# South Pole Ice Core (SPICEcore) SP19 Age Model
#----------------------------------------------------------------------- 
#                World Data Service for Paleoclimatology, Boulder 
#                                  and 
#                     NOAA Paleoclimatology Program 
#             National Centers for Environmental Information (NCEI)
#----------------------------------------------------------------------- 
# 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. 
#
# Online_Resource: https://www.ncdc.noaa.gov/paleo/study/27690
#       Description: NOAA Landing Page
# Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/sp19d15n.txt 
#       Description: NOAA location of the template
#
# Original_Source_URL:  
#       Description:
# 
# Description/Documentation lines begin with #
# Data lines have no #
#
# Archive: Ice Core
#
# Dataset DOI: 
#
# Parameter_Keywords: age control, chemistry, accumulation, nitrogen isotopes
#--------------------
# Contribution_Date
#	Date: 2019-09-19
#--------------------
# File_Last_Modified_Date
#	Date: 2019-09-19
#--------------------
# Title
#	Study_Name: South Pole Ice Core (SPICEcore) SP19 Age Model
#--------------------
# Investigators
#	Investigators: Winski, D.A.; Fudge, T.J.; Ferris, D.G.; Osterberg, E.C.; Fegyveresi, J.M.; Cole-Dai, J.; Thundercloud, Z.; Cox, T.S.; Kreutz, K.J.; Ortman, N.; Buizert, C.; Epifanio, J.; Brook, E.J.; Beaudette, R.; Severinghaus, J.; Sowers, T.; Steig, E.J.; Kahle, E.C.; Jones, T.R.; Morris, V.; Aydin, M.; Nicewonger, M.R.; Casey, K.A.; Alley, R.B.; Waddington, E.D.; Iverson, N.A.; Dunbar, N.W.; Bay, R.C.; Souney, J.M.; Sigl, M.; McConnell, J.R.
#--------------------
# Description_Notes_and_Keywords
#	Description: The SP19 timescale: depth-age relationship and associated uncertainties for the South Pole Ice Core (SPICEcore), with supporting data. 
#--------------------
# Publication 
#	Authors: Dominic A. Winski, Tyler J. Fudge, David G. Ferris, Erich C. Osterberg, John M. Fegyveresi, Jihong Cole-Dai, Zayta Thundercloud, Thomas S. Cox, Karl J. Kreutz, Nikolas Ortman, Christo Buizert, Jenna Epifanio, Edward J. Brook, Ross Beaudette, Jeffrey Severinghaus, Todd Sowers, Eric J. Steig, Emma C. Kahle, Tyler R. Jones, Valerie Morris, Murat Aydin, Melinda R. Nicewonger, Kimberly A. Casey, Richard B. Alley, Edwin D. Waddington, Nels A. Iverson, Nelia W. Dunbar, Ryan C. Bay, Joseph M. Souney, Michael Sigl, and Joseph R. McConnell
#	Published_Date_or_Year: 2019-10-08     
#	Published_Title: The SP19 Chronology for the South Pole Ice Core - Part 1: volcanic matching and annual layer counting
#	Journal_Name: Climate of the Past 
#	Volume: 15
#	Edition: 
#	Issue: 5
#	Pages:
#	Report_Number: 
#	DOI: 10.5194/cp-15-1793-2019
#	Online_Resource: https://www.clim-past.net/15/1793/2019/
#	Full_Citation: 
#	Abstract: The South Pole Ice Core (SPICEcore) was drilled in 2014-2016 to provide a detailed multi-proxy archive of paleoclimate conditions in East Antarctica during the Holocene and late Pleistocene. Interpretation of these records requires an accurate depth-age relationship. Here, we present the SPICEcore (SP19) timescale for the age of the ice of SPICEcore. SP19 is synchronized to the WD2014 chronology from the West Antarctic Ice Sheet Divide (WAIS Divide) ice core using stratigraphic matching of 251 volcanic events. These events indicate an age of 54302±519BP (years before 1950) at the bottom of SPICEcore. Annual layers identified in sodium and magnesium ions to 11341BP were used to interpolate between stratigraphic volcanic tie points, yielding an annually resolved chronology through the Holocene. Estimated timescale uncertainty during the Holocene is less than 18 years relative to WD2014, with the exception of the interval between 1800 to 3100 BP when uncertainty estimates reach ±25 years due to widely spaced volcanic tie points. Prior to the Holocene, uncertainties remain within 124 years relative to WD2014. Results show an average Holocene accumulation rate of 7.4cm yr-1 (water equivalent). The time variability of accumulation rate is consistent with expectations for steady-state ice flow through the modern spatial pattern of accumulation rate. Time variations in nitrate concentration, nitrate seasonal amplitude and d15N of N2 in turn are as expected for the accumulation rate variations. The highly variable yet well-constrained Holocene accumulation history at the site can help improve scientific understanding of deposition-sensitive climate proxies such as d15N of N2 and photolyzed chemical compounds.
