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  • 1
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    Variability of instream and riparian storage and flow in a beaded arctic stream (2011)
    Wiley
    Details
    Publication Date: 2011-10-14
    Description: The extent and variability of water storage and residence times throughout the open water season in beaded arctic streams are poorly understood. Data collected in Imnavait Creek, a beaded stream located north of the Brooks Range in Alaska, were used to better understand the effects of in-pool and riparian storage on heat and mass movement through beaded streams. Temperature data of high spatial resolution within the pools and surrounding sediments were used with volumetric discharge and electrical conductivity to identify storage areas within the pools, banks, and other marshy areas within the riparian zone, including subsurface flow paths that connect the pools. These subsurface flows were found to alter water conductivity and the character of dissolved organic matter (DOM) in short reaches (10s of m) while influencing the chemistry of downstream pools. During low flow periods persistent stratification occurred within the pools due to absorption by dissolved organic matter of solar radiation inputs coupled with permafrost below and low wind stress at the pool surface. Additionally, one of the shallow pools (〈0.5 m depth) remained stratified during higher flow periods and lower radiation inputs due to dense subsurface flows entering the bottom of the pools. This consistent separation of surface and bottom water masses in each pool will increase the travel times through this and similar arctic watersheds, and therefore will affect the evolution of water chemistry and material export. Copyright © 2011 John Wiley & Sons, Ltd.
    Print ISSN: 0885-6087
    Electronic ISSN: 1099-1085
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley
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  • 2
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    Arctic lakes and streams as gas conduits to the atmosphere: implications for tundra carbon budgets (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-01-18
    Description: Arctic tundra has large amounts of stored carbon and is thought to be a sink for atmospheric carbon dioxide (CO(2)) (0.1 to 0.3 petagram of carbon per year) (1 petagram = 10(15) grams). But this estimate of carbon balance is only for terrestrial ecosystems. Measurements of the partial pressure of CO(2) in 29 aquatic ecosystems across arctic Alaska showed that in most cases (27 of 29) CO(2) was released to the atmosphere. This CO(2) probably originates in terrestrial environments; erosion of particulate carbon plus ground-water transport of dissolved carbon from tundra contribute to the CO(2) flux from surface waters to the atmosphere. If this mechanism is typical of that of other tundra areas, then current estimates of the arctic terrestrial sink for atmospheric CO(2) may be 20 percent too high.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kling, G W -- Kipphut, G W -- Miller, M C -- New York, N.Y. -- Science. 1991 Jan 18;251(4991):298-301.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17733287" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Carbon cycle. Sunlight controls water column processing of carbon in arctic fresh waters (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-08-26
    Description: Carbon in thawing permafrost soils may have global impacts on climate change; however, the factors that control its processing and fate are poorly understood. The dominant fate of dissolved organic carbon (DOC) released from soils to inland waters is either complete oxidation to CO2 or partial oxidation and river export to oceans. Although both processes are most often attributed to bacterial respiration, we found that photochemical oxidation exceeds rates of respiration and accounts for 70 to 95% of total DOC processed in the water column of arctic lakes and rivers. At the basin scale, photochemical processing of DOC is about one-third of the total CO2 released from surface waters and is thus an important component of the arctic carbon budget.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cory, Rose M -- Ward, Collin P -- Crump, Byron C -- Kling, George W -- New York, N.Y. -- Science. 2014 Aug 22;345(6199):925-8. doi: 10.1126/science.1253119.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA. rmcory@umich.edu. ; Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA. ; Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA. ; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25146289" target="_blank"〉PubMed〈/a〉
    Keywords: Arctic Regions ; Carbon/*chemistry ; *Carbon Cycle ; Carbon Dioxide/chemistry ; Fresh Water/*chemistry ; Geologic Sediments/chemistry ; Photochemical Processes ; Soil ; *Sunlight ; Wetlands
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Carbon dioxide supersaturation in the surface waters of lakes (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-09-09
