Citations with the tag: PALEOCLIMATOLOGY

Results 1 - 50

• The arctic tree line as a record of past and recent climatic changes
  Lavoie, Claude; Payette, Serge // Environmental Reviews; 1994, Vol. 2 Issue 1, p78 

  No abstract available.

• Unlocking Secrets of the Ice.
  Dickinson, Rachel // Christian Science Monitor; 1/18/2000, Vol. 92 Issue 38, p22 

  Reports on paleoclimatologists who study ancient climates, including a drilling project in the West Antarctic Ice Sheet by the United States National Science Foundation to examine the Earth's ancient atmosphere.

• Foraminiferal evidences for 77-year cycles of droughts in India and its possible modulation by the Gleissberg solar cycle
  Khare, N.; Nair, R. R.; Nigam, R. // Journal of Coastal Research; Fall1995, Vol. 11 Issue 4, p1099 

  No abstract available.

• Astronomical forcing in cosmogenic Be-10 variation from east Antarctica coast?
  Liritzis, I.; Grigori, E. // Journal of Coastal Research; Summer1998, Vol. 14 Issue 3, p1065 

  Cosmogenic 10 Be concentrations in Antarctic ice (Vostok site), during the past 150 ka (1 ka = 1000 years) have been Spectrally analyzed. The current interest in beryllium refers on its use as a dating tool in lake, offshore/marine, and ice-core environments, and for palaeoclimate variation and...

• Cold answers to hot issues.
  Peel, David A. // Nature; 6/3/1993, Vol. 363 Issue 6428, p403 

  Asserts that rich archives of the Earth's climate have been kept in cold storage for more than 200,000 years in the ice sheets of Greenland and Antarctica. Results of two recently drilled deep ice cores; Detection of climate shifts over periods as short as a few years; Additional information.

• Paradox lost and paradox found.
  Kasting, J.F. // Nature; 2/20/1992, Vol. 355 Issue 6362, p676 

  Comments on how paleoclimate theory has come full circle in the past few years. Puzzle revealed by Sagan and Mullen twenty years ago regarding the Earth's climate history; The `faint young Sun' paradox; New climatic paradox posed by Crowley and Baum in connection with the late Ordovician...

• Low-latitude glacial cooling in the Southern Hemisphere from amino-acid racemization in emu eggshell
  Miller, Gifford H.; Magee, John W. // Nature; 1/16/1997, Vol. 385 Issue 6613, p241 

  Reconstructs low-altitude subtropical temperatures for the past 45,000 years. The use of temperature-dependent amino acid racemization reaction in radiocarbon-dated emu eggshell fragments; The fragments from the continental interior of Australia; The speculation of glacial-age reduction in...

• Flip-flop end to last ice age.
  Fairbanks, Richard G. // Nature; 4/8/1993, Vol. 362 Issue 6420, p495 

  Comments on a study by Richard Alley and co-workers published in the April 8, 1993 issue of `Nature' reporting ice-core evidence of a different, but equally profound nature to the record of atmospheric CO2 concentration spanning the past 200,000 years. Earlier claims that the Earth's climate...

• New prospects in old bubbles.
  Gregory, Karthryn M. // Nature; 12/1/1994, Vol. 372 Issue 6505, p407 

  Focuses on the implications of a method in paleoclimatology to estimate paleopressure from bubble sizes in basalt flows proposed by D.L. Sahagian and J.E. Maus. Paleoatmospheric pressures as clues to evolving elevation of landscapes; Two possible applications; Use in conjunction with foliar...

• Possible methane-induced polar warming in the early Eocene.
  Sloan, L.C.; Walker, J.C.G. // Nature; 5/28/1992, Vol. 357 Issue 6376, p321 

  Considers the estimates of Eocene wetland areas and suggests that the flux of methane, an important greenhouse gas, may have been substantially greater during Eocene than at present. Results of reconstructions of early Eocene climate; Production of methane by anaerobic bacteria; More.

