Tree ring dating powerpoint


24-Jan-2018 17:20

How unusual is this modern elevated rate of tree growth at high elevation?

Is this rate of growth unique in a multimillennial context?

Both an independent proxy record of temperature and high-elevation meteorological temperature data are positively and significantly correlated with upper-treeline ring width both before and during the high-growth interval.

Despite the challenges in using these natural archives of climate successfully, we argue that it is worthwhile to make considerable effort to achieve the best possible use of this concentration of long annual records.

Finally, we created a Great Basin regional upper-treeline chronology and compared it with both a density-based independent proxy record of temperature (22) and with modeled instrumental climate data (21).

Map of the study area shows locations of 3 upper forest border sites: Sheep Mountain, CA (SHP); Mt. The inset includes the other sites used in the White Mountains, CA elevational transect: Patriarch Lower (PAL), Cottonwood Lower (CWL), and Methuselah Walk (MWK) (contour intervals = 200 m).

The high growth is not overestimated because of standardization techniques, and it is unlikely that it is a result of a change in tree growth form or that it is predominantly caused by CO fertilization.

The growth surge has occurred only in a limited elevational band within ≈150 m of upper treeline, regardless of treeline elevation.

As a result, these high-elevation tree-ring series contain some information on moisture availability, but they also bear an important imprint of temperature variability, so that both types of signal may be present in records from the upper treeline (1–7).



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