#------------------
# Funding_Agency 
#	Funding_Agency_Name: US National Science Foundation
#	Grant: 1443105, 1141839 (Steig), 1443336 (Osterberg), 1443397 (Kreutz), 1443663 (Cole-Dai), 1443232 (Waddington, Fudge), 1142517, 1443470 (Aydin), 1443464 (Sowers), 1443710 (Severinghaus), 1542778 (Alley, Fegyveresi), 1443472, 1643722 (Brook), 1543454 (Dunbar)
#------------------
# Site_Information 
#	Site_Name: South Pole Ice Core (SPICEcore)
#	Location: Antarctica
#	Country:  
#	Northernmost_Latitude: -89.99
# 	Southernmost_Latitude: -89.99 
# 	Easternmost_Longitude: -99.16
# 	Westernmost_Longitude: -99.16
# 	Elevation: 2835 m 
#------------------
# Data_Collection   
#	Collection_Name: SP19d15N2
#	Earliest_Year: 52516
#	Most_Recent_Year: 68
#	Time_Unit: Cal. years BP
#	Core_Length: 1751 
#	Notes: SPICE d15N of N2 data from Scripps Institution of Oceanography (Severinghaus, Beaudette)
#------------------
# Chronology_Information
#	Chronology: Chronology is constrained by volcanic events linked with the WAIS-Divie ice core and annual layer counting of sodium and magnesium.  
# 	
#----------------	
# 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) 
#
## depth_m	depth, , , meter, , , , ,N,
## age_calBP	age, ice, , calendar year before present, , ice core, , ,N, Years Before 1950 CE
## d15N-N2	delta 15N, ice, , per mil, , ice core, , ,N, delta 15N of N2
#
#----------------
# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Values:  
#
depth_m	age_calBP	d15N-N2
125.3	68.7	0.579
130.56	131.1	0.579
135.52	192.2	0.567
140.3	251.2	0.554
165.52	575.5	0.561
175.3	700.6	0.58
195.49	968.7	0.572
230.38	1423.1	0.564
245.29	1620.7	0.56
255.5	1759.2	0.582
275.03	2042	0.579
285.55	2198.4	0.554
295.31	2350.5	0.532
305.3	2497.9	0.554
315.27	2646.3	0.57
326.04	2810.3	0.582
335.04	2943	0.591
346.14	3103.2	0.581
355.32	3234.9	0.59
370.14	3448.5	0.59
395.04	3811.7	0.593
405.26	3963.2	0.595
415.3	4111.9	0.595
426.27	4273.9	0.575
435.26	4404.9	0.585
465.6	4838.5	0.594
475.3	4978.4	0.608
480.75	5055.9	0.594
485.43	5121.8	0.588
490.89	5200.2	0.598
495.74	5269.8	0.601
500.74	5342.9	0.593
505.04	5404.2	0.587
511.18	5487.8	0.593
515.26	5545.9	0.594
522	5643.5	0.599
525.26	5686.6	0.603
551.03	6043.8	0.6
557.7	6136.6	0.598
561.04	6187.3	0.608
565.26	6251.1	0.6
569.3	6310.9	0.6
577.52	6436.2	0.602
581.04	6493.1	0.592
585.3	6559.9	0.605
597.24	6745.3	0.575
601.28	6807.7	0.571
605.3	6880	0.573
609.75	6957.1	0.575
613.04	7018	0.578
617.04	7086.1	0.569
621.19	7159.8	0.565
625.28	7230.9	0.576
629.04	7294.3	0.57
633.31	7370.7	0.574
637.54	7441.2	0.571
645.74	7586	0.578
649.26	7645.6	0.58
653.16	7712.5	0.583