• Ice-age tropics revisited.
  Anderson, David M.; Webb, Robert S. // Nature; 1/6/1994, Vol. 367 Issue 6458, p23 

  Discusses the problems associated with the simulation of climates during the last glacial period. Models using the sea surface temperatures derived by the Climate Long-range Investigation and Mapping program (CLIMAP) refusing to fit paleoclimate evidence of lowered snowlines and vegetation...

• Palaeolimnological evidence for marked Holocene environmental changes on Signy Island, Antarctica.
  Jones, V.J.; Hodgson, D.A.; Chepstow-Lusty, A. // Holocene; Jan2000, Vol. 10 Issue 1, p43 

  Lake-sediment cores from Heywood and Sombre Lakes on Signy Island (South Orkney Islands), Antarctica, have yielded a conformable radiocarbon chronology for the Holocene and a high-resolution record of environmental change. The lakes share a common climate and geology but have distinct...

• A Seasonally Forced Ocean-Atmosphere Model for Paleoclimate Studies.
  Schmittner, Andreas; Stocker, Thomas F. // Journal of Climate; 3/15/2001, Vol. 14 Issue 6, p1055 

  Seasonal forcing is applied to an idealized model of the ocean-atmosphere system by prescribing monthly values of solar insolation at the top of the atmosphere and wind stress at the ocean surface. In addition, meridional near-surface wind velocities are applied for the advection term in the...

• Phylogeography of Loxodontomys micropus with comments on the alpha taxonomy of Loxodontomys (Cricetidae: Sigmodontinae).
  CA��N, CAROLA; D'EL�A, GUILLERMO; PARDI�AS, ULYSES F. J.; LESSA, ENRIQUE P. // Journal of Mammalogy; Dec2010, Vol. 91 Issue 6, p1449 

  Loxodontomys micropus is a rodent that is widely distributed in Andean and Patagonian Argentina and Chile. This range covers a heterogeneous area that has been influenced by geologic and palaeoclimatic events, such as the glaciations during the Neogene. To investigate the genetic structure,...

• A kashiwa oak (Quercus dentata) tree-ring width chronology from northern coastal Hokkaido, Japan
  Jacoby, Gordon C.; Osawa, Akira; D'Arrigo, Rosanne D.; Lawrence, David M.; Wiles, Gregory C.; Yamaguchi, David K. // Canadian Journal of Forest Research; Apr1997, Vol. 27 Issue 4, p613 

  Few paleoclimatic records exist for Hokkaido, the northernmost, coldest and least environmentally disturbed of Japan's main islands. Here, we present a chronology for kashiwa oak (Quercus dentata Thunb.) atLake Saroma on the north central coast of Hokkaido. This record (1710--1993) was compared...

• Himalayan heat-up.
  Witze, Alexandra // Earth; Oct95, Vol. 4 Issue 5, p12 

  Proposes theories on the link between temperature changes and the uplifting of the Himalaya mountains sixty million years ago. Theory of organic carbon erosion; Theory of sedimentary rock erosion.

• Climate delivers a short, sharp shock.
  Hecht, Jeff // New Scientist; 3/13/93, Vol. 137 Issue 1864, p17 

  Focuses on research by scientists in the United States that found climate can change dramatically in just a few years. Evidence from ice core from Greenland; Findings from cores taken from the ocean floor; What the GISP-2 core reveals.

• What fish can hear about changing climate.
  Patterson, William P. // World & I; May93, Vol. 8 Issue 5, p187 

  Discusses the use of fish otoliths the study of past climate. Techniques used to estimate the climate of the past; Isotopic composition; Ancient temperatures stored in fossil otoliths of fish; Use of specialized kinds of fish in large lakes of temperate regions; Problems encountered; Use of...

• Empires in the dust.
  Wright, Karen // Discover; Mar98, Vol. 19 Issue 3, p94 

  Examines the environmental causes of the collapse of Bronze Age civilizations. Yale professor Harvey Weiss' paleoclimatological findings; Climate changes in Mesopotamia; Effects of drought on civilizations; Stability of climate preceding the Holocene; Evidences of climate associated calamities.

