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#treering

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Öffentlich
Ronald Visser

I have written a small R-script to download all tree-ring data from the ITRDB (measurements and chronologies). Anyone can create a local copy, just in case the data might not be available anymore from @noaa.gov

github.com/RonaldVisser/Downlo

Contribute to RonaldVisser/Download_ITRDB development by creating an account on GitHub.
GitHubGitHub - RonaldVisser/Download_ITRDBContribute to RonaldVisser/Download_ITRDB development by creating an account on GitHub.
#dendrochronology#treering#opendata
Fortgeführter Thread
Öffentlich *
anlomedad

"Forests moderate local climate by keeping their local environments cool. They do this partly by shading the land, but also by releasing moisture from their leaves. This process, called transpiration, requires energy, which is extracted from the surrounding air, thus cooling it. A single tree can transpire hundreds of liters of water in a day. Each hundred liters has a cooling effect equivalent to two domestic air conditioners for a day, calculates Ellison."

e360.yale.edu/features/how-def

It's now part of my new #Tegtmeier project: figure out how much eg. European and American land use change has impacted local, regional and continental weather. See above posting where I asked this question, too.

So I plot #treering widths alongside d18O from #speleothem (eg. stalagmite). Both proxies are precisely dated and (can) have annual resolution.

I would expect to see a warming =
trees grow more when, at locations from where "their weather comes", other forests are felled .
And a drying =
d18O increase in speleothems.

I use #GoogleEarth and my rudimentary history knowledge to determine certain locations in Australia, New Zealand, USA and Europe. tbc.🍿

Yale E360Rivers in the Sky: How Deforestation Is Affecting Global Water CyclesA growing body of evidence indicates that the continuing destruction of tropical forests is disrupting the movement of water in the atmosphere, causing major shifts in precipitation that could lead to drought in key agricultural areas in China, India, and the U.S. Midwest.  
#paleoclimate#ECS#climateModel
Öffentlich
arthurgessler

Recent human-induced atmospheric drying across Europe unprecedented in the last 400 years - combined #treering #18O analyses, Earth System model simulations and observations of the water vapour pressure deficit (#VPD) of the air show that this is due to #human influence. If the #atmosphere continues to #dry, impacts on natural ecosystem services, the #forestry and #agricultural sector and human #health are anticipated.

#climatechange #drought

nature.com/articles/s41561-023

www.nature.comRecent human-induced atmospheric drying across Europe unprecedented in the last 400 years | Nature GeoscienceThe vapor pressure deficit reflects the difference between how much moisture the atmosphere could and actually does hold, a factor that fundamentally affects evapotranspiration, ecosystem functioning, and vegetation carbon uptake. Its spatial variability and long-term trends under natural versus human-influenced climate are poorly known despite being essential for predicting future effects on natural ecosystems and human societies such as crop yield, wildfires, and health. Here we combine regionally distinct reconstructions of pre-industrial summer vapor pressure deficit variability from Europe’s largest oxygen-isotope network of tree-ring cellulose with observational records and Earth system model simulations with and without human forcing included. We demonstrate that an intensification of atmospheric drying during the recent decades across different European target regions is unprecedented in a pre-industrial context and that it is attributed to human influence with more than 98% probability. The magnitude of this trend is largest in Western and Central Europe, the Alps and Pyrenees region, and the smallest in southern Fennoscandia. In view of the extreme drought and compound events of the recent years, further atmospheric drying poses an enhanced risk to vegetation, specifically in the densely populated areas of the European temperate lowlands. The atmosphere has dried across most regions of Europe in recent decades, a trend that can be attributed primarily to human impacts, according to tree ring records spanning 400 years and Earth system model simulations.
Öffentlich
Ronald Visser

"Marking time.
Radiocarbon timestamps left in ancient tree rings by cosmic ray bombardments can date historical events with unprecedented precision"

This is a great read of how Miyake-events can be used to combine #dendrochronology and #14C for precise dating of historical events. The cosmic events lead to world wide records dated to a year.

science.org/content/article/ma

www.science.orgMarking time: Cosmic ray storms can pin precise dates on history from ancient Egypt to the VikingsAstronomical outbursts leave telltale carbon-14 spikes in tree rings
#archaeology#treering
Öffentlich
Ronald Visser

The list of #dendrochronologists on Mastodon is slowly growing.

Do you study #dendro #dendrochronology #treering #tree #growth #dendroecology #dendroprovenance or something else with tree rings?

Please go to: ronaldvisser.github.io/Mastodo
and add yourself using the form

It would be great to continue growing the dendro-community here :)

ronaldvisser.github.ioDendrochronologists on MastodonA list of Dendrochronologists in the Fediverse
Öffentlich *
Ronald Visser

Happy! Paper I wrote with Yardeni Vorst accepted! I received this message:

"I am pleased to inform you that the finalised version of your article entitled "Connecting ships: Using dendrochronological network analysis to determine the wood provenance of Roman-period river barges found in the Lower Rhine region and visualise wood use patterns" has now been accepted for publication in International Journal of Wood Culture. "

#archaeology#dendrochronology#tree
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