from two different formulations, and the construction of residence volume distributions. The short-circuiting in the SSF wetlands can be attributed to the following: (1) Vertical mixing is inhibited by a combination of physical barriers and density gradients caused by rainfall and runoff dilution of the upper layer; and (2) Leachate is drawn from the bottom of the wetland, causing it to further prefer a flow path along the bottom.

Between Metz and Überlingen

2018 ◽  
Author(s):  
Alexander O'Hara
Keyword(s):  
Lake Constance ◽  
The Political ◽  
Left Behind ◽  
Ultimate Failure ◽  
Set Up ◽  
Local Populace

After Columbanus was expelled from Luxeuil, he journeyed to Paris and Metz. Theudebert, ruler of Austrasia, proposed that Columbanus found a monastery on the eastern edges of his kingdom. Columbanus consented and led his monks to the Lake Constance area, where they engaged in a failed missionary attempt. They angered the local populace with their forceful proselytization and were soon driven out of the region. Columbanus resumed his initial plan to relocate to Italy, but one of his monks, Gallus, was left behind and later set up a small hermitage near the Steinach stream. Jonas of Bobbio described the entire episode in terms of mission, but Columbanus was not literally a missionary. His Alamannian activities are best understood when compared to his other attempts at monastic foundation. This chapter explores the political undertones of the Alamannian mission, the reasons for its ultimate failure, and the later achievements of Gallus.

Between the Devil and the Deep Lake Constance

2018 ◽  
Author(s):  
Alexander O'Hara
Keyword(s):  
Lake Constance ◽  
Deep Lake ◽  
The Devil

In his Vita Columbani Jonas of Bobbio provides the earliest instance of an interpretatio Christiana of the Alamannic god Woden, unequivocally identifying him with the devil. The significance of Jonas’s story about Columbanus and the pagan Alamanni does not lie in its preservation of any authentic details of Alamannic ritual, but rather in the fact that this is the oldest instance of interpretatio Christiana in the Germanic-speaking world.

scholarly journals Interannual to decadal variability of phosphate in the Oyashio region: Roles of wind-driven ocean current and tidally induced vertical mixing in the Sea of Okhotsk

2021 ◽  
pp. 102615
Author(s):  
Takuya Nakanowatari ◽  
Tomohiro Nakamura ◽  
Humio Mitsudera ◽  
Jun Nishioka ◽  
Hiroshi Kuroda ◽  
...  
Keyword(s):  
Sea Of Okhotsk ◽  
Decadal Variability ◽  
Vertical Mixing ◽  
Ocean Current ◽  
Oyashio Region ◽  
The Sea Of Okhotsk

scholarly journals Response of ocean phytoplankton community structure to climate change over the 21st century: partitioning the effects of nutrients, temperature and light

2010 ◽  
Vol 7 (12) ◽  
pp. 3941-3959 ◽  
Author(s):  
I. Marinov ◽  
S. C. Doney ◽  
I. D. Lima
Keyword(s):  
Climate Change ◽  
Community Structure ◽  
Sea Ice ◽  
Phytoplankton Biomass ◽  
Phytoplankton Community ◽  
Vertical Mixing ◽  
Phytoplankton Community Structure ◽  
Marginal Sea ◽  
Small Phytoplankton ◽  
The Impact

Abstract. The response of ocean phytoplankton community structure to climate change depends, among other factors, upon species competition for nutrients and light, as well as the increase in surface ocean temperature. We propose an analytical framework linking changes in nutrients, temperature and light with changes in phytoplankton growth rates, and we assess our theoretical considerations against model projections (1980–2100) from a global Earth System model. Our proposed "critical nutrient hypothesis" stipulates the existence of a critical nutrient threshold below (above) which a nutrient change will affect small phytoplankton biomass more (less) than diatom biomass, i.e. the phytoplankton with lower half-saturation coefficient K are influenced more strongly in low nutrient environments. This nutrient threshold broadly corresponds to 45° S and 45° N, poleward of which high vertical mixing and inefficient biology maintain higher surface nutrient concentrations and equatorward of which reduced vertical mixing and more efficient biology maintain lower surface nutrients. In the 45° S–45° N low nutrient region, decreases in limiting nutrients – associated with increased stratification under climate change – are predicted analytically to decrease more strongly the specific growth of small phytoplankton than the growth of diatoms. In high latitudes, the impact of nutrient decrease on phytoplankton biomass is more significant for diatoms than small phytoplankton, and contributes to diatom declines in the northern marginal sea ice and subpolar biomes. In the context of our model, climate driven increases in surface temperature and changes in light are predicted to have a stronger impact on small phytoplankton than on diatom biomass in all ocean domains. Our analytical predictions explain reasonably well the shifts in community structure under a modeled climate-warming scenario. Climate driven changes in nutrients, temperature and light have regionally varying and sometimes counterbalancing impacts on phytoplankton biomass and structure, with nutrients and temperature dominant in the 45° S–45° N band and light-temperature effects dominant in the marginal sea-ice and subpolar regions. As predicted, decreases in nutrients inside the 45° S–45° N "critical nutrient" band result in diatom biomass decreasing more than small phytoplankton biomass. Further stratification from global warming could result in geographical shifts in the "critical nutrient" threshold and additional changes in ecology.

Vertical mixing in Amazon floodplain lakes

1984 ◽  
Vol 22 (2) ◽  
pp. 1283-1287 ◽  
Author(s):  
Sally MacIntyre ◽  
John M. Melack
Keyword(s):  
Vertical Mixing ◽  
Floodplain Lakes ◽  
Amazon Floodplain

Role of tide-induced vertical mixing in the deep Pacific Ocean circulation

2021 ◽  
Vol 77 (2) ◽  
pp. 173-184
Author(s):  
Takao Kawasaki ◽  
H. Hasumi ◽  
Y. Tanaka
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
Vertical Mixing
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