657.24	7781.4	0.574
661.41	7849.4	0.577
669.2	7977.1	0.591
673.51	8049.1	0.588
677.22	8107.2	0.599
685.26	8233.8	0.593
694.04	8371.1	0.601
697.27	8420.4	0.605
705.1	8537	0.6
713.24	8669.3	0.603
721.29	8802.6	0.604
730.04	8950	0.597
735.07	9043.4	0.6
740.15	9140.1	0.584
745.12	9231.4	0.595
751	9346.5	0.592
755.15	9430.3	0.604
760.07	9530	0.598
765.09	9626.8	0.594
770.16	9725.9	0.595
775.04	9826.8	0.587
776.98	9865	0.594
779.97	9925.6	0.602
785.32	10032.1	0.604
791.09	10145.1	0.595
795.13	10225.5	0.609
800.08	10320.5	0.612
805.15	10420	0.609
810.14	10518.5	0.627
815.18	10621.9	0.627
820.15	10717.9	0.62
825.14	10813.9	0.628
830.16	10907.9	0.626
835.14	10996.6	0.614
840.17	11085.2	0.62
845.16	11168.4	0.616
850.86	11262.1	0.621
855.14	11333.7	0.62
860.15	11419.9	0.617
865.21	11506.9	0.618
871.09	11607.5	0.622
875.17	11680	0.625
880.25	11767.8	0.616
885.15	11853.3	0.616
890.17	11945.9	0.602
895.82	12059.9	0.611
900.24	12158.1	0.611
905.22	12276.7	0.601
910.18	12402.1	0.595
915.21	12533.4	0.59
920.24	12673.4	0.575
926.07	12844.6	0.584
930.27	12972.3	0.591
935.23	13127.4	0.575
940.25	13276.4	0.572
946.01	13449.7	0.569
950.34	13579.4	0.569
955.22	13730.2	0.576
960.29	13890.1	0.57
966.01	14065.2	0.566
970.28	14186.4	0.579
975.29	14313.7	0.583
980.17	14439.9	0.592
985.24	14581.2	0.592
990.23	14721.2	0.578
995.3	14869.1	0.581
1000.17	15012.4	0.571
1005.15	15160.8	0.578
1010.15	15306.3	0.578
1015.22	15453.2	0.559
1020.27	15599.6	0.573
1025.21	15734.3	0.583
1030.25	15870.9	0.572
1035.17	15996.3	0.576
1040.2	16132.8	0.572
1045.2	16278.7	0.565
1050.6	16436.5	0.565
1055.22	16570.7	0.564
1060.21	16725.6	0.551
1065.21	16893.2	0.526
1070.29	17078.1	0.527
1076.22	17318.9	0.521
1078.07	17403.4	0.518
1080.008	17492.7	0.52
1082.09	17586.9	0.525
1086.07	17765.9	0.521
1090.09	17952.8	0.517
1092.09	18037.3	0.518
1094.11	18128.8	0.518
1096.05	18220	0.532
1098.08	18313.6	0.53
1101.08	18449.9	0.528
1102.14	18494.3	0.524
1103.08	18532.6	0.532
1104.07	18572.2	0.532
1105.08	18613.9	0.541
1106.1	18658.9	0.546
1107.1	18703.7	0.546
1108.14	18745.4	0.542
1109.11	18786.3	0.538
1111.11	18875.3	0.543
1112.13	18921.1	0.546
1113.11	18961.6	0.548
1114.08	18999.2	0.541
1115.08	19039	0.546
1117.08	19132.2	0.547
1118.07	19178.8	0.543
1119.08	19223.7	0.552
1120.13	19272.5	0.56
1121.11	19319.9	0.538
1122.1	19367.3	0.548
1124.06	19460.1	0.552
1125.07	19507	0.554
1126.09	19551.5	0.547
1128.07	19638.5	0.541
1129.05	19681.6	0.545
1130.08	19723.7	0.544
1131.08	19763.9	0.545
1132.08	19809.7	0.54
1134.08	19900.3	0.554
1136.08	19986.5	0.556
1138.08	20068	0.546
1139.18	20115.9	0.551
1143.11	20278.1	0.534
