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Keyword: dendroclimatology

Climatic drivers of ponderosa pine growth in central Idaho

Publications Posted on: December 04, 2018
Despite the widespread use of ponderosa pine as an important hydroclimate proxy, we actually understand very little about its climate response in the Northern Rockies. Here, we analyze two new ponderosa pine chronologies to investigate how climate influences annual growth.

Conifer radial growth response to recent seasonal warming and drought from the southwestern USA

Publications Posted on: April 10, 2018
Future droughts are expected to become more severe and frequent under future climate change scenarios, likely causing widespread tree mortality in the western USA. Coping with an uncertain future requires an understanding of long-term ecosystem responses in areas where prolonged drought is projected to increase. Tree-ring records are ideally suited for this task. We developed 24 tree-ring chronologies from 20 U.S.

Statistical treatment for the wet bias in tree-ring chronologies: A case study from the InteriorWest, USA

Publications Posted on: January 24, 2017
Dendroclimatic research has long assumed a linear relationship between tree-ring increment and climate variables. However, ring width frequently underestimates extremely wet years, a phenomenon we refer to as ‘wet bias’. In this paper, we present statistical evidence for wet bias that is obscured by the assumption of linearity.

Dendrochronology of Utah juniper

Science Spotlights Posted on: August 01, 2016
Annual precision of tree-ring data is often sought for detailed analyses. Important, widespread species such as ponderosa pine and Douglas-fir are often used for tree-ring science. However, there are other low elevation species, oftentimes termed woodland trees that could also be useful, including Utah juniper.

Building the Forest Inventory and Analysis tree-ring dataset

Science Spotlights Posted on: July 28, 2016
Tree-ring data collected as part of the Forest Inventory and Analysis program in the Interior West is being assembled into a massive dataset with many tens- of thousands of trees. Given the underlying sampling approach to the Forest Inventory and Analysis grid, the tree-ring data collected can be used for many novel research applications.

Dendrochronology of Utah Juniper (Juniperus osteosperma (Torr.) Little)

Publications Posted on: March 23, 2016
Utah juniper was a foundational species for the discipline of dendrochronology, having been used in the early 20th Century investigations of Mesa Verde, but has been largely ignored by dendrochronologists since. Here we present dendrochronological investigations of Utah juniper core and cross-sectional samples from four sites in northern Utah.

Building the Forest Inventory and Analysis Tree-Ring Data set

Publications Posted on: March 23, 2016
The Interior West Forest Inventory and Analysis (IW-FIA) program measures forestland conditions at great extent with relatively high spatial resolution, including the collection of tree-ring data. We describe the development of an unprecedented spatial tree-ring data set for the IW-FIA that enhances the baseline plot data by incorporating ring-width increment measured from increment cores collected on IW-FIA plots.

Forest inventory and analysis tree-ring data archive and analysis

Projects Posted on: January 22, 2015
The Interior West Forest Inventory and Analysis (FIA) Program collects increment cores as part of regular monitoring. Ring-widths from these increment cores are being digitized and assembled into data products for biogeographical or climatological analyses. 

Tree-ring reconstruction of the level of Great Salt Lake, USA

Publications Posted on: September 12, 2014
Utah's Great Salt Lake (GSL) is a closed-basin remnant of the larger Pleistocene-age Lake Bonneville. The modern instrumental record of the GSL-level (i.e. elevation) change is strongly modulated by Pacific Ocean coupled ocean/atmospheric oscillations at low frequency, and therefore reflects the decadalscale wet/dry cycles that characterize the region.

Old Black Hills ponderosa pines tell a story

Publications Posted on: May 04, 2006
A single ponderosa pine tree found in the central Black Hills of SouthDakota revealed its age of more than 700 years by its tree rings taken from coring in 1992. The purpose of this study was to examine historic climatic patterns from the 13th century through most of the 20th century as inferred from ring widths of this and other nearby trees.