Citation:

PANGAEA.962001

Name: Reconstructed upper ocean temperature (UK'37 and TEXH86) of sediment core GL-1180, western tropical Atlantic
Published: 2023-11-03
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Deglaciations; TEXH86; UK'37

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Published: 2023-11-03 • DOI registered: 2023-12-02

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Abstract:

During glacial terminations, the role of cross-equatorial currents in the northward spreading of warm and salty waters is essential to the reach of the following interglacial state. In the western tropical Atlantic, where the interhemispheric North Brazil current develops, most of the existing temperature records focused on the last deglaciation. Here, using a marine sediment core covering the last 305 kyr before present (BP), we present two records of the surface (mixed layer) and the subsurface (upper thermocline) temperatures based on organic proxies UK'37 and TEXH86 respectively. During the last three glacial terminations, these records exhibit large temperature increases especially in the subsurface layer. We suggest the combined influence of the thermal bipolar seesaw and the Agulhas Leakage, acting together to warm the interior South Atlantic, to explain the strong warming of the tropical western Atlantic thermocline (+ 5°C) during these periods of reduced AMOC. In addition, we propose an enhanced cross-equatorial gyre to elucidate the synchronous deglacial warming of the western and eastern sides of the tropical Atlantic. The resumption of the AMOC at the onset of the following interglacial leads to the release of heat stored in thermocline waters mainly in the whole South Atlantic, as highlighted by the sharp upper ocean cooling recorded at the end of the deglacial interval. The combination of this temperature record and previously published ones in the western tropical Atlantic confirms the strong sensitivity of the upper ocean to AMOC changes in this region.

Keyword(s):

Deglaciations; TEXH86; UK'37

Supplement to:

Rouyer-Denimal, Louis; Govin, Aline; Bouloubassi, Ioanna; Nguyen Tu, Thanh Thuy; Albuquerque, Ana Luiza Spadano; Anquetil, Christelle; Huguet, Arnaud (2023): Subsurface warming in the tropical Atlantic for the last 3 deglaciations: Insights from organic molecular proxies. Quaternary Science Reviews, 321, 108370, https://doi.org/10.1016/j.quascirev.2023.108370

Coverage:

Latitude: -8.450000 * Longitude: -33.550000

Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 17.30 m

Event(s):

GL1180 (GL-1180) * Latitude: -8.450000 * Longitude: -33.550000 * Elevation: -1037.0 m * Location: western tropical Atlantic * Method/Device: Core (CORE)

Comment:

In addition the analyses of the molecules used in these indices are :

* UK'37: Gas chromatography coupled with flame ionisation detector, Agilent, HP 6890 Series.

* TEX86: Liquid chromatography coupled with mass spectrometry, Shimadzu, LCMS 2020.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Rouyer-Denimal, Louis		Geocode
2	AGE	Age	ka BP	Rouyer-Denimal, Louis		Geocode
3	Alkenone, unsaturation index UK'37	UK'37		Rouyer-Denimal, Louis	Calculated from C37 alkenones
4	Tetraether index of 86 carbon atoms	TEX86		Rouyer-Denimal, Louis	Calculated from isoprenoid GDGTs

