Citation:

2005PA001207

Name: (Table 3) Stable oxagen isotope record of planktonic foraminifera from Central Walvish Ridge
Published: 2006
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Above the Walvis Ridge, in the SE Atlantic Ocean, we collected living plantkic foraminifera from the upper water column using depth stratified plantkon tows. The oxygen isotope composition (d18Oc) in shells of foraminifera and shell concentration profiles show seasonal and depth habitats of individual species. The tow results are compared with the average annual deposition d18Oc from sediment traps and the interannual average d18Oc of fossil specimens in top sediments at the same site. The species Globigerinita glutinata best reflects the austral winter/spring sea surface temperature (SST). Its d18Oc signal in top sediments remains pristine. In contrast, tow results also show that Globigerinoides ruber continues to calcify below the surface mixed layer (SML), i.e., down to the deep chlorophyll maximum (DCM); hence its d18Oc signature of exported specimens reflects the SST only when SML incorporates the DCM. Deep tow and sediment trap results show that both Globorotalia truncatulinoides and Globorotalia inflata record the temperature between 150 and 350 m, depending on the season and the shell size. However, for all fossil taxa in sediments apart from Globigerinita glutinata, we observe a positive d18Oc shift with respect to the sediment trap and plankton tow values, likely related to the interannual flux changes and deep encrustation.

Further details:

Kim, Sang-Tae; O'Neil, James R (1997): Equilibrium and nonequilibrium oxygen isotope effects in synthetic carbonates. Geochimica et Cosmochimica Acta, 61(16), 3461-3475, https://doi.org/10.1016/S0016-7037(97)00169-5

Coverage:

Median Latitude: -27.028638 * Median Longitude: 3.890527 * South-bound Latitude: -27.100170 * West-bound Longitude: 3.853000 * North-bound Latitude: -26.961830 * East-bound Longitude: 3.971000

Date/Time Start: 2000-02-19T00:00:00 * Date/Time End: 2001-02-02T00:00:00

Minimum DEPTH, water: 5.0 m * Maximum DEPTH, water: 750.0 m

Event(s):

154P03 (MARE-0) * Latitude Start: -27.016830 * Longitude Start: 3.868830 * Latitude End: -27.100170 * Longitude End: 3.927500 * Date/Time: 2000-02-19T00:00:00 * Location: Walvis Ridge * Method/Device: Net (NET)

174P03 (MARE-III) * Latitude Start: -27.014500 * Longitude Start: 3.858500 * Latitude End: -27.068330 * Longitude End: 3.864330 * Date/Time: 2001-02-02T00:00:00 * Location: Walvis Ridge * Method/Device: Net (NET)

1086-1089 (MARE-II) * Latitude Start: -27.010170 * Longitude Start: 3.853000 * Latitude End: -26.961830 * Longitude End: 3.971000 * Date/Time: 2000-07-30T00:00:00 * Location: Walvis Ridge * Method/Device: Net (NET)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	DEPTH, water	Depth water	m			Geocode
3	Globigerinoides trilobus, δ18O	G. trilobus δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	fine (200-300µm)
4	Globigerinoides trilobus, δ18O	G. trilobus δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	coarse (350-450 µm)
5	Globigerinoides ruber, δ18O	G. ruber δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	fine (200-300µm)
6	Globigerinoides ruber, δ18O	G. ruber δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	coarse (350-450 µm)
7	Globigerinita glutinata, δ18O	G. glutinata δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	fine (200-300µm)
8	Globorotalia inflata, δ18O	G. inflata δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	fine (200-300µm)
9	Globorotalia inflata, δ18O	G. inflata δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	coarse (350-450 µm)
10	Globorotalia truncatulinoides sinistral, δ18O	G. truncatulinoides s δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	fine (200-300µm)
11	Globorotalia truncatulinoides sinistral, δ18O	G. truncatulinoides s δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	coarse (350-450 µm)
12	Globorotalia truncatulinoides dextral, δ18O	G. truncatulinoides d δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	fine (200-300µm)
13	Globorotalia truncatulinoides dextral, δ18O	G. truncatulinoides d δ18O	‰ PDB	Loncaric, Neven	Mass spectrometer Finnigan MAT 252	coarse (350-450 µm)
14	δ18O	δ18O	‰	Loncaric, Neven		equation of Kim and O'Neil (1997)
15	δ18O, water	δ18O H2O	‰ SMOW	Loncaric, Neven
16	Temperature, water	Temp	°C	Loncaric, Neven
17	Salinity	Sal		Loncaric, Neven

