# Greenland Ice Cores 500 Year Methanesulfonic Acid Data
#----------------------------------------------------------------------- 
#                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/26691 
#       Description: NOAA Landing Page
# Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/osman2019/osman2019ngt-b21msa.txt
#       Description: NOAA location of the template
#
# Original_Source_URL:  
#       Description:
# 
# Description/Documentation lines begin with #
# Data lines have no #
#
# Archive: Ice Cores
#
# Dataset DOI: 
#
# Parameter_Keywords: chemistry
#---------------------------------------
# Contribution_Date
#    Date: 2019-05-06
#---------------------------------------
# File_Last_Modified_Date
#    Date: 2019-05-06
#---------------------------------------
# Title
#    Study_Name: Greenland Ice Cores 500 Year Methanesulfonic Acid Data
#---------------------------------------
# Investigators
#      Investigators: Osman, M.B.; Das, S.B.; Trusel, L.D.; Evans, M.J.; Fischer, H.; Grieman, M.M.; Kipfstuhl, S.; McConnell, J.R.; Saltzman, E.S.
#---------------------------------------
# Description_Notes_and_Keywords
#        Description: Previously-unpublished raw (i.e., unsmoothed, unaveraged) methanesulfonic acid ice core measurements for 6/12 ice core records described in Osman et al. 2019.  
#	 Information on the source and accessibility of the remaining (previously published) ice core records are provided in the "Data Availaibility" of Osman et al. 2019.
#        Provided Keywords: Atlantic marine productivity, Industrial-era
#---------------------------------------
# Publication
# 	Authors: Matthew B. Osman, Sarah B. Das, Luke D. Trusel, Matthew J. Evans, Hubertus Fischer, Mackenzie M. Grieman, Sepp Kipfstuhl, Joseph R. McConnell, Eric S. Saltzman 
# 	Published_Date_or_Year: 2019-05-06
# 	Published_Title: Industrial-era decline of subarctic Atlantic productivity
# 	Journal_Name: Nature
# 	Volume: 569
# 	Edition: 
#	Issue: 7757
# 	Pages: 551-555
# 	Report Number: 
# 	DOI: 10.1038/s41586-019-1181-8
# 	Online_Resource: https://www.nature.com/articles/s41586-019-1181-8
# 	Full_Citation: 
# 	Abstract: MMarine phytoplankton have a crucial role in the modulation of marine-based food webs, fishery yields and the global drawdown of atmospheric carbon dioxide. However, owing to sparse measurements before satellite monitoring in the twenty-first century, the long-term response of planktonic stocks to climate forcing is unknown. Here, using a continuous, multi-century record of subarctic Atlantic marine productivity, we show that a marked 10 +/- 7% decline in net primary productivity has occurred across this highly productive ocean basin over the past two centuries. We support this conclusion by the application of a marine-productivity proxy, established using the signal of the planktonic-derived aerosol methanesulfonic acid, which is commonly identified across an array of Greenlandic ice cores. Using contemporaneous satellite-era observations, we demonstrate the use of this signal as a robust and high-resolution proxy for past variations in spatially integrated marine productivity. We show that the initiation of declining subarctic Atlantic productivity broadly coincides with the onset of Arctic surface warming, and that productivity strongly covaries with regional sea-surface temperatures and basin-wide gyre circulation strength over recent decades. Taken together, our results suggest that the decline in industrial-era productivity may be evidence of the predicted collapse of northern Atlantic planktonic stocks in response to a weakened Atlantic Meridional Overturning Circulation. Continued weakening of this Atlantic Meridional Overturning Circulation, as projected for the twenty-first century, may therefore result in further productivity declines across this globally relevant region. 
