Early-Holocene warming in Beringia and its mediation by sea-level and vegetation changes

Climate of the Past

Volumn 11, Issue 9, 2015, Pages 1197-1222

  Bartlein, P J ^a   Edwards, M E ^b,c   Hostetler, S W ^d   Shafer, S L ^d   Anderson, P M ^e   Brubaker, L B ^e   Lozhkin, A V ^f  

^a UNIVERSITY OF OREGON   (United States)

^b UNIVERSITY OF SOUTHAMPTON   (United Kingdom)

^c UNIVERSITY OF ALASKA FAIRBANKS   (United States)

^d U S GEOLOGICAL SURVEY   (United States)

^e UNIVERSITY OF WASHINGTON   (United States)

^f Russian Academy of Sciences   (Russian Federation)

Author keywords

[No Author keywords available]

Indexed keywords

BOUNDARY CONDITION; CLIMATE MODELING; CLIMATE VARIATION; DECIDUOUS FOREST; FEEDBACK MECHANISM; GENERAL CIRCULATION MODEL; GLOBAL WARMING; GROWING SEASON; HOLOCENE; ICE COVER; NORTHERN HEMISPHERE; PALEOECOLOGY; PERMAFROST; SEA LEVEL CHANGE; VEGETATION STRUCTURE;

ALASKA; CANADA; SIBERIA; UNITED STATES;

EID: 84942609661     PISSN: 18149324     EISSN: 18149332     Source Type: Journal    
DOI: 10.5194/cp-11-1197-2015     Document Type: Article

References (103)

