Volcanic eruptions and cold summers leave lasting marks in the wood of northern trees, unlocking the secrets of past climate extremes.

those trees have similar tree-ring patterns. By starting with a living tree and using wooden objects of different ages, dendrochronologists can work back through time and create a continuous plot ...

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The scientists collected core samples from 25 Scots pine trees and stem discs from 54 juniper shrubs, creating paper-thin ...

Blue growth rings in woody plant stems indicate years when cells failed to lignify properly due to summers that were too cold ...

Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth ...

In Norway, scientists have found blue rings in trees that hint at how volcanic eruptions disrupted growth throughout history.

carbon isotopes in the growth rings of trees. Her team dissected tree rings from ancient wood samples, burned the cellulose — the main component of wood — to determine the radiocarbon content ...

Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth don’t lignify properly, creating ‘blue rings’ that appear when wood samples ...

Well, tree-ring dating, or dendrochronology, can be this precise, and even more so. Dendrochronologists showed that an ancient wooden road uncovered in southwestern England not only was built in ...

creating ‘blue rings’ that appear when wood samples are dyed. Since trees and shrubs can live for hundreds of years, identifying these blue rings allows us to spot cold summers in the past.