    Description: Data on the partial pressure of carbon dioxide (CO(2)) in the surface waters from a large number of lakes (1835) with a worldwide distribution show that only a small proportion of the 4665 samples analyzed (less than 10 percent) were within +/-20 percent of equilibrium with the atmosphere and that most samples (87 percent) were supersaturated. The mean partial pressure of CO(2) averaged 1036 microatmospheres, about three times the value in the overlying atmosphere, indicating that lakes are sources rather than sinks of atmospheric CO(2). On a global scale, the potential efflux of CO(2) from lakes (about 0.14 x 10(15) grams of carbon per year) is about half as large as riverine transport of organic plus inorganic carbon to the ocean. Lakes are a small but potentially important conduit for carbon from terrestrial sources to the atmospheric sink.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cole, J J -- Caraco, N F -- Kling, G W -- Kratz, T K -- New York, N.Y. -- Science. 1994 Sep 9;265(5178):1568-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17801536" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    The 1986 lake nyos gas disaster in cameroon, west Africa (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-04-10
    Description: The sudden, catastrophic release of gas from Lake Nyos on 21 August 1986 caused the deaths of at least 1700 people in the northwest area of Cameroon, West Africa. Chemical, isotopic, geologic, and medical evidence support the hypotheses that (i) the bulk of gas released was carbon dioxide that had been stored in the lake's hypolimnion, (ii) the victims exposed to the gas cloud died of carbon dioxide asphyxiation, (iii) the carbon dioxide was derived from magmatic sources, and (iv) there was no significant, direct volcanic activity involved. The limnological nature of the gas release suggests that hazardous lakes may be identified and monitored and that the danger of future incidents can be reduced.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kling, G W -- Clark, M A -- Wagner, G N -- Compton, H R -- Humphrey, A M -- Devine, J D -- Evans, W C -- Lockwood, J P -- Tuttle, M L -- Koenigsberg, E J -- New York, N.Y. -- Science. 1987 Apr 10;236(4798):169-75.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17789781" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Seasonal mixing and catastrophic degassing in tropical lakes, cameroon, west Africa (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-08-28
    Description: Lethal gas releases from Lakes Nyos and Monoun in Cameroon seem to be more lacustrine than volcanic in origin. Both of these events occurred in August and were only 2 years apart. Data show that the period of deepest mixing and lake turnover also occurs during late summer in this region of tropical Africa. In addition, recent trends of decreases in both air temperatures and effective insolation relative to long-term means suggest that weakening of stratification, coupled with a predictable seasonal interval of reduced stability in August, may be responsible for the timing of these events.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kling, G W -- New York, N.Y. -- Science. 1987 Aug 28;237(4818):1022-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17837396" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
    Electronic Resource
    Electronic Resource
    Conclusions from Lake Nyos disaster (1990)
    [s.l.] : Nature Publishing Group
    Nature 348 (1990), S. 201-201 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-In August 1986, the Lake Nyos disaster brought death and devastation to a densely populated part of the Northwest Province of Cameroon12. The death toll, which was officially estimated at more than 1,700, was far in excess of that for any previous similar disaster. In the immediate aftermath ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/348201a0
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  • 8
    Electronic Resource
    Electronic Resource
    The genusDaphnia in Cameroon, West Africa (1988)
    Springer
    Hydrobiologia 160 (1988), S. 257-261 
    Details
    ISSN: 1573-5117
    Keywords: Cameroon ; Daphnia ; biogeography ; montane lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three species of the genusDaphnia are recorded from Cameroon.Daphnia obtusa was found in a single lake out of 37 sampled.Daphnia laevis was found in the same lake asD. obtusa and in two other lakes, whileD. rosea was found in three other lakes. All the lakes were at altitudes over 1 000 m. The records can be interpreted either as altitudinal survivals of continually dispersing species, or as relicts in an area whereDaphnia is usually very rare or absent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007140
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  • 9
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    From The Cover: Degassing Lakes Nyos and Monoun: Defusing certain disaster (2005)
    National Academy of Sciences
    Details
    Publication Date: 2005-09-26
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Sunlight amplifies CO2 release from arctic soil C [Ecology] (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-02-27
    Description: Recent climate change has increased arctic soil temperatures and thawed large areas of permafrost, allowing for microbial respiration of previously frozen C. Furthermore, soil destabilization from melting ice has caused an increase in thermokarst failures that expose buried C and release dissolved organic C (DOC) to surface waters. Once exposed,...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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