1. Abbott, M. B.; Finney, B. P.; Edwards, M. E.; and Kelts, K. R.: Lakelevel reconstructions and paleohydrology of Birch Lake, central Alaska, based on seismic reflection profiles and core transects, Quaternary Res.; 53, 154-166, 2000.
2. Abbott, M. B.; Edwards, M. E.; and Finney, B. P.: A 40 000-yr record of environmental change from Burial Lake in Northwest Alaska, Quaternary Res.; 74, 156-165, 2010.
3. ACIA: Impact of a Warming Arctic: Arctic Climate Impact Assessment, Cambridge University Press, Cambridge, 1020 pp.; 2004.
4. Ager, T. A.: Late Quaternary vegetation and climate history of the central Bering land bridge from St. Michael Island, western Alaska, Quaternary Res.; 60, 19-32, 2003.
5. Ager, T. A. and Phillips, R. L.: Pollen evidence for Late Pleistocene Bering land bridge environments from Norton Sound, Northeastern Bering Sea, Alaska, Arct. Antarct. Alp. Res.; 40, 451-461, 2008.
6. Alder, J. R. and Hostetler, S. W.: Global climate simulations at 3000-year intervals for the last 21 000 years with the GENMOM coupled atmosphere-ocean model, Clim. Past, 11, 449- 471, doi:10.5194/cp-11-449-2015, 2015.
7. Anderson, L.; Abbott, M. B.; Finney, B. P.; and Edwards, M. E.: Palaeohydrology of the Southwest Yukon Territory, Canada, based on multiproxy analyses of lake sediment cores from a depth transect, Holocene, 15, 1172-1183, 2005.
8. Anderson, P. M.; Edwards, M. E.; and Brubaker, L. B.: Results and paleoclimate implications of 35 years of paleoecological research in Alaska, in: The Quaternary Period in the United States, Developments in Quaternary Science, edited by: Gillespie, A. E.; Porter, S. C.; and Atwater, B. F.; Elsevier, New York, 427-440, 2004.
9. Barber, V. A. and Finney, B. P.: Late Quaternary paleoclimatic reconstructions for interior Alaska based on paleolake-level data and hydrologic models, J. Paleolimnol.; 24, 29-41, 2000.
10. Barber, V. A.; Juday, G. P.; and Finney, B. P.: Reduced growth in Alaskan white spruce from 20th century temperature-induced drought stress, Nature, 405, 668-673, 2000.
11. Bartlein, P. J.; Anderson, P. M.; Edwards, M. E.; and McDowell, P. M.: A framework for interpreting paleoclimatic variations in eastern Beringia, Quatern. Int.; 10-12, 73-83, 1991.
12. Bartlein, P. J.; Hostetler, S. W.; and Alder, J. R.: Paleoclimate, in: Climate Change in North America, Regional Climate Studies, edited by: Ohring, G.; Springer, 1-51, doi:10.1007/978-3-319- 03768-4-1, 2014.
13. Berger, A. L.: Long-term variations of daily insolation and Quaternary climatic changes, J. Atmos. Sci.; 35, 2362-2367, 1978.
14. Bigelow, N. H.; Brubaker, L. B.; Edwards, M. E.; Harrison, S. P.; Prentice, I. C.; Anderson, P. M.; Andreev, A. A.; Bartlein, P. J.; Christensen, T. R.; Cramer, W.; Kaplan, J. O.; Lozhkin, A. V.; Matveyeva, N. V.; Murray, D. F.; McGuire, A. D.; Razzhivin, V. Y.; Ritchie, J. C.; Smith, B.; Walker, D. A.; Gajewski, K.;Wolf, V.; Holmqvist, B. H.; Igarashi, Y.; Kremenetskii, K.; Paus, A.; Pisaric, M. F. J.; and Volkova, V. S.: Climate change and Arctic ecosystems: 1. Vegetation changes north of 55- N between the last glacial maximum, mid-Holocene, and present, J. Geophys. Res.; 108, 8170, doi:10.1029/2002JD002558, 2003.
