Tree ring dating and climate change Web camera sweden errotik
A tree ring consists of two layers: At locations where tree growth is limited by water availability, trees will produce wider rings during wet and cool years than during hot and dry years and the rings are wider.
Drought or a severe winter can cause narrower rings too.
Trees in temperate latitudes have annual spurts of growth in the summer and periods of dormancy in the winter, which creates the distinctive pattern of light and dark bands.
Tropical trees grow year-round, and thus do not have the alternating dark and light band pattern that allows us to read tree ring records.
Click on the links below to go to these activities Looking for online content that can be used for a climate change education course or module?
Pages linked below can be used to support an introductory climate change education for either a unit or a full..Leaders from 192 nations of the world are trying to make an agreement about how to limit emissions of heat-trapping greenhouse gases, mitigate climate change, and adapt to changing environmental conditions...Climate in your place on the globe is called regional climate.
Credit: National Oceanic and Atmospheric Administration Paleoclimatology Program/Department of Commerce.
We have developed two computer-based activities that allow you to experiment with some of the concepts related to dendrochronology.
For example, the data from a living, 200-year old tree could be combined with a data from wood from a tree that was felled 150 years ago (after living a couple of centuries) to produce a composite dataset spanning several hundred years.
Modern dendrochronologists seldom cut down a tree to analyze its rings.
Instead, core samples are extracted using a borer that's screwed into the tree and pulled out, bringing with it a straw-size sample of wood about 4 millimeters in diameter.
This map shows sites from which tree ring samples have been gathered.
Tree ring samples are collected in temperate zones where the trees have annual growth patterns that produce rings.