Restricted accessResearch articleFirst published online 2013-7
A multiproxy record of postglacial climate variability from a shallowing,12-m deep sub-alpine bog in the southeastern San Juan Mountains of Colorado,USA
Pollen assemblages, diatom assemblages, and sedimentology, from Cumbres Bog in the southeastern San Juan Mountains of Colorado, provide a record of climate and environmental change since the end of the last glacial maximum (LGM). Cumbres Bog is unusually deep (basal sediments extend 12 m below the surface) for its altitude (~3050 m a.s.l.) and we extracted 7 m core of continuous sediment below ~5 m of water and peat. The resulting record provides strong evidence of: a period of warming immediately after the LGM (~18–13 cal. kyr BP), a cool interval coinciding with the Younger Dryas (~12.8–11.5 cal. kyr BP), a warm stable period from 10 to 6 cal. kyr BP, and a cooler and highly variable climate interval after 6 cal. kyr BP. More specifically, pollen ratios and fossil diatoms indicate that cold periods generally match with previously identified periods of rapid climate change that occurred at 10.6, 8.7–7.9, 7.0–6.9, 5.4–5.2, 3.3–3.0, 2.3, 2.0 and 1.5 cal. kyr BP. This record also adds resolution to previous regional records and indicates that the periodicity of climate variability changed from 2000–3000 years to 700–1100 years around 6 cal. kyr BP and to <500 years after 3.5 cal. kyr BP. Overall, our record provides important, relatively high-resolution paleoclimatic information for this remote region of the southern Rockies.
AdamsDKComrieAC (1997) The North American monsoon. Bulletin of the American Meteorological Society78(10): 2197.
2.
AndersonRSBetancourtJLMeadJI. (2000) Middle- and late-Wisconsin paleobotanic and paleoclimatic records from the southern Colorado Plateau, USA. Palaeogeography, Palaeoclimatology, Palaeoecology155(1–2): 31–57.
3.
ArmourJFawcettPJGeissmanJW (2002) 15 k.y. paleoclimatic and glacial record from northern New Mexico. Geology30(8): 723–727.
4.
AsmeromYPolyakVBurnsS. (2007) Solar forcing of Holocene climate: New insights from a speleothem record, southwestern United States. Geology35(1): 1–4.
5.
AtwoodWWMatherKF (1932) Physiography and Quaternary geology of the San Juan Mountains, Colorado. U.S. Geological Survey Professional Paper166: 176–201.
6.
BattarbeeRW (1986) Diatom analysis. In: BerglundB (ed.) Handbook of Holocene Palaeoecology and Palaeohydrology. New York: Wiley, pp. 527–570.
7.
BenedictJB (1973) Chronology of cirque glaciation, Colorado Front Range. Quaternary Research3: 584–600.
8.
BensonLMadoleRLandisG. (2005) New data for Late Pleistocene Pinedale alpine glaciation from southwestern Colorado. Quaternary Science Reviews24(1–2): 49–65.
9.
BondGShowersWChesebyM. (1997) A pervasive millennial-scale cycle in North Atlantic Holocene and glacial climates. Science278(5341): 1257–1266.
10.
BroeckerWSDentonGHEdwardsRL. (2010) Putting the Younger Dryas cold event into context. Quaternary Science Reviews29(9–10): 1078–1081.
11.
CairnsDMMalansonGP (1998) Environmental variables influencing the carbon balance at alpine treeline: A modeling approach. Journal of Vegetation Science9: 679–692.
12.
CarraraPEAndrewsJT (1976) Holocene glacial/periglacial record; Northern San Juan Mountains, Southwestern Colorado. Zeitschrift Fur Gletscherkunde and Glazialgeologie11(2): 155–174.
13.
CarraraPEModeWNRubinM (1984) Deglaciation and postglacial timberline in the San Juan Mountains, Colorado. Quaternary Research21: 42–55.
14.
CarraraPETrimbleDARubinM (1991) Holocene treeline fluctuations in the northern San Juan Mountains, Colorado, U.S.A., as indicated by radiocarbon-dated conifer wood. Arctic and Alpine Research23(3): 233–246.
15.
CayanDR (1996) Interannual climate variability and snowpack in the western United States. Journal of Climate9(5): 928–948.
16.
Cisneros-DozalLMHeikoopJMFessendenJ. (2010) A 15 000-year record of climate change in northern New Mexico, USA, inferred from isotopic and elemental contents of bog sediments. Journal of Quaternary Science25(6): 1001–1007.
DeanWE (1974) Determination of carbonate and organic matter in calcareous sediments and sedimentary rocks by loss on ignition: comparison with other methods. Journal of Sedimentary Research44(1): 242–246.
19.
DeanWESchwalbA (2000) Holocene environmental and climatic change in the Northern Great Plains as recorded in the geochemistry of sediments in Pickerel Lake, South Dakota. Quaternary International67(1): 5–20.
20.