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

256 data points

Data

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

1 Depth sed [m]	2 Age [ka BP]	3 UK'37	4 TEX86
0.00	0.7080		0.641
0.05	0.9890		0.650
0.15	1.5830		0.661
0.25	2.7200		0.660
0.35	4.0900		0.661
0.45	5.5200		0.675
0.55	6.6450	0.984	0.636
0.65	8.3650	0.981	0.672
0.75	9.7950		0.686
0.85	10.8750		0.694
0.95	11.6000		0.691
1.05	12.3200		0.687
1.15	13.7750	0.956	0.638
1.25	15.9600	0.967	0.678
1.35	18.1500		0.683
1.45	20.7150	0.947	0.619
1.50	22.1800		0.610
1.85	30.0100	0.921	0.601
2.20	33.5200	0.938	0.641
2.55	38.3400	0.939	0.644
2.90	44.2550	0.904	0.615
3.25	50.3000	0.944	0.617
3.50	54.5800	0.917	0.606
3.85	60.8620	0.961	0.640
4.20	66.8100	0.935	0.660
4.30	68.5000	0.950	0.639
4.40	70.1900	0.958	0.645
4.50	71.5000	0.984	0.627
4.60	72.8000	0.969	0.662
4.70	74.1000	0.923	0.698
4.80	75.3100	0.970	0.660
4.90	76.5000	0.987	0.646
5.00	77.6900	0.966	0.651
5.10	78.8250	0.983	0.660
5.20	79.9500	0.973	0.663
5.30	81.0650	0.954	0.655
5.40	82.1150	0.982	0.670
5.50	83.1550	0.980	0.672
5.60	84.2000		0.694
5.70	85.2750	0.961	0.667
5.80	86.3400	0.956	0.648
5.90	87.4200	0.956	0.657
6.00	88.5500	0.948	0.666
6.10	89.6900	0.958	0.657
6.20	90.8300	0.977	0.648
6.30	91.9950	0.963	0.667
6.40	93.1630	0.954	0.667
6.50	94.3580	0.977	0.658
6.60	95.6500		0.660
6.70	96.9750	0.981	0.657
6.80	98.3000	0.976	0.671
6.90	99.6000	0.973	0.677
7.00	100.9100	0.979	0.673
7.10	102.2100	0.984	0.670
7.20	103.5100	0.978	0.666
7.25	104.1600	0.968	0.665
7.35	105.4600	0.968	0.664
7.45	106.8100	0.971	0.704
7.55	108.2100	0.957	0.645
7.65	109.6100	0.978	0.649
7.75	111.0750	0.961	0.654
7.85	112.6020	0.965	0.662
7.95	114.1270	0.977	0.676
8.05	115.7270	0.971	0.677
8.15	117.3920	0.976	0.663
8.25	119.0600	0.985	0.676
8.35	120.8500	0.992	0.687
8.45	122.7600	0.992	0.693
8.55	124.6700	0.992	0.719
8.65	126.5450	0.988	0.715
8.75	128.3850	0.992	0.718
8.85	130.2200	0.989	0.723
8.95	132.0550	0.984	0.716
9.05	133.8800	0.945	0.639
9.27	138.2450	0.973	0.618
9.54	144.4000	0.955	0.649
9.81	149.9150	0.960	0.664
10.08	155.6100	0.952	0.676
10.35	161.2700	0.943	0.629
10.62	166.9320	0.956	0.661
10.89	173.0120	0.950	0.628
11.16	179.2000	0.956	0.659
11.43	185.3700	0.966	0.650
11.50	186.9800	0.984	0.654
11.60	189.2800	0.969	0.634
11.70	190.9325	0.976	0.681
11.80	192.5950	0.977	0.676
11.90	194.2250	0.972	0.666
12.00	195.6300	0.974	0.655
12.10	197.0050	0.967	0.653
12.20	198.3800	0.984	0.672
12.30	199.7150	0.984	0.680
12.40	201.0500	0.986	0.702
12.50	202.3700	0.981	0.706
12.60	203.5950	0.985	0.709
12.70	204.8025	0.973	0.684
12.80	206.0100	0.977	0.709
12.90	207.2200	0.969	0.671
13.00	208.4200	0.971	0.670
13.10	209.6400	0.964	0.675
13.20	210.9300	0.997	0.665
13.30	212.2300	0.972	0.682
13.40	213.5400	0.976	0.662
13.50	214.8800	0.975	0.668
13.60	216.2300	0.965	0.676
13.70	217.5850	0.957	0.695
13.80	218.9200	0.965	0.701
13.90	220.2450	0.969	0.713
14.00	221.5800	0.964	0.674
14.10	223.1950	0.947	0.640
14.20	224.8100	0.953	0.668
14.30	226.4950	0.963	0.647
14.40	228.6700	0.959	0.657
14.50	230.9200	0.944	0.653
14.60	233.1600	0.955	0.667
14.70	235.3650	0.947	0.672
14.80	237.5700	0.946	0.680
14.90	239.7800	0.963	0.670
15.00	241.6400	0.980	0.673
15.10	243.5100	0.983	0.730
15.20	245.3800	0.992	0.734
15.30	247.4600	0.982	0.714
15.40	249.5500	0.950	0.663
15.51	251.6400	0.941	0.634
15.70	256.4900	0.931	0.648
15.90	262.1100	0.939	0.650
16.10	268.4800	0.951	0.692
16.30	274.8450	0.940	0.646
16.50	281.2150	0.953	0.645
16.70	287.6000	0.949	0.683
16.90	294.0350	0.942	0.652
17.00	297.2500	0.960	0.696
17.10	300.0250	0.945	0.657
17.20	302.8100	0.968	0.685
17.30	305.5250	0.957	0.668