The benthic foraminiferal record of the Medieval Warm Period and the recent warming in the Gullmar Fjord, Swedish west coast

Marine Micropaleontology

Volumn 81, Issue 3-4, 2011, Pages 95-106

  Polovodova, I ^a   Nordberg, K ^a   Filipsson, H L ^b  

^a UNIVERSITY OF GOTHENBURG   (Sweden)

^b LUND UNIVERSITY   (Sweden)

Author keywords

Benthic foraminifera; Medieval Warm Period; Nonionella iridea; Positive NAO; Recent warming

Indexed keywords

ABUNDANCE; BENTHIC FORAMINIFERA; CARBON ISOTOPE; COMMUNITY STRUCTURE; DOMINANCE; GLOBAL WARMING; LITTLE ICE AGE; MEDIEVAL; ORGANIC CARBON; OXYGEN; PALEOENVIRONMENT; PRECIPITATION (CLIMATOLOGY); PRIMARY PRODUCTION; RADIOCARBON DATING; RESOLUTION; RUNOFF; TERRESTRIAL ENVIRONMENT; TROPHIC STATUS; TWENTIETH CENTURY;

GULLMARSFJORDEN; SWEDEN; VASTRA GOTALAND;

ADERCOTRYMA GLOMERATA; CASSIDULINA LAEVIGATA; FORAMINIFERA; NONIONELLA IRIDEA;

EID: 80053346316     PISSN: 03778398     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.marmicro.2011.09.002     Document Type: Article

References (114)

