Citation:

338751a0

Name: Ba/Ca ratios in benthic foraminifera from recent core tops
Creator: David W Lea
Published: 1989
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The carbon isotope ratio (delta13C) and cadmium content (Cd/Ca) of benthic foraminifera shells have been used to reconstruct deep-water circulation patterns of the glacial oceans. These tracers co-vary with phosphorus in the modern ocean because they are nearly quantitatively regenerated from sinking biological debris in the upper water column. Hence they can be used to reconstruct the distribution of labile nutrients in glacial water masses. Independent constraints on glacial deep-ocean circulation patterns could be provided by a tracer of the distribution of silica and alkalinity, the deeply regenerated constituents of planktonic hard parts. Barium shares key aspects of its behaviour with these refractory nutrients because it is removed from solution in surface waters and incorporated into sinking particles which slowly dissolve deep in the water column and in the sediments. The fractionation of Ba between deep-water masses of the major ocean basins is largely controlled by thermohaline circulation patterns, so Ba conforms to different boundary conditions from Cd and 13C. As Ba substitutes into trigonal carbonates, it is a potential palaeoceano-graphic tracer if the Ba content of foraminifera shells reflects ambient dissolved Ba concentrations. Here we present data from Recent core-top benthic foraminifera which indicate that the Ba content of some recent calcitic benthic foraminifera does co-vary with bottom-water Ba.

Coverage:

Median Latitude: 12.677898 * Median Longitude: -21.743405 * South-bound Latitude: -54.550000 * West-bound Longitude: -106.183300 * North-bound Latitude: 78.000000 * East-bound Longitude: 158.800000

Minimum DEPTH, sediment/rock: 0.010 m * Maximum DEPTH, sediment/rock: 0.160 m

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	LATITUDE	Latitude			Geocode
2	LONGITUDE	Longitude			Geocode
3	Sample code/label	Sample label		Lea, David W	* denotes cores with > 15 cm Holocene sediment
4	DEPTH, sediment/rock	Depth sed	m		Geocode
5	Depth, top/min	Depth top	m	Lea, David W
6	Depth, bottom/max	Depth bot	m	Lea, David W
7	Depth, bathymetric	Bathy depth	m	Lea, David W
8	Barium	Ba	µmol/l	Lea, David W
9	Barium/Calcium ratio	Ba/Ca	µmol/mol	Lea, David W	Cibicidoides wuellerstorfi
10	Standard deviation	Std dev	±	Lea, David W	Cibicidoides wuellerstorfi
11	Barium/Calcium ratio	Ba/Ca	µmol/mol	Lea, David W	Cibicidoides kullenbergi
12	Standard deviation	Std dev	±	Lea, David W	Cibicidoides kullenbergi
13	Barium/Calcium ratio	Ba/Ca	µmol/mol	Lea, David W	Uvigerina spp.
14	Standard deviation	Std dev	±	Lea, David W	Uvigerina spp.

License:

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

Size:

