Professor Ulf Büntgen from the University of Cambridge, co-author of a study that used tree-ring data to find that 2023 was the hottest summer in the Northern Hemisphere in the past two thousand years , but the “instrumental evidence” only reaches back as far as the 19th century, while most temperature data has been limited to certain regions until more recently.
Tree rings contain “annually-resolved” and “absolutely-dated” information about past summer temperatures – as there is one ring a year and the width of that ring is determined by the temperature, with more growth in warmer temperatures. The researchers note that while their results are robust for the Northern Hemisphere, it is difficult to obtain global averages for the same period since data is sparse for the Southern Hemisphere.The researchers were able to look back over the past 2,000 years by integrating the nine longest temperature-sensitive tree-ring chronologies currently available.
Depending on their location and type, trees are a great proxy for temperature or rainfall conditions. Trees that depend heavily on temperature in the growing season will have narrow rings during cold periods and wider rings for warm periods.
Source: Entertainment Trends (entertainmenttrends.net)
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