DentonGHKarlenW (1973) Holocene climatic variations: Their pattern and possible cause. Quaternary Research3: 155–205.
21.
EliasSACarraraPEToolinLJ. (1991) Revised age of deglaciation of Lake Emma based on new radiocarbon and macrofossil analysis. Quaternary Research36: 307–321.
22.
EngstromDRFritzSC (2006) Coupling between primary terrestrial succession and the trophic development of lakes at Glacier Bay, Alaska. Journal of Paleolimnology35: 873–880.
23.
FaegriKIversenJ (1989) Textbook of Pollen Analysis. New York: Wiley.
24.
FallPL (1997) Timberline fluctuations and late Quaternary paleoclimates in the southern Rocky Mountains, Colorado. Geological Society of America Bulletin109(10): 1306–1320.
25.
FeilerEJAndersonRSKoehlerPA (1997) Late Quaternary paleoenvironments of the White River Plateau, Colorado, U.S.A. Arctic and Alpine Research29(1): 53–62.
26.
FritzSCKreiserAMApplebyPG. (1990) Recent acidification of upland lakes in north and mid-Wales: Paleolimnological evidence. In: EdwardsRWGeeASStonerJH (eds) Acid Waters in Wales. Dordrecht: Kluwer Academic Publishers, pp. 27–37.
27.
GosseJCEvensonEBKleinJ. (1995) Precise cosmogenic 10Be measurements in western North America: Support for a global Younger Dryas cooling event. Geology23(10): 877–880.
28.
Grissino-MayerHDRommeWHLisa FloydM. (2004) Climatic and human influences on fire regimes of the southern San Juan Mountains, Colorado, USA. Ecology85(6): 1708–1724.
29.
GuidoZSWardDJAndersonRS (2007) Pacing the post-Last Glacial Maximum demise of the Animas Valley glacier and the San Juan Mountain ice cap, Colorado. Geology35(8): 739–742.
30.
HoffmanJSCarlsonAEWinsorK. (2012) Linking the 8.2 ka event and its freshwater forcing in the Labrador Sea. Geophysical Research Letters39(18).
31.
JewsonDH (1992) Size reduction, reproductive strategy and the life cycle of a centric diatom. Philosophical Transactions of the Royal Society of London B336: 191–212.
32.
Jiménez-MorenoGAndersonRS (2013) Pollen and macrofossil evidence of Late Pleistocene and Holocene treeline fluctuations from an alpine lake in Colorado, USA. The Holocene23(1): 68–79.
33.
Jiménez-MorenoGFawcettPJAndersonRS (2008) Millennial- and centennial-scale vegetation and climate changes during the late Pleistocene and Holocene from northern New Mexico (USA). Quaternary Science Reviews27(13–14): 1442–1452.
34.
Jiménez-MorenoGAndersonRSAtudoreiV. (2011) A high-resolution record of climate, vegetation, and fire in the mixed conifer forest of northern Colorado (USA). Geological Society of America Bulletin123: 240–254.
35.
JohnsonBGEppesMCDiemerJA (2010) Surficial geologic map of the upper Conejos River drainage, southeastern San Juan Mountains, southern Colorado. Journal of Maps2010: 30–39.
36.
JohnsonBGEppesMCDiemerJA. (2011) Post-glacial landscape response to climate variability in the southeastern San Juan Mountains of Colorado, USA. Quaternary Research76(3): 352–362.
37.
JohnsonBGThackrayGDVan KirkR (2007) The effect of topography, latitude, and lithology on rock glacier distribution in the Lemhi Range, central Idaho, USA. Geomorphology91(1–2): 38–50.
38.
KilhamSSTheriotECFritzSC (1996) Linking planktonic diatoms and climate change in the large lakes of the Yellowstone ecosystem using resource theory. Limnology and Oceanography41: 1052–1062.
39.
KnellerMPeteetD (1999) Late-Glacial to early Holocene climate changes from a central Appalachian pollen and macrofossil record. Quaternary Research51(2): 133–147.
40.
LayzellALEppesMCJohnsonBG. (2012) Post-glacial range of variability in the Conejos River Valley, southern Colorado: Fluvial response to climate change and sediment supply. Earth Surface Processes and Landforms37: 1189–1202.
41.
LiYTörnqvistTENevittJM. (2012) Synchronizing a sea-level jump, final Lake Agassiz drainage, and abrupt cooling 8200 years ago. Earth and Planetary Science Letters315–316(0): 41–50.
42.
LipmanPWDunganMABrownLL. (1996) Recurrent eruption and subsidence at the Platoro caldera complex, southeastern San Juan volcanic field, Colorado: New tales from old tuffs. Geological Society America Bulletin108: 1039–1055.
43.
LipmanPWStevenTAMehnertHA (1970) Volcanic history of the San Juan Mountains, Colorado, as indicated by potassium-argon dating. Geological Society of America Bulletin81: 2329–2341.
44.