288 data points

Data

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

1 Latitude	2 Longitude	3 Sample label (* denotes cores with > 15 cm ...)	4 Depth sed [m]	5 Depth top [m]	6 Depth bot [m]	7 Bathy depth [m]	8 Ba [µmol/l]	9 Ba/Ca [µmol/mol] (Cibicidoides wuellerstorfi)	10 Std dev [±] (Cibicidoides wuellerstorfi)	11 Ba/Ca [µmol/mol] (Cibicidoides kullenbergi)	12 Std dev [±] (Cibicidoides kullenbergi)	13 Ba/Ca [µmol/mol] (Uvigerina spp.)	14 Std dev [±] (Uvigerina spp.)
-54.5500	-77.8500	V18-68*	0.110	0.10	0.12	3972	0.113	3.43				3.94
-43.5167	79.8667	RC11-120	0.060	0.05	0.07	3135	0.093	3.41
-32.0333	-36.1833	All107 65GGC	0.055	0.04	0.07	2795	0.066	2.15
-31.9167	-36.2000	All107 67GGC	0.010	0.00	0.02	2587	0.065	1.89	0.06
-31.6667	-36.0167	All107 69GGC	0.060	0.05	0.07	2158	0.068					2.26
-31.6000	-35.9833	All107 70GGC	0.030	0.02	0.04	2079	0.068	2.20				2.04
-31.5167	-35.9333	All107 71GGC	0.010	0.00	0.02	1887	0.070	2.24				2.00
-29.3167	-86.2333	TR163-28	0.015	0.01	0.02	3200	0.138					4.09
-10.0667	-12.8167	V22-174*	0.100	0.09	0.11	2630	0.078					1.94
-7.4167	-89.1667	All54 5PG	0.030	0.02	0.04	4165	0.136	4.18				4.16
-3.9500	-85.9667	TR163-31B*	0.060	0.01	0.11	3210	0.136	4.41	0.24	4.50		4.02	0.47
-2.4833	-82.9833	TR163-32	0.030	0.02	0.04	2890	0.137			5.04		3.93	0.15
-2.2500	-86.5833	TR163-27	0.025	0.02	0.03	3180	0.138					4.66
-0.3667	-106.1833	KNR73 3PC*	0.055	0.05	0.06	3606	0.137	4.95
0.4333	158.8000	V24-109	0.065	0.05	0.08	2367	0.139	3.76
2.4667	-19.7333	EN66 32GGC*	0.015	0.00	0.03	5003	0.079	3.00
3.0833	-20.0167	EN66 26GGC	0.020	0.01	0.03	4745	0.079	2.86
4.2333	-20.6333	EN66 21GGC*	0.075	0.03	0.12	3995	0.077	2.75		2.35
4.3167	-20.2167	EN66 36GGC	0.025	0.02	0.03	4270	0.077	2.45
4.9167	-20.5000	EN66 38GGC	0.030	0.02	0.04	2931	0.073	2.31		2.39		2.56
5.2667	-21.7167	EN66 44GGC	0.015	0.01	0.02	3428	0.075	2.89		2.72
5.4667	-21.1333	EN66 16GGC	0.020	0.01	0.03	3152	0.075	2.79		2.87
5.6833	-87.2333	TR163-14	0.040	0.03	0.05	2365	0.135	4.12
6.6500	-21.9000	EN66 10GGC	0.015	0.01	0.02	3527	0.076	2.58		2.28
14.1667	-18.5833	V22-197*	0.155	0.14	0.17	3167	0.074	3.10				2.80
14.5833	-19.6667	V22-198	0.050	0.04	0.06	1082	0.064			2.52
16.5333	-74.8000	KNR64 5PG	0.070	0.06	0.08	3047	0.057	2.26		2.42
28.5333	134.1333	V28-304	0.075	0.06	0.09	2942	0.142	3.69
31.9000	-64.3000	OC173 G	0.050	0.04	0.06	4469	0.067	2.16	0.10
36.1000	7.1667	CHN82 1PC	0.030	0.02	0.04	830	0.048					2.18
41.6333	-27.3333	CHN82 3PC	0.145	0.13	0.16	2525	0.052	1.77
41.7167	-32.8500	CHN82 4PC*	0.010	0.00	0.02	3427	0.057	2.44		2.26	0.01
41.8500	-26.4500	CHN82 9PC	0.085	0.07	0.10	2830	0.053	1.85
42.3833	-31.8000	CHN82 11PC*	0.035	0.01	0.06	3209	0.056	2.25		2.18	0.06
42.3833	-23.5167	10S82 PCS01	0.030	0.02	0.04	3540	0.063			2.54
43.2333	-28.1333	CHN82 15PC	0.040	0.03	0.05	2155	0.051	1.98	0.02	2.63	0.16
43.2833	-29.8333	CHN82 21PC	0.060	0.04	0.08	2103	0.050	1.92		2.67
43.5000	-29.8667	CHN82 20PC*	0.055	0.04	0.07	3070	0.054	1.82		2.52	0.04
48.6667	147.4000	V32-159	0.160	0.15	0.17	1235	0.112						2.94
66.6000	1.1167	V27-86*	0.065	0.05	0.08	2900	0.052	1.90
68.0333	-6.1167	V28-56	0.035	0.03	0.04	2941	0.052	1.97
72.1833	8.5667	V27-60	0.065	0.05	0.08	2525	0.050	2.11
78.0000	2.4167	PS21295-4*	0.015	0.01	0.02	3112	0.047	2.03