1. Alve E. Foraminifera, climatic change, and pollution: a study of Late Holocene sediments in Drammensfjord, southeast Norway. The Holocene 1991, 1(3):243-261.
2. Alve E. Opportunistic features of the foraminifer Stainforthia fusiformis (Williamson): evidence from Frierfjord, Norway. Journal of Micropalaeontology 1994, 13:24.
3. Alve E. Benthic foraminiferal evidence of environmental change in the Skagerrak over the past six decades. Bulletin Norges Geologiske Undersoekels 1996, 430:85-93.
4. Alve E. A common opportunistic foraminiferal species as an indicator of rapidly changing conditions in a range of environments. Estuarine Coastal and Shelf Science 2003, 57(3):501-514.
5. Alve E. Benthic foraminiferal responses to absence of fresh phytodetritus: a two-year experiment. Marine Micropaleontology 2010, 76:67-75.
6. Alve E., Murray J.W. Temporal variability in vertical distributions of live (stained) intertidal foraminifera, southern England. Journal of Foramineferal Research 2001, 31(1):12-24.
7. Andersson H.C. Effects of Topography on Ocean Thermohaline Circulation and of Climate Variability on Baltic Sea Water Exchange 2003, A 84 2003, Earth Science Centre, Göteborg University, Sweden.
8. Arneborg L. Turnover times for the water above sill level in Gullmar Fjord. Continental Shelf Research 2004, 24(4-5):443-460.
9. Austin H.A., Austin W.E.N., Paterson D.M. Extracellular cracking and content removal of the benthic diatom Pleurosigma angulatum (Quekett) by the benthic foraminifera Haynesina germanica (Ehrenberg). Marine Micropaleontology 2005, 57:68-73.
10. Bernhard J.M., Alve E. Survival, ATP pool, and ultrastructural characterization of benthic foraminifera from Drammensfjord (Norway); response to anoxia. Marine Micropaleontology 1996, 28(1):5-17.
11. Bernhard J.M., Bowser S.S. Benthic foraminifera of dysoxic sediments: chloroplast sequestration and functional morphology. Earth-Science Reviews 1999, 46:149-165.
12. Bernhard J.M., Sen Gupta B.K. Foraminifera of oxygen-depleted environments. Modern Foraminifera 1999, 201-216. Kluwer, Dordrecht. B.K. Sen Gupta (Ed.).
13. Björk G., Nordberg K. Upwelling along the Swedish west coast during the 20th century. Continental Shelf Research 2003, 23(11-13):1143-1159.
14. Bondevik S., Mangerud J., Birks H.H., Gulliksen S., Reimer P. Changes in North Atlantic radiocarbon reservoir ages during the Allerød and Younger Dryas. Science 2006, 312:1514-1517.
15. Bronk Ramsey C. Improving the resolution of radiocarbon dating by statistical analysis. The Bible and Radiocarbon Dating: Archaeology, Text and Science 2005, 57-64. Equinox, London. T.E. Levy, T.F.G. Higham (Eds.).
16. Brückner S., Mackensen A. Deep-water renewal in the Skagerrak during the last 1200 years triggered by the North Atlantic Oscillation: evidence from benthic foraminiferal delta O-18. The Holocene 2006, 16(3):331-340.
17. Caralp M. Abundance of Bulimina exilis and Melonis barleeanum: relationship to the quality of marine organic matter. Geo-Marine Letters 1989, 9(1):37-43.
18. Cedhagen T. Position in the sediment and feeding of Astrorhiza limicola SANDAHL, 1857 (FORAMINIFERIDA). Sarsia 1988, 73:43-47.
19. Cedhagen T. Retention of chloroplasts and bathymetric distribution in the sublittoral foraminiferan Nonionellina labradorica. Ophelia 1991, 33(1):17-30.
20. Chen D.L., Hellström C. The influence of the North Atlantic Oscillation on the regional temperature variability in Sweden: spatial and temporal variations. Tellus 1999, 51A(4):505-516.
21. Conradsen K.H., Bergsten H., Knudsen K.L., Nordberg K., Seidenkrantz M.S. Recent benthic foraminiferal distribution in the Kattegat and the Skagerrak, Scandinavia. Cushman Found. Foramineferal Research Special Publication 1994, 32:53-68.
22. Cronin T.M., Dwyer G.S., Kamiya T., Schwede S., Willard D.A. Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay. Global and Planetary Change 2003, 36(1-2):17-29.
23. Crowley T.J., Lowery T.S. How warm was the medieval warm period?. Ambio 2000, 29(1):51-54.
24. De Rijk S., Jorissen F.J., Rohling E.J., Troelstra S.R. Organic flux control on bathymetric zonation of Mediterranean benthic foraminifera. Marine Micropaleontology 2000, 40:151-166.
