Citation:

palo.20018

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Abstract:

Past water column stratification can be assessed through comparison of the d18O of different planktonic foraminiferal species. The underlying assumption is that different species form their shells simultaneously, but at different depths in the water column. We evaluate this assumption using a sediment trap time-series of Neogloboquadrina pachyderma (s) and Globigerina bulloides from the NW North Atlantic. We determined fluxes, d18O and d13C of shells from two size fractions to assess size-related effects on shell chemistry and to better constrain the underlying causes of isotopic differences between foraminifera in deep-sea sediments. Our data indicate that in the subpolar North Atlantic differences in the seasonality of the shell flux, and not in depth habitat or test size, determine the interspecies Delta d18O. N. pachyderma (s) preferentially forms from early spring to late summer, whereas the flux ofG. bulloides peaks later in the season and is sustained until autumn. Likewise, seasonality influences large and small specimens differently, with large shells settling earlier in the season.

The similarity of the seasonal d18O patterns between the two species indicates that they calcify in an overlapping depth zone close to the surface. However, their d13C patterns are markedly different (>1 per mil). Both species have a seasonally variable offset from d13CDIC that appears to be governed primarily by temperature, with larger offsets associated with higher temperatures. The variable offset from d13CDIC implies that seasonality of the flux affects the fossil d13C signal, which has implications for reconstruction of the past oceanic carbon cycle.

Related to:

Jonkers, Lukas; Brummer, Geert-Jan A; Peeters, Frank J C; van Aken, Hendrik M; de Jong, M Femke (2010): Seasonal stratification, shell flux, and oxygen isotope dynamics of left-coiling N. pachyderma and T. quinqueloba in the western subpolar North Atlantic. Paleoceanography, 25, PA2204, https://doi.org/10.1029/2009PA001849

Coverage:

Median Latitude: 59.280300 * Median Longitude: -39.393100 * South-bound Latitude: 59.247500 * West-bound Longitude: -39.657800 * North-bound Latitude: 59.345700 * East-bound Longitude: -38.863700

Date/Time Start: 2003-08-31T00:00:00 * Date/Time End: 2007-05-19T00:00:00

Minimum DEPTH, water: 2750 m * Maximum DEPTH, water: 2750 m

Event(s):

IRM_1 * Latitude: 59.345700 * Longitude: -38.863700 * Date/Time: 2003-08-31T00:00:00 * Elevation: -3000.0 m * Location: North Atlantic * Method/Device: Trap, sediment (TRAPS)

IRM_3 * Latitude: 59.247700 * Longitude: -39.657800 * Date/Time: 2005-09-21T00:00:00 * Elevation: -3000.0 m * Location: North Atlantic * Method/Device: Trap, sediment (TRAPS)

IRM_4 * Latitude: 59.247500 * Longitude: -39.657800 * Date/Time: 2006-09-05T00:00:00 * Elevation: -3000.0 m * Location: North Atlantic * Method/Device: Trap, sediment (TRAPS)

Comment:

Stable isotope data for small N. pachyderma (s) in samples IRM-1 06-07, 09-10 and 12-13 are average values from both collecting cups.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Sample code/label	Sample label		Jonkers, Lukas
3	DATE/TIME	Date/Time				Geocode
4	Date/time end	Date/time end		Jonkers, Lukas
5	DEPTH, water	Depth water	m			Geocode
6	Neogloboquadrina pachyderma sinistral, flux	N. pachyderma s flux	#/m²/day	Jonkers, Lukas	Calculated	150-200 µm
7	Neogloboquadrina pachyderma sinistral, δ18O	N. pachyderma s δ18O	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	150-250 µm
8	Neogloboquadrina pachyderma sinistral, δ13C	N. pachyderma s δ13C	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	150-250 µm
9	Globigerina bulloides, flux	G. bulloides flux	#/m²/day	Jonkers, Lukas	Calculated	150-250 µm
10	Globigerina bulloides, δ18O	G. bulloides δ18O	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	150-250 µm
11	Globigerina bulloides, δ13C	G. bulloides δ13C	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	150-250 µm
12	Turborotalita quinqueloba, flux	T. quinqueloba flux	#/m²/day	Jonkers, Lukas	Calculated	150-250 µm
13	Turborotalita quinqueloba, δ18O	T. quinqueloba δ18O	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	150-250 µm
14	Turborotalita quinqueloba, δ13C	T. quinqueloba δ13C	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	150-250 µm
15	Neogloboquadrina pachyderma sinistral, flux	N. pachyderma s flux	#/m²/day	Jonkers, Lukas	Calculated	250-315 µm
16	Neogloboquadrina pachyderma sinistral, δ18O	N. pachyderma s δ18O	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	250-315 µm
17	Neogloboquadrina pachyderma sinistral, δ13C	N. pachyderma s δ13C	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	250-315 µm
18	Globigerina bulloides, flux	G. bulloides flux	#/m²/day	Jonkers, Lukas	Calculated	250-315 µm
19	Globigerina bulloides, δ18O	G. bulloides δ18O	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	250-315 µm
20	Globigerina bulloides, δ13C	G. bulloides δ13C	‰ PDB	Jonkers, Lukas	Mass spectrometer, Finnigan, MAT 253	250-315 µm