1144.1	20316.3	0.551
1145.09	20358.5	0.558
1146.08	20400.3	0.552
1147.07	20441.2	0.565
1148.08	20479.7	0.56
1150.07	20556.5	0.553
1151.16	20604.4	0.538
1152.05	20643.1	0.542
1154.03	20727.1	0.542
1157.07	20871.3	0.544
1158.08	20919.1	0.532
1159.08	20965.9	0.533
1161.11	21074.7	0.525
1162.09	21127.2	0.505
1163.08	21179	0.528
1164.08	21233.5	0.532
1165.06	21289.3	0.525
1166.08	21349.5	0.515
1167.09	21411.6	0.519
1168.09	21472.5	0.51
1169.11	21530.1	0.514
1170.11	21585	0.504
1171.1	21637.2	0.506
1172.12	21693.5	0.506
1173.15	21754	0.509
1174.11	21814.8	0.506
1175.1	21877.7	0.504
1176.09	21941.9	0.498
1177.13	22012.3	0.504
1178.08	22074.2	0.498
1179.09	22145.8	0.505
1180.1	22216.6	0.502
1181.09	22280.1	0.493
1182.08	22344.6	0.493
1183.08	22411.5	0.498
1184.08	22479.7	0.491
1185.08	22545.5	0.5
1186.09	22613.6	0.503
1187.08	22676.9	0.495
1188.07	22740.1	0.499
1189.08	22809.7	0.496
1190.1	22876	0.496
1191.08	22936.4	0.495
1192.11	23004.3	0.501
1193.08	23069.7	0.501
1194.07	23138.6	0.495
1195.08	23204.7	0.492
1196.08	23262.6	0.493
1197.08	23317.6	0.495
1198.08	23375.2	0.496
1199.08	23431.1	0.504
1200.11	23486.1	0.513
1201.08	23539.1	0.51
1202.03	23594	0.504
1203.05	23656.1	0.509
1204.07	23718.5	0.502
1205.08	23778	0.505
1206.08	23832.5	0.514
1207.09	23888.2	0.516
1208.09	23940.4	0.52
1209.11	23996.2	0.513
1210.49	24076.3	0.514
1211.13	24111.5	0.511
1212.16	24169.6	0.512
1213.16	24222.4	0.519
1214.18	24275.1	0.504
1215.18	24332.8	0.518
1216.14	24387.5	0.518
1217.14	24439.9	0.511
1218.17	24495.2	0.526
1219.13	24547.5	0.523
1220.18	24606.1	0.52
1221.18	24664.4	0.522
1222.18	24719.3	0.523
1223.16	24771.1	0.528
1224.15	24824.8	0.521
1225.13	24878.6	0.524
1226.14	24938	0.529
1227.11	25000.2	0.53
1228.11	25067.3	0.529
1229.09	25132.8	0.538
1230.09	25198.7	0.543
1231.07	25266.9	0.538
1231.96	25327.8	0.53
1232.96	25395.9	0.537
1233.96	25469.8	0.542
1234.98	25540.5	0.545
1236.01	25613.8	0.545
1237.04	25689	0.551
1238.32	25778.9	0.541
1239.08	25831.5	0.544
1240.14	25901.4	0.539
1241.08	25958.3	0.535
1242.05	26012	0.535
1243.05	26064.9	0.54
1244.03	26115.7	0.526
1245.07	26171.3	0.539
1246.09	26228.1	0.544
1247.08	26283.7	0.542
1248.05	26343.1	0.539
1249	26400.5	0.543
1249.96	26453.5	0.536
1250.98	26510.4	0.536
1253.03	26629.5	0.539
1254.05	26688.5	0.532
1255.05	26745.1	0.544
1256.07	26800.8	0.534
1257.08	26856.8	0.547
1258.12	26915.2	0.541
1260.07	27024.8	0.55
1261.06	27080.1	0.548
1262.06	27134.8	0.54
1263.06	27191.9	0.543
1264.1	27255.5	0.538
1267.08	27436.2	0.536
1268.11	27500.2	0.541
1269.1	27565.3	0.553
1270.12	27633.4	0.544
1271.08	27699.8	0.545
1272.05	27767.4	0.549
1273.05	27838	0.544