License:

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

Size:

239 data points

Data

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

1 Event	2 Depth water [m]	3 G. trilobus δ18O [‰ PDB] (fine (200-300µm))	4 G. trilobus δ18O [‰ PDB] (coarse (350-450 µm))	5 G. ruber δ18O [‰ PDB] (fine (200-300µm))	6 G. ruber δ18O [‰ PDB] (coarse (350-450 µm))	7 G. glutinata δ18O [‰ PDB] (fine (200-300µm))	8 G. inflata δ18O [‰ PDB] (fine (200-300µm))	9 G. inflata δ18O [‰ PDB] (coarse (350-450 µm))	10 G. truncatulinoides s δ18O [‰ PDB] (fine (200-300µm))	11 G. truncatulinoides s δ18O [‰ PDB] (coarse (350-450 µm))	12 G. truncatulinoides d δ18O [‰ PDB] (fine (200-300µm))	13 G. truncatulinoides d δ18O [‰ PDB] (coarse (350-450 µm))	14 δ18O [‰] (equation of Kim and O'Neil (1...)	15 δ18O H2O [‰ SMOW]	16 Temp [°C]	17 Sal
154P03	5.0	-1.59	-1.37	-1.65	-1.63								-1.24	0.24	22.23	35.72
154P03	12.5	-1.60	-1.42	-1.64	-1.56								-1.24	0.24	22.22	35.72
154P03	37.5	-1.33	-1.24	-1.50	-1.52								-1.15	0.24	21.77	35.72
154P03	62.5	-0.96	-0.92	-1.32	-1.39				-0.53				-0.43	0.20	18.13	35.63
154P03	87.5	-1.39	-1.16	-1.08	-1.43								-0.21	0.17	16.97	35.58
154P03	125.0	-1.25	-1.08	-0.89	-1.32					0.36			0.01	0.13	15.76	35.49
154P03	225.0	-1.46	-1.22	-1.37					0.21	0.25			0.38	-0.06	13.21	35.14
154P03	400.0	-1.18		-1.05	-1.10					0.76			0.90	-0.23	10.09	34.79
154P03	650.0												1.75	-0.46	5.46	34.35
1086-1089	12.5			-0.73		-0.43	-0.42	-0.14	-0.37	-0.32	-0.37	-0.22	-0.42	0.33	18.70	35.88
1086-1089	37.5			-0.65		-0.38	-0.36	-0.13	-0.47	-0.28	-0.39	-0.31	-0.42	0.33	18.71	35.88
1086-1089	62.5			-0.59		-0.35	-0.43	-0.17	-0.52	-0.29	-0.42	-0.12	-0.43	0.33	18.71	35.88
1086-1089	87.5			-0.52		-0.43	-0.46	-0.24	-0.41	-0.22	-0.50	-0.24	-0.42	0.32	18.67	35.87
1086-1089	125.0			-0.46		-0.24	-0.49	-0.11	-0.34	-0.31	-0.34	-0.10	-0.27	0.22	17.45	35.67
1086-1089	175.0			-0.62		-0.39	-0.19	0.06	-0.50	0.00	-0.47	-0.05	0.05	0.12	15.53	35.48
1086-1089	250.0			-0.65		-0.35	-0.24	0.01	0.20	0.14	-0.26	-0.15	0.37	-0.04	13.34	35.18
1086-1089	400.0					-0.37	-0.02	0.20	0.14	0.68	0.13	0.43	0.86	-0.21	10.39	34.84
1086-1089	750.0					-0.27	0.04	0.19		0.65		0.20	1.93	-0.44	4.78	34.39
174P03	12.5	-1.33											-1.18	0.40	22.73	36.03
174P03	27.5	-1.09					0.03						-1.18	0.40	22.70	36.03
174P03	62.5	-1.10		-1.08			-0.01		-0.31				-0.43	0.25	18.40	35.74
174P03	87.5			-0.51					0.03				-0.26	0.24	17.53	35.71
174P03	125.0	-1.22		-0.02			-0.36		-0.08	0.37			-0.08	0.19	16.45	35.62
174P03	175.0	-1.21					0.03		0.22	0.28			0.26	0.02	14.12	35.29
174P03	250.0	-1.25					0.14		0.09	0.46			0.50	-0.08	12.55	35.10
174P03	400.0	-1.23					0.40			0.81			0.99	-0.25	9.65	34.76
174P03	650.0	-0.89					0.60			0.75			1.79	-0.46	5.31	34.36