Works by Helama, Samuli

Results: 84

Suicide Mortality in European Countries and Post-Soviet States since 1955: Illustrating the Longtime Trends and Patterns of Recent Changes.

Published in:

Suicidology Online, 2015, v. 6, n. 1, p. 7

By:

Helama, Samuli;
Holopainen, Jari;
Partonen, Timo

Publication type:

Article

Subfossil Scots Pine (Pinus sylvestris L.) Wood from Northern Finland—Physical, Mechanical, and Chemical Properties and Suitability for Specialty Products.

Published in:

Forests (19994907), 2022, v. 13, n. 5, p. N.PAG, doi. 10.3390/f13050704

By:

Möttönen, Veikko;
Helama, Samuli;
Pranovich, Andrey;
Korotkova, Ekaterina;
Xu, Chunlin;
Herva, Hannu;
Heräjärvi, Henrik;
Mäkinen, Harri;
Nöjd, Pekka;
Jyske, Tuula

Publication type:

Article

Dendrochronological dating of wooden artifacts by measuring the tree rings using magnifying glass and photography-assisted method: an example of a Dutch panel painting.

Published in:

Archaeological & Anthropological Sciences, 2016, v. 8, n. 1, p. 161, doi. 10.1007/s12520-014-0222-3

By:

Helama, Samuli;
Läänelaid, Alar;
Santala, Maija;
Tanhuanpää, Ari

Publication type:

Article

Dendroclimatology. Progress and Prospects. Malcolm K. Hughes, Thomas W. Swetnam, Henry F. Diaz (Eds.) Developments in Paleoenvironmental Research, Vol. 11. 1st Edition, 2011, XII, 365 p. Hardcover, ISBN 978-1-4020-4010-8.

Published in:

2012

By:

Helama, Samuli

Publication type:

Book Review

A Review of Citation Patterns in Doctoral Dissertations at the Department of Geology, University of Helsinki, Finland, since 1896.

Published in:

Science & Technology Libraries, 2012, v. 31, n. 2, p. 180, doi. 10.1080/0194262X.2012.676870

By:

Helama, Samuli

Publication type:

Article

Tricentennial trends in spring ice breakups in three rivers in northern Europe.

Published in:

Cryosphere Discussions, 2021, p. 1, doi. 10.5194/tc-2021-326

By:

Norrgård, Stefan;
Helama, Samuli

Publication type:

Article

Death assemblages of the freshwater mussels Unio crassus and U. tumidus (Bivalvia, Unionidae) from southern Finland: comparing taphonomical data with <sup>14</sup>C dates.

Published in:

Bulletin of Geosciences, 2021, v. 96, n. 4, p. 459, doi. 10.3140/bull.geosci.1798

By:

NIELSEN, JAN KRESTEN;
HELAMA, SAMULI

Publication type:

Article

An invertebrate macrofauna from an early Holocene fjord-delta system, North Norway.

Published in:

Bulletin of Geosciences, 2018, v. 93, n. 1, p. 27, doi. 10.3140/bull.geosci.1677

By:

NIELSEN, JAN KRESTEN;
NIELSEN, JESPER KRESTEN;
EVISON, KENNETH;
HANKEN, NILS-MARTIN;
HELAMA, SAMULI

Publication type:

Article

Dendroclimatic signals of pedunculate oak ( Quercus robur L.) in Estonia.

Published in:

European Journal of Forest Research, 2014, v. 133, n. 3, p. 535, doi. 10.1007/s10342-014-0783-9

By:

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

Publication type:

Article

A 434-year tree-ring chronology of spruce (Picea abies) with indications of Estonian precipitation.

Published in:

Dendrobiology, 2015, v. 73, p. 145, doi. 10.12657/denbio.073.015

By:

Läänelaid, Alar;
Helama, Samuli;
Eckstein, Dieter

Publication type:

Article

Regional climatic signals in Scots pine growth with insights into snow and soil associations.

Published in:

Dendrobiology, 2013, v. 70, p. 27, doi. 10.12657/denbio.070.003

By:

Helama, Samuli;
Mielikäinen, Kari;
Timonen, Mauri;
Herva, Hannu;
Tuomenvirta, Heikki;
Venäläinen, Ari

Publication type:

Article

A chronology of climatic downturns through the mid- and late-Holocene: tracing the distant effects of explosive eruptions from palaeoclimatic and historical evidence in northern Europe.