#---------------------------------------
# Publication 
#	Authors: Joseph R. McConnell, Ross Edwards, Gregory L. Kok, Mark G. Flanner, Charles S. Zender, Eric S. Saltzman, J. Ryan Banta, Daniel R. Pasteris, Megan M. Carter, Jonathan D. W. Kahl
#	Published_Date_or_Year: 2007-09-07   
#	Published_Title: 20th-Century Industrial Black Carbon Emissions Altered Arctic Climate Forcing
#	Journal_Name: Science
#	Volume: 317
#	Edition: 
#	Issue: 5843
#	Pages: 1381-1384
#	Report_Number: 
#	DOI: 10.1126/science.1144856 
#	Online_Resource: https://science.sciencemag.org/content/317/5843/1381
#	Full_Citation: 
#	Abstract: Black carbon (BC) from biomass and fossil fuel combustion alters chemical and physical properties of the atmosphere and snow albedo, yet little is known about its emission or deposition histories. Measurements of BC, vanillic acid, and non–sea-salt sulfur in ice cores indicate that sources and concentrations of BC in Greenland precipitation varied greatly since 1788 as a result of boreal forest fires and industrial activities. Beginning about 1850, industrial emissions resulted in a sevenfold increase in ice-core BC concentrations, with most change occurring in winter. BC concentrations after about 1951 were lower but increasing. At its maximum from 1906 to 1910, estimated surface climate forcing in early summer from BC in Arctic snow was about 3 watts per square meter, which is eight times the typical preindustrial forcing value.
#---------------------------------------
# Funding_Agency
#    Funding_Agency_Name: National Science Foundation
#    Grant: OPP-1205196
#---------------------------------------
# Funding_Agency
#    Funding_Agency_Name: Deutsche Forschungsgemeinschaft (DFG) 
#    Grant: Wa 709/2
#---------------------------------------
# Site Information
# Site_Name: NGT-B21
# Location: Greenland Ice Sheet
# Country: Greenland
# Northernmost_Latitude: 80
# Southernmost_Latitude: 80
# Easternmost_Longitude: -41.14
# Westernmost_Longitude: -41.14
# Elevation: 2185
#---------------------------------------
# Data_Collection
#   Collection_Name: Osman2019NGT-B21MSA
#   First_Year: 1395
#   Last_Year: 1993
#   Time_Unit: CE
#   Core_Length: 84.4425
#   Notes: 
#---------------------------------------
# Chronology_Information 
# Chronology: 
#---------------------------------------
# Variables
# Data variables follow that are preceded by "##" in columns one and two.
# Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data)
#
## depth_mid	depth,,,meters,,,,,N, middle sampling depth
## age_CE	age,,,year Common Era,,,,,N,
## MSA	methanesulfonate,aqueous,,microgram per kilogram,,Ice cores,raw measurements,Ion chromatography,N,
#
#------------------------
# Data
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Value: -999
depth_mid	age_CE	MSA
0.4389	1993.5	2.531251664
0.7878	1992.5	1.600985261
1.1122	1991.5	1.813744688
1.4279	1990.5	1.438460993
1.7920	1989.5	1.706490814
2.1300	1988.5	3.27296035
2.4018	1987.5	3.750860942
2.7335	1986.5	1.902621258
3.0600	1985.5	2.095717365