License:

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

Size:

668 data points

Data

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

1 Event	2 Sample label	3 Date/Time	4 Date/time end	5 Depth water [m]	6 N. pachyderma s flux [#/m²/day] (150-200 µm, Calculated)	7 N. pachyderma s δ18O [‰ PDB] (150-250 µm, Mass spectrometer...)	8 N. pachyderma s δ13C [‰ PDB] (150-250 µm, Mass spectrometer...)	9 G. bulloides flux [#/m²/day] (150-250 µm, Calculated)	10 G. bulloides δ18O [‰ PDB] (150-250 µm, Mass spectrometer...)	11 G. bulloides δ13C [‰ PDB] (150-250 µm, Mass spectrometer...)	12 T. quinqueloba flux [#/m²/day] (150-250 µm, Calculated)	13 T. quinqueloba δ18O [‰ PDB] (150-250 µm, Mass spectrometer...)	14 T. quinqueloba δ13C [‰ PDB] (150-250 µm, Mass spectrometer...)	15 N. pachyderma s flux [#/m²/day] (250-315 µm, Calculated)	16 N. pachyderma s δ18O [‰ PDB] (250-315 µm, Mass spectrometer...)	17 N. pachyderma s δ13C [‰ PDB] (250-315 µm, Mass spectrometer...)	18 G. bulloides flux [#/m²/day] (250-315 µm, Calculated)	19 G. bulloides δ18O [‰ PDB] (250-315 µm, Mass spectrometer...)	20 G. bulloides δ13C [‰ PDB] (250-315 µm, Mass spectrometer...)
IRM_1	IRM-1 A-01	2003-08-31	2003-09-19	2750	485.1	1.88	0.43	40.4	1.11	-1.32	80.84	1.86	-0.37	0.6			21.3	1.82	-0.98
IRM_1	IRM-1 A-02	2003-09-19	2003-10-08	2750	77.5	1.72	0.32	104.2	0.87	-1.30	727.58	2.08	-0.21	0.0			24.2	1.65	-0.88
IRM_1	IRM-1 A-03	2003-10-08	2003-10-27	2750	21.9	1.79	0.24	70.7	1.11	-1.50	520.42	2.24	-0.20	0.0			8.0	1.34	-1.08
IRM_1	IRM-1 A-04	2003-10-27	2003-11-15	2750	7.2	1.55	0.14	2.3	1.57	-1.14	267.37	2.26	-0.39	0.2			1.7	1.59	-0.99
IRM_1	IRM-1 A-05	2003-11-15	2003-12-04	2750	2.5	1.74	0.18	5.1	1.38	-1.56	53.68	2.39	-0.25	0.0			0.8	1.61	-1.11
IRM_1	IRM-1 A-06	2003-12-04	2003-12-23	2750	0.6	1.76	0.02	1.1			54.95	2.53	-0.33	0.0			1.1	1.61	-1.11
IRM_1	IRM-1 A-07	2003-12-23	2004-01-11	2750	1.1	1.76	0.02	0.8			26.74	2.53	-0.33	0.0			0.0
IRM_1	IRM-1 A-08	2004-01-11	2004-01-30	2750	0.6	1.11	-0.03	0.0			3.16	2.55	-0.28
IRM_1	IRM-1 A-09	2004-01-30	2004-02-18	2750	0.4	1.60	-0.27	0.0			0.84	2.42	-0.58
IRM_1	IRM-1 A-10	2004-02-18	2004-03-08	2750	0.4	1.60	-0.27	0.2			1.05	2.42	-0.58
IRM_1	IRM-1 A-11	2004-03-08	2004-03-27	2750	0.0			0.0			0.21
