Helama, S.: search on Z-Library

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1

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 multi-centennial scales

Samuli Helama, Mauri Timonen, Jari Holopainen, Maxim G. Ogurtsov, Kari Mielikäinen, Matti Eronen, Markus Lindholm, Jouko Meriläinen

Journal:

Journal of Quaternary Science

Year:

2009

Language:

english

File:

PDF, 220 KB

english, 2009

2

Sub-Milankovitch solar forcing of past climates: Mid and late Holocene perspectives

Helama, S., Fauria, M. M., Mielikainen, K., Timonen, M., Eronen, M.

Journal:

Base of the Kiaman Its definition and global stratigraphic significance

Year:

2010

Language:

english

File:

PDF, 633 KB

english, 2010

3

Digitizing the plant phenological dataset (1750–1875) from collections of Professor Adolf Moberg: Towards the development of historical climate records

Holopainen, Jari, Helama, Samuli, Väre, Henry

Journal:

Agricultural and Forest Meteorology

Year:

2018

Language:

english

File:

PDF, 1.46 MB

english, 2018

4

Limited Late Antique cooling

Helama, Samuli, Jones, Phil D., Briffa, Keith R.

Journal:

Nature Geoscience

Year:

2017

Language:

english

File:

PDF, 252 KB

english, 2017

5

Dendroecology: A Guide for Using Trees to Date Geomorphic and Hydrologic Events, D.J. Wilford, P. Cherubini, M.E. Sakals. British Columbia Ministry of Forests, Forest Science Program, Land Management Handbook No. 58 (2005). 20 pp.

Journal:

Landscape and Urban Planning

Year:

2008

Language:

english

File:

PDF, 49 KB

english, 2008

6

Dark Ages Cold Period: A literature review and directions for future research

Helama, Samuli, Jones, Phil D, Briffa, Keith R

Journal:

Year:

2017

Language:

english

File:

PDF, 745 KB

english, 2017

7

Volcanic dust veils from sixth century tree-ring isotopes linked to reduced irradiance, primary production and human health

Helama, Samuli, Arppe, Laura, Uusitalo, Joonas, Holopainen, Jari, Mäkelä, Hanna M., Mäkinen, Harri, Mielikäinen, Kari, Nöjd, Pekka, Sutinen, Raimo, Taavitsainen, Jussi-Pekka, Timonen, Mauri, Oinonen,

Journal:

Scientific Reports

Year:

2018

Language:

english

File:

PDF, 2.63 MB

english, 2018

8

Persistence matters: Estimation of the statistical significance of paleoclimatic reconstruction statistics from autocorrelated time series

Marc Macias-Fauria, Aslak Grinsted, Samuli Helama, Jari Holopainen

Journal:

Dendrochronologia

Year:

2012

Language:

english

File:

PDF, 539 KB

english, 2012

9

Little Ice Age Farming in Finland: Preindustrial Agriculture on the Edge of the Grim Reaper's Scythe

Jari Holopainen and Samuli Helama

Journal:

Year:

2009

Language:

english

File:

PDF, 2.01 MB

english, 2009

10

Tree-ring science under the midnight sun: Papers from the 8th International Conference on Dendrochronology—WorldDendro 2010

Samuli Helama, Margaret S. Devall

Journal:

Dendrochronologia

Year:

2012

Language:

english

File:

PDF, 95 KB

english, 2012

11

Frost rings in 1627 BC and AD 536 in subfossil pinewood from Finnish Lapland

Helama, Samuli, Saranpää, Pekka, Pearson, Charlotte L., Arppe, Laura, Holopainen, Jari, Mäkinen, Harri, Mielikäinen, Kari, Nöjd, Pekka, Sutinen, Raimo, Taavitsainen, Jussi-Pekka, Timonen, Mauri, Uusit

Journal:

Quaternary Science Reviews

Year:

2019

Language:

english

File:

PDF, 4.01 MB

english, 2019

12

Mid- and late Holocene tree population density changes in northern Fennoscandia derived by a new method using megafossil pines and their tree-ring series

S. Helama, M. Lindholm, M. Timonen, M. Eronen

Journal:

Journal of Quaternary Science

Year:

2005

Language:

english

File:

PDF, 1.46 MB

english, 2005

13

Unprecedented low twentieth century winter sea ice extent in the Western Nordic Seas since A.D. 1200