3.3704	1984.5	2.46973704
3.6482	1983.5	1.963778746
3.9338	1982.5	2.506665107
4.1600	1981.5	1.986171761
4.5642	1980.5	1.770847183
4.7916	1979.5	1.827773665
5.0215	1978.5	2.044079242
5.3400	1977.5	2.167302348
5.5900	1976.5	2.147613735
5.7823	1975.5	1.943600586
6.0648	1974.5	2.119139633
6.3877	1973.5	1.704692034
6.6395	1972.5	1.942243088
6.8958	1971.5	2.053569601
7.2689	1970.5	1.406678416
7.4044	1969.5	1.908848197
7.6289	1968.5	1.860179182
7.9844	1967.5	1.615849995
8.1626	1966.5	1.727360881
8.3966	1965.5	1.8265612
8.6032	1964.5	1.86845
8.7764	1963.5	2.50656
8.9792	1962.5	2.50656
9.1744	1961.5	2.097976674
9.4379	1960.5	2.165305127
9.7432	1959.5	2.173000871
10.0111	1958.5	1.687424316
10.2228	1957.5	1.70839
10.4164	1956.5	2.094659149
10.6389	1955.5	2.580898106
10.8514	1954.5	2.544420197
11.0597	1953.5	2.072757397
11.2248	1952.5	2.23663
11.4308	1951.5	2.377831915
11.6569	1950.5	2.253460136
11.8824	1949.5	2.760342521
12.0044	1948.5	3.151709089
12.2652	1947.5	1.94209
12.6194	1946.5	1.927789004
13.0264	1945.5	1.988379559
13.1415	1944.5	2.127
13.2371	1943.5	2.297183665
13.4279	1942.5	2.573935527
13.5804	1941.5	2.58103
13.6757	1940.5	2.273218704
13.8091	1939.5	2.240276871
14.0185	1938.5	2.628936662
14.1897	1937.5	3.0258
14.3989	1936.5	2.087344952
14.4940	1935.5	2.141035719
14.6841	1934.5	2.2772957
14.8552	1933.5	2.607862908
15.1784	1932.5	2.472623533
15.4446	1931.5	2.558834219
15.6536	1930.5	2.803008793
15.8243	1929.5	2.986616617
15.9756	1928.5	2.61381
16.2394	1927.5	2.4362805
16.5395	1926.5	3.529488591
16.7076	1925.5	3.120004991
16.8938	1924.5	2.431046028
17.0609	1923.5	2.923478149
17.3014	1922.5	3.308023179
17.5773	1921.5	2.246782588
17.6872	1920.5	2.27138
17.7786	1919.5	-999
17.8881	1918.5	1.59543
18.0882	1917.5	2.312634994
18.3957	1916.5	3.733539473
18.6478	1915.5	3.435587296
18.8272	1914.5	3.804900851
19.1309	1913.5	2.840800699
19.2912	1912.5	2.235411521
19.5750	1911.5	2.30648366
19.7341	1910.5	2.671540825
19.8398	1909.5	2.687531412
20.0141	1908.5	2.609622638
20.1176	1907.5	1.78207
20.2544	1906.5	1.987442753
20.4402	1905.5	2.368333716
20.6235	1904.5	2.532118412
20.7388	1903.5	2.81618
20.9665	1902.5	2.437059398
21.2564	1901.5	1.975337806
21.4460	1900.5	1.917866978
21.6691	1899.5	2.183557938
21.7717	1898.5	1.89016
22.0101	1897.5	1.643256415
22.2978	1896.5	2.194984202
22.4494	1895.5	2.21515
22.7021	1894.5	1.819569891
22.8707	1893.5	2.529844397
23.0899	1892.5	2.099242058
23.2585	1891.5	2.19314011
23.3935	1890.5	1.93791
23.5960	1889.5	2.060408458
23.7671	1888.5	2.633450255
23.9611	1887.5	3.60768
24.1064	1886.5	2.440929981
24.2555	1885.5	2.039245412
24.5867	1884.5	2.225401539
24.7711	1883.5	2.433865433
24.9138	1882.5	2.10635
25.1281	1881.5	1.955467102
25.3320	1880.5	1.960567535
25.5958	1879.5	2.114901978
25.7802	1878.5	1.964869318
25.9760	1877.5	1.74218
26.2832	1876.5	1.719787539
26.4436	1875.5	1.88522
26.5554	1874.5	1.991889174
26.7618	1873.5	2.03263682
26.9354	1872.5	2.11434
27.0453	1871.5	1.963208731
27.1701	1870.5	1.75341
27.4174	1869.5	3.244348793
27.6315	1868.5	2.453771228