IRM_1	IRM-1 A-12	2004-03-27	2004-04-15	2750	0.6	2.59	0.04	0.0			0.21			0.0			0.0
IRM_1	IRM-1 A-13	2004-04-15	2004-05-04	2750	1.1	2.59	0.04	0.0			0.21			0.0			0.0
IRM_1	IRM-1 A-14	2004-05-04	2004-05-23	2750	22.3	2.51	0.30	0.0			1.26			0.6			0.0
IRM_1	IRM-1 A-15	2004-05-23	2004-06-11	2750	141.5	2.32	0.31	1.7			35.37	3.21	-0.57	2.3	2.35	0.32	0.6
IRM_1	IRM-1 A-16	2004-06-11	2004-06-30	2750	177.5	2.30	0.30	6.7			60.42	3.04	-0.58	5.5	2.66	0.56	8.0	2.15	-0.68
IRM_1	IRM-1 A-17	2004-06-30	2004-07-19	2750	28.4	2.25	0.33	4.2			80.63	2.87	-0.47	0.2			16.2	2.11	-0.57
IRM_1	IRM-1 A-18	2004-07-19	2004-08-07	2750	23.6	2.13	0.23	15.4	1.58	-0.91	131.37	3.01	-0.32	0.8			14.1	1.78	-0.71
IRM_1	IRM-1 A-19	2004-08-07	2004-08-26	2750	33.1	1.81	0.23	8.4	1.51	-0.99	103.37	2.64	-0.41	0.0			26.1	1.84	-0.40
IRM_1	IRM-1 A-20	2004-08-26	2004-09-14	2750	30.3	1.61	0.18	8.7	1.38	-0.73	229.05	2.30	-0.46	0.0			20.4	1.69	-0.42
IRM_3	IRM-3 A-01	2005-09-21	2005-10-07	2750	27.0	1.43	0.08	24.0	1.52	-0.84	1002.00	2.34	-0.33	0.5			47.8	1.58	-0.45
IRM_3	IRM-3 A-02	2005-10-07	2005-10-23	2750	6.5	1.57	-0.11	2.0	1.29	-1.00	42.50	1.81	-0.56	0.0			15.5	1.51	-0.62
IRM_3	IRM-3 A-03	2005-10-23	2005-11-08	2750	9.0	1.68	-0.06	50.0	1.63	-1.16	278.00	2.24	-0.43	0.0			6.0	1.66	-0.57
IRM_3	IRM-3 A-04	2005-11-08	2005-11-24	2750	7.0	1.79	-0.20	80.0	1.65	-0.81	73.00	1.96	-0.70	0.0			2.5	1.84	-0.35
IRM_3	IRM-3 A-05	2005-11-24	2005-12-10	2750	6.8	1.58	-0.05	3.0	1.66	-0.78	61.00	2.28	-0.42	0.0			0.0
IRM_3	IRM-3 A-06	2005-12-10	2005-12-26	2750	0.8	0.93	-0.29	0.3			33.75	1.41	-0.69	0.0			0.0
IRM_3	IRM-3 A-07	2005-12-26	2006-01-11	2750	0.0			0.0			2.75
IRM_3	IRM-3 A-08	2006-01-11	2006-01-27	2750	0.0			0.3			3.25
IRM_3	IRM-3 A-09	2006-01-27	2006-02-12	2750	0.5						1.25			0.0			0.0
IRM_3	IRM-3 A-10	2006-02-12	2006-02-28	2750	0.0						1.75
IRM_3	IRM-3 A-11	2006-02-28	2006-03-16	2750	0.0						0.00
IRM_3	IRM-3 A-12	2006-03-16	2006-04-01	2750	0.3						0.25
IRM_3	IRM-3 A-13	2006-04-01	2006-04-17	2750	10.5	2.29	0.07				1.25			0.0			0.0
IRM_3	IRM-3 A-14	2006-04-17	2006-05-03	2750	89.0	2.31	0.27	0.5			1.25	3.08	-0.75	4.8	2.33	0.12	0.0
IRM_3	IRM-3 A-15	2006-05-03	2006-05-19	2750	305.0	2.31	0.38	2.0	2.46	-1.04	14.00	3.08	-0.39	4.3	2.53	0.51	2.8	2.26	-0.78
