Dendroclimatic transfer functions revisited: Little ice age and medieval warm period summer temperatures reconstructed using artificial neural networks and linear algorithms

Annales Geophysicae

Volumn 27, Issue 3, 2009, Pages 1097-1111

  Helama, S ^a   Makarenko, N G ^b   Karimova, L M ^c   Kruglun, O A ^c   Timonen, M ^d   Holopainen, J ^a   Merilainen J ^e   Eronen, M ^a  

^a UNIVERSITY OF HELSINKI   (Finland)

^b RUSSIAN ACADEMY OF SCIENCES   (Russian Federation)

^c INSTITUTE OF MATHEMATICS AND MATHEMATICAL MODELING   (Kazakhstan)

^d FINNISH FOREST RESEARCH INSTITUTE   (Finland)

^e UNIVERSITY OF EASTERN FINLAND   (Finland)

Author keywords

Hydrology; Instruments and techniques; Meteorology and atmospheric dynamics; Paleoclimatology; Plant ecology

Indexed keywords

ARTIFICIAL NEURAL NETWORK; ATMOSPHERIC DYNAMICS; CLIMATE VARIATION; DATA SET; DENDROCLIMATOLOGY; LITTLE ICE AGE; MEDIEVAL WARM PERIOD; PALEOCLIMATE; PALEOTEMPERATURE; SUMMER; TRANSFER FUNCTION; TREE RING;

LAPLAND;

EID: 75149118975     PISSN: 09927689     EISSN: 14320576     Source Type: Journal    
DOI: 10.5194/angeo-27-1097-2009     Document Type: Article

References (105)