15. Binney, H. A.;Willis, K. J.; Edwards, M. E.; Bhagwat, S. A.; Anderson, P. M.; Andreev, A. A.; Blaauw, M.; Damblon, F.; Haesaerts, P.; Kienast, F.; Kremenetski, C. V.; Krivonogov, S. K.; Lozhkin, A. V.; MacDonald, G. M.; Novenko, E. Y.; Oksanen, P.; Sapelko, T. V.; Valiranta, M.; and Vazhenina, L.: The distribution of late- Quaternary woody taxa in northern Eurasia: evidence from a new macrofossil database, Quaternary Sci. Rev.; 8, 2445-2464, 2009.
16. Bonan, G. B.; Chapin III, F. S.; and Thompson, S. L.: Boreal forest and tundra ecosystems as components of the climate system, Climatic Change, 29, 145-167, 1995.
17. Bonfils, C. J. W.; Phillips, T. J.; Lawrence, D. M.; Cameron-Smith, P.; Riley,W. J.; and Subin, Z. M.: On the influence of shrub height and expansion on northern high latitude climate, Environ. Res. Lett.; 7, 015503, doi:10.1088/1748-9326/7/1/015503, 2012.
18. Burn, C. R.: Cryostratigraphy, paleogeography, and climate change during the early Holocene warm interval, western Arctic coast, Canada, Can. J. Earth Sci.; 34, 912-925, 1997.
19. Chapin III, F. S. and Starfield, A. M.: Time lags and novel ecosystems in response to transient climatic change in Arctic Alaska, Climatic Change, 35, 449-461, 1997.
20. Chapin III, F. S.; Sturm, M.; Serreze, M. C.; McFadden, J. P.; Key, J. R.; Lloyd, A. H.; McGuire, A. D.; Rupp, T. S.; Lynch, A. H.; Schimel, J. P.; Beringer, J.; Chapman, W. L.; Epstein, H. E.; Euskirchen, E. S.; Hinzman, L. D.; Jia, G.; Ping, C.-L.; Tape, K. D.; Thompson, C. D. C.; Walker, D. A.; and Welker. J. M.: Role of land-surface changes in Arctic summer warming, Science, 310, 657-660, 2005.
21. Chase, T. N.; Pielke, R. A.; Kittel, T. G. F.; Nemani, R.; and Running, S. W.: Sensitivity of a general circulation model to global changes in leaf area index, J. Geophys. Res.-Atmos.; 101, 7393-7408, doi:10.1029/95JD02417, 1996.
22. Collins, M.; Knutti, R.; Arblaster, J.; Dufresne, J.-L.; Fichefet, T.; Friedlingstein, P.; Gao, X.; Gutowski, W. J.; Johns, T.; Krinner, G.; Shongwe, M.; Tebaldi, C.; Weaver, A. J.; and Wehner, M.: Long-term climate change: projections, commitments and irreversibility, in: Climate Change 2013: The Physical Science Basis. Contribution ofWorking Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Stocker, T. F.; Qin, D.; Plattner, G.-K.; Tignor, M.; Allen, S. K.; Boschung, J.; Nauels, A.; Xia, Y.; Bex, V.; and Midgley, P. M.; Cambridge University Press, Cambridge, UK, 1032 pp.; 2013.
23. Dorman, J. L. and Sellers, P. J.: A global climatology of albedo, roughness length, and stomatal resistance for atmospheric general circulation models as represented by the simple biosphere model (SiB), J. Appl. Meteorol.; 28, 833-855, 1989.
24. Dyke, A. S.; Moore, A.; and Robertson, L.: Deglaciation of North America, Geological Survey of Canada, Open File 1574, 2003.
25. Edwards, M. E.; Anderson, P. M.; Brubaker, L. B.; Ager, T.; Andreev, A. A.; Bigelow, N. H.; Cwynar, L. C.; Eisner,W. R.; Harrison, S. P.; Hu, F.-S.; Jolly, D.; Lozhkin, A. V.; MacDonald, G. M.; Mock, C. J.; Ritchie, J. C.; Sher, A. V.; Spear, R.W.;Williams, J.; and Yu, G.: Pollen-based biomes for Beringia 18 000, 6000 and 0 14C yr BP, J. Biogeogr.; 27, 521-554, 2000a.
26. Edwards, M. E.; Bigelow, N. H.; Finney, B. P.; and Eisner, W. R.: Records of aquatic pollen and sediment properties as indicators of late-Quaternary Alaskan lake levels, J. Paleolimnol.; 24, 55-68, 2000b.