27.7690	1867.5	1.622350577
27.9834	1866.5	1.61225
28.1366	1865.5	1.468332453
28.2899	1864.5	2.002532986
28.4126	1863.5	3.05293
28.5813	1862.5	2.615373308
28.6734	1861.5	2.13307
28.8269	1860.5	2.283075275
28.9651	1859.5	2.46716
29.0880	1858.5	1.929898215
29.2262	1857.5	1.71811
29.3950	1856.5	1.753733657
29.5789	1855.5	1.935317451
29.7779	1854.5	2.173852928
29.9767	1853.5	2.17542
30.0837	1852.5	2.910545044
30.2821	1851.5	3.010027481
30.4799	1850.5	2.554986604
30.6466	1849.5	2.09343
30.8427	1848.5	3.011617129
30.9630	1847.5	3.59162
31.1577	1846.5	2.080011142
31.3069	1845.5	1.89228393
31.4410	1844.5	2.25115
31.5898	1843.5	2.478633529
31.7237	1842.5	2.81535
31.9019	1841.5	2.248235612
31.9909	1840.5	2.19843
32.1688	1839.5	2.275767929
32.4648	1838.5	2.154918793
32.6864	1837.5	3.15308462
32.7898	1836.5	3.62346
32.8931	1835.5	1.978625232
33.1585	1834.5	2.486584881
33.4088	1833.5	2.311747737
33.6149	1832.5	1.892925364
33.8356	1831.5	2.185080458
34.0563	1830.5	2.499318123
34.1740	1829.5	2.54451
34.3652	1828.5	1.8760613
34.4828	1827.5	1.41914
34.6148	1826.5	1.866538469
34.7757	1825.5	1.989806121
34.9217	1824.5	1.98216
35.0528	1823.5	2.133616201
35.1981	1822.5	2.35875
35.3865	1821.5	2.181721366
35.5744	1820.5	1.89998
35.7761	1819.5	3.361369644
35.8910	1818.5	2.555795569
35.9915	1817.5	2.45316
36.0917	1816.5	1.922545083
36.2347	1815.5	1.8713
36.3346	1814.5	2.603290919
36.4343	1813.5	2.97985
36.6334	1812.5	2.272887356
36.7896	1811.5	1.541353831
36.9029	1810.5	1.64379
37.1292	1809.5	1.794405668
37.3127	1808.5	1.95328
37.5801	1807.5	2.147590013
37.7628	1806.5	2.318685788
37.9453	1805.5	1.922339258
38.0435	1804.5	1.903555067
38.2257	1803.5	1.97766
38.4497	1802.5	1.776033696
38.5754	1801.5	1.819049583
38.6730	1800.5	1.9
38.7844	1799.5	1.82052559
38.9511	1798.5	1.62308
39.1037	1797.5	1.656816406
39.2558	1796.5	1.729912366
39.3939	1795.5	1.85928
39.6144	1794.5	1.764860556
39.7383	1793.5	1.6957
39.8759	1792.5	2.395722807
39.9860	1791.5	2.69108
40.1785	1790.5	1.908198656
40.3159	1789.5	1.82931
40.4257	1788.5	2.395695396
40.7280	1787.5	1.930672924
40.8518	1786.5	1.673792057
40.9756	1785.5	2.50825
41.0719	1784.5	1.974655997
41.1683	1783.5	1.80269
41.2784	1782.5	1.706412422
41.4438	1781.5	1.57068
41.6090	1780.5	2.761060534
41.7052	1779.5	3.24111
41.8698	1778.5	1.216723708
42.0887	1777.5	0.629819496
42.1706	1776.5	0.563542
42.3477	1775.5	1.345160678
42.4971	1774.5	2.114314897
42.6596	1773.5	1.72297
42.8351	1772.5	1.74219931
42.9429	1771.5	1.76301
43.0907	1770.5	1.921277673
43.1980	1769.5	2.02278
43.4266	1768.5	1.550690848
43.5479	1767.5	1.800941085
43.7369	1766.5	2.187962396
43.8181	1765.5	1.47186
43.8993	1764.5	1.47186
44.0621	1763.5	1.613528849
44.2252	1762.5	1.95366
44.4295	1761.5	1.444639391
44.6343	1760.5	1.297837494
44.7848	1759.5	1.198785204
44.9218	1758.5	1.07791
45.0865	1757.5	1.807319268
45.2787	1756.5	2.40381322
45.4428	1755.5	1.70293
45.5380	1754.5	1.699773612
45.6330	1753.5	1.66699
45.8086	1752.5	1.849785136
45.9832	1751.5	2.34456
46.0767	1750.5	1.366350718
46.1971	1749.5	1.15909