• Last Glacial snowlines in the Tibetan Plateau: an argument against an extensive coalescing icesheet
  Feng, Z.-D. // GeoJournal; Oct1997, Vol. 43 Issue 2, p355 

  Two opposing theories are circulating with regard to the extent of the Last Glacial ice cover in the Tibetan Plateau. One says that only less than 20% of plateau was covered with ice, and another insists that the plateau be completely covered with an extensive coalescing icesheet. The extent of...

• Vegetation and Climate of the New Siberian Islands for the Past 15,000 Years.
  Makeyev, V. M.; Ponomareva, D. P.; Pitulko, V. V.; Chernova, G. M.; Solovyeva, D. V. // Arctic, Antarctic & Alpine Research; Feb2003, Vol. 35 Issue 1, p56 

  Presents paleobotanical and paleoclimatic reconstructions of the New Siberian Islands based on data from Quaternary geology and archaeology collected in the late 1980s and early 1990s as part of research conducted by the Arctic and Antarctic Research Institute in Russia. Pollen record for...

• Evidence for late Holocene tsunamis at Catala Lake, British Columbia
  Mathewes, R. W.; Hutchinson, I.; Clague, John J.; Patterson, R. T. // Journal of Coastal Research; Winter1999, Vol. 15 Issue 1, p45 

  Thin sheets of sand and gravel occur within a sequence of fine organic-rich sediments at Catala Lake, off the wes coast of Vancouver Island, British Columbia. The uppermost of these coarse sheets thins and fines landward away from the lake outlet, consistent with deposition by a tsunami. This...

• Contributions of fine-particle magnetism to reading the global paleoclimate record (invited).
  Banerjee, Subir K. // Journal of Applied Physics; 5/15/1994, Vol. 75 Issue 10, p5925 

  Discusses paleoclimate changes that are recorded by proxy as variations in concentration, composition and grain size of magnetic minerals, principally magnetite in the sediments deposited in lakes, oceans and continental eolian deposits. Discussion on popular rock magnetic parameters for sample...

• High-resolution terrestrial record of orbital climate forcing in coal.
  Large, D.J.; Jones, T.F.; Somerfield, C.; Gorringe, M.C.; Spiro, B.; Macquaker, J.H.S.; Atkin, B.P. // Geology; Apr2003, Vol. 31 Issue 4, p303 

  Pre-Quaternary terrestrial climate records in which time has been calibrated using astronomical cycles are, with the exception of lacustrine proxies, poorly represented in the geological record. This omission is a significant gap in our knowledge of ancient climate systems. Here we present new...

• Oligocene-Miocene age of aridity in the Atacama Desert revealed by exposure dating or erosion-sensitive landforms.
  Dunai, Tibor J.; Gonz�lez L�pez, Gabriel A.; Juez-Larr�, Joaquin // Geology; Apr2005, Vol. 33 Issue 4, p321 

  The age of onset of hyperaridity in the Atacama Desert, Chile, which is needed to validate geological and climatological concepts, has been heretofore uncertain. Measurement of cosmogenic 21Ne in clasts from erosion-sensitive sediment surfaces in northern Chile shows that these surfaces have...

• Bi-polar ocean linkages: evidence from late-Holocene Antarctic marine and Greenland ice-core records.
  Domack, E.W; Mayewski, P.A // Holocene; Mar1999, Vol. 9 Issue 2, p247 

  A continuous, 14 C dated palaeoenvironmental (4000-year) proxy from the Antarctic Peninsula glacial marine record demonstrates pronounced cycles of elevated palaeoproductivity (warm events) that recur every | 200 years. Superimposed upon this are longer-term reductions in palaeoproductivity...

• Explosive start to last ice age.
  Ramaswamy, V. // Nature; 9/3/1992, Vol. 359 Issue 6390, p14 

  Focuses on an article by Rampino and Self in the September 3, 1992 issue of `Nature' that suggests that the massive volcanic eruption at Toba, in the Indian Ocean, 73,500 years ago, may have accelerated the onset of the last ice age by loading the stratosphere with aerosols and shadowing the...