27. Edwards, M. E.; Mock, C. J.; Finney, B. P.; Barber, V. A.; and Bartlein, P. J.: Modern-climate analogues for paleoclimatic variations in eastern interior Alaska during the past 14 000 years: atmospheric-circulation controls of regional temperature and moisture responses, Quaternary Sci. Rev.; 20, 189-202, 2001.
28. Edwards, M. E.; Brubaker, L. B.; Lozhkin, A. V.; and Anderson, P. M.: Structurally novel biomes: a response to past warming in Beringia, Ecology, 86, 1696-1703, 2005.
29. Elias, S. A. and Brigham-Grette, J.: Late Pleistocene events in Beringia, in: Encyclopedia of Quaternary Science, 1057-1066, 2007.
30. Elias, S. A.; Short, S. K.; and Birks, H. H.: LateWisconsin environments of the Bering Land Bridge, Palaeogeogr. Palaeocl.; 136, 293-308, 1997.
31. Fairbanks, R. G.: A 17 000-year glacio-eustatic sea-level record - influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation, Nature, 342, 637-642, 1989.
32. Finney, B. P.; Bigelow, N. H.; Barber, V. A.; and Edwards, M. E.: Holocene climate change and carbon cycling in a groundwaterfed, boreal forest lake: Dune Lake, Alaska, J. Paleolimnol.; 48, 43-54, 2012.
33. Foley, J. A.; Kutzbach, J. E.; Coe, M. T.; and Levis, S.: Feedbacks between climate and boreal forests during the Holocene, Nature, 371, 52-54, doi:10.1038/371052a0, 1994.
34. Forbes, B. C.; Fauria, M. M.; and Zetterberg, P.: Russian Arctic warming and greening are closely tracked by tundra shrub willows, Glob. Change Biol.; 16, 1542-1554, 2010.
35. Giorgi, F.; Marinucci, M. R.; and Bates, G. T.: Development of a second-generation regional climate model (RegCM2), Part I: Boundary-layer and radiative transfer processes, Mon.Weath. Rev.; 121, 2794-2813, 1993a.
36. Giorgi, F.; Marinucci, M. R.; and Bates, G. T.: Development of a second-generation regional climate model (RegCM2), Part II: Convective processes and assimilation of lateral boundary conditions, Mon. Weath. Rev.; 121, 2814-2832, 1993b.
37. Harvey, L. D. D.: On the role of high latitude ice, snow and vegetation feedbacks in the climatic response to external forcing changes, Climatic Change, 13, 191-224, 1988.
38. Hill, P. R. and Solomon, S.: Geomorphologic and sedimentary evolution of a transgressive thermokarst coast, Mackenzie delta region, Canadian Beaufort Sea, J. Coastal Res.; 15, 1011-1029, 1999.
39. Hopkins, D. M.: Thaw lakes and thaw sinks in the Imuruk Lake Area, Seward Peninsula, Alaska, J. Geol.; 57, 119-131, 1949.
40. Hopkins, D. M.: Aspects of the paleogeography of Beringia during the late Pleistocene, in: Paleoecology of Beringia, edited by: Hopkins, D. M.; Matthews, J. J. V.; Schweger, C. E.; and Young, S. B.; Academic Press, New York, 127-150, 1982.
41. Hostetler, S. W. and Bartlein, P. J.: Simulation of lake evaporation with application to modeling lake level variations of Harney- Malheur Lake, Oregon, Water Resour. Res.; 26, 2603-2612, 1990.
42. Hostetler, S.W. and Bartlein, P. J.: Response of regional climate and surface processes inWestern North America to a canonical Heinrich event, in: Mechanism of Global Climate Change at Millennial Time Scales, edited by: Clark, P. U.; Webb, R. S.; and Keig win, L.; AGU Monograph Series, American Geophysical Union, Washington, DC, 313-328, 1999.
43. Hostetler, S. W.; Giorgi, F.; Bates, G. T.; and Bartlein, P. J.: Lake- atmosphere feedbacks associated with paleolakes Bonneville and Lahontan, Science, 263, 665-668, 1994.
