Citation:

ngeo1049

Name: (Supplementary Table 1) Mercury isotope values for common and thick-billed murre (Uria aalge, Uria lomvia) eggs from Alaska
Published: 2011
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Atmospheric deposition of mercury to remote areas has increased threefold since pre-industrial times. Mercury deposition is particularly pronounced in the Arctic. Following deposition to surface oceans and sea ice, mercury can be converted into methylmercury, a biologically accessible form of the toxin, which biomagnifies along the marine food chain. Mass-independent fractionation of mercury isotopes accompanies the photochemical breakdown of methylmercury to less bioavailable forms in surface waters. Here we examine the isotopic composition of mercury in seabird eggs collected from colonies in the North Pacific Ocean, the Bering Sea and the western Arctic Ocean, to determine geographical variations in methylmercury breakdown at northern latitudes. We find evidence for mass-independent fractionation of mercury isotopes. The degree of mass-independent fractionation declines with latitude. Foraging behaviour and geographic variations in mercury sources and solar radiation fluxes were unable to explain the latitudinal gradient. However, mass-independent fractionation was negatively correlated with sea-ice cover. We conclude that sea-ice cover impedes the photochemical breakdown of methylmercury in surface waters, and suggest that further loss of Arctic sea ice this century will accelerate sunlight-induced breakdown of methylmercury in northern surface waters.

Project(s):

International Polar Year (2007-2008) (IPY)

Coverage:

Median Latitude: 59.826333 * Median Longitude: -160.271667 * South-bound Latitude: 53.930000 * West-bound Longitude: -170.250000 * North-bound Latitude: 68.870000 * East-bound Longitude: -135.700000

Date/Time Start: 1999-07-07T00:00:00 * Date/Time End: 2002-07-07T00:00:00

Event(s):

Bogoslof_Is * Latitude: 53.930000 * Longitude: -168.030000 * Date/Time: 2000-06-17T00:00:00 * Location: Bering Sea * Method/Device: Biological sample (BIOS)

CapeLisburne * Latitude: 68.870000 * Longitude: -166.110000 * Date/Time: 2002-07-07T00:00:00 * Location: Chukchi Sea * Method/Device: Biological sample (BIOS)

E-Amatuli_Is * Latitude: 58.920000 * Longitude: -152.000000 * Date/Time: 1999-07-07T00:00:00 * Location: Gulf of Alaska * Method/Device: Biological sample (BIOS)

Comment:

Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Sample ID	Sample ID		Point, David	egg ID
5	Species, common name	Species common		Point, David
6	Species	Species		Point, David
7	Sample type	Samp type		Point, David
8	Area/locality	Area		Point, David
9	DATE/TIME	Date/Time			Geocode
10	δ199Hg	δ199Hg	‰	Point, David
11	δ200Hg	δ200Hg	‰	Point, David
12	δ201Hg	δ201Hg	‰	Point, David
13	δ202Hg	δ202Hg	‰	Point, David
14	Δ199Hg	Δ199Hg	‰	Point, David
15	Δ201Hg	Δ201Hg	‰	Point, David