1. Berninger, F., Hari, P., Nikinmaa, E., Lindholm, M., and Meriläinen, J.: Use of modeled photosynthesis and decomposition to describe tree growth at the northern treeline, Tree Physiol., 24, 193-204, 2004. (Pubitemid 38318803)
2. Fejer, B. C., Farley, D. T., Woodman, R. F., and Calderon, C.: Dependence of equatorial F-region vertical drift on season and solar cycle, Geophys. Res. Lett., 86, 215-218, 1981
3. Bishop, C. M.: Neural Networks for Pattern Recognition, Clarendon Press, Oxford, 1996.
4. Black, B. A., Boehlert, G. W., and Yoklavich, M. M.: Using treering crossdating techniques to validate annual growth increments in long-lived fishes, Can. J. Fish. Aquat. Sci., 62, 2277-2284, 2005.
5. Bradley, R. S.: Paleoclimatology: reconstructing climates of the Quaternary, Academic Press, London, 1999.
6. Bradley, R. S. and Jones, P. D.: 'Little Ice Age' summer temperature variations: their nature and relevance to recent global warming trends, Holocene, 3, 367-376, 1993.
7. Bradley, R. S., Hughes, M. K., and Diaz, H. F.: Climate in Medieval Time, Science, 302, 404-405, 2003.
8. Briffa, K. R.: Annual climate variability in the Holocene: interpreting the message of ancient trees, Quaternary Sci. Rev., 19, 87-105, 2000.
9. Briffa, K. R., Bartholin, T. S., Eckstein, D., Jones, P. D., Karlén, W., Schweingruber, F. H., and Zetterberg, P.: A 1,400-year tree-ring record of summer temperatures in Fennoscandia, Nature, 346, 434-439, 1990.
10. Briffa, K. R., Jones, P. D., Bartholin, T. S., Eckstein, D., Schweingruber, F. H., Karlén, W., Zetterberg, P., and Eronen, M.: Fennoscandian summers from AD 500: temperature changes on short and long timescales, Clim. Dynam., 7, 111-119, 1992.
11. Briffa, K. R., Jones, P. D., Pilcher, J. R., and Hughes, M. K.: Reconstructing summer temperatures in northern Fennoscandia back to AD 1700 using tree-ring data from Scots pine, Arct. Alpine Res., 20, 385-394, 1988.
12. Briffa, K. R., Jones, P. D., Schweingruber, F. H., and Osborn, T. J.: Influence of volcanic eruptions on Northern Hemisphere over the past 600 years, Nature, 393, 450-455, 1998.
13. Briffa, K. R., Jones, P. D., Schweingruber, F. H., Shiyatov, S. G., and Cook, E. R.: Unusual twentieth-century summer warmth in a 1,000-year temperature record from Siberia, Nature, 376, 156-159, 1995.
14. Briffa, K. R., Osborn, T. J., Schweingruber, F. H., Harris, I. C., Jones, P. D., Shiyatov, S. G., and Vaganov, E.: Low-frequency temperature variations from a northern tree ring density network, J. Geophys. Res., 106, 2929-2941, 2001. (Pubitemid 32232815)
15. Briffa, K. R., Osborn, T. J., Schweingruber, F. H., Jones, P. D., Shiyatov, S. G., and Vaganov, E. A.: Tree-ring width and density data around the Northern Hemisphere: Part 1, local and regional climate signals, Holocene, 12, 737-751, 2002a.
16. Briffa, K. R., Osborn, T. J., Schweingruber, F.H., Jones, P. D., Shiyatov, S. G., and Vaganov, E. A.: Tree-ring width and density data around the Northern Hemisphere: Part 2, spatio-temporal variability and associated climate patterns, Holocene, 12, 759-789, 2002b. (Pubitemid 35391544)
17. Carrer, M. and Urbinati, C.: Assessing climate-growth relationships: a comparative study between linear and non-linear methods, Dendrochronologia, 19, 57-65, 2001.
18. Collins, M., Osborn, T. J., Tett, S. F. B., Briffa, K. R., and Schweingruber, F. H.: A comparison of the variability of a climate model with paleotemperature estimates from a network of tree-ring densities, J. Climate, 15, 1497-1515, 2002.
19. Cook, E. R.: A time series analysis approach to tree-ring standardization, Doctoral dissertation, University of Arizona, Tucson, 1985.
20. Cook, E. R. and Kairiukstis, L. A. (Eds.): Methods of Dendrochronology, Kluwer Academic Publishers, Dordrecht, 1990.
21. Cook, E. R. and Peters, K.: The smoothing spline: A new approach to standardizing forest interior tree-ring width series for dendroclimatic studies, Tree-Ring Bull., 41, 45-53, 1981.
22. Cook, E. R., Woodhouse, C., Eakin, C. M., Meko, D. M., and Stahle, D. W.: Long-term aridity changes in the western United States, Science, 306, 1015-1018, 2004, (Pubitemid 39482901)