44. Hostetler, S. W.; Bartlein, P. J.; Clark, P. U.; Small, E. E.; and Solomon, A. M.: Simulated influences of Lake Agassiz on the climate of central North America 11 000 years ago, Nature, 405, 334-337, 2000.
45. Jones, M. C. and Yu, Z.: Rapid deglacial and early Holocene expansion of peatlands in Alaska, P. Natl. Acad. Sci. USA, 107, 7347-7352, 2010.
46. Joussaume, S.; Taylor, K. E.; Braconnot, P.; Mitchell, J.; Kutzbach, J. E.; Harrison, S. P.; Prentice, I. C.; Broccoli, A. J.; Abe-Ouchi, A.; Bartlein, P. J.; Bonfils, C.; Dong, B.; Guiot, J.; Herterich, K.; Hewitt, C. D.; Jolly, D.; Kim, J.W.; Kislov, A.; Kitoh, A.; Loutre, M. F.; Masson, V.; McAvaney, B.; McFarlane, N.; de Noblet, N.; Peltier, W. R.; Peterschmitt, J. Y.; Pollard, D.; Rind, D.; Royer, J. F.; Schlesinger, M. E.; Syktus, J.; Thompson, S. L.; Valdes, P.; Vettoretti, G.; Webb, R. S.; and Wyputta, U.: Monsoon changes for 6000 years ago: results of 18 simulations from the Paleoclimate Modeling Intercomparison Project (PMIP), Geophys. Res. Lett.; 26, 859-862, 1999.
47. Kaufman, D. S.; Ager, T. A.; Anderson, N. J.; Anderson, P. M.; Andrews, J. T.; Bartlein, P. J.; Brubaker, L. B.; Coats, L. L.; Cwynar, L. C.; Duvall, M. L.; Dyke, A. S.; Edwards, M. E.; Eisner, W. R.; Gajewski, K.; Geirsdóttir, A.; Hu, F. S.; Jennings, A. E.; Kaplan, M. R.; Kerwin, M. W.; Lozhkin, A. V.; MacDonald, G. M.; Miller, G. H.; Mock, C. J.; Oswald, W. W.; Otto-Bliesner, B. L.; Porinchu, D. F.; Ruhland, K.; Smol, J. P.; Steig, E. J.; and Wolfe, B. B.: Holocene thermal maximum in the western Arctic (0-180- W), Quaternary Sci. Rev.; 23, 529-560, 2004.
48. Keigwin, L. D.; Donnelly, J. P.; Cook, M. S.; Driscoll, N. W.; and Brigham-Grette, J.: Rapid sea-level rise and Holocene climate in the Chukchi Sea, Geology, 34, 861-864, 2006.
49. Kokorowski, H. D.; Anderson, P. M.; Mock, C. J.; and Lozhkin, A. V.: A re-evaluation and spatial analysis of evidence for a Younger Dryas climatic reversal in Beringia, Quaternary Sci. Rev.; 27, 1710-1722, 2008.
50. Kutzbach, J. E. and Gallimore, R. G.: Sensitivity of a coupled atmosphere mixed layer ocean model to changes in orbital forcing at 9000 years BP, J. Geophys. Res.-Atmos.; 93, 803-821, 1988.
51. Liess, S.; Snyder, P. K.; and Harding, K. J.: The effects of boreal forest expansion on the summer Arctic frontal zone, Clim. Dynam.; 38, 1805-1827, doi:10.1007/s00382-011-1064-7, 2012.
52. Lozhkin, A. V.; Anderson, P. M.; Eisner,W. R.; Ravako, L. G.; Hopkins, D. M.; Brubaker, L. B.; Colinvaux, P. A.; and Miller, M. C.: Late Quaternary lacustrine pollen records from southwestern Beringia, Quaternary Res.; 39, 314-324, 1993.
53. Lozhkin, A. V.; Anderson, P.; Eisner,W. R.; and Solomatkina, T. B.: Late glacial and Holocene landscapes of central Beringia, Quaternary Res.; 76, 383-392, 2011.
54. Lynch, A. H.; Bonan, G. B.; Chapin III, F. S.; and Wu, W.: Impact of tundra ecosystems on the surface energy budget and climate of Alaska, J. Geophys. Res.-Atmos.; 104, 6647-6660, 1999.
55. Lynch, A. H.; Slater, A. G.; and Serreze, M.: The Alaskan Arctic frontal zone: forcing by orography, coastal contrast, and the boreal forest, J. Climate, 14, 4351-4362, 2001.
56. Lynch, A. H.; Rivers, A. R.; and Bartlein, P. J.: An assessment of the influence of land cover uncertainties on the simulation of global climate in the early Holocene, Clim. Dynam.; 21, 243-256, 2003.