25. De Stigter H.C., Jorissen F.J., van der Zwaan G.J. Bathymetric distribution and microhabitat partitioning of live (Rose Bengal stained) benthic foraminifera along a shelf to bathyal transect in the southern Adriatic Sea. Journal of Foramineferal Research 1998, 28(1):40-65.
26. Diaz P.J., Rosenberg R. Marine benthic hypoxia: a review of its ecological efffects and the behavioural responses of benthic macrofauna. Oceanographic and Marine Biology Annual Review 1995, 33:245-303.
27. Duchemin G., Jorissen F.J., Andrieux-Loyer F., Le Loc'h F., Hily C., Philippon X. Living benthic foraminifera from "La Grande Vasiere", French Atlantic continental shelf: faunal composition and microhabitats. Journal of Foramineferal Research 2005, 35(3):198-218.
28. Duchemin G., Fontanier C., Jorissen F.J., Barras C., Grive C. Living small-sized (63-150 μm) foraminifera from mid-shelf to mid-slope environments in the Bay of Biscay. Journal of Foramineferal Research 2007, 37(1):12-32.
29. Duchemin G., Jorissen F.J., Le Loc'h F., Andrieux-Loyer F., Hily C., Thouzeau G. Seasonal variability of living benthic foraminifera from the outer continental shelf of the Bay of Biscay. Journal of Sea Research 2008, 59:297-319.
30. Eberwein A., Mackensen A. Last Glacial Maximum paleoproductivity and water masses off NW-Africa: evidence from benthic foraminifera and stable isotopes. Marine Micropaleontology 2008, 67:87-103.
31. Eiriksson J., Knudsen K.L., Haflidason H., Heinemeier J. Chronology of late Holocene climatic events in the northern North Atlantic based on AMS C-14 dates and tephra markers from the volcano Hekla, Iceland. Journal of Quaternary Science 2000, 15(6):573-580.
32. Eiriksson J., Bartels-Jonsdottir H.B., Cage A.G., Gudmundsdottir E.R., Klitgaard-Kristensen D., Marret F., Rodrigues T., Abrantes F., Austin W.E.N., Jiang H., Knudsen K.L., Sejrup H.P. Variability of the North Atlantic Current during the last 2000 years based on shelf bottom water and sea surface temperatures along an open ocean/shallow marine transect in western Europe. The Holocene 2006, 16(7):1017-1029.
33. Eriksson C., Omstedt A., Overland J.E., Percival D.B., Mofjeld H.O. Characterizing the European sub-Arctic winter climate since 1500 using ice, temperature and atmospheric circulation time series. Journal of Climate 2007, 20(21):5316-5334.
34. Erlandsson C.P., Stigebrandt A., Arneborg L. The sensitivity of minimum oxygen concentrations in a fjord to changes in biotic and abiotic external forcing. Limnology and Oceanography 2006, 51(1):631-638.
35. Ernst S., Van der Zwaan B. Effects of experimentally induced raised levels of organic flux and oxygen depletion on a continental slope benthic foraminiferal community. Deep Sea Research 2004, I(51):1709-1739.
36. Filipsson H.L., Nordberg K. Climate variations, an overlooked factor influencing the recent marine environment. An example from Gullmar Fjord, Sweden, illustrated by benthic foraminifera and hydrographic data. Estuaries 2004, 27(5):867-881.
37. Filipsson H.L., Nordberg K. Variations in organic carbon flux and stagnation periods during the last 2400 years in a Skagerrak fjord basin, inferred from benthic foraminiferal δ13C. Geological Society Special Publication 2010, vol. 344:261-270. J.A. Howe, W.E.N. Austin, M. Forwick, R.D. Powell, M. Paetzel (Eds.).
38. Fonselius S. The upwellings of nutrients in the central Skagerrak. Deep Sea Research Part II 1996, 43(1):57-71.
39. Fontanier C., Jorissen F.J., Licari L., Alexandre A., Anschutz P., Carbonel P. Live benthic foraminiferal faunas from the Bay of Biscay: faunal density, composition, and microhabitats. Deep Sea Research Part I: Oceanographic Research Papers 2002, 49(4):751-785.
40. Goldstein S.T., Bernhard J.M., Richardson E.A. Chloroplast sequestration in the foraminifer Haynesina germanica: application of high pressure freezing and freeze substitution. Microscopy and Microanalysis 2004, 10(02):1458-1459. 10.1017/S1431927604885891.
41. Gooday A.J. Deep-sea benthic foraminiferal species which exploit phytodetritus-characteristic features and controls on distribution. Marine Micropaleontology 1993, 22(3):187-205.
42. Gooday A.J., Hughes J.A. Foraminifera associated with phytodetritus deposits at a bathyal site in the northern Rockall Trough (NE Atlantic): seasonal contrasts and a comparison of stained and dead assemblages. Marine Micropaleontology 2002, 46(1-2):83-110.