M. Macias Fauria, A. Grinsted, S. Helama, J. Moore, M. Timonen, T. Martma, E. Isaksson, M. Eronen

Journal:

Climate Dynamics

Year:

2010

Language:

english

File:

PDF, 903 KB

english, 2010

14

Oak Decline as Illustrated Through Plant–Climate Interactions Near the Northern Edge of Species Range

Helama, Samuli, Sohar, Kristina, Läänelaid, Alar, Mäkelä, Hanna M., Raisio, Juha

Journal:

The Botanical Review

Year:

2016

Language:

english

File:

PDF, 1.10 MB

english, 2016

15

Exact dating of the Meghalayan lower boundary based on high-latitude tree-ring isotope chronology

Helama, Samuli, Oinonen, Markku

Journal:

Quaternary Science Reviews

Year:

2019

Language:

english

File:

PDF, 1.35 MB

english, 2019

16

Something old, something new, something borrowed: New insights to human-environment interaction in medieval Novgorod inferred from tree rings

Helama, Samuli, Huhtamaa, Heli, Verkasalo, Erkki, Läänelaid, Alar

Journal:

Journal of Archaeological Science: Reports

Year:

2017

Language:

english

File:

PDF, 1.38 MB

english, 2017

17

A fistful of shells: amplifying sclerochronological and palaeoclimate signals from molluscan death assemblages

HELAMA, S., NIELSEN, J. K., MACIAS FAURIA, M., VALOVIRTA, I.

Journal:

Geological Magazine

Year:

2009

Language:

english

File:

PDF, 976 KB

english, 2009

18

Multicentennial Ring-Width Chronologies of Scots Pine Along a North–South Gradient Across Finland

Helama, Samuli, Lindholm, Markus, Meriläinen, J. O. U. K. O., Timonen, Mauri, Eronen, Matti

Journal:

Tree-Ring Research

Year:

2005

Language:

english

File:

PDF, 245 KB

english, 2005

19

Subaerially preserved remains of pine stemwood as indicators of late Holocene timberline fluctuations in Fennoscandia, with comparisons of tree-ring and 14C dated depositional histories of subfossil trees from dry and wet sites

Helama, Samuli, Kuoppamaa, Mari, Sutinen, Raimo

Journal:

Review of Palaeobotany and Palynology

Year:

2020

File:

PDF, 3.64 MB

2020

20

Growth patterns of roadside Tilia spp. affected by climate and street maintenance in Helsinki

Helama, Samuli, LÃ¤Ã¤nelaid, Alar, Raisio, Juha, Sohar, Kristina, MÃ¤kelÃ¤, Antti

Journal:

Urban Forestry & Urban Greening

Year:

2020

File:

PDF, 2.67 MB

2020

21

Eemian marine mollusks and barnacles from Ristinge Klint, Denmark: hydrodynamics and oxygen deficiency

Nielsen, Jan K., Helama, S., Rodland, D., Nielsen, Jasper K.

Journal:

Netherlands Journal of Geosciences – Geologie en Mijnbouw

Year:

2007

Language:

english

File:

PDF, 21.24 MB

english, 2007

22

Distant impact: tropical volcanic eruptions and climate-driven agricultural crises in seventeenth-century Ostrobothnia, Finland

Huhtamaa, Heli, Helama, Samuli

Journal:

Journal of Historical Geography

Year:

2017

Language:

english

File:

PDF, 767 KB

english, 2017

23

Late Holocene climatic variability reconstructed from incremental data from pines and pearl mussels – a multi-proxy comparison of air and subsurface temperatures

SAMULI HELAMA, ALAR LÄÄNELAID, HANNA TIETÄVÄINEN, MARC MACIAS FAURIA, ILMO T. KUKKONEN, JARI HOLOPAINEN, JAN K. NIELSEN, ILMARI VALOVIRTA

Journal:

Year:

2010

Language:

english

File:

PDF, 416 KB

english, 2010

24

Little Ice Age Farming in Finland: Preindustrial Agriculture on the Edge of the Grim Reaper’s Scythe

Jari Holopainen, Samuli Helama

Journal:

Year:

2009

Language:

english

File:

PDF, 395 KB

english, 2009

25

Comparison of living-tree and subfossil ringwidths with summer temperatures from 18th, 19th and 20th centuries in Northern Finland

S. Helama, J. Holopainen, M. Timonen, M.G. Ogurtsov, M. Lindholm, J. Meriläinen, M. Eronen

Journal:

Dendrochronologia

Year:

2004

Language:

english

File:

PDF, 192 KB

english, 2004

26

EVALUATING CONTEMPORANEITY AND POST-MORTEM AGE OF MALACOLOGICAL REMAINS USING SCLEROCHRONOLOGY AND DENDROCHRONOLOGY*

S. HELAMA, J. K. NIELSEN, I. VALOVIRTA

Journal:

Year:

2009

Language:

english

File:

PDF, 404 KB

english, 2009

27

Fractal and topological dynamics for the analysis of paleoclimatic records

L. Karimova, Y. Kuandykov, N. Makarenko, M.M. Novak, S. Helama

Journal:

Physica A: Statistical Mechanics and its Applications

Year:

2007

Language:

english

File:

PDF, 339 KB

english, 2007

28

Reconstructing crop yield variability in Finland: Long-term perspective of the cultivation history on the agricultural periphery since ad 760

Huhtamaa, Heli, Helama, Samuli

Journal:

Year:

2017

Language:

english

File:

PDF, 912 KB

english, 2017

29

Common growth signal and spatial synchrony of the chronologies of tree-rings from pines in the Baltic Sea region over the last nine centuries

Alar Läänelaid, Samuli Helama, Ain Kull, Mauri Timonen, Jaak Jaagus

Journal:

Dendrochronologia

Year:

2012

Language:

english

File:

PDF, 1.39 MB

english, 2012

30

Exact dating of the Meghalayan lower boundary based on high-latitude tree-ring isotope chronology

Helama, Samuli, Oinonen, Markku

Journal:

Quaternary Science Reviews

Year:

2019

File:

PDF, 1.35 MB

2019

31

Compound response of marine and terrestrial ecosystems to varying climate: Pre-anthropogenic perspective from bivalve shell growth increments and tree-rings

Samuli Helama, Bernd R. Schöne, Andreas J. Kirchhefer, Jan K. Nielsen, David L. Rodland, Ronald Janssen

Journal:

Marine Environmental Research

Year:

2007

Language:

english

File:

PDF, 567 KB

english, 2007

32

A palaeotemperature record for the Finnish Lakeland based on microdensitometric variations in tree rings

Helama, Samuli, Vartiainen, Matti, Holopainen, Jari, Mäkelä, Hanna M., Kolström, Taneli, Meriläinen, Jouko

Journal:

Geochronometria

Year:

2014

Language:

english

File:

PDF, 1.22 MB

english, 2014

33

LA-ICP-MS-derived U-concentrations and microstructural domains within biogenic aragonite ofArctica islandicashell

Helama, Samuli, Heikkilä, Pasi, Rinne, Katja, Nielsen, Jan Kresten, Nielsen, Jesper Kresten

Journal:

Environmental Monitoring and Assessment

Year:

2015

Language:

english

File:

PDF, 1.32 MB

english, 2015

34

Direct transformation of tree-ring measurements into palaeoclimate reconstructions in three-dimensional space

Matskovsky, V., Helama, S.

Journal:

Year:

2015

Language:

english

File:

PDF, 1.62 MB

english, 2015

35

Quasisecular cyclicity in the climate of the Earth’s Northern Hemisphere and its possible relation to solar activity variations

M. G. Ogurtsov, H. Jungner, M. Lindholm, S. Helama, V. A. Dergachev

Journal:

Geomagnetism and Aeronomy

Year:

2009

Language:

english

File:

PDF, 185 KB

english, 2009

36

Quantifications of dendrochronological information from contrasting microdensitometric measuring circumstances of experimental wood samples

S. Helama, Y. Bégin, M. Vartiainen, H. Peltola, T. Kolström, J. Meriläinen

Journal:

Applied Radiation and Isotopes

Year:

2012

Language:

english

File:

PDF, 1.03 MB

english, 2012

37

Late Weichselian varve archives re-explored to assess proglacial sedimentary chronologies using the principles of tree-ring analysis

Helama, S., Hyttinen, O., Salonen, V.-P.