• Erratum: Making sense of palaeoclimate sensitivity.
  Members, PALAEOSENS Project // Nature; 2/7/2013, Vol. 494 Issue 7435, p130 

  A correction to the article "Making sense of palaeoclimate sensitivity" that was published in a previous issue.

• Ice core evidence for secular variability and 200-year dipolar oscillations in atmospheric circulation over East Antarctica during the Holocene.
  Delmonte, Barbara; Petit, Jean Robert; Krinner, Gerhard; Maggi, Valter; Jouzel, Jean; Udisti, Roberto // Climate Dynamics; May2005, Vol. 24 Issue 6, p641 

  Two Holocene ice core records from East Antarctica (Vostok and EPICA-Dome C) were analysed for dust concentration and size distribution at a temporal resolution of 1 sample per ~50 years. A series of volcanic markers randomly distributed over the common part of the ice cores (from 9.8 to 3.5...

• Lake Tutira, North Island, New Zealand.
  Delmonte, Barbara; Petit, Jean Robert; Krinner, Gerhard; Maggi, Valter; Jouzel, Jean; Udisti, Roberto // CO2 Science; 12/30/2009, Vol. 12 Issue 51, p8 

  The article discusses research on the paleoclimatic effects of a storm erosion record from late Holocene lake sediments in North Island, New Zealand. It references a study by D. N. Eden and M. J. Page, published in a 1998 issue of the journal "Paleogeography, Palaeoclimatoloy, Palaeocology."...

• The Glaciers of Greenland.
  Delmonte, Barbara; Petit, Jean Robert; Krinner, Gerhard; Maggi, Valter; Jouzel, Jean; Udisti, Roberto // CO2 Science; 1/6/2010, Vol. 13 Issue 1, p5 

  The article presents a summary of research covering the fluctuations of local glaciers in Greenland during latest Pleistocene and Holocene time. They found that subsequent to late-glacial or early Holocene time, most local glaciers were smaller than at present or they may have disappeared...

• Barbed Bone Points: Tradition and Continuity in Saharan and Sub-Saharan Africa.
  Yellen, John E. // African Archaeological Review; Sep1998, Vol. 15 Issue 3, p173 

  Examination of African barbed bone points recovered from Holocene sites provides a context to interpret three Late Pleistocene occurrences from Katanda and Ishango, Zaire, and White Paintings Shelter, Botswana. In sites dated to ca. 10,000 BP and younger, such artifacts are found widely...

• Holocene Climatic Changes and Cultural Dynamics in the Libyan Sahara.
  Cremaschi, M.; Di Lernia, S. // African Archaeological Review; Dec1999, Vol. 16 Issue 4, p211 

  Systematic surveys and excavations were carried out during the 1990�1996 field seasons in the Tadrart Acacus and surrounding areas, shedding new light on the climatic changes and cultural dynamics which occurred during the Holocene. In this paper, the geological, geomorphological, and...

• Early and late Holocene water-level fluctuations of Lake Annecy, France: sediment and pollen evidence and climatic implications.
  Magny, Michel; Marguet, André; Chassepot, Gilles; Richard, Hervé; Billaud, Yves // Journal of Paleolimnology; Feb2001, Vol. 25 Issue 2, p215 

  Early and late Holocene water-level changes in Lake Annecy, France, were reconstructed from a sediment sequence from Annecy. Two early Holocene successive rises in lake level at ca. 8900-8700 BP are recorded. Another increase in lake level, beginning at ca. 780 BP, is documented. The higher...

• Holocene palynology: I principles, population and community ecology,palaeoclimatology
  MacDonald, Glen M.; Edwards, Kevin J. // Progress in Physical Geography; Sep1991, Vol. 15 Issue 3, p261 

  No abstract available.