43. Gooday A.J., Rathburn A.E. Temporal variability in living deep-sea benthic foraminifera: a review. Earth-Science Reviews 1999, 46:187-212.
44. Gunnarson B.E., Linderholm H.W., Moberg A. Improving a tree-ring reconstruction from west-central Scandinavia - 900 years of warm-season temperatures. Climate Dynamics 2011, 36:97-108.
45. Gustafsson M., Nordberg K. Living (stained) benthic foraminifera and their response to the seasonal hydrographic cycle, periodic hypoxia and to primary production in Havstens Fjord on the Swedish west coast. Estuarine Coastal Shelf Science 2000, 51(6):743-761.
46. Gustafsson M., Nordberg K. Living (stained) benthic foraminiferal response to primary production and hydrography in the deepest part of the Gullmar Fjord, Swedish West Coast, with comparisons to Hoglund's 1927 material. Journal of Foramineferal Research 2001, 31(1):2-11.
47. Hågeryd A.-C., Viberg L., Lind B. Frekvens av skred i Sverige/Frequency of landslides in Sweden. Sweden Geotechnical Institute Report 2007, 583. Linköping 2007.
48. Harland R., Nordberg K., Filipsson H.L. The seasonal occurrence of dinoflagellate cysts in surface sediments from Koljö Fjord, west coast of Sweden - a note. Review of Palaeobotany and Palynology 2004, 128:107-117.
49. Harland R., Nordberg K., Filipsson H.L. Dinoflagellate cysts and hydrographical change in Gullmar Fjord, west coast of Sweden. Science of the Total Environment 2006, 355(1-3):204-231.
50. Harman R.A. Distribution of foraminifera in the Santa Barbara Basin, California. Micropaleontology 1964, 10(1):81-96.
51. Hass H.C. Northern Europe climate variations during late Holocene: evidence from marine Skagerrak. Palaeogeography, Palaeoclimatology, Palaeoecology 1996, 123:121-145.
52. Hebbeln D., Knudsen K.L., Gyllencreutz R., Kristensen P., Klitgaard-Kristensen D., Backman J., Scheurle C., Jiang H., Gil I., Smelror M., Jones P.D., Sejrup H.P. Late Holocene coastal hydrographic and climate changes in the eastern North Sea. The Holocene 2006, 16(7):987-1001.
53. Heier-Nielsen S., Heinemeier J., Nielsen H.L., Rud N. Recent reservoir ages for Danish fjords and marine waters. Radiocarbon 1995, 37(3):875-882.
54. Heinz P., Kitazato H., Schmiedl G., Hemleben C. Response of deep-sea benthic foraminifera from the Mediterranean Sea to simulated phytoplankton pulses under laboratory conditions. Journal of Foramineferal Research 2001, 31(3):210-227.
55. Heinz P., Ruepp R., Hemleben C. Benthic foraminifera assemblages at Great Meteor Seamout. Marine Biology 2004, 144(5):985-998.
56. Hillefors A. Excursion: Weichsel glaciation chronology of western Sweden and the Göta River valley. GFF 1983, 104(3):280-285.
57. Höglund H. Foraminifera in the Gullmar Fjord and the Skagerrak. Zoologiska Bidrag från Uppsala 1947, 26. Uppsala University Band, 328pp.
58. Hughes M.K., Diaz H.F. Was there a Medieval Warm Period, and if so, where and when?. Climatic Change 1994, 26(2-3):109-142.
59. Hurrell J.W. Decadal trends in the North Atlantic Oscillation: regional temperatures and precipitation. Science 1995, 269(5224):676-679.
60. Johnson M.D. The acquisition of phototrophy: adaptive strategies of hosting endosymbionts and organelles. Photosynthesis Research 2010, 10.1007/s11120-010-9546-8.
61. Josefson A.B., Widbom B. Differential response of benthic macrofauna and meiofauna to hypoxia in the Gullmar-Fjord basin. Marine Biology 1988, 100(1):31-40.
62. Karageorgis A.P., Kaberi H.G., Tengberg A., Zervakis V., Hall P.O.J., Anagnostou C. Comparison of particulate matter distribution, in relation to hydrography, in the mesotrophic Skagerrak and the oligotrophic northeastern Aegean Sea. Continental Shelf Research 2003, 23:1787-1809.
63. Lamb H.H. Climate History and the Modern World 1995, Routledge, London and New York.
64. Lee J.J., Anderson O.R. Symbiosis in foraminifera. Biology of foraminifera 1991, 157-220. Academic Press, New York. J.J. Lee, O.R. Anderson (Eds.).
65. Leijonhufvud L., Wilson R., Moberg A., Söderberg J., Retsö D., Söderlind U. Five centuries of Stockholm winter/spring temperatures reconstructed from documentary evidence and instrumental observations. Climate Change 2010, 101:109-141. 10.1007/s10584-009-9650-y.
66. Leslie R.G. Ecology and paleoecology of Hudson Bay benthic foraminifera. Bedford Inst Oceanogr. Rep. 1965, 65-66.
