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Moore, J.; Hughen, Konrad A; Miller, Gifford H.; Overpeck, Jonathan T.

doi:10.1023/a:1011181301514

Cited by 153 publications

(23 citation statements)

References 43 publications

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“…In thin section, laminae appear as light-colored layer and dark-colored layer (clay cap) ( Figure 2). This varve formation is the classic mode reported in many lakes in the Arctic and other glaciated areas [Lamoureux and Bradley, 1996;Moore et al, 2001;Francus et al, 2008;Menounos and Clague, 2008]. The light-colored layer is composed mainly of silt, with a gradual textural transition to the dark-colored layer.…”

Section: Varves and Radiometric Datingmentioning

confidence: 63%

“…[20] Previous studies have demonstrated that varve thickness could be controlled by various factors, such as summer temperature [Leemann and Niessen, 1994;Hughen et al, 2000;Moore et al, 2001;Loso et al, 2006, Tomkins et al, 2008, snowmelt runoff [Leemann and Niessen, 1994] and hydroclimatic parameter [Lamoureux and Gilbert, 2004;Desloges and Gilbert, 1994;Sander et al, 2002;Menounos et al, 2005;Hodder et al, 2007;Cockburn and Lamoureux, 2007]. The relationship between varve formation and climatic factors is very complex.…”

Section: Extracting the Climate Signal From Varved Sedimentmentioning

confidence: 99%

“…However, only a few laminated sediments have been found in Asia [Kawakami et al, 2004;Kato et al, 2004;Mingram et al, 2004;Nakagawa et al, 2005;Zhou et al, 2007;Chu et al, 2008]. Glacial varves are annually laminated sediments that are commonly found in proglacial lakes in the Arctic and in some high mountains or high-latitude regions [e.g., Hardy et al, 1996;Gajewski et al, 1997;Moore et al, 2001;Lamoureux and Gilbert, 2004;Sun et al, 2006;Loso, 2009]. They provide detailed climate information and an inherent annual chronology for high-resolution paleoclimatic reconstruction in the Arctic and in high mountains regions.…”

Section: Introductionmentioning

confidence: 99%

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Evidence for decreasing South Asian summer monsoon in the past 160 years from varved sediment in Lake Xinluhai, Tibetan Plateau

Chu

Sun²,

Yang

et al. 2011

J. Geophys. Res.

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[1] We report glacial varves in the sediment of Lake Xinluhai, Tibetan Plateau. Independent data of 137 Cs and 210 Pb indicate that these are annually deposited varves. Varves appear as rhythmic units of light-colored silt layer capped by a dark clay layer under microscope. Varve thickness in Lake Xinluhai is sensitive to precipitation because sediment accumulation is strongly affected by monsoon rainfall in the area. A general decreasing trend can be observed in the varve thickness over the past 160 years. Spectral analyses of the varve record are dominated by cycles which are similar to ENSO periodicities. It implies that the decreasing trend of the South Asia monsoon may be linking with ENSO. Spatially, the decreasing trend can be observed across different proxy records in the south of the Tibetan Plateau. Although arguments still remain for the dynamic mechanisms and spatial rainfall difference, the South Asian summer monsoon could be weakened due to rising temperatures.

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Section: Varves and Radiometric Datingmentioning

confidence: 63%

Section: Extracting the Climate Signal From Varved Sedimentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evidence for decreasing South Asian summer monsoon in the past 160 years from varved sediment in Lake Xinluhai, Tibetan Plateau

Chu

Sun²,

Yang

et al. 2011

J. Geophys. Res.

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“…4.1(a,c,e) are shown in Fig. 4.1(g) together with those obtained from the reconstructed temperature record of Baffin Island [27] and the reconstructed precipitation in New Mexico (USA) [28]. The measured γ values are 0.8 (Sacramento), 0.55 (Baffin), 0.4 (New Mexico), 0.3 (Nile), and 0.1 (Northern hemisphere).…”

