Citation:

j.quascirev.2011.10.007

Name: (Table 1) Age determination of ODP Site 155-942
Published: 2011
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Glacioeustatic- and temperature-corrected planktonic foraminiferal oxygen isotope (dd18O) records from ODP Site 942 on the Amazon Fan provide a means of monitoring past changes in the outflow of the Amazon River. This study focuses on the last deglaciation and reveals that during this period there were significant variations in the outflow, which implies large changes in moisture availability in the Amazon Basin. Aridity in the Amazon Basin seems to occur between 20.5 ka (calendar) to 17.0 ka and 13.6 ka to 11 ka. The second arid period correlates with the start of the Antarctic Cold Reversal and aridity continues throughout the Younger Dryas period. We find that the large-scale trends in Amazon River outflow are dissimilar to high-latitude variability in either hemisphere. Instead high-resolution variations correlate with the d18O difference between Greenland and Antarctica ice core temperature records. This suggests a link between Hemispheric temperature gradients and moisture availability over the Amazon. Based on our results and previously published work we present a new testable 'dynamic boundary-monsoon intensity hypothesis', which suggests that tropical moisture is not a simple belt that moves north or south. Rather, the northern and southern boundaries of the South American Summer Monsoon (SASM) are independently dynamic and driven by temperature gradients within their individual hemispheres. The intensity of rainfall within the SASM, however, is driven by precessionally modulated insolation and the resultant convection strength. Combining these two influences produces the dynamic heterogenic changes in the moisture availability observed over tropical South America since the Last Glacial Maximum.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 5.742500 * Longitude: -49.090933

Date/Time Start: 1994-05-09T00:00:00 * Date/Time End: 1994-05-11T00:00:00

Minimum DEPTH, sediment/rock: 0.78 m * Maximum DEPTH, sediment/rock: 7.61 m

Event(s):

155-942 * Latitude: 5.742500 * Longitude: -49.090933 * Date/Time Start: 1994-05-09T00:00:00 * Date/Time End: 1994-05-11T00:00:00 * Elevation: -3354.3 m * Penetration: 323.1 m * Recovery: 253.5 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 33 cores; 293.9 m cored; 0 m drilled; 86.3% recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample ID	Sample ID		Maslin, Mark
2	Sample code/label	Sample label		Maslin, Mark	DSDP/ODP/IODP sample designation
3	DEPTH, sediment/rock	Depth sed	m			Geocode – mbsf
4	Age, dated material	Dated material		Maslin, Mark
5	Age, dated	Age dated	ka	Maslin, Mark	Age, 14C AMS	uncorrected
6	Age, minimum/young	Age min	ka	Maslin, Mark	Age, 14C AMS	uncorrected
7	Age, dated, range, minimum	Age dated min	ka	Maslin, Mark	Age, 14C AMS	uncorrected
8	Calendar age	Cal age	ka BP	Maslin, Mark	Age, 14C calibrated	GISP2
9	Calendar age, standard deviation	Cal age std dev	±	Maslin, Mark	Age, 14C calibrated	GISP2

License:

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

Size:

