A long-term record of ice cover for Mirror Lake, New Hampshire: effects of global warming?

Electrical-resistivity surveys, seepage meter measurements, and drive-point piezometers have been used to characterize chloride-enriched groundwater in lakebed sediments of Mirror Lake, New Hampshire, U.S.A. A combination of bottom-cable and floating-cable electrical-resistivity surveys identified a conductive zone [Formula: see text] overlying resistive bedrock [Formula: see text] beneath the lake. Shallow pore-water samples from piezometers in lakebed sediments have chloride concentrations of [Formula: see text], and lake water has a chloride concentration of [Formula: see text]. The extent of the plume was estimated and mapped using resistivity and water-sample data. The plume ([Formula: see text] wide and at least [Formula: see text] thick) extends nearly the full length and width of a small inlet, overlying the top of a basin formed by the bedrock. It would not have been possible to mapthe plume’s shape without the resistivity surveys because wells provided only limited coverage. Seepage meters were installed approximately [Formula: see text] from the mouth of a small stream discharging at the head of the inlet in an area where the resistivity data indicated lake sediments are thin. These meters recorded in-seepage of chloride-enriched groundwater at rates similar to those observed closer to shore, which was unexpected because seepage usually declines away from shore. Although the concentration of road salt in the northeast inlet stream is declining, the plume map and seepage data indicate the groundwater contribution of road salt to the lake is not declining. The findings demonstrate the benefit of combining geophysical and hydrologic data to characterize discharge of a plume beneath Mirror Lake. The extent of the plume in groundwater beneath the lake and stream indicate there will likely be a long-term source of chloride to the lake from groundwater.

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Climatic data for Mirror Lake, West Thornton, New Hampshire: 1985

Open-File Report ◽

10.3133/ofr87682 ◽

1988 ◽

Author(s):

Alex M. Sturrock ◽

D.C. Buso ◽

J.L. Scarborough ◽

T.C. Winter

Keyword(s):

New Hampshire ◽

Climatic Data ◽

Mirror Lake

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Long-Term Increase in Hibernating Bats in Swedish Mines — Effect of Global Warming?

Acta Chiropterologica ◽

10.3161/15081109acc2018.20.2.012 ◽

2019 ◽

Vol 20 (2) ◽

pp. 421 ◽

Cited By ~ 1

Author(s):

Jens Rydell ◽

Johan Eklöf ◽

Hans Fransson ◽

Sabine Lind

Keyword(s):

Global Warming

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Influence of the Environment on the Reliability of Security Magnetic Contacts

Micromachines ◽

10.3390/mi12040401 ◽

2021 ◽

Vol 12 (4) ◽

pp. 401

Author(s):

Martin Boros ◽

Andrej Velas ◽

Viktor Soltes ◽

Jacek Dworzecki

Keyword(s):

Global Warming ◽

Extreme Conditions ◽

Alarm System ◽

Test Device ◽

Reaction Distance ◽

Ambient Temperatures ◽

Thermal Chamber

Magnetic contacts are one of the basic components of an alarm system, providing access to buildings, especially windows and doors. From long-term reliability tests, it can be concluded that magnetic contacts show sufficient reliability. Due to global warming, we can measure high as well as low ambient temperatures in the vicinity of magnetic contacts, which can directly affect their reliability. As part of partial tests, research into the reliability of magnetic contacts, we created a test device with which their reaction distance was examined under extreme conditions simulated in a thermal chamber. The results of the practical tests have yielded surprising results.

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Biological sediment mixing and its stratigraphic implication in Mirror Lake (New Hampshire, U. S. A.)

SIL Proceedings 1922-2010 ◽

10.1080/03680770.1983.11897345 ◽

1984 ◽

Vol 22 (1) ◽

pp. 567-572 ◽

Cited By ~ 1

Author(s):

Robert E. Moeller ◽

Frank Oldfield ◽

Peter G. Appleby

Keyword(s):

New Hampshire ◽

Mirror Lake ◽

Sediment Mixing

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Seasonal changes in biomass, tissue chemistry, and net production of the evergreen hydrophyte, Lobelia dortmanna

Canadian Journal of Botany ◽

10.1139/b78-165 ◽

1978 ◽

Vol 56 (12) ◽

pp. 1425-1433 ◽

Cited By ~ 59

Author(s):

Robert E. Moeller

Keyword(s):