23. Crowley, T. J. and Lowery, T. S.: How Warm Was the Medieval Warm Period?, Ambio, 29, 51-54, 2000.
24. D'Arrigo, R. and Jacoby, G. C.: Secular trends in high northern latitude temperature reconstructions based on tree rings, Climatic Change, 25, 163-177, 1993. (Pubitemid 2020380)
25. D'Arrigo, R., Wilson, R., and Jacoby, G.: On the long-term context for late twentieth century warming, J. Geophys. Res., 111, D03103, doi:10.1029/2005JD006352, 2006.
26. de Silva, S. L. and Zielinski, G. A.: Global influence of the AD 1600 eruption of Huaynaputina, Peru, Nature, 393, 455-458, 1998. (Pubitemid 28292188)
27. D'Odorico, P., Revelli, R., and Ridolfi, L.: On the use of neural networks for dendroclimatic reconstructions, Geophys. Res. Lett., 27, 791-794, 2000. (Pubitemid 32012158)
28. Douglass, A. E.: Crossdating in dendrochronology, J. Forest., 39, 825-831, 1941.
29. Eronen, M., Zetterberg, P., Briffa, K. R., Lindholm, M., Meriläinen, J., and Timonen, M.: The supra-long Scots pine tree-ring record for Finnish Lapland: Part 1, chronology construction and initial references, Holocene, 12, 673-680, 2002. (Pubitemid 35391536)
30. Esper, J., Cook, E. R., and Schweingruber, F. H.: Low-Frequency Signals in Long Tree-Ring Chronologies for Reconstructing Past Temperature Variability, Science, 295, 2250-2253, 2002. (Pubitemid 34258835)
31. Esper, J., Frank, D. C., Wilson, R. J. S., and Briffa, K. R.: Effect of scaling and regression on reconstructed temperature amplitude for the past millennium, Geophys. Res. Lett., 32, L07711, doi:10.1029/2004GL021236, 2005. (Pubitemid 40959012)
32. Folland, C. K., Rayner, N. A., Brown, S. J., Smith, T. M., Shen, S. S. P., Parker, D. E., Macadam, I., Jones, P. D., Jones, R. N., Nicholls, N., and Sexton, D. M. H.: Global temperature change and its uncertainties since 1861, Geophys. Res. Lett., 28, 2621-2624, 2001. (Pubitemid 32704456)
33. Fritts, H. C.: An Approach to Dendroclimatology: Screening by Means of Multiple Regression Techniques, J. Geophys. Res., 67, 1413-1420, 1962.
34. Fritts, H. C.: Tree Rings and Climate, Academic Press, London, 1976.
35. Fritts, H. C. and Wu, X.: A Comparison Between Response Function Analysis and Other Regression Techniques, Tree-Ring Bull., 46, 31-46, 1986.
36. Fritts, H. C., Blasing, T. J., Hayden, B. P., and Kutzbach, J. E.: Multivariate techniques for Specifying Tree-Growth and Climate Relationships and for Reconstructing Anomalies in Paleoclimate, J. Appl. Meteorol., 10, 845-864, 1971.
37. Gervais, B. R. and MacDonald, G. M.: A 403-year record of July temperatures and treeline dynamics of Pinus sylvestris from Kola Peninsula, Northwest Russia, Arct. Antarct. Alp. Res., 32, 295-302, 2000.
38. Gervais, B. R. and MacDonald, G. M.: Tree-ring and summertemperature response to volcanic aerosol forcing at the northern tree-line, Kola Peninsula, Russia, Holocene, 11, 499-505, 2001.
39. Gorban, A. N.: Approximation of continuous functions of several variables by an arbitrary nonlinear continuous function of one variable, linear functions, and their superpositions, Appl. Math. Lett., 11, 45-49, 1998.
40. Grove, J. H.: The Little Ice Age, Routledge, London, 1988.
41. Grudd, H., Briffa, K. R., Karlén, W., Bartholin, T. S., Jones, P. D., and Kromer, B.: A 7400-year tree-ring chronology in northern Swedish Lapland: natural climatic variability expressed on annual to millennial timescales, Holocene, 12, 657-665, 2002. (Pubitemid 35391534)
42. Guiot, J.: The extrapolation of recent climatological series with spectral canonical regression, J. Climatol., 5, 325-335, 1985.
43. Guiot, J.: ARMA techniques for modelling tree-ring response to climate and for reconstructing variations of paleoclimates, Ecol. Model., 33, 149-171, 1986.
44. Hantemirov, R. M. and Shiyatov, S. G.: A continuous multimillennial ring-width chronology in Yamal, northwestern Siberia, Holocene, 12, 717-726, 2002.
45. Helama, S., Lindholm, M., Timonen, M., Meriläinen, J., and Eronen, M.: The supra-long Scots pine tree-ring record for Finnish Lapland: Part 2, interannual to centennial variability in summer temperatures for 7500 years, Holocene, 12, 681-687, 2002. (Pubitemid 35391537)
