Sub‐Seasonal Tree‐Ring Reconstructions for More Comprehensive Climate Records in U.S. West Coast Watersheds

2020 ◽  
Author(s):  
Erika K. Wise
Keyword(s):  
Tree Ring ◽  
West Coast ◽  
Climate Records

scholarly journals Simulation of tree ring-widths with a model for primary production, carbon allocation and growth

2014 ◽  
Vol 11 (7) ◽  
pp. 10451-10485 ◽  
Author(s):  
G. Li ◽  
S. P. Harrison ◽  
I. C. Prentice ◽  
D. Falster
Keyword(s):  
Primary Production ◽  
Interannual Variability ◽  
Tree Ring ◽  
Photosynthetically Active Radiation ◽  
Ring Width ◽  
Negative Response ◽  
Pinus Koraiensis ◽  
Local Climate ◽  
Active Radiation ◽  
Climate Records

Abstract. We present a simple, generic model of annual tree growth, called "T". This model accepts input from a first-principles light-use efficiency model (the P model). The P model provides values for Gross Primary Production (GPP) per unit of absorbed photosynthetically active radiation (PAR). Absorbed PAR is estimated from the current leaf area. GPP is allocated to foliage, transport-tissue, and fine root production and respiration, in such a way as to satisfy well-understood dimensional and functional relationships. Our approach thereby integrates two modelling approaches separately developed in the global carbon-cycle and forest-science literature. The T model can represent both ontogenetic effects (impact of ageing) and the effects of environmental variations and trends (climate and CO2) on growth. Driven by local climate records, the model was applied to simulate ring widths during 1958–2006 for multiple trees of Pinus koraiensis from the Changbai Mountain, northeastern China. Each tree was initialised at its actual diameter at the time when local climate records started. The model produces realistic simulations of the interannual variability in ring width for different age cohorts (young, mature, old). Both the simulations and observations show a significant positive response of tree-ring width to growing-season total photosynthetically active radiation (PAR0) and the ratio of actual to potential evapotranspiration (α), and a significant negative response to mean annual temperature (MAT). The slopes of the simulated and observed relationships with PAR0 and α are similar; the negative response to MAT is underestimated by the model. Comparison of simulations with fixed and changing atmospheric CO2 concentration shows that CO2 fertilization over the past 50 years is too small to be distinguished in the ring-width data given ontogenetic trends and interannual variability in climate.

Detection of high-wind events using tree-ring data

2011 ◽  
Vol 41 (5) ◽  
pp. 1121-1129 ◽  
Author(s):  
Keith S. Hadley ◽  
Paul A. Knapp
Keyword(s):  
Pacific Northwest ◽  
Tree Ring ◽  
West Coast ◽  
Ring Width ◽  
Past Century ◽  
Decadal Climate Variability ◽  
High Wind ◽  
Tree Ring Data ◽  
Wind Events

Windstorms are common events in midlatitude west coast climates yet little is known about their long-term history and influence on regional forests. In this paper, we present a procedure that detects the timing and frequency of these high-wind events (HWEs) along the Pacific Northwest coast of North America using crossdated tree-ring measurements and detrended tree-ring chronologies derived from windsnapped trees. Our results show that abrupt changes in ring width patterns closely match dates of known HWEs and can serve as a nonclimatic basis for crossdating. Experimentation with different growth suppression and release criteria revealed that either a 50% decrease or a 50% increase in radial growth relative to the mean index value provided the best criterion for detecting windstorm-related growth anomalies. Comparing these results with the known occurrence of windstorms during the past century successfully identified all known major wind events during the study period. Low correlations between tree growth and climatic variables further imply that HWEs are the principal cause of interannual growth variations. Accordingly, we discuss the application of our procedure toward the development of a multicentury reconstruction of HWEs, a long-term analysis of decadal climate variability and HWEs, and the ecological role of HWEs in Pacific Northwest and other west coast forests.

scholarly journals Simulation of tree-ring widths with a model for primary production, carbon allocation, and growth

2014 ◽  
Vol 11 (23) ◽  
pp. 6711-6724 ◽  
Author(s):  
G. Li ◽  
S. P. Harrison ◽  
I. C. Prentice ◽  
D. Falster
Keyword(s):  
Primary Production ◽  
Interannual Variability ◽  
Tree Ring ◽  
Photosynthetically Active Radiation ◽  
Ring Width ◽  
Negative Response ◽  
Pinus Koraiensis ◽  
Local Climate ◽  
Active Radiation ◽  
Climate Records

Abstract. We present a simple, generic model of annual tree growth, called "T". This model accepts input from a first-principles light-use efficiency model (the "P" model). The P model provides values for gross primary production (GPP) per unit of absorbed photosynthetically active radiation (PAR). Absorbed PAR is estimated from the current leaf area. GPP is allocated to foliage, transport tissue, and fine-root production and respiration in such a way as to satisfy well-understood dimensional and functional relationships. Our approach thereby integrates two modelling approaches separately developed in the global carbon-cycle and forest-science literature. The T model can represent both ontogenetic effects (the impact of ageing) and the effects of environmental variations and trends (climate and CO2) on growth. Driven by local climate records, the model was applied to simulate ring widths during the period 1958–2006 for multiple trees of Pinus koraiensis from the Changbai Mountains in northeastern China. Each tree was initialised at its actual diameter at the time when local climate records started. The model produces realistic simulations of the interannual variability in ring width for different age cohorts (young, mature, and old). Both the simulations and observations show a significant positive response of tree-ring width to growing-season total photosynthetically active radiation (PAR0) and the ratio of actual to potential evapotranspiration (α), and a significant negative response to mean annual temperature (MAT). The slopes of the simulated and observed relationships with PAR0 and α are similar; the negative response to MAT is underestimated by the model. Comparison of simulations with fixed and changing atmospheric CO2 concentration shows that CO2 fertilisation over the past 50 years is too small to be distinguished in the ring-width data, given ontogenetic trends and interannual variability in climate.

West coast problem.

1959 ◽  
Vol 14 (9) ◽  
pp. 596-597
Author(s):  
Francis H. Palmer
Keyword(s):  
West Coast
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