Citation:

PANGAEA.934195

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Abstract:

Estimates of the C37 total (ng/gram dry weight sediment) and the relative proportions of C37:2/C38:2 were performed at Brown University, USA. The C37 total (ng/gram dry weight sediment) was derived by normalizing these areas to the peak areas of the internal C36 and C37 n-alkane standards and dividing by the weight of the sample extracted. Gas chromatography and column conditions were optimized to allow for accurate quantification of the four C38 alkenones (we found that daily trimming of the chromatographic column and regular maintenance of the GC inlet is essential to avoid “drift” in the column retention of C38 alkenones relative to the C37 alkenones). Long-term laboratory analytical error, estimated from replicate extractions and gas chromatographic analyses of a composite sediment standard is equivalent in temperature to ±0.1 °C and to a relative error of 10 % in quantifying C37. The relative reproducibility of the C37:C38 indices was approximately 3% (N = 12 replicates). We use the C37 total and the relative proportions of C37:2/C38:2 as paleoproductivity proxy.

Supplement to:

Maiorano, Patrizia; Herbert, Timothy D; Marino, Maria; Bassinot, Franck; Bazzicalupo, Pietro; Bertini, Adele; Girone, Angela; Nomade, Sébastien; Ciaranfi, Neri (2021): Paleoproductivity Modes in Central Mediterranean During MIS 20—MIS 18: Calcareous Plankton and Alkenone Variability. Paleoceanography and Paleoclimatology, 36(8), https://doi.org/10.1029/2021PA004259

Coverage:

Latitude: 40.294900 * Longitude: 16.567800

Event(s):

Montalbano_Jonico * Latitude: 40.294900 * Longitude: 16.567800 * Method/Device: Outcrop sample (OUTCROP)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	AGE	Age	ka BP	Maiorano, Patrizia	Geocode
2	Alkenone, C37	C37	ng/g	Maiorano, Patrizia
3	Alkenone, C37:2/C38:2 ratio	C37:2/C38:2		Maiorano, Patrizia

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

319 data points

Data

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

1 Age [ka BP]	2 C37 [ng/g]	3 C37:2/C38:2
799.75	53.13	0.89
799.33	52.15	0.86
798.91	62.28	0.92
798.48	58.97	0.93
798.05	54.58	0.98
797.62	62.43	1.00
796.76	60.09	0.92
796.32	55.10	0.96
795.68	67.43	0.91
795.26	68.11	0.93
794.86	55.92	0.86
794.29	55.50	0.89
793.95	33.67	0.81
793.63	51.89	0.81
793.33	21.83	0.82
793.04	51.74	0.85
792.75	54.12	0.88
792.47	64.17	0.92
792.04	91.06	0.91
791.76	103.30	0.91
791.47	78.33	0.87
791.19	71.48	0.91
790.91	57.48	0.90
790.62	117.73	0.86
790.34	57.58	0.88
790.06	58.72	0.85
789.77	64.87	0.88
789.49	57.06	0.90
789.20	53.23	0.86
788.92	89.21	0.89
788.64	56.98	0.87
788.35	31.65	0.85
788.07	50.75	0.87
787.78	48.24	0.82
787.50	57.78	0.88
787.22	75.34	0.92
786.79	86.02	0.85
786.51	92.66	0.84
786.22	95.74	0.85
785.92	118.51	0.86
785.61	85.57	0.85
785.28	115.72	0.92
784.93	114.99	0.92
784.55	176.77	1.02
784.14	159.77	1.03
783.73	224.39	1.01
783.30	266.90	1.07
782.87	333.71	1.15
782.66	306.95	1.12
782.44	359.22	1.17
782.01	402.17	1.13
781.80	343.05	1.12
781.15	473.36	1.16
780.73	224.31	1.01
780.31	371.16	1.14
779.91	362.73	1.14
779.51	355.33	1.11
779.11	385.30	1.17
778.72	280.70	1.14
778.32	178.69	0.99
777.92	428.99	1.14
777.51	284.66	1.06
777.12	425.30	1.09
776.72	365.48	1.10
776.32	315.91	1.01
775.93	275.47	1.00
775.55	305.98	1.04
775.17	340.53	1.01
774.81	327.39	1.02
774.47	126.39	0.91
774.16	92.54	0.92
773.92	133.38	0.92
773.71	191.15	0.91
773.51	304.35	0.97
773.33	240.49	0.90
773.14	150.37	0.89
772.96	40.55	0.71
772.77	106.45	0.78
772.58	81.34	0.88
772.40	119.37	0.95
772.21	155.75	0.97
772.03	198.68	1.01
771.84	253.29	1.01
771.66	85.41	0.91
771.48	255.32	1.01
771.29	264.69	1.02
771.12	246.78	1.02
770.88	224.65	1.01
770.07	21.01	0.77
769.85	67.69	0.89
769.64	103.42	0.96
769.45	100.26	0.88
769.26	98.01	1.09
769.07	115.86	1.06
768.89	72.18	0.86
768.70	60.48	0.85
768.52	73.69	0.83
768.33	73.21	0.79
768.15	56.66	0.83
767.97	40.55	0.81
767.85	64.14	0.89
767.67	65.65	0.83
767.48	62.19	0.84
767.20	32.66	0.86
766.92	35.17	1.03
766.74	27.37	0.87
766.55	39.30	1.01
766.37	65.27	0.92
766.18	36.92	1.00
766.00	30.33	0.90
765.81	61.58	0.91
765.62	32.66	1.05
765.25	20.11	1.03
765.07	42.30	1.00
764.88	30.70	0.81
764.60	62.11	1.02
764.42	105.47	0.95
764.23	70.55	0.92
763.95	9.24	1.11
763.77	22.90	0.72
763.58	50.18	0.59
763.30	28.60	0.74
763.12	29.77	0.56
762.93	10.55	0.80
762.65	59.99	0.85
762.47	74.40	0.70
762.28	113.15	0.72
762.00	53.69	1.00
761.86	55.50	0.99
761.82	18.64	0.73
761.65	74.71	1.07
761.64	46.04	0.94
761.46	34.88	0.97
761.43	66.49	1.03
761.22	33.33	1.02
761.01	47.15	1.00
760.80	48.62	0.94
760.58	33.74	0.93
760.37	18.89	0.78
760.15	26.13	0.77
759.93	26.13	0.74
759.72	26.13	0.73
759.50	26.13	0.71
759.29	26.13	0.75
759.07	60.37	0.71
758.85	78.72	0.86
758.64	63.76	0.86
758.42	84.31	0.75
758.20	114.43	0.82
757.99	78.91	0.78
757.77	34.01	0.72
757.56	41.04	0.75
757.34	64.34	0.80
757.11	26.13	0.76
756.88	30.83	0.74
756.64	19.81	0.70
756.39	18.96	0.85
756.13	32.83
755.87	34.01
755.60	16.43
755.32	75.42
755.00	70.10