57. MacDonald, G. M.; Beilman, D. W.; Kremenetski, K. V.; Sheng, Y.; Smith, L. C.; and Velichko, A. A.: Rapid early development of circumarctic peatlands and atmospheric CH4 and CO2 variations, Science, 214, 385-388, 2006.
58. Manley, W. F.: Postglacial Flooding of the Bering Land Bridge: a Geospatial Animation: INSTAAR, University of Colorado, v1, available at: http://instaar.colorado.edu/QGISL/bering-land-bridge (last access: 12 May 2014), 2002.
59. Mann, D. H.; Reanier, R. E.; Peteet, D. M.; Kunz, M. L.; and Johnson, M.: Environmental change and Arctic Paleoindians, Arctic Anthropol.; 38, 119-138, 2001.
60. McGuire, A. D.; Ruess, R. W.; Lloyd, A.; Yarie, J.; Clein, J. S.; and Juday, G. P.: Vulnerability of white spruce tree growth in interior Alaska in response to climate variability: dendrochronological, demographic, and experimental perspectives, Can. J. Forest Res.; 40, 1197-1209, 2010.
61. Mearns, L. O.; Arritt, R.; Biner, S.; Bukovsky, M. S.; McGinnis, S.; Sain, S.; Caya, D.; Correia, J.; Flory, D.; Gutowski, W.; Takle, E. S.; Jones, R.; Leung, R.; Moufouma-Okia, W.; McDaniel, L.; Nunes, A. M. B.; Qian, Y.; Roads, J.; Sloan, L.; and Snyder, M.: The North American regional climate change assessment program: overview of phase I results, B. Am. Meteorol. Soc.; 93, 1337-1362, 2012.
62. Miller, G. H.; Brigham-Grette, J.; Alley, R. B.; Anderson, L.; Bauch, H. A.; Douglas, M. S. V.; Edwards, M. E.; Elias, S. A.; Finney, B. P.; Fitzpatrick, J. J.; Funder, S. V.; Herbert, T. D.; Hinzman, L. D.; Kaufmann, D. S.; MacDonald, G. M.; Polyak, L.; Robock, A.; Serreze, M. C.; Smol, J. P.; Spielhagen, R.; White, J. W. C. Wolfe, A. P.; and Wolff, E. W.: Temperature and precipitation history of the Arctic, Quat. Sci. Rev.; 29, 1679-1715, 2010.
63. Mock, C. J.; Bartlein, P. J.; and Anderson, P. M.: Atmospheric circulation patterns and spatial climatic variations in Beringia, Int. J. Climatol.; 18, 1085-1104, 1998.
64. Monnin, E.; Indermuhle, A.; Allenbach, A.; Fluckiger, J.; Stauffer, B.; Stocker, T. F.; Raynaud, D.; and Barnola, J. M.: Atmospheric CO2 concentrations over the last glacial termination, Science, 291, 112-114, 2001.
65. Myers-Smith, I. H.; Forbes, B. C.; Wilmking, M.; Hallinger, M.; Lantz, T.; Blok, D.; Tape, K. D.; Macias-Fauria, M.; Sass- Klaassen, U.; Levesque, E.; Boudreau, S.; Ropars, P.; Hermanutz, L.; Trant, A.; Collier, L. S.; Weijers, S.; Rozema, J.; Rayback, S. A.; Schmidt, N. M.; Schaepman-Strub, G.; Wipf, S.; Rixen, C.; Menard, C. B.; Venn, S.; Goetz, S.; Andreu-Hayles, L.; Elmendorf, S.; Ravolainen, V.;Welker, J.; Grogan, P.; Epstein, H. E.; and Hik, D. S.: Shrub expansion in tundra ecosystems: dynamics, impacts and research priorities, Environ. Res. Lett.; 6, 045509, doi:10.1088/1748-9326/6/4/045509, 2011.
66. Oechel, W. C.; Hastings, S. J.; Vourlitis, G.; Jenkins, M.; Riechers, G.; and Grulke, N.: Recent change of Arctic tundra ecosystems from a net carbon dioxide sink to a source, Nature, 361, 520-523, 1993.
67. Oncley, S. P.; Lenschow, D. H.; Campos, T. L.; Davis, K. J.; and Mann, J.: Regional-scale surface flux observations across the boreal forest during BOREAS, J. Geophys. Res.-Atmos.; 102, 29147-29154, 1997.
68. Osterkamp, T. E. and Romanovsky, V. E.: Evidence for warming and thawing of discontinuous permafrost in Alaska, Permafrost Periglac.; 10, 17-37, 1999.