Published in:

Polar Research, 2013, v. 32, n. 1, p. 1, doi. 10.3402/polar.v32i0.15866

By:

Helama, Samuli;
Holopainen, Jari;
Macias-Fauria, Marc;
Timonen, Mauri;
Mielikäinen, Kari

Publication type:

Article

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

Published in:

Human Ecology: An Interdisciplinary Journal, 2009, v. 37, n. 2, p. 213, doi. 10.1007/s10745-009-9225-6

By:

Holopainen, Jari;
Helama, Samuli

Publication type:

Article

Dendroclimatic signals in Scots pine tree-ring chronologies in southwest Finland.

Published in:

Baltica, 2022, v. 35, n. 1, p. 37, doi. 10.5200/baltica.2022.1.3

By:

Helama, Samuli

Publication type:

Article

Climatic, weather and socio-economic conditions corresponding with the mid-17th century eruption cluster.

Published in:

Climate of the Past Discussions, 2021, p. 1, doi. 10.5194/cp-2021-148

By:

Stoffel, Markus;
Corona, Christophe;
Ludlow, Francis;
Sigl, Michael;
Huhtamaa, Heli;
Garnier, Emmanuel;
Helama, Samuli;
Guillet, Sébastien;
Crampsie, Arlene;
Kleemann, Katrin;
Camenisch, Chantal;
McConnell, Joseph;
Gao, Chaochao

Publication type:

Article

Recurrent transitions to Little Ice Age-like climatic regimes over the Holocene.

Published in:

Climate Dynamics, 2021, v. 56, n. 11/12, p. 3817, doi. 10.1007/s00382-021-05669-0

By:

Helama, Samuli;
Stoffel, Markus;
Hall, Richard J.;
Jones, Phil D.;
Arppe, Laura;
Matskovsky, Vladimir V.;
Timonen, Mauri;
Nöjd, Pekka;
Mielikäinen, Kari;
Oinonen, Markku

Publication type:

Article

Expressing Tree-Ring Chronology as Age-Standardized Growth Measurements.

Published in:

Forest Science, 2015, v. 61, n. 5, p. 817, doi. 10.5849/forsci.14-139

By:

Helama, Samuli

Publication type:

Article

Summer 2024 in northern Fennoscandia was very likely the warmest in 2000 years.

Published in:

NPJ Climate & Atmospheric Science, 2025, v. 8, n. 1, p. 1, doi. 10.1038/s41612-025-01046-4

By:

Rantanen, Mika;
Helama, Samuli;
Räisänen, Jouni;
Gregow, Hilppa

Publication type:

Article

Åland churches as archives of tree-ring records sensitive to fluctuating climate.

Published in:

Acta Palaeobotanica, 2019, v. 59, n. 1, p. 131, doi. 10.2478/acpa-2019-0002

By:

Helama, Samuli;
Bartholin, Thomas S.

Publication type:

Article

Limited Late Antique cooling.

Published in:

Nature Geoscience, 2017, v. 10, n. 4, p. 242, doi. 10.1038/ngeo2926

By:

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

Publication type:

Article

Tricentennial trends in spring ice break-ups on three rivers in northern Europe.

Published in:

Cryosphere, 2022, v. 16, n. 7, p. 2881, doi. 10.5194/tc-16-2881-2022

By:

Norrgård, Stefan;
Helama, Samuli

Publication type:

Article

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

Published in:

Progress in Physical Geography: Earth & Environment, 2012, v. 36, n. 2, p. 187, doi. 10.1177/0309133311434243

By:

Helama, Samuli;
Hyttinen, Outi;
Salonen, Veli-Pekka

Publication type:

Article

Crop yield responses to temperature fluctuations in 19th century Finland: provincial variation in relation to climate and tree-rings.

Published in:

Boreal Environment Research, 2015, v. 20, n. 6, p. 707

By:

Huhtamaa, Heli;
Helama, Samuli;
Holopainen, Jari;
Rethorn, Carolin;
Rohr, Christian

Publication type:

Article

Finnish supra-long tree-ring chronology extended to 5634 BC.

Published in:

Norwegian Journal of Geography, 2008, v. 62, n. 4, p. 271, doi. 10.1080/00291950802517593

By:

Helama, Samuli;
Mielikäinen, Kari;
Timonen, Mauri;
Eronen, Matti

Publication type:

Article

An Overview of Climate Variability in Finland During the Common Era.

Published in:

Geophysica, 2017, v. 52, n. 1, p. 3

By:

Helama, Samuli

Publication type:

Article

Reconstruction of precipitation variability in Estonia since the eighteenth century, inferred from oak and spruce tree rings.