46. Helama, S. and Lindholm, M.: Droughts and rainfall in southeastern Finland since AD 874, inferred from Scots pine ringwidths, Boreal Env. Res., 8, 171-183, 2003. (Pubitemid 36809738)
47. Helama, S., Holopainen, J., Timonen, M., Ogurtsov, M. G., Lindholm, M., Meriläinen, J., and Eronen, M.: Comparison of living-tree and subfossil ring-widths with summer temperatures from 18th, 19th and 20th centuries in northern Finland, Dendrochronologia, 21, 147-154, 2004a.
48. Helama, S., Lindholm, M., Timonen, M., and Eronen, M.: Dendrochronologically dated changes in the limit of pine in northernmost Finland during the past 7.5 millennia, Boreas, 33, 250-259, 2004b. (Pubitemid 39080994)
49. Helama, S., Lindholm, M., Meriläinen, J., Timonen, M., and Eronen, M.: Multicentennial ring-width chronologies of Scots pine along north-south gradient across Finland, Tree-Ring Res., 61, 21-32, 2005a.
50. Helama, S., Timonen, M., Lindholm, M., Meriläinen, J., and Eronen, M.: Extracting long-period climate fluctuations from treering chronologies over timescales of centuries to millennia, Int. J. Climatol., 25, 1767-1779, 2005b. (Pubitemid 41623045)
51. Helama, S., Schöne, B. R., Black, B. A., and Dunca, E.: Constructing long-term proxy series for aquatic environments with absolute dating control using a sclerochronological approach: introduction and advanced applications, Mar. Freshwater Res., 57, 591-599, 2006. (Pubitemid 44357689)
52. Helama, S., Schöne, B. R., Kirchhefer, A. J., Nielsen, J. K., Rodland, D. L., and Janssen, R.: Compound response of marine and terrestrial ecosystems to varying climate: pre-anthropogenic perspective from bivalve shell growth increments and tree-rings, Mar. Environ. Res., 63, 185-199, 2007a. (Pubitemid 46210083)
53. Helama, S., Timonen, M. I., Holopainen, J., Ogurtsov, M. G., Eronen, M., Lindholm, M., and Meriläinen, J.: Hemispheric changes of internal and forced variability recorded in regional climate - imprints of Medieval Warm Period, Little Ice Age and twentieth century warmth in proxy-based temperature reconstruction at high-latitudes of Europe. Quaternary Int., supplement, 167-168, 163, 2007b.
54. Helama, S., Timonen, M., Holopainen, J., Ogurtsov, M. G., Mielikäinen, K., Eronen, M., Lindholm, M., and Meriläinen J.: Summer temperature variations in Lapland during the Medieval Warm Period and the Little Ice Age relative to natural instability of thermohaline circulation on multi-decadal and multicentennial scales, J. Quatern. Sci., in press, 2009.
55. Helle, S. and Helama, S.: Climatic Variability and the Population Dynamics of Historical Hunter-Gatherers: The Case of Sami of Northern Finland, Am. J. Hum. Biol., 19, 844-853, 2007. (Pubitemid 350081543)
56. Helle, S., Helama, S., and Jokela, J.: Temperature-related birth sex ratio bias in historical Sami: warm years bring more sons, Biol. Lett., 4, 60-62, 2008a.
57. Helle, S., Käär, P., Helama, S., and Jokela, J.: Do humans adjust offspring sex according to local operational sex ratio?, Evol. Ecol. Res., 10, 775-785, 2008b.
58. Holmes, R. L.: Computer-assisted quality control in tree-ring dating and measurement, Tree-Ring Bull., 43, 69-75, 1983.
59. Holopainen, J.: Reconstructions of past climates from documentary and natural sources in Finland since the 18th century. Doctoral dissertation, Publications of the Department of Geology, D9, 1-33, 2006.
60. Hughes, M. K., Kelly, P. M., Pilcher, J. R., and Lamarche Jr., V. C. (Eds.): Climate from tree rings, Cambridge University Press, Cambridge, 1982.
61. Hustich, I. and Elfving, G.: Die Radialzuwachsvaariationen der Waldgrenzkiefer, Soc. Scient. Fenn., Comm. Biologicae, 9(8), 1-18, 1944.
62. Jacoby, G. C. and D'Arrigo, R.: Reconstructed Northern Hemisphere annual temperature since 1671 based on high-latitude tree-ring data from North America, Climatic Change, 14, 39-59, 1989.
63. Jones, P. D. and Moberg, A.: Hemispheric and large-scale surface air temperature variations: an extensive revision and an update to 2001, J. Climate, 16, 206-223, 2003. (Pubitemid 37164442)
64. Jones, P. D., Briffa, K. R., Barnett, T. P., and Tett, S. F. B.: Highresolution palaeoclimatic records for the last millennium: interpretation, integration and comparison with General Circulation Model control-run temperatures, Holocene, 8, 455-471, 1998.