266 data points

Data

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

1 Sample ID	2 Sample label	3 Depth sed [m]	4 Dated material	5 Age dated [ka]	6 Age min [ka]	7 Age dated min [ka]	8 Cal age [ka BP]	9 Cal age std dev [±]
KIA 473	155-942C-1H-1W,80-81	0.80	Globigerinoides sacculifer	9.751	0.095	0.095	10.199	0.27
LL CAMS 122186	155-942B-1H-1W,78-79	0.78	Mixed	9.825	0.035	0.035	10.330	0.27
KIA 474	155-942C-1H-1W,88-90	0.88	Mixed	10.154	0.090	0.090	10.903	0.28
LL CAMS 90540	155-942B-1H-1W,82-83	0.82	Mixed	10.265	0.035	0.035	10.910	0.28
LL CAMS 90541	155-942B-1H-1W,89-90	0.89	Mixed	10.205	0.030	0.030	10.962	0.28
KIA 5198	155-942C-1H-1W,97-98	0.98	Pulleniatina obiquilata	9.670	0.060	0.060	10.977	0.28
KIA 5197	155-942C-1H-1W,105-107	1.06	Globigerinoides trilobus + G. ruber	10.010	0.060	0.060	11.036	0.28
KIA 2471	155-942C-1H-1W,125-129	1.27	Mixed	10.800	0.070	0.070	11.192	0.29
KIA 2470	155-942C-1H-1W,125-129	1.27	Mixed	10.890	0.050	0.050
KIA 5195	155-942C-1H-1W,147-150	1.48	Mixed	4.690	0.040	0.040	11.348	0.29
KIA 2472	155-942C-1H-2W,30-32	1.81	Mixed	10.510	0.050	0.050	11.592	0.29
KIA 5193	155-942C-1H-2W,54-58	2.06	Mixed	10.690	0.060	0.060	11.778	0.30
KIA 2473	155-942C-1H-2W,90-92	2.41	Mixed	11.650	0.060	0.060	12.037	0.30
KIA 5191	155-942C-1H-2W,143-146	2.94	Mixed	10.620	0.060	0.060	12.430	0.31
SUERC 8783	155-942B-1H-3W,33-38	3.35	Mixed	9.151	0.030	0.030	12.741	0.31
KIA 5189	155-942C-1H-3W,54-57	3.55	Mixed	11.790	0.070	0.070	12.882	0.31
LL CAMS 90542	155-942B-1H-3W,98-100	3.98	Mixed	12.180	0.035	0.035	13.457	0.32
LL CAMS 89321	155-942B-1H-4W,38-40	4.89	Mixed	12.430	0.025	0.025	13.642	0.33
LL CAMS 89322	155-942B-1H-4W,78-80	5.29	Mixed	12.925	0.030	0.030	14.895	0.35
SUERC 8784	155-942B-1H-4W,103-105	5.54	Mixed	13.716	0.045	0.045	16.523	0.38
LL CAMS 89323	155-942B-1H-4W,108-110	5.59	Mixed	13.875	0.030	0.030	16.855	0.38
SUERC 8785	155-942B-1H-4W,133-135	5.84	Mixed	14.419	0.055	0.055	17.064	0.39
SUERC 8697	155-942B-1H-4W,138-140	5.89	Mixed	14.478	0.060	0.060	17.073	0.39
SUERC 8698	155-942B-1H-5W,8-10	6.09	Mixed	14.733	0.065	0.065	17.531	0.39
LL CAMS 89324	155-942B-1H-5W,23-25	6.24	Mixed	15.190	0.035	0.035	17.674	0.40
SUERC 8787	155-942B-1H-5W,38-40	6.39	Globigerinoides sacculifer	15.871	0.060	0.060	18.011	0.65
LL CAMS 89,325	155-942B-1H-5W,58-60	6.59	Mixed	16.485	0.035	0.035	18.956	0.42
SUERC 8788	155-942B-1H-5W,83-85	6.84	Mixed	17.108	0.070	0.070	19.671	0.43
LL CAMS 90543	155-942B-1H-5W,108-110	7.09	Mixed	17.840	0.060	0.060	20.245	0.46
LL CAMS 90538	155-942B-1H-5W,113-115	7.14	Mixed	17.970	0.060	0.060	20.365	0.55
LL CAMS 89326	155-942B-1H-5W,113-115	7.14	Mixed	18.085	0.050	0.050
LL CAMS 90544	155-942B-1H-5W,120-122	7.21	Mixed	18.260	0.060	0.060	20.724	0.45
LL CAMS 90539	155-942B-2H-1W,10-12	7.61	Mixed	17.485	0.050	0.050	21.974	0.61
LL CAMS 89327	155-942B-2H-1W,10-12	7.61	Mixed	17.535	0.035	0.035