Common Era treeline fluctuations and their implications for climate reconstructions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F22%3A00565127" target="_blank" >RIV/86652079:_____/22:00565127 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/22:00128289

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0921818122002466?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921818122002466?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gloplacha.2022.103979" target="_blank" >10.1016/j.gloplacha.2022.103979</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Common Era treeline fluctuations and their implications for climate reconstructions

Popis výsledku v původním jazyce

Two hundred years after von Humboldt's pioneering work on the upper treeline, and many fundamental studies thereafter, the rate of past elevational changes in one of the most fascinating biogeographic boundaries on our planet remains poorly understood. Here, we distinguish conceptually between realised and potential treeline positions and present an ensemble model approach to simulate mean elevational treeline fluctuations for the past 2000 years. Based on dendrochronological summer temperature records, our simple, though efficient model shows that alpine treelines across the Northern Hemisphere were, on average, about 45-50 m higher after the Roman and medieval warm periods compared to their lowest mean position in the 1760s, which likely reflects the accumulated effects of repeated cold spells during the Little Ice Age. We suggest that the simulated mean differences between realised and potential treeline positions can affect the amplitude and variance of tree ring-based temperature reconstructions. Contrary to common belief, we also argue that the current offset between lower realised and much higher potential treeline positions, which appears unprecedented in the past two millennia, does not account for the yet unexplained 'Divergence Problem' in dendroclimatology, a decoupling between increasing temperature measurements and tree-ring chronologies since the 1970s.

Název v anglickém jazyce

Common Era treeline fluctuations and their implications for climate reconstructions

Popis výsledku anglicky

Two hundred years after von Humboldt's pioneering work on the upper treeline, and many fundamental studies thereafter, the rate of past elevational changes in one of the most fascinating biogeographic boundaries on our planet remains poorly understood. Here, we distinguish conceptually between realised and potential treeline positions and present an ensemble model approach to simulate mean elevational treeline fluctuations for the past 2000 years. Based on dendrochronological summer temperature records, our simple, though efficient model shows that alpine treelines across the Northern Hemisphere were, on average, about 45-50 m higher after the Roman and medieval warm periods compared to their lowest mean position in the 1760s, which likely reflects the accumulated effects of repeated cold spells during the Little Ice Age. We suggest that the simulated mean differences between realised and potential treeline positions can affect the amplitude and variance of tree ring-based temperature reconstructions. Contrary to common belief, we also argue that the current offset between lower realised and much higher potential treeline positions, which appears unprecedented in the past two millennia, does not account for the yet unexplained 'Divergence Problem' in dendroclimatology, a decoupling between increasing temperature measurements and tree-ring chronologies since the 1970s.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10510 - Climatic research

Projekt

<a href="/cs/project/EF16_019%2F0000797" target="_blank" >EF16_019/0000797: SustES - Adaptační strategie pro udržitelnost ekosystémových služeb a potravinové bezpečnosti v nepříznivých přírodních podmínkách</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Global and Planetary Change

ISSN

0921-8181

e-ISSN

1872-6364

Svazek periodika

219

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

103979

Kód UT WoS článku

000887097400001

EID výsledku v databázi Scopus

2-s2.0-85141526676