Samuli Helama

Senior Scientist

Phone number +358295325047
Email address samuli.helama(at)luke.fi
Address Ounasjoentie 6 96200 ROVANIEMI

Limited Late Antique cooling

Refereed scientific publications

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2017

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

Refereed scientific publications

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2017

Rereading a tree-ring database to illustrate depositional histories of subfossil trees

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2017

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

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2017

Regional curve standardization: State of the art

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2017

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

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2017

Assessments of diameter growth and optimal rotation length for even-aged spruce sites in Estonia

Refereed scientific publications

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2016

Subfossil peatland trees as proxies for Holocene palaeohydrology and palaeoclimate

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2016

Coexisting responses in tree-ring δ13 C to high-latitude climate variability under elevated CO2: A critical examination of climatic effects and systematic discrimination rate changes

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2016

Contrasting tree-ring growth response of Picea abies to climate variability in western and eastern Estonia

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2016

Oak decline as illustrated through plant-climate interactions near the northern edge of species range

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2016

Last millenium northern hemisphere summer temperatures from tree rings: Part I: The long term context

Refereed scientific publications

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2016

Inter- and intra-seasonal effects of temperature variation on radial growth of alpine treeline Norway spruce

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2016

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

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2016

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

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2016

Old World megadroughts and pluvials during the Common Era

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2015

LA-ICP-MS-derived U-concentrations and microstructural domains within biogenic aragonite of Arctica islandica shell

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2015

Expressing tree-ring chronology as age-standardized growth measurements

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2015

Age-related trends in subfossil tree-ring δ13C data

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2015

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

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2015

The historical time frame (past 1000 years)

Other publications

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2015

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

Refereed scientific publications

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2015

Ernest Hemingway's description of the mountaintop in "The snows of Kilimanjaro" and climate change research

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2015

Suicide mortality in European countries and Post-Soviet states since 1955: Illustrating the longtime trends and patterns of recent changes

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2015