Coupling temporal and spatial dimensions of global sediment flux through lake and marine sediment records

Dearing, John A.; Jones, Richard T.

doi:10.1016/s0921-8181(03)00022-5

Cited by 265 publications

(210 citation statements)

References 89 publications

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“…Effects on deforestation of eastern North America by ancestral European settlers 200 yr ago appear highly similar to those recorded for sites in northwestern Europe and Central America thousands of years ago (Davis 1976;Anselmetti et al 2007). In all cases, rates of m accumulation in lake sediments increase dramatically (up to 20-fold) with forest clearance, although the magnitude of erosion and m transfer to lakes also depends on complex interactions between precipitation, geology, soils, and the precise use of land following forest clearance (Dearing and Jones 2003). In instances where erosive influx is sustained, lakes can exhibit rapid infilling, reduced basin depth, and expansions of macrophyte populations that alter habitat Fig.…”

Section: Fossil Evidence Of Climate Effects On Lakessupporting

confidence: 63%

Paleolimnological evidence of the effects on lakes of energy and mass transfer from climate and humans

Leavitt

Fritz

Anderson

et al. 2009

Limnology & Oceanography

169

174

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The premise of this article is that climate effects on lakes can be quantified most effectively by the integration of process-oriented limnological studies with paleolimnological research, particularly when both disciplines operate within a common conceptual framework. To this end, the energy (E)-mass (m) flux framework (Em flux) is developed and applied to selected retrospective studies to demonstrate that climate variability regulates lake structure and function over diverse temporal and spatial scales through four main pathways: rapid direct transfer of E to the lake surface by irradiance, heat, and wind; slow indirect effects of E via changes in terrestrial development and subsequent m subsidies to lakes; direct influx of m as precipitation, particles, and solutes from the atmosphere; and indirect influx of water, suspended particles, and dissolved substances from the catchment. Sedimentary analyses are used to illustrate the unique effects of each pathway on lakes but suggest that interactions among mechanisms are complex and depend on the landscape position of lakes, catchment characteristics, the range of temporal variation of individual pathways, ontogenetic changes in lake basins, and the selective effects of humans on m transfers. In particular, preliminary synthesis suggests that m influx can overwhelm the direct effects of E transfer to lakes, especially when anthropogenic activities alter m subsidies from catchments.The structure and function of lake ecosystems is regulated by complex interactions among climate, humans, ecosystem morphology, and catchment characteristics, each of which varies in time and space (Schindler 2001). For example, climatic controls range from daily meteorological variations in local irradiance, temperature, and water fluxes (Keller 2007) through to large-scale interactions of the atmosphere and oceans (Trenberth and Hurrell 1994;Hurrell 1995;Mantua et al. 1997) and millennium-long changes in energy (E) and mass (m) flux around the planet (Williams et al. 1997;Diffenbaugh et al. 2006). Within this framework, chemical, physical, and ecological processes combine to determine the production and composition of aquatic communities, both uniquely and in consort with other mechanisms (Carpenter 1999). In addition, lakes are affected both by human disturbance of biotic communities and biogeochemical cycles (e.g., land use, urbanization, fisheries management) and by creation of novel stressors (e.g., acidic precipitation, toxicants, ozone loss). However, because these factors interact over diverse spatial and temporal scales, it is difficult to determine the relative importance of regulatory processes using only traditional site-based observation and experimentation. Instead, it is the premise of this article that the combined use of limnology and paleoecology represents the best means to quantify and scale interactions between climate and other control mechanisms and to develop a hierarchical understanding of how these regulatory processes are likely to influence lakes pres...

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Section: Fossil Evidence Of Climate Effects On Lakessupporting

confidence: 63%

Paleolimnological evidence of the effects on lakes of energy and mass transfer from climate and humans

Leavitt

Fritz

Anderson

et al. 2009

Limnology & Oceanography

169

174

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“…Understanding the respective roles of climate and land-use change on long-term ecosystem dynamics have become an important issue of palaeo-studies (Dearing et al, 2006;Hoffmann et al, 2010), particularly since the Ruddiman's hypothesis about the anthropogenic greenhouse era (2003,2007). One of the main questions addresses the tipping elements that indicate ecosystems dynamics (Lenton et al, 2008) over the Holocene controlled by climatic or human forcing factors (Hoffmann et al, 2008;Magny et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Orbital changes, variation in solar activity and increased anthropogenic activities: controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy

et al. 2013

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Abstract. Two lacustrine sediment cores from Lake Ledro in northern Italy were studied to produce chronologies of flood events for the past 10 000 yr. For this purpose, we have developed an automatic method that objectively identifies the sedimentary imprint of river floods in the downstream lake basin. The method was based on colour data extracted from processed core photographs, and the count data were analysed to capture the flood signal. Flood frequency and reconstructed sedimentary dynamics were compared with lake-level changes and pollen inferred vegetation dynamics. The results suggest a record marked by low flood frequency during the early and middle Holocene (10 000–4500 cal BP). Only modest increases during short intervals are recorded at ca. 8000, 7500, and 7100 cal BP. After 4500–4000 cal BP, the record shows a shift toward increased flood frequency. With the exception of two short intervals around 2900–2500 and 1800–1400 cal BP, which show a slightly reduced number of floods, the trend of increasing flood frequency prevailed until the 20th century, reaching a maximum between the 16th and the 19th centuries. Brief-flood frequency increases recorded during the early and middle Holocene can be attributed to cold climatic oscillations. On a centennial time scale, major changes in flood frequency, such as those observed after ca. 4500/4000 and 500 cal BP, can be attributed to large-scale climatic changes such as the Neo-glacial and Little Ice Age, which are under orbital and possibly solar control. However, in the Bronze Age and during the Middle Ages and modern times, forest clearing and land use probably partially control the flood activity.

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“…In order to better understand the potential effects of on-going climate change on continental environments, it is essential to disentangle the respective contributions of Holocene climate variability and the evolution of human activities on past environmental changes (Dearing and Jones, 2003;Magny, 2004;Desmet et al, 2005;Jungclaus et al, 2010). Glaciers are important climate indicators because their fluctuations are both sensitive to summer air temperature, winter precipitations and solar irradiance (Holzhauser et al, 2005;Vincent et al, 2005;Joerin et al, 2006).…”

mentioning

confidence: 99%

Tracking Holocene glacial and high-altitude alpine environments fluctuations from minerogenic and organic markers in proglacial lake sediments (Lake Blanc Huez, Western French Alps)

Simonneau

Chapron

Garçon

et al. 2014

Quaternary Science Reviews

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Coupling temporal and spatial dimensions of global sediment flux through lake and marine sediment records

Cited by 265 publications

References 89 publications

Paleolimnological evidence of the effects on lakes of energy and mass transfer from climate and humans

Paleolimnological evidence of the effects on lakes of energy and mass transfer from climate and humans

Orbital changes, variation in solar activity and increased anthropogenic activities: controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy

Tracking Holocene glacial and high-altitude alpine environments fluctuations from minerogenic and organic markers in proglacial lake sediments (Lake Blanc Huez, Western French Alps)

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