69. Pal, J. S.; Giorgi, F.; Bi, X.; Elguindi, N.; Solon, F.; Gao, X.; Rausher, S. A.; Francisco, R.; Zakey, A.; Winter, J.; Ashfaq, M.; Syed, F. S.; Bell, J. L.; Diffenbaugh, N. S.; Karmacharya, J.; Konare, A.; Martinez, D.; Da Rocha, R. P.; Sloan, L. C.; and Steiner, A. L.: Regional climate modeling for the developing world: the ICTP RegCM3 and RegCNET, B. Am. Meteorol. Soc.; 88, 1395-1409, doi:10.1175/BAMS-88-9-1395, 2007.
70. Peltier, W. R.: Ice age paleotopography, Science, 265, 195-201, 1994.
71. Pielke, R. A. and Vidale, P. L.: The boreal forest and the polar front, J. Geophys. Res.-Atmos.; 100, 25755-25758, doi:10.1029/95JD02418, 1995.
72. Pinot, S.; Ramstein, G.; Harrison, S. P.; Prentice, I. C.; Guiot, J.; Stute, M.; and Joussaume, S.: Tropical paleoclimates at the Last Glacial Maximum: comparison of Paleoclimate Modeling Intercomparison Project (PMIP) simulations and paleodata, Clim. Dynam.; 15, 857-874, 1999.
73. Pollard, D. and Thompson, S. L.: Climate and ice-sheet mass balance at the last glacial maximum from the GENESIS version 2 global climate model, Quaternary Sci. Rev.; 16, 841-863, 1997.
74. Prentice, I. C. and Webb, T.: BIOME 6000: reconstructing global mid-Holocene vegetation patterns from palaeoecological records, J. Biogeogr.; 25, 997-1005, 1998.
75. Prentice, I. C.; Jolly, D.; and BIOME 6000 Participants: Mid- Holocene and glacial-maximum vegetation geography of the northern continents and Africa, J. Biogeogr.; 27, 507-519, 2000.
76. Rekacewicz, P.: Circumpolar Active-Layer Permafrost System (CAPS), version 1.0, UNEP, available at: http://nsidc.org/cryosphere/frozenground/whereis-fg.html (last access: 12 May 2014), 1998.
77. Ritchie, J. C. and Hare, F. K.: Late-Quaternary vegetation and climate near the arctic tree line of northwestern North America, Quaternary Res.; 1, 331-342, 1971.
78. Ritchie, J. C.; Cwynar, L. C.; and Spear, R. W.: Evidence from northwest Canada for an early Holocene Milankovitch thermal maximum, Nature, 205, 126-128, 1983.
79. Rivers, A. A. and Lynch, A. H.: On the influence of land cover on early Holocene climate in northern latitudes, J. Geophys. Res.- Atmos.; 109, D21114, doi:10.1029/2003JD004213, 2004.
80. Romanovskii, N. N.; Hubberten, H. W.; Gavrilov, A. V.; Tumskoy, V. E.; Tipenko, G. S.; Grigoriev, M. N.; and Siegert, C.: Thermokarst and land-ocean interactions, Laptev Sea Region, Russia, Permafrost Periglac.; 11, 137-152, 2000.
81. Romanovsky, V. E.; Smith, S. L.; and Christiansen, H. H.: Permafrost thermal state in the polar Northern Hemisphere during the International Polar Year 2007-2009: a Synthesis, Permafrost Periglac.; 21, 106-116, 2010.
82. Ruddiman, W. F.; Vavrus, S. J.; and Kutzbach, J. E.: A test of the overdue-glaciation hypothesis, Quaternary Sci. Rev.; 24, 1-10, doi:10.1016/j.quascirev.2004.07.010, 2005.
83. Serreze, M. C.; Holland, M. H.; and Stroeve, J.: Perspectives on the Arctics shrinking sea-ice cover, Science, 315, 1533-1536, doi:10.1126/science.1139426, 2007.
84. Smith, L. C.; Sheng, Y.; MacDonald, G. M.; and Hinzman, L. D.: Disappearing Arctic lakes, Science, 308, 1429, doi:10.1126/science.1108142, 2005.
85. Smith, T. M. and Shugart, H. H.: The transient response of terrestrial carbon storage to a perturbed climate, Nature, 361, 523-526, 1993.