46.2910	1748.5	1.912961665
46.4664	1747.5	2.32177
46.6020	1746.5	1.866540766
46.7384	1745.5	1.755233599
46.8891	1744.5	1.96121
47.0546	1743.5	1.967590211
47.1236	1742.5	1.97465
47.3291	1741.5	2.075466348
47.4378	1740.5	2.42926
47.6937	1739.5	2.281816413
47.8403	1738.5	2.416004053
47.9860	1737.5	2.47102
48.1838	1736.5	1.744765142
48.4345	1735.5	1.683369193
48.5402	1734.5	1.908788968
48.6856	1733.5	2.15758
48.8840	1732.5	2.443604621
48.9900	1731.5	2.51653
49.1485	1730.5	2.073435742
49.2671	1729.5	2.019838582
49.3985	1728.5	2.00558
49.6343	1727.5	2.104737076
49.7126	1726.5	2.141058359
49.9080	1725.5	2.21234
50.1288	1724.5	1.662704943
50.3105	1723.5	2.119170391
50.4530	1722.5	3.60865
50.6083	1721.5	2.693677279
50.7635	1720.5	2.022919161
50.8540	1719.5	2.10119
51.0604	1718.5	2.249332263
51.2277	1717.5	2.78825
51.3562	1716.5	2.151820427
51.5487	1715.5	1.719679608
51.6767	1714.5	0.910311
51.7918	1713.5	1.273720934
51.8940	1712.5	1.87497
51.9835	1711.5	1.87497
52.0680	1710.5	0.762232611
52.1560	1709.5	0.494726
52.2680	1708.5	0.494726
52.3620	1707.5	0.63334776
52.4960	1706.5	0.675877
52.6120	1705.5	1.326177183
52.7660	1704.5	1.72831
52.9360	1703.5	1.109542198
53.0500	1702.5	1.835039683
53.1140	1701.5	2.51798
53.2280	1700.5	2.431392511
53.3240	1699.5	1.89107
53.3880	1698.5	1.89107
53.4940	1697.5	1.996593557
53.5820	1696.5	2.17059
53.6820	1695.5	2.17059
53.7960	1694.5	1.89279003
53.9560	1693.5	1.79402
54.0800	1692.5	2.125403042
54.2560	1691.5	2.393035856
54.3620	1690.5	2.91374
54.5120	1689.5	2.558495702
54.6120	1688.5	1.56591
54.7620	1687.5	2.06505988
54.8700	1686.5	3.01431
55.0120	1685.5	2.883679275
55.1300	1684.5	1.48069
55.3020	1683.5	1.490045216
55.4360	1682.5	1.50095
55.5500	1681.5	1.752692804
55.6560	1680.5	1.96756
55.8260	1679.5	1.918034383
56.0080	1678.5	1.808462114
56.1660	1677.5	2.13568
56.3280	1676.5	1.028629871
56.4620	1675.5	0.633687
56.6020	1674.5	1.500130274
56.7700	1673.5	1.852219509
56.9420	1672.5	2.12725
57.0840	1671.5	2.29909328
57.2280	1670.5	2.41356
57.3900	1669.5	2.232472196
57.5460	1668.5	1.98908
57.6840	1667.5	1.744878776
57.7960	1666.5	1.678740177
57.9120	1665.5	1.79619
58.1140	1664.5	1.935495635
58.1880	1663.5	2.00386
58.3680	1662.5	1.990338284
58.5060	1661.5	1.752790967
58.6280	1660.5	1.14487
58.7300	1659.5	1.14487
58.8060	1658.5	2.61247598
58.9540	1657.5	2.83157
59.0780	1656.5	1.780509338
59.2380	1655.5	1.15855
59.4340	1654.5	1.159673767
59.5900	1653.5	1.332260178
59.7620	1652.5	1.82725
59.8820	1651.5	1.469702946
60.0460	1650.5	1.396466984
60.2440	1649.5	1.178397663
60.3560	1648.5	0.982306
60.4900	1647.5	0.982306
60.6460	1646.5	0.770809
60.8500	1645.5	1.436312401
60.9980	1644.5	1.8968
61.1180	1643.5	1.26751325
61.2220	1642.5	1.25774
61.3480	1641.5	1.0233683
61.4380	1640.5	0.95828
61.6040	1639.5	1.106277526
61.7380	1638.5	1.247422428
61.9340	1637.5	1.22324
62.0880	1636.5	1.084396538
62.2160	1635.5	0.990575
62.2760	1634.5	0.990575
62.4480	1633.5	1.304670075
62.6300	1632.5	1.350748924
62.7540	1631.5	0.416669
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