• High-resolution palaeoclimatic records for the last millennium: interpretation, integration and comparison with General Circulation Model control-run temperatures.
  Jones, P.D.; Briffa, K.R.; Barnett, T.P.; Tett, S.F.B. // Holocene; Jul98, Vol. 8 Issue 4, p455 

  Palaeoclimatology provides our only means of assessing climatic variations before the beginning of instrumental records. The various proxy variables used, however, have a number of limitations which must be adequately addressed and understood. Besides their obvious spatial and seasonal...

• A 3000-year high-resolution stalagmite-based record of palaeoclimate for northeastern South Africa.
  Holmgren, K.; Karl�n, W.; Svanered, O.; Lauritzen, S.E.; Lee-Thorp, J.A.; Partridge, T.C.; Piketh, S.; Tyson, P.D. // Holocene; May99, Vol. 9 Issue 3, p295 

  High-resolution stable isotope variations and growth structure analyses of the last three millennia of a 6600-year stalagmite record at Cold Air Cave, Makapansgat Valley, South Africa, are presented. Growth layers, which are measurable over the last 250 years, are shown to be annual. The...

• Recent warming in a 500-year palaeotemperature record from varved sediments, Upper Soper Lake, Baffin Island, Canada.
  Hughen, K.A.; Overpeck, J.T.; Anderson, R.F. // Holocene; Jan2000, Vol. 10 Issue 1, p9 

  . Laminated sediments from Upper Soper Lake on southern Baffin Island provide a new 500-year record of temperature change in the Arctic. Radiometric dating, using 210 Pb and Pu, shows that the light- and dark-coloured laminae couplets are annually deposited varves. Dark laminae thickness is...

• Mire-development pathways and palaeoclimatic records from a full Holocene peat archive at Walton Moss, Cumbria, England.
  Hughes, P.D.M.; Barber, K.E.; Langdon, P.G.; Mauquoy, D. // Holocene; Jul2000, Vol. 10 Issue 4, p465 

  Plant macrofossil data have been used to identify the successive mire communities occupying both central and marginal locations in the Walton Moss peatland complex, during the last 10 500 years. The reconstructed pathways of mire development indicate that early-Holocene fen and fen-carr...

• Climatic change in Chile at around 2700 BP and global evidence for solar forcing: a hypothesis.
  van Geel, B.; Heusser, C.J.; Renssen, H.; Schuurmans, C.J.E. // Holocene; Sep2000, Vol. 10 Issue 5, p659 

  Palaeoecological and geological evidence for changing atmospheric circulation patterns in Chile indicates that equatorward and poleward shifts of the Southern Westerlies (Pacific precipitation source) were an important factor during Weichselian and Holocene climate change. We focus on the...

• Postglacial water-level changes of a small lake in southern Qu�bec, Canada.
  Lavoie, M.; Richard, P.J.H. // Holocene; Sep2000, Vol. 10 Issue 5, p621 

  Sediment stratigraphy and palaeobotanical data from five cores were used to reconstruct the postglacial water-level changes of a small lake in southern Qu�bec. The cores were taken along two transects from the centre of the lake to the margins. Lake level was relatively high before 11 000 cal....

• Multi-proxy Holocene palaeoclimatic record from a saline lake in the Canadian Subarctic.
  Pienitz, R.; Smol, J.P.; Last, W.M.; Leavitt, P.R.; Cumming, B.F. // Holocene; Nov2000, Vol. 10 Issue 6, p673 

  Multi-proxy palaeolimnological analyses of a postglacial sedimentary sequence at a centennial-scale resolution from an athalassic saline lake in the Yukon were conducted to infer patterns of Holocene climatic change in the Canadian Subarctic, using sediment mineralogy and biostratigraphy...

• Monogolian tree-rings, temperature sensitivity and reconstructions of Northern Hemisphere temperature.
  D'Arrigo, R.; Jacoby, G.; Pederson, N.; Frank, D.; Buckley, B.; Nachin, B.; Mijiddorj, R.; Dugarjav, C. // Holocene; Nov2000, Vol. 10 Issue 6, p669 

  Much of northern Asia is lacking in high-resolution palaeoclimatic data coverage. This vast region thus represents a sizeable gap in data sets used to reconstruct hemispheric-scale temperature trends for the past millennium. To improve coverage, we present a regional-scale composite of four...