Section: Introductionmentioning

confidence: 85%

“…In (g) the corresponding correlation exponents have been determined. The slopes α of the DFA2 fluctuation function are related to the γ values via α = 1 − γ/2; the results for the reconstructed temperature record of Baffin Island [27] and the reconstructed precipitation in New Mexico (USA) [28] are also included. The measured γ values are 0.8 (Sacramento), 0.55 (Baffin), 0.4 (New Mexico), 0.3 (Nile), and 0.1 (Northern hemisphere).…”

Section: Introductionmentioning

confidence: 99%

Return Intervals and Extreme Events in Persistent Time Series with Applications to Climate and Seismic Records

Bunde

Eichner

Havlin

et al. 2008

Reviews of Nonlinear Dynamics and Complexity

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Many natural records exhibit long-term persistence characterized by correlation functions C(s) ∼ s −γ with exponents γ between 0 and 1. We review our studies of the statistics of return intervals and extreme events (maxima) in long correlated data sets with different (Gaussian, exponential, powerlaw, and log-normal) distributions and discuss applications to geophysical records. We found (i) a stretched exponential distribution of the return intervals (Weibull distribution with an exponent equal to γ), (ii) clustering of both small and large return intervals, and (iii) a counter-intuitive behavior of the mean residual time to the next extreme event. For maxima within time segments of fixed duration R we found that (i) the integrated distribution function converges to a Gumbel distribution for large R, (ii) the speed of the convergence depends on both, the long-term correlations and the initial distribution of the values, (iii) the maxima series exhibit long-term correlations similar to those of the original data, and most notably (iv) the maxima distribution as well as the mean maxima significantly depend on the history, in particular on the previous maximum. Most of the effects revealed in artificial data are found in hydrological and climatological data series. Finally, we present indications that the magnitudes of earthquakes, in regimes of stationary seismicity, are also long-term correlated, and that the anomalous statistics of their return intervals can be explained by these correlations.

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Investigating individual migration life histories: An isotopic case study from 17th to 18th century Nouvelle France

Vigeant

Ribot

Hélie

2021

American Journal of Biological Anthropology

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Objectives This isotopic study explores the mobility patterns of a growing urban population from Notre Dame's Catholic cemetery (1691–1796), located in Montreal (Canada). The site offers a unique opportunity to investigate early colonial settlement in Nouvelle France through individual life patterns. Materials and methods Stable oxygen isotopic compositions (δ18O) were measured on the enamel of 32 individuals from the Notre Dame collection. Premolars and third molars were selected, as they reflected the δ18O of the drinking water during childhood (2.5–5.5 years) and pre‐adulthood (9.5–15.5 years). Firstly, premolars from three children (4–8 years of age) allowed us to provide a mean δ18O for the water consumed locally (22.7 ± 1.0 ‰ vs. VSMOW). Then, our δ18O were compared with published data from various geographical regions in North America (Eastern Canada and the United States) and Europe (France and the British Isles) to highlight mobility patterns of each individual. Results Forty‐eight percent of our sample (14 out of 29 individuals) did not reflect any long‐distance mobility, as all their δ18O reflected Montreal's variation during their lifetime. The remaining (15 out of 29 individuals) experienced mobility within (n = 8) and outside (n = 7) North America and at different phases of their life (five at pre‐adulthood, six at adulthood and four during both phases). Their migration patterns were analyzed according to age, sex, diet and possible ancestry in order to propose some “biographies.” Discussion This study highlights high population diversity in early colonial Montreal. Historians wrote that the city was growing, not only with the arrival of Europeans (e.g., young male workers, sailors), but also other groups (e.g., Indigenous people, slaves from North America). Additional analyses (e.g., ancient DNA) will be needed to explore further this phenomenon.

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Cited by 153 publications

References 43 publications

Evidence for decreasing South Asian summer monsoon in the past 160 years from varved sediment in Lake Xinluhai, Tibetan Plateau

Evidence for decreasing South Asian summer monsoon in the past 160 years from varved sediment in Lake Xinluhai, Tibetan Plateau

Return Intervals and Extreme Events in Persistent Time Series with Applications to Climate and Seismic Records

Investigating individual migration life histories: An isotopic case study from 17th to 18th century Nouvelle France

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