65. Jones, P. D., New, M., Parker, D. E., Martin, S., and Rigor, I. G.: Surface air temperature and its changes over the past 150 years, Rev. Geophys., 37, 173-199, 1999. (Pubitemid 29453882)
66. Kalela-Brundin, M.: Climatic information from tree-rings of Pinus sylvestris L. and a reconstruction of summer temperatures back to AD 1500 in Femundsmarka, eastern Norway using partial least squares regression (PLS) analysis, Holocene, 9, 59-77, 1999. (Pubitemid 29068682)
67. Keller, T., Guiot, J., and Tessier, L.: Climatic Effect of Atmospheric CO2 Doubling on Radial Tree Growth in South Eastern France, J. Biogeogr., 24, 857-864, 1997. (Pubitemid 28084479)
68. Kirchhefer, A. J.: The influence of slope aspect on radial increment of Pinus sylvestris L. in northern Norway and its implications for climate reconstruction, Dendrochronologia, 18, 27-40, 2000.
69. Kirchhefer, A. J.: Reconstruction of summer temperature from tree rings of Scots pine, Pinus sylvestris L., in coastal northern Norway, Holocene, 11, 41-52, 2001.
70. Kirchhefer, A. J.: A discontinuous tree-ring record AD 320-1994 from Dividalen, Norway: inferences on climate and treeline history, in: Mountain Ecosystems: Studies in Treeline Ecology, edited by: Broll, G. and Keplin, B., pp. 219-235, Springer-Verlag, Heidelberg-Berlin, 2005.
71. Klingbjer, P. and Moberg, A.: A composite monthly temperature record from Tornedalen in northern Sweden, 1802-2002, Int. J. Climatol., 23, 1465-1494, 2003. (Pubitemid 37358585)
72. Lamb, H. H.: The early medieval warm epoch and its sequel, Palaeogeogr. Palaeocl., 1, 13-37, 1965.
73. Lara, A. and Villalba, R.: A 3620-Year Temperature Record from Fitzroya cupressoides Tree Rings in Southern South America, Science, 260, 1104-1106, 1993.
74. Lindholm, M.: Reconstruction of past climate from ring-width chronologies of Scots pine (Pinus sylvestris L.) at the northern forest limit in Fennoscandia. Doctoral dissertation, Publications in Sciences, University of Joensuu, 40, 1-169, 1996.
75. Lindholm, M. and Eronen, M.: A reconstruction of mid-summer temperatures from ring-widths of Scots pine since AD 50 in northern Fennoscandia, Geogr. Ann., 82A, 527-535, 2000. (Pubitemid 32205976)
76. Lindholm, M., Lehtonen, H., Kolström, T., Meriläinen, J., Eronen, M., and Timonen, M.: Climatic signals extracted from ring-width chronologies of Scots pine from the Northern, Middle and Southern parts of the boreal forest belt in Finland, Silva Fenn., 34, 317-329, 2000. (Pubitemid 32119925)
77. Mann, M. E., Bradley, R. S., and Hughes, M. K.: Northern hemisphere temperatures during the past millennium: inferences, uncertainties, and limitations, Geophys. Res. Lett., 26, 759-762, 1999.
78. Matthews, J. A. and Briffa, K. R.: The 'Little Ice Age': Reevaluation of an evolving concept, Geogr. Ann., 87A, 17-36, 2005. (Pubitemid 40865023)
79. McCarroll, D., Jalkanen, R., Hicks, S., Tuovinen, M., Gagen, M., Pawellek, F., Eckstein, D., Schmitt, U., Autio, J., and Heikkinen, O.: Multiproxy dendroclimatology: a pilot study in northern Finland, Holocene, 13, 829-838, 2003. (Pubitemid 37292503)
80. Moberg, A., Sonechkin, D. M., Holmgren, K., Datsenko, N. M., Karlén, W., and Lauritzen, S. E.: Highly variable Northern Hemisphere temperatures reconstructed from low-and highresolution proxy data, Nature, 433, 613-617, 2005. (Pubitemid 40282990)
81. Naurzbaev, M. M., Vaganov, E. A., Sidorova, O. V., and Schweingruber, F. H.: Summer temperatures in eastern Taimyr inferred from a 2427-year late-Holocene tree-ring chronology and earlier floating series, Holocene, 12, 727-736, 2002.
82. Ni, F., Cavazos, T., Hughes, M. K., Comrie, A. C., and Funkhouser, G.: Cool-season precipitation in the southwestern USA since AD 1000: comparison of linear and nonlinear techniques for reconstruction, Int. J. Climatol., 22, 1645-1662, 2002. (Pubitemid 35381499)
83. Ogurtsov, M. G., Helama, S., Eronen, M., and Lindholm, M.: Centennial-to-millennial fluctuations in July temperatures in North Finland as recorded by timberline tree rings of Scots pine, Quaternary Res., 63, 182-188, 2005. (Pubitemid 40301112)
