Consistent summer temperature signals in a latewood blue intensity network from the upper tree line in the Caucasus

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10499411" target="_blank" >RIV/00216208:11310/25:10499411 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=SV1hYKlZ44" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=SV1hYKlZ44</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.dendro.2025.126372" target="_blank" >10.1016/j.dendro.2025.126372</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Consistent summer temperature signals in a latewood blue intensity network from the upper tree line in the Caucasus

Popis výsledku v původním jazyce

Climate variability in the Caucasus region significantly influences tree growth in alpine tree line ecotones. However, long-standing human land-use history disrupted the natural equilibrium between montane forests and alpine meadows. These complex vegetation dynamics may cause traditional proxies such as tree-ring width (TRW) to display a weak climate signal, limiting their utility for understanding growth-climate relationships. To address these challenges, we established a multispecies network of seven tree ring width index (TRWI) and seven latewood blue intensity (LWBI) chronologies from three coniferous species (Picea orientalis, Abies nordmanniana and Pinus sylvestris) at current tree line sites (1900-2300 masl) in the Greater and Lesser Caucasus. Our results show that almost all the LWBI site chronologies demonstrate consistent and stable correlation with summer temperature (June-August). In contrast, corresponding TRWI chronologies reveal much weaker correlations with temperature, mainly with previous winter and spring. TRWI moderately responds to precipitation during the summer (JJA) while LWBI does not show any significant response to precipitation. The weaker and less consistent temperature signals in TRWI chronologies suggest additional influence of precipitation, non-climatic factors and local disturbance events on TRWI. Principal component analysis reveals a robust common signal in the LWBI network. First principal components from both proxies correlate with summer temperatures, although correlation is much higher for LWBI than for TRWI. The stable and consistent relationship between LWBI and summer temperature in different frequency domains indicates high potential of this proxy for annually resolved climate reconstructions at a regional level, which would be new for the Lesser Caucasus region.

Název v anglickém jazyce

Consistent summer temperature signals in a latewood blue intensity network from the upper tree line in the Caucasus

Popis výsledku anglicky

Climate variability in the Caucasus region significantly influences tree growth in alpine tree line ecotones. However, long-standing human land-use history disrupted the natural equilibrium between montane forests and alpine meadows. These complex vegetation dynamics may cause traditional proxies such as tree-ring width (TRW) to display a weak climate signal, limiting their utility for understanding growth-climate relationships. To address these challenges, we established a multispecies network of seven tree ring width index (TRWI) and seven latewood blue intensity (LWBI) chronologies from three coniferous species (Picea orientalis, Abies nordmanniana and Pinus sylvestris) at current tree line sites (1900-2300 masl) in the Greater and Lesser Caucasus. Our results show that almost all the LWBI site chronologies demonstrate consistent and stable correlation with summer temperature (June-August). In contrast, corresponding TRWI chronologies reveal much weaker correlations with temperature, mainly with previous winter and spring. TRWI moderately responds to precipitation during the summer (JJA) while LWBI does not show any significant response to precipitation. The weaker and less consistent temperature signals in TRWI chronologies suggest additional influence of precipitation, non-climatic factors and local disturbance events on TRWI. Principal component analysis reveals a robust common signal in the LWBI network. First principal components from both proxies correlate with summer temperatures, although correlation is much higher for LWBI than for TRWI. The stable and consistent relationship between LWBI and summer temperature in different frequency domains indicates high potential of this proxy for annually resolved climate reconstructions at a regional level, which would be new for the Lesser Caucasus region.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

<a href="/cs/project/EH22_008%2F0004605" target="_blank" >EH22_008/0004605: Přírodní a antropogenní georizika</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Dendrochronologia

ISSN

1125-7865

e-ISSN

1612-0051

Svazek periodika

92

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

11

Strana od-do

126372

Kód UT WoS článku

001502628900003

EID výsledku v databázi Scopus

2-s2.0-105006772517