New Hampshire ◽

Seasonal Changes ◽

P Uptake ◽

Depth Limit ◽

Net Production ◽

Mirror Lake ◽

Growth Requirements ◽

Leaf Turnover ◽

Nutrient Conservation ◽

Tissue Chemistry

The evergreen characteristic of Lobelia dortmanna L. involves biomass and nutrient conservation. Although 60% of the maximum, midsummer biomass overwinters, little or no new tissue is produced between October and early May. Annual net production, estimated from the rate of leaf turnover, is less than the maximum biomass (P/B = 0.69 per year). Nitrogen and P concentrations are lowest in mid-August, when the amount of each analyzed element per square metre is near its maximum (N, P, Ca, Mg, Na, K). Autumnal uptake of N may contribute 25% of the next season's growth requirements, but P uptake is largely offset by losses during the winter. Fruiting and sterile plants have similar contents of N, P, and K in late July, but the fruiting plants are richer in Ca, Mg, Na, Fe, Mn, and Zn. At the maximum depth limit of the population in Mirror Lake, New Hampshire (2.3 m), flowering is absent and seedlings are sparse, suggesting reproductive failure as a controlling factor at the margin of the population.

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Terms and conditions of high-mountain lake ice-cover chemistry (Carpathians, Poland)

Journal of Glaciology ◽

10.3189/2015jog15j045 ◽

2015 ◽

Vol 61 (230) ◽

pp. 1207-1212 ◽

Cited By ~ 1

Author(s):

Iwona Kurzyca ◽

Adam Choiński ◽

Joanna Pociask-Karteczka ◽

Agnieszka Lawniczak ◽

Marcin Frankowski

Keyword(s):

Water Body ◽

Ice Cover ◽

Multilayered Structure ◽

Mountain Lake ◽

High Mountain ◽

Lake Ice ◽

High Mountain Lake ◽

Spatial Diversification ◽

The Tatra Mountains

AbstractWe discuss the results of an investigation of the chemical composition of the ice cover on the high-mountain lake Morskie Oko in the Tatra Mountains, Carpathians, Poland. In the years 2007–13, the ice cover was characterized by an average duration of 6 months, a thickness range of 0.40–1.14 m, and a multilayered structure with water or slush inclusion. In water from the melted ice cover, chloride (max. 69%) and sulphate (max. 51%) anions and ammonium (max. 66%) and calcium (max. 78%) cations predominated. Different concentrations of ions (F−, Cl−, NO3−, SO42−, Na+, K+, Mg2+, Ca2+, NH4+) in the upper, middle and bottom layers of ice were observed, along with long-term variability and spatial diversification within the ice layer over the lake. Snowpack lying on the ice and the water body under the ice were also investigated, and the influence on the ice cover of certain ions in elevated concentrations was observed (e.g. Cl− in the upper ice cover and the snowpack, and Ca2+ in the bottom ice cover and water body).

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The Southern Ocean benthic fauna and climate change: a historical perspective

Philosophical Transactions of the Royal Society B Biological Sciences ◽

10.1098/rstb.1992.0150 ◽

1992 ◽

Vol 338 (1285) ◽

pp. 299-309 ◽

Cited By ~ 143

Keyword(s):

Global Warming ◽

Southern Ocean ◽

Environmental Change ◽

Benthic Communities ◽

Benthic Fauna ◽

Marine Fauna ◽

Short Term Change ◽

Term Change ◽

Continental Ice Sheets

Environmental change is the norm and it is likely that, particularly on the geological timescale, the temperature regime experienced by marine organisms has never been stable. These temperature changes vary in timescale from daily, through seasonal variations, to long-term environmental change over tens of millions of years. Whereas physiological work can give information on how individual organisms may react phenotypically to short-term change, the way benthic communities react to long-term change can only be studied from the fossil record. The present benthic marine fauna of the Southern Ocean is rich and diverse, consisting of a mixture of taxa with differing evolutionary histories and biogeographical affinities, suggesting that at no time in the Cenozoic did continental ice sheets extend sufficiently to eradicate all shallow-water faunas around Antarctica at the same time. Nevertheless, certain features do suggest the operation of vicariant processes, and climatic cycles affecting distributional ranges and ice-sheet extension may both have enhanced speciation processes. The overall cooling of southern high-latitude seas since the mid-Eocene has been neither smooth nor steady. Intermittent periods of global warming and the influence of Milankovitch cyclicity is likely to have led to regular pulses of migration in and out of Antarctica. The resultant diversity pump may explain in part the high species richness of some marine taxa in the Southern Ocean. It is difficult to suggest how the existing fauna will react to present global warming. Although it is certain the fauna will change, as all faunas have done throughout evolutionary time, we cannot predict with confidence how it will do so.

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