Journal:

Progress in Physical Geography

Year:

2012

Language:

english

File:

PDF, 756 KB

english, 2012

38

Erratum to: Connecting potential frost damage events identified from meteorological records to radial growth variation in Norway spruce and Scots pine

Suvanto, Susanne, Henttonen, Helena M., Nöjd, Pekka, Helama, Samuli, Repo, Tapani, Timonen, Mauri, Mäkinen, Harri

Journal:

Year:

2017

Language:

english

File:

PDF, 589 KB

english, 2017

39

Oak decline in Helsinki portrayed by tree-rings, climate and soil data

S. Helama, A. Läänelaid, J. Raisio, H. Tuomenvirta

Journal:

Year:

2009

Language:

english

File:

PDF, 390 KB

english, 2009

40

Coexisting responses in tree-ring δ13C to high-latitude climate variability under elevated CO2: A critical examination of climatic effects and systematic discrimination rate changes

Helama, Samuli, Arppe, Laura, Uusitalo, Joonas, Mäkelä, Hanna M., Oinonen, Markku, Mielikäinen, Kari

Journal:

Agricultural and Forest Meteorology

Year:

2016

Language:

english

File:

PDF, 2.52 MB

english, 2016

41

Buried in water, burdened by natureâResilience carried the Iron Age people through Fimbulvinter

Oinonen, Markku, Alenius, Teija, Arppe, Laura, Bocherens, HervÃ©, Etu-Sihvola, Heli, Helama, Samuli, Huhtamaa, Heli, Lahtinen, Maria, Mannermaa, Kristiina, Onkamo, PÃ¤ivi, Palo, Jukka, Sajantila, Antt

Journal:

Year:

2020

File:

PDF, 3.01 MB

2020

42

Temperature-associated suicide mortality: contrasting roles of climatic warming and the suicide prevention program in Finland

Samuli Helama, Jari Holopainen…

Journal:

Environmental Health and Preventive Medicine

Year:

2013

Language:

english

File:

PDF, 337 KB

english, 2013

43

Arctic moistening provides negative feedbacks to riparian plants

Helama, Samuli, Arppe, Laura, Mielikäinen, Kari, Oinonen, Markku

Journal:

Global Change Biology

Year:

2018

Language:

english

File:

PDF, 1.82 MB

english, 2018

44

Dendroclimatic transfer functions revisited: Little Ice Age and Medieval Warm Period summer temperatures reconstructed using artificial neural networks and linear algorithms

Helama, S., Makarenko, N. G., Karimova, L. M., Kruglun, O. A., Timonen, M., Holopainen, J., MerilÃ¤inen, J., Eronen, M.

Journal:

Annales Geophysicae

Year:

2009

File:

PDF, 849 KB

2009

45

Dendroclimatological analysis of seeded and thinned Scots pine (Pinus sylvestrisL.) stands at the coniferous timberline

Samuli Helama, Hannu Salminen, Mauri Timonen, Martti Varmola

Journal:

Year:

2008

Language:

english

File:

PDF, 510 KB

english, 2008

46

Spring temperature variability relative to the North Atlantic Oscillation and sunspots — A correlation analysis with a Monte Carlo implementation

Samuli Helama, Jari Holopainen

Journal:

Palaeogeography, Palaeoclimatology, Palaeoecology

Year:

2012

Language:

english

File:

PDF, 826 KB

english, 2012

47

Dendroclimatic signals of pedunculate oak (Quercus roburL.) in Estonia

Sohar, Kristina, Läänelaid, Alar, Eckstein, Dieter, Helama, Samuli, Jaagus, Jaak

Journal:

European Journal of Forest Research

Year:

2014

Language:

english

File:

PDF, 882 KB

english, 2014

48

Oak decline analyzed using intraannual radial growth indices, δ13C series and climate data from a rural hemiboreal landscape in southwesternmost Finland

Helama, S., Läänelaid, A., Raisio, J., Mäkelä, H. M., Hilasvuori, E., Jungner, H., Sonninen, E.

Journal:

Environmental Monitoring and Assessment

Year:

2014

Language:

english

File:

PDF, 808 KB

english, 2014

49

Dendrochronologically dated changes in the limit of pine in northernmost Finland during the past 7.5 millennia

Helama, Samuli, Lindholm, Markus, Timonen, Mauri, Eronen, Matti

Journal:

Year:

2004

Language:

english

File:

PDF, 260 KB

english, 2004

50

[IEEE 2011 International Symposium on Water Resource and Environmental Protection (ISWREP) - Xi'an (2011.5.20-2011.5.22)] 2011 International Symposium on Water Resource and Environmental Protection - Temperature variability inferred from tree rings of Qinling region in north-central China

Qinhua Tian,, Helama, Samuli, Ping Zhao,

Year:

2011

Language:

english

File:

PDF, 489 KB

english, 2011

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