67. Lindahl O. Primary production in the Gullmar Fjord. Swedish National Report on Eutrophication Status in the Kattegat and the Skagerrak. OSPAR ASSESSMENT 2007 2007, 41-43. B. Håkansson (Ed.).
68. Lindahl O., Hernroth L. Phyto-zooplankton community in coastal waters of western Sweden - an ecosystem off balance?. Marine Ecology Progress Series 1983, 10:119-126.
69. Loeblich A.R., Tappan H. Studies of arctic foraminifera. Smithsonian Miscellaneous Collections 1953, 121:150.
70. Mackensen A., Hald M. Cassidulina teretis TAPPAN and Cassidulina laevigata D'ORBIGNY - their modern and late quaternary distribution in northern seas. Journal of Foramineferal Research 1988, 18(1):16-24.
71. Mann M.E., Jones P.D. Global surface temperatures over the past two millennia. Geophysical Research Letters 2003, 30(15). 10.1029/2003GL017814.
72. Marshall J., Kushnir Y., Battisti D., Chang P., Czaja A., Dickson R., Hurrel J., McCartney M., Saravanan R., Visbeck M. North Atlantic climate variability: phenomena impacts and mechanisms. International Journal of Climatology 2001, 21:1863-1898.
73. Mendes I., Gonzalez R., Dias J.M.A., Lobo F., Martins V. Factors influencing recent benthic forarninifera distribution on the Guadiana shelf (Southwestern Iberia). Marine Micropaleontology 2004, 51(1-2):171-192.
74. Mikalsen G., Sejrup H.P., Aarseth I. Late-Holocene changes in ocean circulation and climate: foraminiferal and isotopic evidence from Sulafjord, western Norway. The Holocene 2001, 11(4):437-446.
75. Moodley L., Hess C. Tolerance of infaunal benthic foraminifera for low and high oxygen concentrations. Biology Bulletin 1992, 183:94-98.
76. Morris C.D. Viking Orkney: a survey. The Prehistory of Orkney 1985, Edinburgh University Press, Edinburgh. C. Renfrew (Ed.).
77. Murray J.W. An atlas of British Recent Foraminiferids 1971, American Elsevier Publishing Co., Inc., New York.
78. Murray J.W. Distribution and Ecology of Living Benthic Foraminiferids 1973, Crane, Russak and Co., Inc., New York.
79. Murray J.W. Ecology and Palaeoecology of Benthic Foraminifera 1991, Longman Scientific & Technical, Longman Group UK Limited.
80. Murray J.W. Foraminiferal assemblage formation in depositional sinks on the continental shelf west of Scotland. Journal of Foramineferal Research 2003, 33(2):101-121.
81. Murray J.W. Ecology and Applications of Benthic Foraminifera 2006, Cambridge University Press, Cambridge.
82. Murray J.W., Alve E. High diversity agglutinated foraminiferal assemblages from the NE Atlantic: dissolution experiments. Cushman Foundation Special Publication 1994, 32:33-51.
83. Nagy J., Qvale G. Benthic foraminifers in upper Quaternary Skagerrak deposits. Norsk Geologisk Tidsskrift 1985, 65:107-113.
84. Nesje A., Dahl S.O. The Little Ice Age - only temperature?. The Holocene 2003, 13(1):139-145.
85. Nixon S.W. Coastal marine eutrophication: a definition, social causes, and future concerns. Ophelia 1995, 41:199-219.
86. 13C-labeled bacteria and algae by deep-sea benthic foraminifera. Marine Ecology Progress Series 2006, 310:95-108.
87. Nordberg K. Oceanography in the Kattegat and Skagerrak over the past 8000 years. Paleoceanography 1991, 6(4):461-484.
88. Nordberg K., Gustafsson M., Krantz A.L. Decreasing oxygen concentrations in the Gullmar Fjord, Sweden, as confirmed by benthic foraminifera, and the possible association with NAO. Journal of Marine Systems 2000, 23(4):303-316.
89. Nordberg K., Filipsson H.L., Gustafsson M., Harland R., Roos P. Climate, hydrographic variations and marine benthic hypoxia in Koljö Fjord, Sweden. Journal of Sea Research 2001, 46:187-200.
90. Nordberg K., Filipsson H.L., Linne P., Gustafsson M. Stable oxygen and carbon isotope information on the establishment of a new, opportunistic foraminiferal fauna in a Swedish Skagerrak fjord basin, in 1979/1980. Marine Micropaleontology 2009, 73(1-2):117-128.
91. Ottersen G., Planque B., Belgrano A., Post E., Reid P.C., Stenseth N.C. Ecological effects of the North Atlantic Oscillation. Oecologia 2001, 128(1):1-14.
92. Patterson R.T., Fishbein E. Re-examination of the statistical methods used to determine the number of point counts needed for micropaleontological quantitative research. Journal of Paleontology 1989, 63:245-248.