Published in:

Climate Dynamics, 2018, v. 50, n. 11/12, p. 4083, doi. 10.1007/s00382-017-3862-z

By:

Helama, Samuli;
Sohar, Kristina;
Läänelaid, Alar;
Bijak, Szymon;
Jaagus, Jaak

Publication type:

Article

Ernest Hemingway's description of the Mountaintop in "The Snows of Kilimanjaro" and Climate Change Research.

Published in:

Hemingway Review, 2015, v. 34, n. 2, p. 118, doi. 10.1353/hem.2015.0014

By:

Helama, Samuli

Publication type:

Article

Dendroclimatic signals deduced from riparian versus upland forest interior pines in North Karelia, Finland.

Published in:

Ecological Research, 2013, v. 28, n. 6, p. 1019, doi. 10.1007/s11284-013-1084-3

By:

Helama, Samuli;
Arentoft, Birgitte W.;
Collin-Haubensak, Olivier;
Hyslop, Michael D.;
Brandstrup, Charlotte K.;
Mäkelä, Hanna M.;
Tian, QinHua;
Wilson, Rob

Publication type:

Article

Analysis of reconstructed annual precipitation from tree-rings for the past 500 years in the middle Qilian Mountain.

Published in:

SCIENCE CHINA Earth Sciences, 2012, v. 55, n. 5, p. 770, doi. 10.1007/s11430-012-4375-6

By:

Tian, QinHua;
Zhou, XiuJi;
Gou, XiaoHua;
Zhao, Ping;
Fan, ZeXin;
Helama, Samuli

Publication type:

Article

The 4.2 ka event: A review of palaeoclimate literature and directions for future research.

Published in:

Holocene, 2024, v. 34, n. 9, p. 1408, doi. 10.1177/09596836241254486

By:

Helama, Samuli

Publication type:

Article

Solar-type periodicities in the climate variability of Northern Fennoscandia during the last three centuries: Real influence of solar activity or natural instability in the climate system.

Published in:

Holocene, 2022, v. 32, n. 3, p. 99, doi. 10.1177/09596836211060487

By:

Ogurtsov, Maxim;
Helama, Samuli;
Jalkanen, Risto;
Jungner, Högne;
Lindholm, Markus;
Veretenenko, Svetlana

Publication type:

Article

Historical trends in spring ice breakup for the Aura River in Southwest Finland, AD 1749–2018.

Published in:

Holocene, 2019, v. 29, n. 6, p. 953, doi. 10.1177/0959683619831429

By:

Norrgård, Stefan;
Helama, Samuli

Publication type:

Article

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

Published in:

Holocene, 2017, v. 27, n. 10, p. 1600, doi. 10.1177/0959683617693898

By:

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

Publication type:

Article

Regional curve standardization: State of the art.

Published in:

Holocene, 2017, v. 27, n. 1, p. 172, doi. 10.1177/0959683616652709

By:

Helama, Samuli;
Melvin, Thomas M.;
Briffa, Keith R.

Publication type:

Article

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

Published in:

Holocene, 2017, v. 27, n. 1, p. 3, doi. 10.1177/0959683616646188

By:

Huhtamaa, Heli;
Helama, Samuli

Publication type:

Article

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

Published in:

Journal of Animal Ecology, 2009, v. 78, n. 6, p. 1226, doi. 10.1111/j.1365-2656.2009.01598.x

By:

Helle, Samuli;
Helama, Samuli;
Lertola, Kalle

Publication type:

Article

Dendroclimatic investigations and cross-dating in the 1700s: the tree-ring investigations of Johan Leche (1704–1764) in southwestern Finland.

Published in:

Canadian Journal of Forest Research, 2021, v. 51, n. 2, p. 267, doi. 10.1139/cjfr-2020-0182

By:

Norrgård, Stefan;
Helama, Samuli

Publication type:

Article

Nonoverlapping Magisteria Versus Science-Religion Integration: Rereading Stephen Jay Gould.

Published in:

Theology & Science, 2024, v. 22, n. 2, p. 393, doi. 10.1080/14746700.2024.2351648

By:

Helama, Samuli

Publication type:

Article

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

Published in:

Journal of Oceanography, 2008, v. 64, n. 6, p. 951, doi. 10.1007/s10872-008-0078-1

By:

Nielsen, Jan Kresten;
Helama, Samuli;
Schöne, Bernd

Publication type:

Article

Finnish National Phenological Network 1997–2017: from observations to trend detection.