LiuZKutzbachJWuL (2000) Modeling climate shift of El Nino variability in the Holocene. Geophysical Research Letters27.
45.
LivingstoneDA (1955) A Lightweight Piston Sampler for Lake Deposits. Ecology36(1): 137–139.
46.
LotterAFBiglerC (2000) Do diatoms in the Swiss Alps reflect the length of ice-cover?Aquatic Sciences – Research Across Boundaries62: 125–141.
47.
LotterAFBirksHJBHofmannW. (1998) Modern diatom, cladocera, chironomid, and chrysophyte cyst assemblages as quantitative indicators from the reconstruction of past environmental conditions in the Alps. II. Nutrients. Journal of Paleolimnology19: 443–463.
48.
MarkgrafVScottL (1981) Lower timberline in central Colorado during the past 15,000 yr. Geology9: 231–243.
49.
MasonOKBowersPMHopkinsDM (2001) The early Holocene Milankovitch thermal maximum and humans: Adverse conditions for the Denali complex of eastern Beringia. Quaternary Science Reviews20(1–3): 525–548.
MenkingKMAndersonRY (2003) Contributions of La Nina and El Nino to middle Holocene drought and late Holocene moisture in the American Southwest. Geology31(11): 937–940.
53.
MenounosBKochJOsbornG. (2004) Early Holocene glacier advance, southern Coast Mountains, British Columbia, Canada. Quaternary Science Reviews23(14–15): 1543–1550.
54.
MillerCD (1973) Chronology of Neoglacial deposits in the northern Sawatch Range, Colorado. Arctic and Alpine Research5(4): 385–399.
55.
MoyCMSeltzerGORodbellDT. (2002) Variability of El Nino/Southern Oscillation activity at millennial timescales during the Holocene epoch. Nature420(6912): 162–165.
56.
NortonSAPerryRHSarosJE. (2011) The controls on phosphorus availability in a Boreal lake ecosystem since deglaciation. Journal of Paleolimnology46(1): 107–115.
57.
ReasonerMAHuberUM (1999) Postglacial palaeoenvironments of the upper Bow Valley, Banff National Park, Alberta, Canada. Quaternary Science Reviews18(3): 475–492.
58.
ReasonerMAJodryMA (2000) Rapid response of alpine timberline vegetation to the Younger Dryas climate oscillation in the Colorado Rocky Mountains, USA. Geology28(1): 51–54.
59.
RefsniderKABruggerKA (2007) Rock glaciers in central Colorado, U.S.A., as indicators of holocene climate change. Arctic, Antarctic, and Alpine Research39(1): 127–136.
60.
RodbellDTSeltzerGOAndersonDM. (1999) An ~15,000-year record of El Niño-driven alluviation in southwestern Ecuador. Science283(5401): 516–520.
61.
SarosJEMichelTJInterlandiSJ. (2005) Resource requirements of Asterionella formosa and Fragilaria crotonensis in oligotrophic alpine lakes: Implications for recent phytoplankton community reorganizations. Canadian Journal of Fisheries & Aquatic Sciences62(7): 1681–1689.
62.
SarosJEStoneJRPedersonGT. (2012) Climate-induces changes in lake ecosystem structure inferred from coupled neo- and paleo-ecological approaches. Ecology93: 2155–2164.
63.
SeppäHCwynarLCMacDonaldGM (2003) Post-glacial vegetation reconstruction and a possible 8200 cal. yr BP event from the low arctic of continental Nunavut, Canada. Journal of Quaternary Science18(7): 621–629.
64.
ShulmeisterJLeesBG (1995) Pollen evidence from tropical Australia for the onset of an ENSO-dominated climate at c. 4000 BP. The Holocene5(1): 10–18.
65.
ShumanBBartleinPLogarN. (2002) Parallel climate and vegetation responses to the early Holocene collapse of the Laurentide Ice Sheet. Quaternary Science Reviews21(16–17): 1793–1805.
66.
SmolJPStoermerEF (2010) The Diatoms: Applications for the Environmental and Earth Sciences. Cambridge: Cambridge University Press.
67.
StevenTALipmanPW (1976) Calderas of the San Juan volcanic field, southwestern Colorado. U.S. Geological Survey Professional Paper958: 35.
68.
ToneyJLAndersonRS (2006) A postglacial palaeoecological record from the San Juan Mountains of Colorado USA: Fire, climate and vegetation history. The Holocene16(4): 505–517.
69.
VierlingLA (1998) Palynological evidence for late- and postglacial environmental change in central Colorado. Quaternary Research49(2): 222–232.
70.
WeberWA (1976) Rocky Mountain Flora. Colorado Associated University Press.
71.
WolinJAStoneJR (2010) Diatoms as indicators of water-level change in freshwater lakes. In: SmolJPSteormerEG (eds) Diatoms: Applications for the Environmental and Earth Sciences. Cambridge: Cambridge University Press, 686 pp.