• Palaeohydrological records derived from testate amoebae analysis from peatlands in northern England: within-site variability, between-site comparability and palaeoclimatic implications.
  Hendon, D.; Charman, D.J.; Kent, M. // Holocene; Mar2001, Vol. 11 Issue 2, p127 

  Testate amoebae analysis was undertaken on eight cores from three mires within a restricted geographical area of northern England. This was used to assess, first, the amount of autogenically produced variability in palaeohydrological records from ombrotrophic mires, and, second, to determine...

• The Alps with little ice: evidence for eight Holocene phases of reduced glacier extent in the Central Swiss Alps.
  Hormes, A.; M�ller, B.U.; Schl�chter, C. // Holocene; May2001, Vol. 11 Issue 3, p255 

  Glacially deformed pieces of wood, organic lake sediments and clasts of reworked peat have been collected in front of Alpine glaciers since ad 1990. The palaeoglaciological interpretation of these organic materials is related to earlier phases of glacier recession surpassing that of today�s...

• Mediaeval climatic warming recorded by radiocarbon dated alpine tree-line shift on the Kola Peninsula, Russia.
  Hiller, A.; Boettger, T.; Kremenetski, C. // Holocene; Jul2001, Vol. 11 Issue 4, p491 

  Studies of the tree-line history in northern Fennoscandia provide useful evidence about the Holocene environment and the region�s climatic history. Here we report on late-Holocene alpine tree-line movement in the Khibiny low mountains on the Kola Peninsula, northwestern Russia. A highly...

• Holocene land degradation and climatic change in northeastern Iceland.
  �lafsd�ttir, Rannveig; Gu�mundsson, Hjalti J. // Holocene; Mar2002, Vol. 12 Issue 2, p159 

  The spatial and temporal pattern of land degradation in northeastern Iceland during the Holocene is analysed in relation to climatic fluctuations. Tephrochronology is used to date the inferred terrestrial changes, and remote sensing and geographical information systems to assess the dynamic...

• Holocene vegetation history from the Salym-Yugan Mire Area, West Siberia.
  Pitk�nen, A.; Turunen, J.; Tahvanainen, T.; Tolonen, K. // Holocene; May2002, Vol. 12 Issue 3, p353 

  The pollen stratigraphy of an ombrotrophic patterned ridge-hollow raised bog in the Salym-Yugan Mire Area in boreal West Siberia (60�10'N, 72�50'E) covers the entire Holocene period. Pollen data from three parallel peat cores suggest that, contrary to previous assumptions, Betula forests did...

• The 'Mediaeval Warm Period' drought recorded in Lake Huguangyan, tropical South China.
  Chu, Guoqiang; Liu, Jiaqi; Sun, Qing; Lu, Houyuan; Gu, Zhaoyan; Wang, Wenyuan; Liu, Tungsheng // Holocene; Sep2002, Vol. 12 Issue 5, p511 

  The geochemistry of dated sediment cores from Lake Huguangyan (21�9'N, 110�17'E), tropical South China, reveals distinct stratigraphical patterns in total organic and inorganic carbon (TOC, TIC), biogenic silica (BS) and total nitrogen (TN) over the past 1400 years. In this hydrologically...

• A 400-year tree-ring chronology in northern Swedish Lapland: natural climatic variability expressed on annual to millennial timescales.
  Grudd, Hakan; Briffa, Keith R.; Karlen, Wibjorn; Bartholin, Thomas S.; Jones, Philip D.; Kromer, Bernd // Holocene; Nov2002, Vol. 12 Issue 6, p657 

  Tree-ring widths from 880 living, dry dead, and subfossil northern Swedish pines (Pinus sylvestris L.) have been assembled into a continuous and precisely dated chronology (the Tornetr�sk chronology) covering the period 5407 BC to AD 1997. Biological trends in the data were removed with...

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