IRM_3	IRM-3 A-16	2006-05-19	2006-06-04	2750	303.0	2.31	0.43	1.5			110.00	3.19	-0.44	10.5	2.52	0.47	2.5	2.45	-0.76
IRM_3	IRM-3 A-17	2006-06-04	2006-06-20	2750	141.0	2.29	0.32	1.5			49.00	3.21	-0.54	1.8	2.37	0.37	5.3	2.24	-0.70
IRM_3	IRM-3 A-18	2006-06-20	2006-07-06	2750	56.5	2.28	0.25	3.0	2.05	-1.03	83.50	3.01	-0.57	0.8	2.10	0.22	15.3	2.35	-0.62
IRM_3	IRM-3 A-19	2006-07-06	2006-07-22	2750	45.0	2.13	0.28	5.8	2.32	-0.67	178.00	3.11	-0.56	1.5	2.14	0.46	13.0	2.42	-0.60
IRM_3	IRM-3 A-20	2006-07-22	2006-08-07	2750	77.0	1.90	0.30	8.3	2.25	-0.71	279.00	2.93	-0.50	1.5	2.03	0.43	47.8	2.30	-0.63
IRM_3	IRM-3 A-21	2006-08-07	2006-08-23	2750	207.0	1.87	0.23	5.0	2.09	-0.53	211.00	2.88	-0.34	50.5	1.97	0.40	49.3	2.23	-0.31
IRM_4	IRM-4 A-01	2006-09-05	2006-09-21	2750	324.0	1.67	0.27	8.0	1.62	-0.74	356.00	2.28	-0.30	2.3	1.62	0.39	28.0	1.87	-0.34
IRM_4	IRM-4 A-02	2006-09-21	2006-10-07	2750	476.0	1.47	0.08	6.0			1028.00	2.07	-0.30	0.1			25.4	1.76	-0.61
IRM_4	IRM-4 A-03	2006-10-07	2006-10-23	2750	26.0	1.50	0.08	2.3	1.71	-1.06	366.00	2.13	-0.35	0.0			6.8	1.57	-0.88
IRM_4	IRM-4 A-04	2006-10-23	2006-11-08	2750	18.0	1.63	0.03	3.4	1.49	-1.16	213.00	2.38	-0.53	0.1			4.8	1.66	-0.67
IRM_4	IRM-4 A-05	2006-11-08	2006-11-24	2750	8.0	1.73	0.08	2.0	1.88	-1.13	82.00	2.56	-0.37	0.0			1.8	1.95	-0.82
IRM_4	IRM-4 A-06	2006-11-24	2006-12-10	2750	1.1	1.52	0.09	0.8			25.50	2.30	-0.48	0.0			0.6	2.55	-1.21
IRM_4	IRM-4 A-07	2006-12-10	2006-12-26	2750	1.1	2.20	0.23	0.3			11.25	2.06	-0.54	0.0			0.4
IRM_4	IRM-4 A-08	2006-12-26	2007-01-11	2750	0.8	1.69	0.09	0.0			0.50			0.0			0.0
IRM_4	IRM-4 A-09	2007-01-11	2007-01-27	2750	0.0						0.75
IRM_4	IRM-4 A-10	2007-01-27	2007-02-12	2750	0.1						0.88
IRM_4	IRM-4 A-11	2007-02-12	2007-02-28	2750	0.0						0.38
IRM_4	IRM-4 A-12	2007-02-28	2007-03-16	2750	0.1						0.13
IRM_4	IRM-4 A-13	2007-03-16	2007-04-01	2750	0.0						0.13
IRM_4	IRM-4 A-14	2007-04-01	2007-04-17	2750	4.0	2.41	0.20				0.00			0.0			0.0
IRM_4	IRM-4 A-15	2007-04-17	2007-05-03	2750	58.6	2.52	0.36	0.0			0.63			5.6	2.65	0.43	0.1
IRM_4	IRM-4 A-16	2007-05-03	2007-05-19	2750	102.5	2.52	0.37	0.6			4.00	3.29	-0.34	19.5	2.75	0.56	1.0	2.61	-0.40
IRM_4	IRM-4 A-17	2007-05-19	2007-06-04	2750	1843.0	2.63	0.49				52.50	3.82	-0.41	269.0	2.67	0.50	12.0	2.65	-0.56