# Subantarctic Atlantic Ocean Foraminifera-bound d15N, Iron and Alkenone Flux Data for the last 160,000 years
#-----------------------------------------------------------------------
#              World Data Center for Paleoclimatology, Boulder 
#                                  and 
#                       NOAA Paleoclimatology Program 
#-----------------------------------------------------------------------
# NOTE: Please cite original publication, online resource and date accessed when using this data.
# If there is no publication information, please cite Investigator, title, online resource and date accessed.
#
#  Online_Resource: http://www.ncdc.noaa.gov/paleo/study/18318
#  Online_Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/martinez-garcia2014/martinez-garcia2014-alk.txt
#
# Archive: Paleoceanography
#
#--------------------------------
# Contribution_Date
# Date: 2014
#--------------------------------
# Title:     Subantarctic Atlantic Ocean Foraminifera-bound d15N, Iron and Alkenone Flux Data for the last 160,000 years
#--------------------------------
# Investigators: Martínez-García, Alfredo; Sigman, D.M.; Ren, H.; Anderson, R.F.; Straub, M.; Hodell, D.A.; Jaccard, S.L.; Eglinton, T.I.; Haug, G.H.
#--------------------
# Description and Notes: 
#    Description: Foraminifera-bound d15N, iron and alkenone fluxes measured in ODP Site 1090 over the past glacial cycle.
#
#    Provided Keywords: Iron Fertilization, Carbon Dioxide, Southern Ocean, Nitrogen Isotopes, Alkenones
#--------------------
# Publication 
#   Authors: Martínez-García, A., Sigman, D.M., Ren, H., Anderson, R.F., Straub, M., Hodell, D.A., Jaccard, S.L., Eglinton, T.I. and Haug, G.H.
#   Journal_Name: Science
#   Published_Title: Iron Fertilization of the Subantarctic Ocean During the Last Ice Age
#   Published_Date_or_Year: 2014
#   Volume: 343
#   Pages: 1347-1350
#   DOI: 10.1126/science.1246848 
# Abstract: John H. Martin, who discovered widespread iron limitation of ocean productivity, proposed that dust-borne iron fertilization of Southern Ocean phytoplankton caused the ice age reduction in atmospheric carbon dioxide (CO2). In a sediment core from the Subantarctic Atlantic, we measured foraminifera-bound nitrogen isotopes to reconstruct ice age nitrate consumption, burial fluxes of iron, and proxies for productivity. Peak glacial times and millennial cold events are characterized by increases in dust flux, productivity, and the degree of nitrate consumption; this combination is uniquely consistent with Subantarctic iron fertilization. The associated strengthening of the Southern Ocean’s biological pump can explain the lowering of CO2 at the transition from mid-climate states to full ice age conditions as well as the millennial-scale CO2 oscillations.
#--------------------------------
# Funding_Agency: 
#    Funding_Agency_Name:
#    Grant:
#--------------------------------
# Site Information: 
# Site_Name: ODP1090
# Location: Atlantic Ocean
#	Northernmost_Latitude:  -42.92
# 	Southernmost_Latitude:  -42.92
# 	Easternmost_Longitude: 8.9
# 	Westernmost_Longitude: 8.9
# 	Elevation: 3702
#--------------------------------
