15 k.y. paleoclimatic and glacial record from northern New Mexico

Armour, Jake; Fawcett, Peter J.; Geissman, John W.

doi:10.1130/0091-7613(2002)030<0723:kypagr>2.0.co;2

Cited by 48 publications

(38 citation statements)

References 20 publications

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“…The predominance of Artemisia during the Late Pleistocene is also indicative of relatively cold conditions. This is consistent with cold conditions known to have prevailed in the Sangre de Cristo Mountains (east of the Chihuahueños bog site), during this period (Armour et al , 2002; Jiménez‐Moreno et al , 2008).…”

Section: Resultssupporting

confidence: 86%

“…3). Proxy evidence for the Younger Dryas period, aside from pollen records, has also been observed in records from the Sangre de Cristo Mountains (Armour et al , 2002; Jiménez‐Moreno et al , 2008) and other regions (MacDonald et al , 2008). Following our criteria for the interpretation of the proxies measured in the Chihuahueños record, we observe that except for the Younger Dryas interval, organic carbon content, δ 13 C, δ 15 N and C/N values suggest increasing terrestrial productivity at the site, starting ca.…”

Section: Resultsmentioning

confidence: 74%

“…These climate changes have not been consistent in timing and/or intensity across different sites. In addition, few continuous records of climate change span the important postglacial transition from the Late Pleistocene into the Holocene in New Mexico (Allen and Anderson, 2000; Armour et al , 2002; Asmerom et al , 2007; Anderson et al , 2008; Jiménez‐Moreno et al , 2008). In this paper, we present a climate record that expands on previous work by Anderson et al (2008) and provides new insights into periods of climate change during the Late Pleistocene and Holocene in northern New Mexico.…”

Section: Introductionmentioning

confidence: 99%

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A 15 000‐year record of climate change in northern New Mexico, USA, inferred from isotopic and elemental contents of bog sediments

Cisneros-Dozal

Heikoop

Fessenden

et al. 2010

J Quaternary Science

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Elemental (C, N, Pb) and isotopic (δ13C, δ15N) measurements of cored sediment from a small bog in northern New Mexico reveal changes in climate during the Late Pleistocene and Holocene. Abrupt increases in Pb concentration and δ13C values ca. 14 420 cal. YBP indicate significant runoff to the shallow lake that existed at that time. Weathering and transport of local volcanic rocks resulted in the delivery of Pb‐bearing minerals to the basin, while a 13C‐enriched terrestrial vegetation source increased the δ13C values of the sedimentary material. Wet conditions developed over a 300 a period and lasted for a few hundred years. The Younger Dryas period (ca. 12 700–11 500 cal. YBP) caused a reduction in terrestrial productivity reflected in decreasing C/N values, δ15N values consistently greater than 0‰ and low organic content. By contrast, aquatic productivity increased during the second half of this period, evidenced by increasing δ13C values at the time of highest abundance of algae. Dry conditions ca. 8 000–6 000 cal. YBP were characterised by low organic carbon content and high Pb concentrations, the latter suggesting enhanced erosion and aeolian transport of volcanic rock. The range in δ13C, δ15N and C/N values in the sedimentary record fall within the range of modern plants, except during the periods of runoff and drought. The sedimentary record provides evidence of natural climate variability in northern New Mexico, including short‐ (multi‐centennial) and long‐(millennial) term episodes during the Late Pleistocene and Holocene. Copyright © 2010 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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A 15 000‐year record of climate change in northern New Mexico, USA, inferred from isotopic and elemental contents of bog sediments

Cisneros-Dozal

Heikoop

Fessenden

et al. 2010

J Quaternary Science

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“…A glacial moraine in the central portions of the basin is underlain predominantly by Tertiary volcanics, which are situated over a block of Precambrian quartzite (Luedke and Burbank, 1976). Composite stratigraphy of Holocene glaciations and periglacial episodes in southern Colorado and northern New Mexico have been established by Richmond (1986) and Armour et al (2002). The outer portions of the basin contain abundant Quaternary deposits of the San Juan Formation with limited exposures of granodiorite and gabbro stock.…”

Section: San Juan Mountains Colorado Usamentioning

confidence: 99%

Development of tongue-shaped and multilobate rock glaciers in alpine environments – Interpretations from ground penetrating radar surveys

Degenhardt

2009

Geomorphology

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“…Armour et al, 2002) as well as increased fire-frequency (e.g. The local pollen record is difficult to interpret during this period with evidence of warming and cooling exhibited by different pollen proxies.…”

Section: Incisionmentioning

confidence: 98%

Post‐glacial range of variability in the Conejos River Valley, southern Colorado, USA: fluvial response to climate change and sediment supply

Eppes

Johnson

Diemer

2012

Earth Surf Processes Landf

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Effective river management strategies require an understanding of how fluvial processes vary both spatially and temporally. Here, we examine the natural range of variability in the Conejos River Valley, southern Colorado, through documentation of terrace morphostratigraphic and sedimentological characteristics as well as through investigation of sediment contributions from headwaters, hillslopes and tributary streams. Additionally, soil development and radiocarbon ages, together with local and regional paleoclimate reconstructions, were used to infer the range of processes acting in this system. Since de‐glaciation, the Conejos River has fluctuated between episodes of bedrock strath formation, aggradation and vertical incision. Morphostratigraphic relationships, soil development and radiocarbon ages enable us to propose a chronology for periods of alluvial deposition (around 8·9–7·6 ka, 5·5 ka and from 3·5 to 1·1 ka), separated by intervals of fluvial incision. We infer potential forcing mechanisms by utilizing multiple working hypotheses. Specifically, we discuss the potential for increases in sediment supply during periods of (1) para‐glacial adjustment, (2) climatic cooling, (3) increased frequency of climate change and (4) increased fire frequency or severity. We also consider the effects of changes in stream discharge and extreme storm occurrence. We conclude that combinations of these processes, operating at different times, have contributed to sediment mobilization since de‐glaciation. Stream and landform morphology also varies longitudinally due to the influence of remnant glacial topography. In particular, valley bottom overdeepening at tributary junctions has resulted in incision and strath formation into unlithified glacial deposits (i.e. fill‐cut terraces) rather than bedrock in some reaches. Overall, the Conejos fluvial system has varied significantly both temporally and spatially since de‐glaciation and appears to be sensitive to changes in sediment supply related to Holocene scale climate fluctuations. This natural range of variability must therefore be a key consideration in any future stream management policies. Copyright © 2012 John Wiley & Sons, Ltd.

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15 k.y. paleoclimatic and glacial record from northern New Mexico

Cited by 48 publications

References 20 publications

A 15 000‐year record of climate change in northern New Mexico, USA, inferred from isotopic and elemental contents of bog sediments

A 15 000‐year record of climate change in northern New Mexico, USA, inferred from isotopic and elemental contents of bog sediments

Development of tongue-shaped and multilobate rock glaciers in alpine environments – Interpretations from ground penetrating radar surveys

Post‐glacial range of variability in the Conejos River Valley, southern Colorado, USA: fluvial response to climate change and sediment supply

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