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

473 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Latitude	3 Longitude	4 Sample ID	5 Species common	6 Species	7 Samp type	8 Area	9 Date/Time	10 δ199Hg [‰]	11 δ200Hg [‰]	12 δ201Hg [‰]	13 δ202Hg [‰]	14 Δ199Hg [‰]	15 Δ201Hg [‰]
CapeLisburne	68.870	-166.110	184	Thick-billed Murre	Uria lomvia	egg tissue	Chukchi Sea, Cape Lisburne	2002-07-07	0.43	0.00	0.48	0.10	0.41	0.40
CapeLisburne	68.870	-166.110	180	Thick-billed Murre	Uria lomvia	egg tissue	Chukchi Sea, Cape Lisburne	2002-07-07	0.62	0.20	0.82	0.35	0.53	0.56
CapeLisburne	68.870	-166.110	182	Thick-billed Murre	Uria lomvia	egg tissue	Chukchi Sea, Cape Lisburne	2002-07-07	0.74	0.29	0.99	0.55	0.61	0.58
CapeLisburne	68.870	-166.110	181	Thick-billed Murre	Uria lomvia	egg tissue	Chukchi Sea, Cape Lisburne	2002-07-07	0.62	0.09	0.72	0.33	0.54	0.47
CapeLisburne	68.870	-166.110	183	Thick-billed Murre	Uria lomvia	egg tissue	Chukchi Sea, Cape Lisburne	2002-07-07	0.28	-0.16	0.19	-0.29	0.35	0.41
StLawrence_Is	63.670	-170.250	198	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, St. Lawrence Island	2002-06-20	0.85	0.27	0.95	0.36	0.76	0.68
StLawrence_Is	63.670	-170.250	193	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, St. Lawrence Island	2002-06-20	1.19	0.35	1.19	0.51	1.06	0.81
E-Amatuli_Is	58.920	-152.000	32	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, East Amatuli Island	1999-07-07	1.67	0.83	2.17	1.45	1.30	1.07
E-Amatuli_Is	58.920	-152.000	40	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, East Amatuli Island	1999-07-07	1.38	0.52	1.67	0.94	1.14	0.97
E-Amatuli_Is	58.920	-152.000	37	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, East Amatuli Island	1999-07-07	1.39	0.39	1.56	0.67	1.22	1.05
E-Amatuli_Is	58.920	-152.000	33	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, East Amatuli Island	1999-07-07	1.40	0.46	1.56	0.75	1.21	1.00
E-Amatuli_Is	58.920	-152.000	39	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, East Amatuli Island	1999-07-07	0.95	0.04	0.91	0.13	0.91	0.81
StLazaria_Is	56.968	-135.700	12	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	1999-07-23	1.60	0.75	2.05	1.36	1.25	1.03
StLazaria_Is	56.968	-135.700	10	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	1999-07-23	1.54	0.62	1.99	1.17	1.24	1.10
StLazaria_Is	56.968	-135.700	17	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	1999-07-23	1.59	0.68	1.95	1.17	1.30	1.07
StLazaria_Is	56.968	-135.700	18	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	1999-07-23	1.54	0.66	1.98	1.20	1.24	1.07
StLazaria_Is	56.968	-135.700	19	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	1999-07-23	1.55	0.58	1.86	1.13	1.26	1.00
StLazaria_Is	56.968	-135.700	72	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	1999-07-23	1.36	0.50	1.67	0.86	1.14	1.02
StLazaria_Is	56.968	-135.700	73	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	1.46	0.44	1.61	0.82	1.25	0.99
StLazaria_Is	56.968	-135.700	74	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	1.42	0.43	1.58	0.69	1.24	1.06
StLazaria_Is	56.968	-135.700	76	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	1.29	0.42	1.53	0.75	1.10	0.97
StLazaria_Is	56.968	-135.700	75	Common Murre	Uria aalge	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	0.86	-0.18	0.66	-0.24	0.92	0.84
StLazaria_Is	56.968	-135.700	85	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	1.42	0.52	1.76	0.95	1.18	1.05
StLazaria_Is	56.968	-135.700	84	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	1.16	0.28	1.26	0.49	1.03	0.89
StLazaria_Is	56.968	-135.700	86	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	1.56	0.45	1.69	0.77	1.36	1.11
StLazaria_Is	56.968	-135.700	78	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2001-07-10	0.86	-0.08	0.67	-0.22	0.92	0.83
StLazaria_Is	56.968	-135.700	134	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2002-07-06	1.55	0.66	1.97	1.18	1.25	1.07
StLazaria_Is	56.968	-135.700	133	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2002-07-06	1.45	0.62	1.82	1.06	1.18	1.02
StLazaria_Is	56.968	-135.700	135	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2002-07-06	1.51	0.62	1.94	1.12	1.22	1.09
StLazaria_Is	56.968	-135.700	139	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2002-07-06	1.37	0.45	1.62	0.77	1.17	1.04
StLazaria_Is	56.968	-135.700	136	Thick-billed Murre	Uria lomvia	egg tissue	Gulf of Alaska, St. Lazaria Island	2002-07-06	1.24	0.36	1.38	0.60	1.09	0.92
StGeorge_Is	56.600	-169.540	127	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, St. George Island	2002-07-02	1.32	0.38	1.41	0.48	1.20	1.05
StGeorge_Is	56.600	-169.540	124	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, St. George Island	2002-07-02	0.98	-0.02	0.80	-0.04	0.99	0.83
StGeorge_Is	56.600	-169.540	130	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, St. George Island	2002-07-02	0.58	-0.47	0.29	-0.77	0.78	0.87
Bogoslof_Is	53.930	-168.030	66	Common Murre	Uria aalge	egg tissue	Bering Sea, Bogoslof Island	2000-06-17	1.29	0.22	1.29	0.23	1.23	1.12
Bogoslof_Is	53.930	-168.030	67	Common Murre	Uria aalge	egg tissue	Bering Sea, Bogoslof Island	2000-06-17	1.41	0.45	1.44	0.54	1.27	1.03
Bogoslof_Is	53.930	-168.030	63	Common Murre	Uria aalge	egg tissue	Bering Sea, Bogoslof Island	2000-06-17	0.68	-0.38	0.34	-0.84	0.90	0.97
Bogoslof_Is	53.930	-168.030	64	Common Murre	Uria aalge	egg tissue	Bering Sea, Bogoslof Island	2000-06-17	1.02	0.04	0.88	-0.11	1.05	0.96
Bogoslof_Is	53.930	-168.030	52	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, Bogoslof Island	2000-06-18	1.13	0.12	1.08	0.26	1.06	0.88
Bogoslof_Is	53.930	-168.030	58	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, Bogoslof Island	2000-06-18	1.14	0.23	1.17	0.31	1.06	0.93
Bogoslof_Is	53.930	-168.030	54	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, Bogoslof Island	2000-06-18	1.10	0.15	0.96	0.17	1.05	0.83
Bogoslof_Is	53.930	-168.030	57	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, Bogoslof Island	2000-06-18	1.16	0.32	1.29	0.56	1.02	0.87
Bogoslof_Is	53.930	-168.030	49	Thick-billed Murre	Uria lomvia	egg tissue	Bering Sea, Bogoslof Island	2000-06-18	0.77	-0.26	0.42	-0.32	0.85	0.66