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Murky Waters : = Discerning among Sources of Natural Variation under High Uncertainty and at Multiple Scales.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Murky Waters :/
其他題名:	Discerning among Sources of Natural Variation under High Uncertainty and at Multiple Scales.
作者:	Vlah, Michael.
面頁冊數:	1 online resource (100 pages)
附註:	Source: Masters Abstracts International, Volume: 56-06.
標題:	Aquatic sciences. -
電子資源:	click for full text (PQDT)
ISBN:	9780355122688

Murky Waters : = Discerning among Sources of Natural Variation under High Uncertainty and at Multiple Scales.
Vlah, Michael.

Murky Waters :Discerning among Sources of Natural Variation under High Uncertainty and at Multiple Scales. - 1 online resource (100 pages)

Source: Masters Abstracts International, Volume: 56-06.

Thesis (Master's)--University of Washington, 2017.

Includes bibliographical references

Fresh waters account for an inordinately large portion of Earth's carbon burial and methane production. As such, they are major components of energy flow within and between ecosystems. Yet, the roles of lakes and rivers as sources, conduits, and sinks of energy, and as providers of ecosystem services are incompletely understood. High elevation aquatic systems are of particular concern due their high susceptibility to variation under changing regional climates. I investigated the proportion of consumer biomass derived from terrestrial sources, allochthony, in three metabolic classes of high elevation lakes using a modular, Bayesian, stable isotope mixing model. Additionally, I quantified the influence of local- and regional-scale environmental drivers on flow and thermal regime across three flow-source classes of rivers using dynamic factor analysis. The most probable estimate of allochthony across consumer taxa was 41% in small-montane lakes. For large-montane and alpine lakes, allochthony was just 4 and 3%, respectively. These results corroborate previous findings that lake size, depth, and light penetration are dominant physical controls on allochthony, but add that it sharply declines at high elevation due to changes in terrestrial primary production near or above tree line. I also found that primarily rain-fed rivers undergo large seasonal temperature fluctuations that closely track air temperature---high coupling---while snow-fed rivers tend to be more weakly, and in some cases inversely, coupled with air temperature fluctuation due to influx of meltwater. However, variation in coupling among snow-fed rivers is high and disproportionately influenced by artificial reservoirs, which appear to magnify the buffering effect of melting snow and glacial ice on riverine thermal regimes in summer.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355122688Subjects--Topical Terms:

1178821
Aquatic sciences.
Index Terms--Genre/Form:

554714
Electronic books.

Murky Waters : = Discerning among Sources of Natural Variation under High Uncertainty and at Multiple Scales.
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502 $a Thesis (Master's)--University of Washington, 2017.
504 $a Includes bibliographical references
520 $a Fresh waters account for an inordinately large portion of Earth's carbon burial and methane production. As such, they are major components of energy flow within and between ecosystems. Yet, the roles of lakes and rivers as sources, conduits, and sinks of energy, and as providers of ecosystem services are incompletely understood. High elevation aquatic systems are of particular concern due their high susceptibility to variation under changing regional climates. I investigated the proportion of consumer biomass derived from terrestrial sources, allochthony, in three metabolic classes of high elevation lakes using a modular, Bayesian, stable isotope mixing model. Additionally, I quantified the influence of local- and regional-scale environmental drivers on flow and thermal regime across three flow-source classes of rivers using dynamic factor analysis. The most probable estimate of allochthony across consumer taxa was 41% in small-montane lakes. For large-montane and alpine lakes, allochthony was just 4 and 3%, respectively. These results corroborate previous findings that lake size, depth, and light penetration are dominant physical controls on allochthony, but add that it sharply declines at high elevation due to changes in terrestrial primary production near or above tree line. I also found that primarily rain-fed rivers undergo large seasonal temperature fluctuations that closely track air temperature---high coupling---while snow-fed rivers tend to be more weakly, and in some cases inversely, coupled with air temperature fluctuation due to influx of meltwater. However, variation in coupling among snow-fed rivers is high and disproportionately influenced by artificial reservoirs, which appear to magnify the buffering effect of melting snow and glacial ice on riverine thermal regimes in summer.
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