86. Steinhauser, F.: Climatic Atlas of North And Central America, I, Maps of Mean Temperature and Precipitation, Hungary-World Meteorological Organization, UNESCO, 28 maps, 1979.
87. Sturm, M.; Racine, C.; and Tape, K.: Climate change - increasing shrub abundance in the Arctic, Nature, 411, 546-547, 2001.
88. Sturm, M.; Douglas, T.; Racine, C.; and Liston, G. E.: Changing snow and shrub conditions affect albedo with global implications, J. Geophys. Res.-Biogeo.; 110, G01004, doi:10.1029/2005JG000013, 2005.
89. Subin, Z. M.; Murphy, L. N.; Li, F.; Bonfils, C.; and Riley, W. J.: Boreal lakes moderate seasonal and diurnal temperature variation and perturb atmospheric circulation: analyses in the Community Earth System Model 1 (CESM1), Tellus, 64, 15639, doi:10.3402/tellusa.v64i0.15639, 2012.
90. Swann, A. L.; Fung, I. Y.; Levis, S.; Bonan, G. B.; and Doney, S. C.: Changes in Arctic vegetation amplify high-latitude warming through the greenhouse effect, P. Natl. Acad. Sci. USA, 107, 1295-1300, 2010.
91. Tabor, C. R.; Poulsen, C. J.; and Pollard, D.: Mending Milankovitchs theory: obliquity amplification by surface feedbacks, Clim. Past, 10, 41-50, doi:10.5194/cp-10-41-2014, 2014.
92. TEMPO Members: Potential role of vegetation feedback in the climate sensitivity of high-latitude regions: a case study at 6000 years B.P.; Global Biogeochem. Cy.; 10, 727-736, 1996.
93. Thomas, G. and Rowntree, P. R.: The boreal forests and climate, Q. J. Roy. Meteor. Soc.; 118, 469-497, 1992.
94. Thompson, S. L. and Pollard, D.: A global climate model (GENESIS) with a land-surface transfer scheme (LSX). Part I: Present climate simulation, J. Climate, 8, 732-761, doi:10.1175/1520- 0442(1995)008 2.0.CO;2, 1995.
95. Timm, O.; Timmermann, A.; Abe-Ouchi, A.; Saito, F.; and Segawa, T.: On the definition of seasons in paleoclimate simulations with orbital forcing, Paleoceanography, 23, PA2221, doi:10.1029/2007PA001461, 2008.
96. Walsh, J. E.; Zhou, X.; Portis, D.; and Serreze, M. C.: Atmospheric contribution to hydrologic variations in the Arctic, Atmos. Ocean, 32, 733-755, 1994.
97. Walter, K. M.; Zimov, S.; Chanton, J. P.; Verbyla, D.; and Chapin, F. S.: Methane bubbling from Siberian thaw lakes as a positive feedback to climate warming, Nature, 443, 71-75, 2006.
98. Walter, K. M.; Edwards, M. E.; Grosse, G.; Zimov, S. A.; and Chapin III, F. S.: Thermokarst lakes as a source of atmospheric CH4 during the last deglaciation, Science, 318, 633-636, 2007.
99. Walter Anthony, K. M.; Zimov, S. A.; Grosse, G.; Jones, M. C.; Anthony, P. M.; Chapin III, F. S.; Finlay, J. C.; Mack, M. C.; Davydov, S.; Frenzel, P.; and Frolking, S.: A shift of thermokarst lakes from carbon sources to sinks during the Holocene epoch, Nature, 511, 452-456, 2014.
100. Williams, J. R. and Yeend, W. E.: Deep thaw lake basins in the inner Arctic Coastal Plain, Alaska, in: U. S. Geological Survey in Alaska: Accomplishments During 1978, edited by: Johnson, K. M. and Williams, J. R.; USGS Circular, 804-B, B35-B37, 1979.
101. World Meteorological Organization: Climatic Atlas of Asia, WMOUnesco- Goscomgidromet, Geneva, Switzerland, 1981.
102. Yokoyama, Y.; Lambeck, K.; De Deckker, P.; Johnston, P.; and Fifield, L. K.: Timing of the Last Glacial Maximum from observed sea-level minima, Nature, 406, 713-716, 2000.
103. Zimov, S. A.; Schuur, E. A. G.; and Chapin III, F. S.: Permafrost and the global carbon budget, Science, 312, 1612-1613, 2006.