84. Ogurtsov, M. G., Kocharov, G. E., Lindholm, M., Meriläinen, J., and Eronen, M.: Evidence of solar variation in tree-ring-based climate reconstructions, Sol. Phys., 205, 403-417, 2002. (Pubitemid 37133181)
85. Ogurtsov, M. G., Kocharov, G. E., Lindholm, M., Eronen, M., and Nagovitsyn, Yu. A.: Solar activity and regional climate in northern Fennoscandia, Radiocarbon, 43, 144-156, 2001.
86. Ogurtsov, M. G., Raspopov, O. M., Helama, S., Oinonen, M., Lindholm, M., Jungner, H., and Meriläinen J.: Climatic variability along a north-south transect of Finland over the last 500 years: Signature of solar influence or internal climate oscillations?, Geogr. Ann., 90A, 141-150, 2008.
87. Osborn, T. J. and Briffa, K. R.: Revisiting timescale-dependent reconstruction of climate from tree-ring chronologies, Dendrochronologia, 18, 9-25, 20000.
88. Osborn, T. J. and Briffa, K. R.: The Real Color of Climate Change?, Science, 306, 621-622, 2004.
89. Osborn, T. J. and Briffa, K. R.: The Spatial Extent of 20th-Century Warmth in the Context of the Past 1200 Years, Science, 311, 841-844, 2006.
90. Overpeck, J., Hughen, K., Hardy, D., Bradley, R., Case, R., Douglas, M., Finney, B., Gajewski, K., Jacoby, G., Jennings, A., Lamoureux, S., Lasca, A., MacDonald, G., Moore, J., Retelle, M., Smith, S., Wolfe, A., and Zielinski, G.: Arctic Environmental Change of the Last Four Centuries, Science, 278, 1251-1256, 1997. (Pubitemid 27495731)
91. Pilcher, J. R., Baillie, M. G. L., Schmidt, B., and Becker, B.: A 7,272-year tree-ring chronology for western Europe, Nature, 312, 150-152, 1984.
92. Robock, A.: The "Little Ice Age": Northern Hemisphere average observations and model calculations, Science, 206, 1402-1404, 1979.
93. Roig, F. A., Le-Quesne, C., Boninsegna, J. A., Briffa, K. R., Lara, A., Grudd, H., Jones, P. D., and Villagrán, C.: Climate variability 50,000 years ago in mid-latitude Chile as reconstructed from tree rings, Nature, 410, 567-570, 2001. (Pubitemid 32267197)
94. Rutherford, S., Mann, M. E., Osborn, T. J., Bradley, R. S., Briffa, K. R., Hughes, M. K., and Jones, P. D.: Proxy-Based Northern Hemisphere Surface Temperature Reconstructions: Sensitivity to Method, Predictor Network, Target Season, and Target Domain, J. Climate, 18, 2308-2329, 2005. (Pubitemid 41460982)
95. Schulman, E.: Dendroclimatic changes in Semiarid America, University of Arizona Press, Tucson, 1956.
96. Schweingruber, F. H.: Tree Rings. Basics and Applications of Dendrochronology, Kluwer Academic Publishers, Dordrecht, 1988.
97. Sirén, G.: Skogsgränstallen som indicator för klimatfluktuationerna i norra Fennoskandien under historisk tid, Commun. Inst. For. Fenn., 54, 1-66, 1961.
98. Spurk, M., Leushcner, H. H., Baillie, M. G. L., Briffa, K. R., and Friedrich, M.: Depositional frequency of German subfossil oaks: climatically and non-climatically induced fluctuations in the Holocene, Holocene, 12, 707-715, 2002. (Pubitemid 35391540)
99. Stahle, D. W., Cleaveland, M. K., Blanton, D. B., Therrell, M. D., and Gay, D. A.: The Lost Colony and Jamestown Droughts, Science, 280, 564-567, 1998.
100. Strom, A., Francis, R. C., Mantua, N. J., Miles, E. L., and Peterson, D. L.: North Pacific climate recorded in growth rings of geoduck clams - a new tool for paleoenvironmental reconstruction, Geophys. Res. Lett., 31, L06206, doi:10.1029/2004GL019440, 2004. (Pubitemid 38763416)
101. Veijola, P.: The northern timberline and timberline forests in Fennoscandia, Finn. For. Res. Inst. Res. Pap., 672, 1-242, 1998.
102. von Stroch, H., Zorita, E., Jones, J. M., Dimitriev, Y., González-Rouco, F., and Tett, S. F. B.: Reconstructing Past Climate from Noisy Data, Science, 306, 679-682, 2004. (Pubitemid 39440914)
103. Vorren, K.-D.: Farm development at the Arctic cereal limit in northern Norway - continuity and discontinuities, Veg. Hist. Archaeobot., 14, 161-170, 2005.
104. Woodhouse, C. A.: Artificial neural networks and dendroclimatic reconstructions: an example from the Front Range Colorado, USA, Holocene, 9, 521-529, 1999.
105. Zhang, Q.-B., Hebda, R. J., Zhang, Q.-J., and Alfaro, R.: Modeling Tree-Ring Growth Responses to Climatic Variables Using Artificial Neural Networks, Forest Sci., 46, 229-239, 2000. (Pubitemid 30322891)