Tree Ring Articles & Analysis
18 news found
Sidewalls are used as weights for livestock feed storage coverings such as silage, haylage, or corn, weights for highway construction traffic drums, and mulch rings for newly planted trees. Once you remove the sidewall, the treads can be flattened and used as bumpers for loading docks or boat docks and matting for livestock ...
The authors of a study published in the journal Science Advances looked at evidence from tree rings in the US Southwest and the Central Plains, and then tested the hypothesis they developed with 17 different climate models. ...
The lead author, Fredrik Charpentier Ljungqvist, a historian and climate researcher at Stockholm University, says: “Despite strong 20th-century warming, we find that rainfall and drought extremes in the 20th century have varied within the natural variability we can now see in earlier centuries. The team used tree-rings, lake sediment, historical data and ...
” She and her co-author Ben Cook, of the US space agency Nasa and the Lamont-Doherty Earth Observatory at Columbia University in New York, report in Nature Climate Change that they pored over harvest records and tree ring measurements dating back to 1600, and vintage statistics and instrument measurements throughout the 20th century. ...
The study considered variability and trends in harvest dates, climate data from instruments during the 20th century, and reconstructions from historical documents and tree rings of temperature, precipitation and soil moisture dating back to 1600. ...
The 45 scientists, from 13 countries, say their research now puts the current warmth in the context of the last 2,100 years, using tree-ring information and historical documentary evidence. Their interdisciplinary study involved the collaboration of researchers from Past Global Changes (PAGES), a core project of the global sustainability science programme, Future ...
The research is a joint effort of a group of 45 scientists from 13 countries, including a JRC expert. They used tree-ring information and historical documentary evidence to reconstruct European summer temperatures from 138 Before Common Era (BCE) to date. ...
From so-called proxy data – gathered from ice-cores, tree-rings, coral, and ocean and lake sediments – temperatures can be reconstructed for more than a millennium back in time. ...
But the tree populations are under threat. “We found no frankincense trees younger than half a century”, says Motuma Tolera Feyissa, who defended his PhD thesis on this subject yesterday. ...
Using data on soil water holding capacity, temperature and precipitation, the researchers calculated a soil water deficit index at the two sites to represent the effects of drought. This index was then related to tree-ring width and the presence of stable carbon and oxygen isotopes in tree rings. Analysis of the concentration of ...
Because of its location in an area of environmental and recreational value, impacts on nature and landscape were addressed through mitigation and compensation measures, covering recreational use of areas around the quarry (e.g. through changes in the pathway systems and planting of trees). Reconstruction of a Ring Road in Poland: The construction project ...
Africa's severe land degradation could be reversed by private sector investment in tree-based restoration technologies, a meeting heard. Poor agricultural practices and deforestation are some of the causes of land degradation, which has led to a massive loss of biodiversity on the continent, experts said at the international investment forum Mobilising Private Investment in ...
The bony structures fish use for orientation and detection of movement – called otoliths – have annual growth rings which were measured for changes. Similar to growth rings in trees, they can be counted to indicate a fish’s age and annual growth rate, estimated by measuring distances between each new ring. ...
A report by an international Science Assessment Panel requested by the UEA found “no evidence of any deliberate scientific malpractice in any of the work” and “that the CRU tree-ring work has been carried out with integrity, and that allegations of deliberate misrepresentation and unjustified selection of data are not ...
Seager and his coauthors Alexandrina Tzanova and Jennifer Nakamura put the period in context by comparing it with instrumental weather records from the last century and studies of tree-growth rings, which vary according to rainfall, for the last 1,000 years. ...
As changing sea levels are associated with surface temperatures, the researchers reconstructed sea levels over the past 2000 years and linked those levels to global temperatures (estimated from evidence found in the annual growth rings of trees and ice core data). This extended time span helps improve the model's predictions and allow future projections of SLR ...
Current methods can lead to overestimates of a tree's age. Trees respond to seasonal floods by becoming dormant and these growth pauses form clear tree-ring boundaries in the wood. ...
The same conclusion holds back to A.D. 300 if the researchers include tree-ring data. One of the reasons that including tree-ring data in these studies raises possible concerns is something called the 'segment length curse.' This 'curse' occurs because trees put on rings every year, but older ...