# British Columbia 2,900 Year Bivalve Sclerochronology and Sea Surface Temperature Reconstruction
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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/33312 
#       Description: NOAA Landing Page
# Online_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/edge2021/tree-nob2021pith.txt 
#       Description: NOAA location of the template
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# Original_Source_URL:  
#       Description:
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# Description/Documentation lines begin with #
# Data lines have no #
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# Data Type: Paleoceanography
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# Dataset DOI: 
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# Parameter_Keywords: physical properties, reconstruction
#--------------------
# Contribution_Date
#	Date: 2021-07-19
#--------------------
# File_Last_Modified_Date
#	Date: 2021-07-19
#--------------------
# Title
#	Study_Name: British Columbia 2,900 Year Bivalve Sclerochronology and Sea Surface Temperature Reconstruction
#--------------------
# Investigators
#	Investigators: Edge, D.C.; Reynolds, D.J.; Wanamaker, A.D.; Griffin, D.; Bureau, D.; Outridge, C.; Stevick, B.C.; Weng, R.; Black, B.A. 
#--------------------
# Description_Notes_and_Keywords
#	Description: Growth increment widths from Pacific geoduck (Panopea generosa) shells collected at Tree Nob, British Columbia, for the past 2,900 years, 
#	plus growth rate master chronology, pith offset, and 1,250 year sea surface temperature reconstruction.
#--------------------
# Publication 
#	Authors: David C. Edge, David J. Reynolds, Alan D. Wanamaker, Daniel Griffin, Dominique Bureau, Christine Outridge, Bethany C. Stevick, Richard Weng, Bryan A. Black
#	Published_Date_or_Year: 2021-09-01     
#	Published_Title: A Multicentennial Proxy Record of Northeast Pacific Sea Surface Temperatures From the Annual Growth Increments of Panopea generosa
#	Journal_Name: Paleoceanography and Paleoclimatology
#	Volume: 36
#	Edition: e2021PA004291
#	Issue: 9
#	Pages:
#	Report_Number: 
#	DOI: 10.1029/2021PA004291
#	Online_Resource: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021PA004291
#	Full_Citation: 
#	Abstract: Growth-increment widths of Pacific geoduck (Panopea generosa), a long-lived bivalve, are used to develop the first marine-based, multicentennial, annually resolved, and exactly dated archive of Northeast Pacific sea surface temperatures (SST). The chronology is sampled from the Tree Nob Islands, British Columbia, Canada, continuously covers 1725-2008, and also contains nine older radiocarbon-dated segments, which together span 58% of the last 1,500 years. Age-related growth declines were removed by aligning all increments relative to age of increment formation and fitting with a single detrending curve to preserve low-frequency signals. The geoduck chronology was used to reconstruct local SST variability across the seasonal window of April through November. The chronology at both the concurrent (lag-0) and following (lag+1) year are both highly significant predictors of SST in a stepwise multiple linear regression, explaining 54% of the variance in the period of instrumental overlap (1940-2001), passing strict tests of calibration-verification. Reconstructed SSTs contained significant spectral power at periods from 3 to 64 years, suggesting that 20th century variability in these periodicities is not unusual in the longer-term context. The period of lowest growth coincided with the Dalton minimum, an episode of reduced solar irradiance from 1790-1830, as well as the 1809 Unknown eruption, suggesting that solar and volcanic signals are present in the SST history. The most conspicuous aspect of the reconstruction is the steady and unprecedented warming trend that began in the mid-1800s and continues through present. The post-1976 interval includes the two warmest decades of the reconstruction.
