The Wooster Tree Ring Lab is part of the international tree-ring community, that investigated the global extent and seasonal timing of the rapid increase in atmospheric 14C concentrations from the two largest cosmogenic events in 774 and 993 CE. The initiative named “COSMIC” is lead by Ulf Büntgen (Cambridge University), Lukas Wacker, and J. Diego Galván (Swiss Federal Research Institute WSL) and measured these two cosmogenic events in 44 of the world’s longest tree-ring chronologies. These events are now key marker years and a powerful dating tool. The study was published in Nature Communication and can be found here.
Results of fieldwork in Glacier Bay National Park and Preserve by collaborators from Lamont-Doherty Earth Observatory and University of Alaska – Fairbanks are described here in this excellent blog. This narrative is written by scientist, author and collaborator on the project Lauren Oakes. Lauren is also author of a forthcoming book on Alaska Cedar Decline and Climate.
Summer 2018 research in the Tree Ring Lab has come to a close. The group of five students worked on a variety of projects, learning about the climate and history of Ohio and Alaska, and the application of different dendrochronological techniques and statistical analyses. They also gained experience effectively conveying their research to others and writing official reports of their findings.
The summer research team on their last day working together (Left to right: Greg Wiles, Nick Wiesenberg, Victoria Race ’19, Juwan Shabazz ’19, Kendra Devereux ’21, Josh Charlton ’19, and Alexis Lanier ’20).
AMRE students with a sampled oak tree at Brown’s Lake Bog in Wooster, Ohio (Alexis Lanier ’20, Juwan Shabazz ’19, and Kendra Devereux ’21).
The AMRE team accomplished a lot during the eight weeks they were here on campus. Their research started with the principles of dendrochronology, when they learned how to count individual tree rings and measure their widths under the microscopes. From here, the team learned how to run this data in different programs like COFECHA and ARSTAN. This process allowed them to date many historical structures across Northeast Ohio such as Gingery Barn and Miller House and Barn. You can find a full list on the TRL’s reports page.
AMRE students with
Two alumni of the Wooster Tree Ring Lab and Wooster Geology, Clara Deck (’17, now at the University of Maine studying ice sheets) and Sarah Frederick (’15, now at The University of Arizona studying drought and streamflow) together with Greg and Nick, and colleagues in the US and Russia published a new study on tree growth and climate in Kamchatka, Fareast Russia. This is part of a special edition of the Journal Forests. The group has donated the data in to the International Tree Ring Databank.
Photo below shows some of the coauthors at the base of Tobalchik Volcano on the Kamchatka Peninsula.
I recently had the pleasure to work with a team of ecologists for eight days in Glacier Bay National Park and Preserve. The point of the trip was to reoccupy and expand investigations of the Cooper Plots established over 100 years ago in the wake of the retreating ice in the West Arm. A nice rundown of this ecological succession work is presented here on Glacier Hub. The ecology team recently published on their rediscovery of the plots, which was heroic considering the immense lands, intense brush and sometimes cryptic description of the plot locations.
The accommodations and views in the West Arm of Glacier Bay were spectacular. Logistics of the project were supported by the National Park Service, who we gratefully acknowledge.
The team of ecologists included (left to right) Drs. Allison Bidlack (Director, Alaska Coastal Rainforest Center, University of Alaska Southeast), Sarah Bisbing (University of Nevada – Reno) and Brian Buma (University of Alaska Southeast). I was along to core trees at the sites (Wooster Tree Ring Lab) and to measure the size of alders.
Sarah and Brian cordon off one of Cooper’s 1-meter plots with string so we don’t trample the vegetation. Sarah reals out a 15-meter tape with Allison on……
The high rainfall and high coastal ranges nourish the icefields of southern Alaska along and with the extensive carbon-rich forests and ecosystems of the Northern Pacific Coastal Temperate Rainforest (PCTR).
Chris surveys the North Pacific noting the extensive moisture source and ocean pasture that is just offshore of the terrestrial ecosystems we are studying.
Malisse sits atop a shore pine, another slow growing coastal species that is experiencing potential decline.
Kerensa sites atop an obducted ophiolite – we were 71% sure that there were pillows in the basalt.
Josh cores another Alaska Yellow cedar – we were able to sample three sites in the Juneau area. These cedars are in decline due to warming and loss of snowpack, which makes their fine roots vulnerable to frost. Our objective is to work up the tree-ring record of the sites to contribute to our understanding of the decline.
Alora takes a break from taking notes and GPS coordinates for each tree.
Ice caves fund to explore and act as a conduit to meltwater and warm air accelerating the melt.
Blue the dog – takes a break from pursuing porcupines in the muskeg.
Nick of the Ophiolite.
Kerensa wades through the deep texture of coastal carbon.
Buried forests emerge from the wasting margin of……..