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

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

12

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

13

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

14

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

15

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

16

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

17

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

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

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

20

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

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

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

23

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

24

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

25

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

26

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

27

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

28

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

29

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

30

Climatic variability and the population dynamics of historical hunter–gatherers: The case of Sami of Northern Finland

Samuli Helle, Samuli Helama

Journal:

American Journal of Human Biology

Year:

2007

Language:

english

File:

PDF, 198 KB

english, 2007

31

Extracting long-period climate fluctuations from tree-ring chronologies over timescales of centuries to millennia

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

Journal:

International Journal of Climatology

Year:

2005

Language:

english

File:

PDF, 220 KB

english, 2005

32

Dendrochronological investigation of wood extractives

Samuli Helama, Matti Vartiainen, Taneli Kolström, Jouko Meriläinen

Journal:

Wood Science and Technology

Year:

2010

Language:

english

File:

PDF, 416 KB

english, 2010

33

X-ray microdensitometry applied to subfossil tree-rings: growth characteristics of ancient pines from the southern boreal forest zone in Finland at intra-annual to centennial time-scales

Samuli Helama, Matti Vartiainen, Taneli Kolström, Heli Peltola, Jouko Meriläinen

Journal:

Vegetation History and Archaeobotany

Year:

2008

Language:

english

File:

PDF, 586 KB

english, 2008

34

Plant phenological data and tree-rings as palaeoclimate indicators in south-west Finland since AD 1750

Jari Holopainen, Samuli Helama, Mauri Timonen

Journal:

International Journal of Biometeorology

Year:

2006

Language:

english

File:

PDF, 436 KB

english, 2006

35

ENSO-coupled precipitation records (1959–2004) based on shells of freshwater bivalve mollusks (Margaritifera falcata) from British Columbia

Bernd R. Schöne, Nicholas A. Page, David L. Rodland, Jens Fiebig, Sven Baier, Samuli O. Helama, Wolfgang Oschmann

Journal:

International Journal of Earth Sciences

Year:

2007

Language:

english

File:

PDF, 1.27 MB

english, 2007

36

Detection of climate signal in dendrochronological data analysis: a comparison of tree-ring standardization methods

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

Journal:

Theoretical and Applied Climatology

Year:

2004

Language:

english

File:

PDF, 610 KB

english, 2004

37

A multiproxy reconstruction of spring temperatures in south-west Finland since 1750

Jari Holopainen, Samuli Helama, Juha M. Kajander, Johanna Korhonen, Jouko Launiainen, Heikki Nevanlinna, Anni Reissell, Veli-Pekka Salonen

Journal:

Climatic Change

Year:

2009

Language:

english

File:

PDF, 624 KB

english, 2009

38

Ontogenetic morphometrics of individual freshwater pearl mussels (Margaritifera margaritifera(L.)) reconstructed from geometric conchology and trigonometric sclerochronology

Samuli Helama, Ilmari Valovirta

Journal:

Year:

2008

Language:

english

File:

PDF, 431 KB

english, 2008

39

Shell growth history of geoduck clam (Panopea abrupta) in Parry Passage, British Columbia, Canada: Temporal variation in annuli and the Pacific Decadal Oscillation

Jan Kresten Nielsen, Samuli Helama, Bernd Schöne

Journal:

Journal of Oceanography

Year:

2008

Language:

english

File:

PDF, 826 KB

english, 2008

40

Construction of statistically reliable sclerochronology using subfossil shells of river pearl mussel

Samuli Helama, Jan Kresten Nielsen

Journal:

Journal of Paleolimnology

Year:

2008

Language:

english

File:

PDF, 509 KB

english, 2008

41

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

42

Evolutionary ecology of human birth sex ratio under the compound influence of climate change, famine, economic crises and wars

Samuli Helle, Samuli Helama, Kalle Lertola

Journal:

Journal of Animal Ecology

Year:

2009

Language:

english

File:

PDF, 252 KB

english, 2009

43

CLIMATIC VARIABILITY ALONG A NORTH–SOUTH TRANSECT OF FINLAND OVER THE LAST 500 YEARS: SIGNATURE OF SOLAR INFLUENCE OR INTERNAL CLIMATE OSCILLATIONS?

MAXIM G. OGURTSOV, OLEG M. RASPOPOV, SAMULI HELAMA, MARKKU OINONEN, MARKUS LINDHOLM, HOGNE JUNGNER, JOUKO MERILÄINEN

Journal:

Geografiska Annaler: Series A, Physical Geography

Year:

2008

Language:

english

File:

PDF, 445 KB

english, 2008

44

PALEOCLIMATOLOGICAL EVIDENCE FOR UNPRECEDENTED RECENT TEMPERATURE RISE AT THE EXTRATROPICAL PART OF THE NORTHERN HEMISPHERE

MAXIM G. OGURTSOV, HOGNE JUNGNER, SAMULI HELAMA, MARKUS LINDHOLM, MARKKU OINONEN

Journal:

Geografiska Annaler: Series A, Physical Geography

Year:

2011

Language:

english

File:

PDF, 729 KB

english, 2011

45

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

SAMULI HELAMA, MARKUS LINDHOLM, MAURI TIMONEN, MATTI ERONEN

Journal:

Year:

2004

Language:

english

File:

PDF, 256 KB

english, 2004

46

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

47

Mikuláš R. and Dronov A.,Palaeoichnology—Introduction to the Study of Trace Fossils, Institute of Geology, Academy of Sciences of Czech Republic, Prague, 2006, 122 pp.

J. K. Nielsen, S. Helama

Journal:

Paleontological Journal

Year:

2008

Language:

english

File:

PDF, 95 KB

english, 2008

48

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

49

Mortality of urban pines in Helsinki explored using tree rings and climate records

Samuli Helama, Alar Läänelaid, Juha Raisio, Heikki Tuomenvirta

Journal:

Year:

2012

Language:

english

File:

PDF, 438 KB

english, 2012

50

Fusing pollen-stratigraphic and dendroclimatic proxy data to reconstruct summer temperature variability during the past 7.5

Samuli Helama, Heikki Seppä, Anne E. Bjune, H. John B. Birks

Journal:

Journal of Paleolimnology

Year:

2012

Language:

english

File:

PDF, 627 KB

english, 2012