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# Funding_Agency 
#	Funding_Agency_Name: US National Science Foundation
#	Grant: 1855628
#------------------
# Site_Information 
#	Site_Name: Tree Nob 
#	Location: North America>Canada>British Columbia
#	Country: Canada
#	Northernmost_Latitude: 54.217369
# 	Southernmost_Latitude: 54.217369
# 	Easternmost_Longitude: -130.789331
# 	Westernmost_Longitude: -130.789331
# 	Elevation: -10
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# Data_Collection   
#	Collection_Name: TreeNob2021pith
#	Earliest_Year: -864
#	Most_Recent_Year: 2008
#	Time_Unit: Year CE 
#	Core_Length: 
#	Notes: 
#------------------
# Chronology_Information
#	Chronology: Chronology segments after 1724 are absolutely dated, prior to 1725 are radiocarbon dated
# 	
#----------------
# Variables 
#
# 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) 
#
## ID	sample identification, , , , , paleoceanography, , ,C, Series Identifier for Panopea generosa
## PO	pith offset, Panopea generosa, , year, ,paleoceanography,,,N, Ontogenetic years
#
#----------------
# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Values: NA
# 
ID	PO
TD118a	2
TD118b	2
TD067a	5
TD067b	5
TD122a	2
TD122b	2
TD134a	2
TD134b	2
TD135a	1
TD135b	1
TD110a	1
TD110b	1
TD125a	1
TD125b	1
TD161a	3
TD161b	3
TD160a	2
TD160b	2
TD168a	1
TD168b	4
TD100a	2
TD100b	2
TD058a	2
TD058b	2
TD230a	2
TD230b	2
TD092a	3
TD092b	3
TD155a	2
TD155b	2
TD158a	1
TD158b	1
TD109a	6
TD109b	4
TD036a	2
TD036b	2
TD069a	4
TD069b	4
TD237a	3
TD237b	3
TD077a	5
TD077b	5
TD045a	4
TD045b	4
TD057a	3
TD057b	3
TD238a	5
TD238b	5
TD176a	3
TD176b	3
TD172a	3
TD172b	3
TD166a	5
TD166b	5
TD088a	1
TD088b	1
TNR41a	3
TNR41b	3
TNR51a	15
TNR51b	15
TNR37a	2
TNR37b	2
TD035a	8
TD035b	6
TD053a	13
TD053b	13
TD070a	7
TD070b	7
TD81a	3
TD81b	3
TD039a	5
TD039b	5
TD028a	5
TD028b	5
TD048a	5
TD048b	5
TD049a	2
TD049b	2
TD052a	2
TD052b	2
TD054a	3
TD054b	3
TNR33a	14
TNR33b	14
TD012a	2
TD012b	2
TD066a	2
TD066b	2
TD034a	4
TD034b	4
TD056a	8
TD056b	8
TNR21a	4
TNR21b	4
TNR42a	9
TNR42b	9
TNR39a	3
TNR39b	3
TD047a	4
TD047b	4
TD079a	3
TD079b	3
TD144a	3
TD144b	3
TD031a	5
TD031b	5
TNR20a	2
TNR20b	2
TNR45a	3
TNR45b	3
TNR43a	9
TNR43b	9
TNR49a	7
TNR49b	7
TD030a	3
TD030b	3
TD029a	3
TD029b	3
TD023a	10
TD023b	10
TD167a	3
TD167b	3
TN001a	12
TN001b	12
TN002a	21
TN002b	21
TN003a	21
TN003b	19
TN004a	6
TN004b	7
TN005a	15
TN005b	15
TN006a	17
TN006b	15
TN007a	10
TN007b	13
TN008a	14
TN008b	14
TN009a	19
TN009b	15
TN011a	12
TN011b	12
TN012a	10
TN012b	15
TN013a	11
TN013b	11
TN014a	6
TN014b	11
TN015a	13
TN015b	13
TN016a	14
TN016b	11
TN017a	11
TN017b	10
TN018a	10
TN018b	10
TN019a	14
TN019b	12
TN020a	13
TN020b	10
TN021a	17
TN021b	7
TN022a	16
TN022b	16
TN023a	3
TN023b	3
TN024a	8
TN024b	7
TN025a	8
TN025b	7
TN026a	12
TN026b	11
TN027a	9
TN027b	8
TN028a	5
TN028b	5
TN029a	11
TN029b	11
TN030a	11
TN030b	10
TN031a	5
TN031b	6
TN032a	5
TN032b	6
TN033a	9
TN033b	9
TD185a	2
TD185b	2
TD177a	2
TD177b	2
TD179b	18
TD179c	9
TD180a	2
TD180b	2
TD175a	3
TD175b	3
TD064a	2
TD064b	2
TD146a	3
TD146b	1
TD117a	2
TD117b	2
TD150a	4
TD150b	4
TD147a	2
TD147b	2
TD095a	2
TD095b	2
TD090a	2
TD090b	2
TD091a	2
TD091b	2
TD013a	3
TD013b	3
TD037a	5
TD037b	5
TNR05a	4
TNR05b	4
TD061a	3
TD061b	3
TD107a	3
TD107b	3
TD105a	4
TD105b	4
TD131a	2
TD131b	2
TD136a	3
TD136b	3
TD123a	3
TD123b	3
TNR14a	10
TNR14b	10
TD163a	2
TD163b	2
TD075a	2
TD075b	2
TD076a	3
TD076b	3
TD040a	2
TD040b	2
TD063a	2
TD063b	2
TD085a	2
TD085b	2
TD051a	2
TD051b	2
TD078a	3
TD078b	3
TD043a	2
TD043b	2
TD042a	2
TD042b	2
TNR55a	2
TNR55b	2
TD074a	2
TD074b	2
TNR61b	2
TNR61d	2
TD149a	2
TD149b	2
TD165a	3
TD165b	3
TD087a	5
TD087b	5
TD060a	9
TD060b	9
TD062a	2
TD062b	2
TD044a	4
TD044b	4
TD041a	6
TD041b	6
TD082a	11
TD082b	11
TD083a	2
TD083b	2
TD171a	1
TD171b	44
TD169a	2
TD169b	2
TD103a	2
TD103b	2
TD189a	4
TD189b	4
TD201a	3
TD201b	3