Published in:

International Journal of Biometeorology, 2020, v. 64, n. 10, p. 1783, doi. 10.1007/s00484-020-01961-6

By:

Helama, Samuli;
Tolvanen, Anne;
Karhu, Jouni;
Poikolainen, Jarmo;
Kubin, Eero

Publication type:

Article

Does diurnal temperature range influence seasonal suicide mortality? Assessment of daily data of the Helsinki metropolitan area from 1973 to 2010.

Published in:

International Journal of Biometeorology, 2014, v. 58, n. 6, p. 1039, doi. 10.1007/s00484-013-0689-0

By:

Holopainen, Jari;
Helama, Samuli;
Partonen, Timo

Publication type:

Article

Plant phenological records in northern Finland since the 18th century as retrieved from databases, archives and diaries for biometeorological research.

Published in:

International Journal of Biometeorology, 2013, v. 57, n. 3, p. 423, doi. 10.1007/s00484-012-0568-0

By:

Holopainen, Jari;
Helama, Samuli;
Lappalainen, Hanna;
Gregow, Hilppa

Publication type:

Article

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

Published in:

International Journal of Earth Sciences, 2007, v. 96, n. 3, p. 525, doi. 10.1007/s00531-006-0109-3

By:

Schöne, Bernd;
Page, Nicholas;
Rodland, David;
Fiebig, Jens;
Baier, Sven;
Helama, Samuli;
Oschmann, Wolfgang

Publication type:

Article

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

Published in:

Climatic Change, 2009, v. 92, n. 1/2, p. 213, doi. 10.1007/s10584-008-9477-y

By:

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

Publication type:

Article

Transient Offset in <sup>14</sup>C After the Carrington Event Recorded by Polar Tree Rings.

Published in:

Geophysical Research Letters, 2024, v. 51, n. 5, p. 1, doi. 10.1029/2023GL106632

By:

Uusitalo, Joonas;
Golubenko, Kseniia;
Arppe, Laura;
Brehm, Nicolas;
Hackman, Thomas;
Hayakawa, Hisashi;
Helama, Samuli;
Mizohata, Kenichiro;
Miyake, Fusa;
Mäkinen, Harri;
Nöjd, Pekka;
Tanskanen, Eija;
Tokanai, Fuyuki;
Rozanov, Eugene;
Wacker, Lukas;
Usoskin, Ilya;
Oinonen, Markku

Publication type:

Article

DEVELOPING MILLENNIAL TREE-RING CHRONOLOGY FOR TURKU (ÅBO) AND COMPARING PALAEOCLIMATIC SIGNALS INFERRED FROM ARCHAEOLOGICAL, SUBFOSSIL AND LIVING PINUS SYLVESTRIS DATA IN SOUTHWEST FINLAND.

Published in:

Studia Quaternaria, 2024, v. 41, n. 1, p. 1, doi. 10.24425/sq.2024.149969

By:

Helama, Samuli;
Ratilainen, Tanja;
Ruohonen, Juha;
Taavitsainen, Jussi-Pekka

Publication type:

Article

An 854-Year Tree-Ring Chronology of Scots Pine for South-West Finland.

Published in:

Studia Quaternaria, 2014, v. 31, n. 1, p. 61, doi. 10.2478/squa-2014-0006

By:

Helama, Samuli;
Holopainen, Jari;
Timonen, Mauri;
Mielikäinen, Kari

Publication type:

Article

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

Published in:

American Journal of Human Biology, 2007, v. 19, n. 6, p. 844, doi. 10.1002/ajhb.20650

By:

Helle, Samuli;
Helama, Samuli

Publication type:

Article

Centennial-to-millennial fluctuations in July temperatures in North Finland as recorded by timberline tree rings of Scots pine

Published in:

Quaternary Research, 2005, v. 63, n. 2, p. 182, doi. 10.1016/j.yqres.2004.11.001

By:

Ogurtsov, Maxim;
Helama, Samuli;
Eronen, Matti;
Lindholm, Markus

Publication type:

Article

Growth characteristics of the endangered thick-shelled river mussel (Unio crassus) near the northern limit of its natural range.

Published in:

Aquatic Conservation, 2017, v. 27, n. 2, p. 476, doi. 10.1002/aqc.2698

By:

Helama, Samuli;
Valovirta, Ilmari;
Nielsen, Jan Kresten

Publication type:

Article