OO/DEVS: A platform for industry simulation and strategic modelling

Ninios, P.; Vlahos, Kiriakos; Bunn, Derek W.

doi:10.1016/0167-9236(95)00013-v

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…Although several studies have evaluated the algal ecological response to air fall tephra into lacustrine environments (Harper, Howorth & McLeod, 1986; Lotter et al, 1992; Lotter & Birks, 1993; Hickman & Reasoner, 1994; Hickman & Reasoner, 1998; Lotter et al, 1998; Eastwood et al, 2002; Barker et al, 2003; Telford et al, 2004; Cruces et al, 2006; Urrutia et al, 2007; Jovanovska et al, 2016) little data is available for the impact of episodic tephra deposition in lakes in subarctic regions. Ash layers reported previously in the literature are also generally at least an order of magnitude thicker than the one observed in Pocket Lake (Harper, Howorth & McLeod, 1986; Lotter & Birks, 1993; Lotter, Birks & Zolitschka, 1994; Hickman & Reasoner, 1994; Jovanovska et al, 2016). Ecological response of lacustrine systems to ashfall varies considerably, from no observed impact to considerable influence on diatom assemblages, making it difficult to identify causal relationships.…”

Section: Introductionmentioning

confidence: 43%

Diatom ecological response to deposition of the 833-850 CE White River Ash (east lobe) ashfall in a small subarctic Canadian lake

Hutchinson

Hamilton

Patterson

et al. 2019

PeerJ

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A <5 mm thick volcanic ashfall layer associated with the White River Ash (east lobe [WRAe]) originating from the eruption of Mount Churchill, Alaska (833-850 CE; 1,117–1,100 cal BP) was observed in two freeze cores obtained from Pocket Lake (62.5090°N, −114.3719°W), a small subarctic lake located within the city limits of Yellowknife, Northwest Territories, Canada. Here we analyze changes in diatom assemblages to assess impact of tephra deposition on the aquatic biota of a subarctic lake. In a well-dated core constrained by 8 radiocarbon dates, diatom counts were carried out at 1-mm intervals through an interval spanning 1 cm above and below the tephra layer with each 1 mm sub-sample represented about 2 years of deposition. Non-metric Multidimensional Scaling (NMDS) and Stratigraphically Constrained Incremental Sum of Squares (CONISS) analyses were carried out and three distinct diatom assemblages were identified throughout the interval. The lowermost “Pre-WRAe Assemblage (Pre-WRAeA)” was indicative of slightly acidic and eutrophic lacustrine conditions. Winter deposition of the tephra layer drove a subsequent diatom flora shift to the “WRAe Assemblage (WRAeA)” the following spring. The WRAeA contained elevated abundances of taxa associated with oligotrophic, nutrient depleted and slightly more alkaline lake waters. These changes were only apparent in samples within the WRAe containing interval indicating that they were short lived and only sustained for a single year of deposition. Immediately above the WRAe horizon, a third, “Post-WRAe Assemblage (Post-WRAeA)” was observed. This assemblage was initially similar to that of the Pre-WRAeA but gradually became more distinct upwards, likely due to climatic patterns independent of the WRAe event. These results suggest that lacustrine environments are sensitive to perturbations such as deposition of ash fall, but that ecological communities in subarctic systems can also have high resilience and can recover rapidly. If subsampling of the freeze cores was carried out at a more standard resolution (0.5–1 cm) these subtle diatom ecological responses to perturbation associated with the WRAe depositional event would not have been observed. This research illustrates the importance of high-resolution subsampling when studying the environmental impact of geologically “near instantaneous” events such as episodic deposition of ashfalls.

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Section: Introductionmentioning

confidence: 43%

Diatom ecological response to deposition of the 833-850 CE White River Ash (east lobe) ashfall in a small subarctic Canadian lake

Hutchinson

Hamilton

Patterson

et al. 2019

PeerJ

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“…Sample collection using a freeze corer in conjunction with processing via a custom sledge microtome allowed for a sample resolution of ~1.5 years. Most prior studies investigating the diatom response to tephra involve tephra much thicker sections than that observed in Pocket Lake and at a far coarser resolution (Harper et al, 1986;Lotter and Birks, 1993;Lotter et al, 1994;Hickman and Reasoner, 1994;Jovanovska et al, 2016). Deposition of airfall tephra often occurs as a nearly instantaneous event.…”

Section: Research Gaps Addressedmentioning

confidence: 98%

“…Although several studies have evaluated the algal ecological response to air fall tephra into lacustrine environments (Harper et al, 1986;Lotter et al, 1992;Lotter and Birks, 1993;Hickman and Reasoner, 1994;Hickman and Reasoner, 1998;Lotter et al, 1998;Eastwood et al, 2002 ;Barker et al, 2003;Telford et al, 2004;Cruces et al, 2006;Urrutia et al, 2007;Jovanovska et al, 2016) little data is available for the impact of episodic tephra deposition in lakes in subarctic regions Ash layers reported previously in the literature are also generally at least an order of magnitude thicker than the one observed in Pocket Lake (Harper et al, 1986;Lotter and Birks, 1993;Lotter et al, 1994;Hickman and Reasoner, 1994;Jovanovska et al, 2016). Ecological response of lacustrine systems to ashfall varies considerably, from no observed impact to considerable influence on diatom assemblages, making it difficult to identify causal relationships.…”

Section: Introductionmentioning

confidence: 99%

Diatoms in Lake Sediments as Proxies of Climatic Variation Throughout the Latest Holocene

Hutchinson¹

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This thesis is composed of manuscripts investigating the impact of climate events throughout the past ~2800 years on conditions within the lacustrine environment of Pocket Lake as reflected in changes of diatom assemblage. The first manuscript presented in chapter 2 is composed of a broad, paleoclimatic reconstruction at a resolution of ~20-30 years per sample based on changes in diatom assemblage integrated with geochemical and particle size datasets from the same core. In the second chapter a high-resolution investigation into the impact of the deposition of airfall tephra into Pocket Lake is presented. Together, these studies provide insight into the impact of broader decadal scale climate cycles and instantaneous, episodic events allowing for a more comprehensive understanding of their impact on lakes in sensitive, northern locations. These reconstructions will help inform predications regarding the potential impact of 21 st century climate change.

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