# 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-d14c-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-D14C-err
#	Earliest_Year: 22969
#	Most_Recent_Year: 40
#	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,
## D14C-	Delta 14C lower, , , per mil, ,Paleoceanography,,,N,
## age_calkaBP+	age, , , calendar Kyears before present, , , , ,N,
## D14C+	Delta 14C upper, , , 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-	D14C-	age_calkaBP+	D14C+
0.040	-247.038	0.060	-238.404
8.107	-191.275	8.572	-143.626
8.636	-179.393	9.183	-122.184
8.982	-156.342	9.454	-105.715
9.562	-144.345	10.088	-87.247
9.707	-150.275	10.262	-90.689
10.194	-156.396	10.710	-101.049
10.164	-193.354	10.938	-107.683
11.207	-149.786	11.860	-78.500
11.062	-161.184	11.759	-87.040
11.642	-140.032	12.404	-56.329
12.012	-113.436	12.570	-49.485
11.640	-157.229	12.363	-79.865
12.593	-104.045	12.975	-61.148
12.936	-131.679	13.367	-83.633
13.410	-127.201	13.808	-82.546
13.597	-131.168	14.165	-65.627
13.831	-153.061	14.642	-50.444
14.024	-108.034	14.679	-33.570
15.170	-15.354	16.140	108.957
15.194	-47.597	16.182	74.160
15.855	-70.242	16.771	49.008
15.859	-18.738	16.711	90.951
15.840	-58.869	16.724	71.283
16.655	19.282	17.082	75.434
16.798	2.776	17.234	58.574
16.951	-27.513	17.460	35.142
17.398	-14.159	17.944	61.342
17.651	14.273	18.471	125.934
17.912	21.014	18.495	105.403
18.934	-8.037	19.393	73.581
18.990	-25.649	19.832	88.979
20.178	52.944	20.946	162.024
22.243	4.900	22.969	107.506