# Data Collection 
# Collection_Name: ODP1090 alkenone flux M-G14
# Oldest_Year: 155280
# Most_Recent_Year: 1590
# Time_Unit: cal yrBP (1950 AD)
# Core_Length: 
# Notes: 
#--------------------------------
# Chronology    
#--------------------------------
# Variables    
# 
# Data variables follow (have double marker- "##")
# Data line variables format:  Variables list, one per line, shortname-tab-nine components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) 
## age_calkaBP  age,,,calendar kiloyears before 1950,,,,,N
## alk-flux	Alkenone flux,,,ng cm-2 ky-1 ,,paleoceanography,,,N
#-----------------------------------
# Data:
# Missing Value: -999
age_calkaBP	alk-flux
1.59	61.73
2.06	35.96
2.52	27.15
2.99	21.76
3.46	23.27
3.86	16.68
4.55	12.13
4.91	15.58
5.17	13.94
5.57	23.10
5.70	24.78
6.00	13.66
6.16	22.22
6.32	15.59
6.64	16.45
7.43	17.50
7.82	23.86
8.60	19.05
9.79	26.13
11.01	19.51
12.23	26.12
13.51	23.59
14.51	25.37
15.19	17.98
16.30	18.92
16.90	22.08
18.09	63.32
18.26	30.58
18.57	32.89
18.88	85.31
19.19	156.26
19.49	225.71
19.94	440.04
20.56	596.35
20.87	700.80
21.16	680.02
21.38	574.98
21.59	626.18
21.81	500.06
22.02	502.27
22.23	555.32
22.49	496.51
22.97	543.21
23.76	491.16
24.84	509.24
25.75	518.79
26.23	466.53
26.38	524.46
26.72	492.82
27.13	512.71
27.53	416.20
27.74	398.66
28.56	373.56
29.11	343.10
29.67	431.17
30.23	474.77
30.78	485.54
31.25	400.11
31.92	382.43
32.86	337.40
33.70	347.46
34.29	434.87
34.78	366.51
35.47	499.85
35.90	479.95
36.31	350.17
36.73	335.89
37.14	296.76
37.56	286.58
39.39	384.29
39.59	511.50
40.55	566.16
41.76	590.20
42.50	625.39
42.98	697.60
43.28	707.25
43.41	757.81
43.60	817.53
43.80	588.79
44.22	695.18
44.77	468.61
44.78	322.09
44.80	321.01
45.06	397.57
45.92	328.15
46.78	354.92
47.48	512.14
47.95	575.50
48.42	905.28
48.88	648.46
49.58	558.33
49.81	516.15
50.28	474.32
50.62	494.03
50.96	449.81
51.64	248.76
52.57	181.23
53.50	185.93
54.24	160.29
54.86	248.08
55.47	225.83
55.85	234.93
56.63	214.28
57.54	256.04
58.86	206.03
60.90	189.46
61.36	188.79
62.01	253.04
62.49	240.28
62.96	264.68
63.41	292.87
63.52	320.55
63.82	318.12
64.24	351.25
64.66	391.87
65.07	372.15
65.49	414.42
65.91	461.86
66.24	615.71
66.51	512.99
66.91	559.09
67.15	585.29
67.76	686.25
68.36	737.14
68.88	727.79
69.09	506.28
69.47	563.95
69.70	629.49
69.93	492.46
70.15	270.41
70.66	274.48
70.79	289.87
71.03	200.64
71.28	128.60
71.53	226.29
71.69	224.56
71.80	254.00
71.95	224.51
72.36	117.14
72.77	117.84
73.45	121.58
74.12	104.58
75.47	135.47
76.04	141.96
76.31	94.64
76.87	100.62
77.39	108.21
78.33	99.28
79.10	76.02
79.87	63.96
80.64	65.51
81.42	120.22
82.19	60.87
82.96	82.18
83.59	70.71
84.51	76.50
84.88	71.22
85.62	123.42
86.35	79.88
87.09	107.41
88.09	104.41
88.38	95.13
88.96	113.42
89.54	95.85
90.13	79.03
91.03	94.57
91.33	87.22
91.93	91.21
92.53	92.34
93.13	106.84
95.34	101.09
96.72	148.25
98.39	101.15
100.12	64.74
101.83	67.83
103.25	87.27
104.61	68.50
105.98	69.33
107.35	92.35
108.72	76.15
110.08	69.04
113.29	61.66
120.39	47.44
123.94	57.02
127.47	34.39
130.51	42.03
132.23	33.84
132.51	41.52
132.74	37.10
132.95	27.96
133.10	41.87
133.30	74.50
133.56	55.28
134.25	97.11
134.73	116.93
135.67	116.90
137.01	117.84
137.96	149.44
138.25	264.03
140.71	736.78
143.37	1031.25
145.77	931.01
147.12	797.19
148.09	642.31
149.69	603.99
152.49	717.64
155.28	876.07