Vertical distributions of Iodine-129 and iodide in the Chukchi Sea and Bering Sea

Figures & data

Figure 1. Sampling locations of C255 Cruise by the training ship Oshoro-Maru of Hokkaido University during July 2013.

K. Miwa: Vertical distribution of ¹²⁹I and Iodide in Chukchi Sea and Bering Sea

Figure 2. Water mass structure of the Chukchi Sea and Bering Sea between during July 2013 with the definition of 5 types of water masses by Danielson [25].

K. Miwa: Vertical distribution of ¹²⁹I and Iodide in Chukchi Sea and Bering Sea

Table 1. Temperature (°C) and salinity range in each water mass by Danielson et al. [25].

Water mass	Temperature limits	Salinity limits
Alaskan Coastal Water (ACW)	7 < T < 12	20 < S < 32
Bernig−Chukchi Winter Water (BCWW)	−2 < T < 0	30 < S < 33.5
Bernig−Chukchi Summer Water (BCSW)	0 < T < 7	30 < S < 33.5
Melting Water (MW)	−2 < T < 7	25 < S < 30
Atlantic Water (AtlW)	−2 < T < 1	33.5 < S < 35

Figure 3. Sectional distribution maps of potential temperature and salinity. Vertically plotted black dots at each station mean sampling depth. ((a) St. 32–St. 46 in Northern Chukchi Shelf, (b) St. 7–St. 41 between Bering Shelf and Northern Chukchi Shelf, (c) St. 1–St. 6 in Bering Shelf).

K. Miwa: Vertical distribution of ¹²⁹I and Iodide in Chukchi Sea and Bering Sea

Figure 4. Depth profiles of ¹²⁹I ((a) St. 1–St. 6 in Bering Shelf, (b) St. 7–St. 41 in Southern Chukchi Shelf, (c) St. 32–St. 46 in Northern Chukchi Shelf).

K. Miwa: Vertical distribution of ¹²⁹I and Iodide in Chukchi Sea and Bering Sea

Table 2. Range of ¹²⁹I concentrations and concentrations of ¹²⁹I at the surface with location information (Latitude and Longitude), salinity, and potential temperature.

					^129I (×10^7 atoms L^−1)
Cruise	Station	Location	Latitude (°N)	Longitude (°W)	Conc. Range	Surface Conc.	Salinity	Potential Temperature (°C)
C255	2	Bering Shelf	62.54	174.49	1.75–2.90	1.76 ± 0.14	31.17	6.14
	7		63.66	165.60	1.84–2.19	1.84 ± 0.16	30.94	5.38
	8		63.90	166.21	-	1.83 ± 0.20	31.41	6.90
	9		64.17	166.82	1.65–2.03	1.65 ± 0.17	31.25	6.56
	10		64.42	167.42	-	1.40 ± 0.15	30.84	5.94
	14		65.01	169.08	1.44–2.22	1.44 ± 0.17	32.31	3.38
	16		65.50	168.92	-	1.59 ± 0.21	32.00	3.04
	17	Southern Chukchi Shelf	66.18	168.92	1.30–1.85	1.73 ± 0.17	32.11	2.78
	18		66.64	168.93	1.63–2.05	1.74 ± 0.09	31.91	5.26
	19		67.09	168.89	-	1.71 ± 0.12	32.19	4.14
	20		67.64	168.96	-	1.63 ± 0.22	32.27	2.66
	28		67.68	166.94	-	1.94 ± 0.19	32.05	5.93
	29		67.67	167.96	-	1.37 ± 0.14	32.07	4.16
	31	Northern Chukchi Shelf	68.52	168.56	1.53–2.01	1.55 ± 0.20	32.26	4.04
	39		71.01	167.17	1.42–1.72	1.64 ± 0.19	31.21	4.85
	41		71.51	167.29	1.38–2.10	2.10 ± 0.25	30.92	4.24
	44		71.05	164.46	1.20–1.74	1.74 ± 0.20	29.89	2.42
	45		70.62	161.54	1.55–2.35	1.55 ± 0.22	32.34	0.15
	46		70.76	161.27	0.89–2.38	1.51 ± 0.21	31.95	0.14

Figure 5. Plots of ¹²⁹I concentration versus salinity for the surface waters in MW. 2013–2015 data are picked from Nagai et al. [9], and plotted with the data of this research.

K. Miwa: Vertical distribution of ¹²⁹I and Iodide in Chukchi Sea and Bering Sea

Figure 6. Sectional distribution maps of iodide (I⁻) concentration (nM) and dissolved oxygen (mL/L). Vertically plotted black dots at each station mean sampling depth. ((a) St. 32–St. 46 in Northern Chukchi Shelf, (b) St. 7–St. 41 between Bering Shelf and Northern Chukchi Shelf, (c) St. 1–St. 6 in Bering Shelf).

K.Miwa: Vertical distribution of ¹²⁹I and Iodide in Chukchi Sea and Bering Sea

Table 3. Iodide concentration range and iodide concentration in bottom layer (5 m from seafloor).

				Iodide (I^−)
Station	Location	Latitude (°N)	Longitude (°W)	Conc. Range (nM)	Bottom Conc. (nM)
1	Bering Shelf	62.06	175.22	55–157	66
2		62.54	174.49	21–112	112
3		62.91	173.28	30–93	30
4		62.89	172.04	67–110	100
5		62.65	171.29	41–100	59
6		62.51	170.05	46–100	100
7		63.66	165.60	92–122	122
8		63.90	166.21	51–127	127
9		64.17	166.82	52–89	89
10		64.42	167.42	29–145	145
14		65.01	169.08	10–60	60
16		65.50	168.92	31–85	59
17	Southern Chukchi Shelf	66.18	168.92	44–67	67
18		66.64	168.93	64–116	116
20		67.64	168.96	68–104	100
31	Northern Chukchi Shelf	68.52	168.56	74–118	74
32		69.83	167.34	18–83	18
33		69.82	166.32	36–93	80
34		69.82	165.33	53–77	53
35		70.10	164.90	18–50	50
37		70.42	163.50	60–100	100
38		70.51	162.00	56–118	108
39		71.01	167.17	42–85	42
40		71.44	167.26	33–97	97
41		71.51	167.29	38–79	41
45		70.62	161.54	44–111	70
46		70.76	161.27	37–100	37

Danielson SL, Eisner L, Ladd C, et al. A comparison between late summer 2012 and 2013 water masses, macronutrients, and phytoplankton standing crops in the northern Bering and Chukchi Seas. Deep-Sea Res. 2017;135:7–26.

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Nagai H, Kudo A, Yamagata T, et al. The 2013-15 temporal variation in the 129I concentration in seawater in the southern Canada Basin. Nucl Instrum Methods Phys Res B. 2019;455:305–310.

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