# Southeastern Alaska Yellow-Cedar Decline Data
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#                World Data Service for Paleoclimatology, Boulder 
#                                  and 
#                     NOAA Paleoclimatology Program 
#             National Centers for Environmental Information (NCEI)
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# Template Version 3.0
# Encoding: UTF-8
# NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. 
# If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. 
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# Online_Resource: https://www.ncdc.noaa.gov/paleo/study/23055 
#       Description: NOAA Landing Page
# Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/treering/beier2008/readme-beier2008.txt 
#       Description: NOAA location of the template
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# Original_Source_URL:  
#       Description:
# 
# Description/Documentation lines begin with #
# Data lines have no #
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# Archive: Tree Ring
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# Dataset DOI: 
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# Parameter_Keywords: width
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# Contribution_Date
#	Date: 2017-11-08
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# File_Last_Modified_Date
#	Date: 2017-11-08
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# Title
#	Study_Name: Southeastern Alaska Yellow-Cedar Decline Data
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# Investigators
#	Investigators: Beier, C.; Sink, S.
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# Description_Notes_and_Keywords
#	Description: Tree-ring width data for 18 southeast Alaska yellow-cedar collections from the Beier et al. 2008 yellow-cedar decline study.  
#	Three of the collections are also included in the International Tree-Ring Data Bank, site codes AK156, AK157, AK158 (Cedar Lake/Juneau, 
#	Poison Cove Bog, Nemo).  18 decadal format tree ring width data files are available at: 
#	https://www1.ncdc.noaa.gov/pub/data/paleo/treering/beier2008/ 
#--------------------
# Publication 
#	Authors: Colin M. Beier, Scott E. Sink, Paul E. Hennon, David V. D'Amore, Glenn P. Juday
#	Published_Date_or_Year: 2008-06-01      
#	Published_Title: Twentieth-century warming and the dendroclimatology of declining yellow-cedar forests in southeastern Alaska
#	Journal_Name: Canadian Journal of Forest Research
#	Volume: 38
#	Edition: 
#	Issue: 6
#	Pages: 1319-1334
#	Report_Number: 
#	DOI: 10.1139/X07-240
#	Online_Resource: http://www.nrcresearchpress.com/doi/10.1139/X07-240
#	Full_Citation: 
#	Abstract: Decline of yellow-cedar (Chamaecyparis nootkatensis ((D. Don) Spach) has occurred on 200 000 ha of temperate rainforests across southeastern Alaska. Because declining forests appeared soon after the Little Ice Age and are limited mostly to low elevations (whereas higher elevation forests remain healthy), recent studies have hypothesized a climatic mechanism involving early dehardening, reduced snowpack, and freezing injury. This hypothesis assumes that a specific suite of microclimatic conditions occurs during late winter and declining cedar populations across the region have responded similarly to these conditions. Based on the first geographically extensive tree ring chronologies constructed for southeastern Alaska, we tested these assumptions by investigating regional climatic trends and the growth responses of declining cedar populations to this climatic variation. Warming winter trends were observed for southeastern Alaska, resulting in potentially injurious conditions for yellow-cedar due to reduced snowfall and frequent occurrence of severe thaw-freeze events. Declining cedar forests shared a common regional chronology for which late-winter weather was the best predictor of annual growth of surviving trees. Overall, our findings verify the influence of elevational gradients of temperature and snow cover on exposure to climatic stressors, support the climatic hypothesis across large spatial and temporal scales, and suggest cedar decline may expand with continued warming.
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# Funding_Agency 
#	Funding_Agency_Name: US Department of Agriculture 
#	Grant: New Crops
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# Funding_Agency 
#	Funding_Agency_Name: University of Alaska Fairbanks
#	Grant: Center for Global Change
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# Site_Information 
#	Site_Name: Southeast Alaska
#	Location: North America>United States Of America>Alaska
#	Country: United States Of America 
#	Northernmost_Latitude: 58.7
# 	Southernmost_Latitude: 56.2
# 	Easternmost_Longitude: -131.8
# 	Westernmost_Longitude: -135.6
# 	Elevation: 
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# Data_Collection   
#	Collection_Name: Beier2008decline
#	Earliest_Year: 1700
#	Most_Recent_Year: 2004
#	Time_Unit: AD
#	Core_Length: 
#	Notes: 
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# Species 
#	Species_Name: Chamaecyparis nootkatensis (D. Don) Spach
#	Common_Name: Alaska yellow-cedar
#	Tree_Species_Code: CHNO
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# Chronology_Information
#	Chronology: 
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# Variables 
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# Data variables follow are preceded by "##" in columns one and two.
# Data line variables format:  one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) 
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## age_AD	age, , , AD, , , , ,N,
## trw	width, , , .01 mm, ,tree ring,,,N, 
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# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Values:  
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age_AD	trw