# Deep Pacific 22,000 Year D14C Data and Projection Ventilation Ages 
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#                World Data Service for Paleoclimatology, Boulder 
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#                     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/25110 
#       Description: NOAA Landing Page
# Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-dd14c-err.txt
#       Description: NOAA location of the template
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# Original_Source_URL:  
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# Description/Documentation lines begin with #
# Data lines have no #
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# Archive: Paleoceanography
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# Dataset DOI: 
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# Parameter_Keywords: age control, carbon isotopes
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# Contribution_Date
#	Date: 2018-09-07
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# File_Last_Modified_Date
#	Date: 2018-09-07
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# Title
#	Study_Name: Deep Pacific 22,000 Year D14C Data and Projection Ventilation Ages 
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# Investigators
#	Investigators: Lund, D.C.
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# Description_Notes_and_Keywords
#	Description: Deep Pacific ventilation ages estimated from D14C using revised projection age and TTD-ETD methods on 4 Pacific Ocean sediment cores for the past 22,000 years.
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# Publication 
#	Authors: David C.Lund
#	Published_Date_or_Year: 2013-11-01      
#	Published_Title: Deep Pacific ventilation ages during the last deglaciation: Evaluating the influence of diffusive mixing and source region reservoir age 
#	Journal_Name: Earth and Planetary Science Letters
#	Volume: 381
#	Edition: 
#	Issue: 
#	Pages: 52-62
#	Report_Number: 
#	DOI: 10.1016/j.epsl.2013.08.032
#	Online_Resource: https://www.sciencedirect.com/science/article/pii/S0012821X1300469X
#	Full_Citation: 
#	Abstract: Enhanced ventilation of the deep ocean during the last deglaciation may have caused the rise in atmospheric carbon dioxide that drove Earth's climate from a glacial to interglacial state. Recent results based on the projection age method, however, suggest the ventilation rate of the deep Pacific slowed during the deglaciation, opposite the expected pattern (Lund et al., 2011). Because the projection age method does not account for tracer diffusion (Adkins and Boyle, 1997) it can yield spurious results and therefore requires validation with alternative techniques. Here ventilation ages are determined using the transit-time equilibration-time distribution (TTD-ETD) method which explicitly accounts for diffusive mixing in the ocean interior (DeVries and Primeau, 2010). The overall time history of deep Pacific TTD-ETD and projection ages is very similar; both show a 1000-yr increase in ventilation age during Heinrich Stadial 1 (HS1; 14.5-17.5 kyr BP) and a 500-yr increase during the Younger Dryas (YD). The similarity is due in part to the use of projection age error estimates that take into account uncertainty in both calendar age and benthic 14C age. Centennial-scale offsets between the TTD-ETD and projection ages are due primarily to the different approaches used to estimate surface ocean radiocarbon content. Both the TTD-ETD and projection age results imply that the ventilation rate of the deep Pacific decreased during the deglaciation, opposite the pattern expected if Southern Ocean upwelling and enhanced meridional overturning drove outgassing of CO2 from the abyss. Variations in surface water reservoir age could cause an apparent shift in deep Pacific ventilation age but existing proxy records from the Southern Ocean appear to be inconsistent with such a driver.
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# Funding_Agency 
#	Funding_Agency_Name: University of Michigan
#	Grant: 
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# Site_Information 
#	Site_Name: W8709A-13PC
#	Location: Ocean>Pacific Ocean>North Pacific Ocean
#	Country:  
#	Northernmost_Latitude: 42.1
# 	Southernmost_Latitude: 42.1
# 	Easternmost_Longitude: -125.8
# 	Westernmost_Longitude: -125.8
# 	Elevation: -2710 m
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# Data_Collection   
#	Collection_Name: Lund2013-13PC-DD14C-err
#	Earliest_Year: 24308
#	Most_Recent_Year: 1390
#	Time_Unit: Cal. Year BP
#	Core_Length: 
#	Notes: 
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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_calkaBP+	age, , , calendar Kyears before present, , , , ,N,
## DD14C+	Delta D14C upper, , , per mil, ,Paleoceanography,,,N,
## age_calkaBP-	age, , , calendar Kyears before present, , , , ,N,
## DD14C-	Delta D14C lower, , , per mil, ,Paleoceanography,,,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_calkaBP+	DD14C+	age_calkaBP-	DD14C-
1.390	11.374	1.410	0.739
9.476	46.802	9.904	0.640
9.971	51.467	10.535	-6.842
10.327	28.831	10.796	-18.036
10.889	38.272	11.430	-17.362
11.064	45.513	11.631	-7.678
11.545	72.519	12.060	36.673
11.494	122.931	12.314	48.170
12.545	111.754	13.228	17.496
12.396	125.656	13.076	35.326
13.014	91.208	13.748	-10.745
13.366	56.927	13.943	-23.108
13.007	112.466	13.704	17.096
13.948	40.578	14.315	0.684
14.295	87.081	14.713	65.817
14.758	128.832	15.164	85.765
14.961	136.271	15.513	81.560
15.203	178.746	15.979	102.001
15.366	128.473	16.031	98.604
16.490	116.061	17.489	-36.397
16.576	146.214	17.554	2.235
17.207	174.691	18.083	50.738
17.165	117.979	18.039	-1.934
17.174	167.879	18.050	15.887
18.005	83.431	18.452	24.095
18.143	116.817	18.594	44.040
18.285	159.211	18.806	57.027
18.762	111.738	19.312	12.405
19.005	77.317	19.831	-64.718
19.277	67.716	19.841	-40.823
20.299	94.366	20.743	11.742
20.310	130.794	21.194	20.590
21.526	74.527	22.287	-44.325
23.634	176.300	24.308	71.971