1274.06	27908.2	0.543
1275.09	27981	0.534
1276.13	28054.1	0.538
1277.08	28118.3	0.514
1278.08	28185	0.53
1279.08	28253.4	0.526
1280.11	28326.6	0.538
1281.08	28391.6	0.525
1282.1	28463.6	0.539
1283.07	28532.6	0.523
1284.09	28603.4	0.54
1285.05	28668.6	0.534
1286.05	28732	0.535
1287.04	28791.6	0.541
1288.05	28852.1	0.549
1289.08	28907.9	0.544
1290.12	28958.2	0.548
1290.97	28999.4	0.542
1291.87	29045.3	0.55
1292.89	29094.6	0.556
1293.93	29147.7	0.546
1294.95	29200.8	0.551
1295.98	29255.8	0.554
1297	29308.1	0.544
1298.03	29357.8	0.547
1299.06	29408.3	0.551
1300.09	29457.6	0.548
1301.1	29506.5	0.545
1302.16	29555.3	0.549
1303.12	29598.9	0.549
1304.09	29642.9	0.557
1305.09	29688.8	0.553
1306.1	29736.6	0.55
1307.12	29785	0.553
1308.16	29835.7	0.56
1309.12	29884	0.559
1310.09	29934.2	0.56
1311.08	29987.8	0.565
1312.1	30043.6	0.563
1313.21	30105.6	0.559
1314.09	30158.2	0.567
1315.06	30215.3	0.56
1316.11	30276.9	0.543
1317.01	30328.7	0.543
1318.12	30391.9	0.551
1319.1	30446.8	0.548
1320.11	30502.6	0.547
1321.1	30559	0.543
1322.11	30617	0.545
1323.09	30671.8	0.54
1324.11	30731.3	0.544
1325.1	30789.3	0.54
1326.11	30844.6	0.545
1327.08	30894.8	0.534
1329.18	31006	0.535
1330.19	31062.1	0.544
1331.06	31112.1	0.537
1332.06	31171.9	0.542
1333.06	31232.7	0.547
1334.07	31297.6	0.542
1335.08	31363	0.551
1336.12	31431.2	0.547
1337.08	31497.3	0.549
1338.08	31565.2	0.554
1339.11	31635.8	0.552
1340.25	31714	0.552
1341.12	31776.9	0.541
1341.12	31776.9	0.541
1342.1	31847.4	0.546
1343.1	31917.9	0.538
1344.12	31985.9	0.54
1345.1	32055.2	0.541
1346.09	32124.1	0.541
1347.04	32187.5	0.546
1348.01	32253.3	0.537
1349.18	32332.9	0.549
1349.97	32384.3	0.54
1351	32444.2	0.552
1352.05	32500.2	0.552
1353.05	32554.8	0.545
1354.06	32609.2	0.552
1355	32657.3	0.553
1356.09	32712.3	0.553
1357.11	32760.7	0.554
1358.14	32806.8	0.543
1359.14	32851.4	0.548
1360.15	32896.9	0.546
1361.15	32941.5	0.553
1362.17	32986.3	0.545
1363.11	33027.4	0.553
1364.06	33068.2	0.539
1365.05	33110.9	0.553
1366.04	33154.6	0.558
1367.08	33202.1	0.545
1368.11	33248.3	0.556
1368.11	33248.3	0.556
1369.08	33290.6	0.546
1370.1	33336.5	0.547
1371.06	33380.2	0.552
1372.07	33426	0.551
1373.08	33472	0.549
1374.11	33520.5	0.559
1375.08	33564	0.554
1376.06	33605.7	0.569
1377.08	33648	0.565
1378.16	33693.8	0.565
1379.1	33734.7	0.57
1380.11	33778.9	0.572
1381.08	33819.9	0.568
1382.1	33863.9	0.551
1383.08	33905.1	0.567
1384.11	33946.9	0.561
1385.03	33983.1	0.561
1386.15	34026.4	0.56
1387.08	34064.2	0.561
1388.05	34105.2	0.565
1389.04	34147.9	0.562
1390.04	34190.5	0.566
1391.09	34234.4	0.566
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