93. Pettersson O., Ekman G. Grunddragen af Skageracks och Kattegats hydrografi. Kongliga Svenska Vetenskaps-akademiens handlingar 1891, 24:13.
94. Phleger F.B., Soutar A. Production of benthic foraminifera in three east Pacific oxygen minima. Micropaleontology 1973, 19:110-115.
95. Pillet L., De Vargas C., Pawlowski J. Molecular identification of sequestered diatom chloroplasts and kleptoplastidy in foraminifera. Protist 2011, 10.1016/j.protis.2010.10.001.
96. Piña-Ochoa E., Høgslund S., Geslin E., Cedhagen T., Revsbech N.P., Nielsen L.P., Schweizer M., Jorissen F., Rysgaard S., Risgaard-Petersen N. Widespread occurrence of nitrate storage and denitrification among Foraminifera and Gromiida. PNAS 2010, 107(3):1148-1153.
97. Proctor C.J., Baker A., Barnes W.L., Gilmour R.A. A thousand year speleothem proxy record of North Atlantic climate from Scotland. Climate Dynamics 2000, 16(10-11):815-820.
98. Rankka K., Anderssen-Sköld Y., Hulten C., Larsson R., Leroux V., Dahlin T. Quick clay in Sweden. Sweden Geotechnical Institute Reports 2004, 65. 146pp.
99. Reimer P.J., Baillie M.G.L., Bard E., Bayliss A., Beck J.W., Bertrand C.J.H., Blackwell P.G., Buck C.E., Burr G.S., Cutler K.B., Damon P.E., Edwards R.L., Fairbanks R.G., Friedrich M., Guilderson T.P., Hogg A.G., Hughen K.A., Kromer B., McCormac G., Manning S., Ramsey C.Bronk, Reimer R.W., Remmele S., Southon J.R., Stuiver M., Talamo S., Taylor F.W., van der Plicht J., Weyhenmeyer C.E. IntCal04 terrestrial radiocarbon age calibration, 0-26calkyr BP. Radiocarbon 2004, 46(3):1029-1058.
100. Risdal D. Foraminiferfaunaes relasjon til dybdelforholdene i Oslofjorden, med en diskusjon av de senkvartaere foraminifersoner. Bulletin Norges Geologiske Undersoekels 1964, 226:142.
101. Risgaard-Petersen N., Langezaal A.M., Ingvardsen S., Schmid M.C., Jetten M.S.M., Op Den Camp H.J.M., Derksen J.W.M., Piña-Ochoa E., Eriksson S.P., Nielsen L.P., Revsbech N.P., Cedhagen T., Van Der Zwaan G.J. Evidence for complete denitrification in a benthic foraminifer. Nature 2006, 443:93-96.
102. Ross C.R. Hyalinea balthica and its late Quaternary paleoclimatic implications; Strait of Sicily. Journal of Foramineferal Research 1984, 14(2):134-139.
103. Schöllhorn E., Graneli E. Influence of different nitrogen to silica ratios and artificial mixing on the structure of a summer phytoplankton community from the Swedish west coast (Gullmar Fjord). Journal of Sea Research 1996, 35(1-3):159-167.
104. Schröder C.J. Subsurface preservation of agglutinated Foraminifera in the Northwest Atlantic Ocean. Second Workshop on Agglutinated Foraminifera: Abhandlungen der Geologischen Bundesanstalt 1988.
105. Sejrup H.P., Lehman S.J., Haflidason H., Noone D., Muscheler R., Berstad I.M., Andrews J.T. Response of Norwegian Sea temperature to solar forcing since 1000 A.D. Journal of Geophysical Research 2010, 115:c12034. 10.1029/2010jc006264.
106. 14C data. Radiocarbon 1977, 19:355-363.
107. SWEDISH METEOROLOGICAL AND HYDROLOGICAL INSTITUTE (SMHI) Vattenföring i Sverige, Del 4: Vattendrag till Västerhavet. 43, SMHI Svenskt Vattenarkiv 1994.
108. Sweetman A.K., Sommer S., Pfannkuche O., Witte U. Retarded response by macrofauna-size foraminifera to phytodetritus in a deep Norwegian fjord. Journal of Foramineferal Research 2009, 39(1):15-22.
109. Tiselius P., Kuylenstierna M. Growth and decline of a diatom spring bloom: phytoplankton species composition, formation of marine snow and the role of heterotrophic dinoflagellates. Journal of Plankton Research 1996, 18(2):133-155.
110. Trouet V., Esper J., Graham N.E., Baker A., Scourse J.D., Frank D.C. Persistent positive North Atlantic Oscillation mode dominated the medieval climate anomaly. Science 2009, 324(5923):78-80.
111. Van Weering T.C.E., Qvale G. Recent sediments and foraminiferal distribution in the Skagerrak, North-Eastern North Sea. Marine Geology 1983, 52(1-2):75-99.
112. Wenner C.G. Data on Swedish landslides. Geologiska Föreningens i Stockholm Förhandlingar 1951, 73(2):300-308. 465.
113. Williamson M.A., Keen C.E., Mudie P.J. Foraminiferal distribution on the continental margin off Nova Scotia. Marine Micropaleontology 1984, 9(3):219-239.
114. Zicheng Y., Ito E. Historical solar variability and midcontinent drought. PAGES Newsletter 2000, 8:6-7.