deMenocal, Peter B; Ortiz, Joseph D; Guilderson, Thomas P; Adkins, Jess F; Sarnthein, Michael; Baker, Linda; Yarusinsky, Martha (2000): Age determination of ODP Hole 108-658C (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.742958, Supplement to: deMenocal, PB et al. (2000): Abrupt onset and termination of the African Humid Period: rapid climate responses to gradual insolation forcing. Quaternary Science Reviews, 19(1-5), 347-361, https://doi.org/10.1016/S0277-3791(99)00081-5
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Published: 2000 (exact date unknown) • DOI registered: 2010-08-06
Abstract:
A detailed (ca. 100 yr resolution) and well-dated (18 AMS 14C dates to 23 cal. ka BP) record of latest Pleistocene–Holocene variations in terrigenous (eolian) sediment deposition at ODP Site 658C off Cap Blanc, Mauritania documents very abrupt, large-scale changes in subtropical North African climate. The terrigenous record exhibits a well-defined period of low influx between 14.8 and 5.5 cal. ka BP associated with the African Humid Period, when the Sahara was nearly completely vegetated and supported numerous perennial lakes; an arid interval corresponding to the Younger Dryas Chronozone punctuates this humid period. The African Humid Period has been attributed to a strengthening of the African monsoon due to gradual orbital increases in summer season insolation. However, the onset and termination of this humid period were very abrupt, occurring within decades to centuries. Both transitions occurred when summer season insolation crossed a nearly identical threshold value, which was 4.2% greater than present. These abrupt climate responses to gradual insolation forcing require strongly non-linear feedback processes, and current coupled climate model studies invoke vegetation and ocean temperature feedbacks as candidate mechanisms for the non-linear climate sensitivity. The African monsoon climate system is thus a low-latitude corollary to the bi-stable behavior of high-latitude deep ocean thermohaline circulation, which is similarly capable of rapid and large-amplitude climate transitions.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 20.749200 * Longitude: -18.580800
Date/Time Start: 1986-03-08T00:45:00 * Date/Time End: 1986-03-08T16:00:00
Minimum DEPTH, sediment/rock: 0.17 m * Maximum DEPTH, sediment/rock: 4.12 m
Event(s):
108-658C * Latitude: 20.749200 * Longitude: -18.580800 * Date/Time Start: 1986-03-08T00:45:00 * Date/Time End: 1986-03-08T16:00:00 * Elevation: -2273.0 m * Penetration: 72.9 m * Recovery: 70.38 m * Location: Canarias Sea * Campaign: Leg108 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 72.9 m cored; 0 m drilled; 96.5 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | deMenocal, Peter B | DSDP/ODP/IODP sample designation | ||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Age, dated | Age dated | ka | deMenocal, Peter B | Age, 14C AMS | |
| 4 | Age, dated, standard deviation | Age dated std dev | ± | deMenocal, Peter B | Age, 14C AMS | |
| 5 | Age, dated | Age dated | ka | deMenocal, Peter B | Age, 14C calibrated | radiocarbon ages after 500 years reservoir correction |
| 6 | Age, dated | Age dated | ka | deMenocal, Peter B | Age, 14C calibrated | calibrated age B.P. |
| 7 | Age, minimum/young | Age min | ka | deMenocal, Peter B | Age, 14C calibrated | 2 sigma calib. age range |
| 8 | Age, maximum/old | Age max | ka | deMenocal, Peter B | Age, 14C calibrated | 2 sigma calib. age range |
| 9 | Age, comment | Comm | deMenocal, Peter B |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
129 data points
Data
| 1 Sample label (DSDP/ODP/IODP sample designation) | 2 Depth sed [m] | 3 Age dated [ka] (Age, 14C AMS) | 4 Age dated std dev [±] (Age, 14C AMS) | 5 Age dated [ka] (radiocarbon ages after 500 ye...) | 6 Age dated [ka] (calibrated age B.P., Age, 14C...) | 7 Age min [ka] (2 sigma calib. age range, Age...) | 8 Age max [ka] (2 sigma calib. age range, Age...) | 9 Comm |
|---|---|---|---|---|---|---|---|---|
| 108-658C-1H-1,16-18 | 0.17 | 1.13 | 0.05 | 0.63 | 0.60 | 0.549 | 0.653 | Dates used to constrain the ¥nominal¥ age model |
| 108-658C-1H-1,28-30 | 0.29 | 1.39 | 0.04 | 0.89 | 0.78 | 0.732 | 0.899 | |
| 108-658C-1H-1,52-54 | 0.53 | 1.60 | 0.04 | 1.10 | 0.98 | 0.952 | 1.057 | |
| 108-658C-1H-1,64-66 | 0.65 | 2.55 | 0.04 | 2.05 | 1.99 | 1.944 | 2.040 | |
| 108-658C-1H-1,74-76 | 0.75 | 2.10 | 0.04 | 1.60 | 1.51 | 1.393 | 1.555 | |
| 108-658C-1H-1,88-90 | 0.89 | 4.29 | 0.04 | 3.79 | 4.15 | 4.088 | 4.230 | |
| 108-658C-1H-1,100-102 | 1.01 | 4.22 | 0.04 | 3.72 | 4.03 | 3.983 | 4.092 | |
| 108-658C-1H-1,122-124 | 1.23 | 5.08 | 0.04 | 4.58 | 5.30 | 5.098 | 5.313 | Dates used to constrain the ¥nominal¥ age model |
| 108-658C-1H-2,4-6 | 1.58 | 7.10 | 0.04 | 6.60 | 7.47 | 7.393 | 7.518 | |
| 108-658C-1H-2,32-34 | 1.86 | 7.59 | 0.04 | 7.09 | 7.85 | 7.826 | 7.918 | |
| 108-658C-1H-2,48-50 | 2.02 | 9.28 | 0.06 | 8.78 | 9.71 | 9.650 | 9.885 | |
| 108-658C-1H-2,76-78 | 2.30 | 10.52 | 0.04 | 10.02 | 11.21 | 11.047 | 11.646 | |
| 108-658C-1H-2,105-107 | 2.59 | 11.78 | 0.04 | 11.28 | 13.19 | 13.122 | 13.260 | |
| 108-658C-1H-2,124-126 | 2.78 | 11.78 | 0.04 | 11.28 | 13.19 | 13.122 | 13.260 | |
| 108-658C-1H-3,16-18 | 3.24 | 13.03 | 0.04 | 12.53 | 14.69 | 14.518 | 14.873 | Dates used to constrain the ¥nominal¥ age model |
| 108-658C-1H-3,20-22 | 3.28 | 14.86 | 0.06 | 14.36 | 17.21 | 17.103 | 17.320 | Dates used to constrain the ¥nominal¥ age model |
| 108-658C-1H-3,42-44 | 3.50 | 16.49 | 0.08 | 15.99 | 18.87 | 17.749 | 18.992 | |
| 108-658C-1H-3,104-106 | 4.12 | 19.96 | 0.08 | 19.46 | 22.91 | Dates used to constrain the ¥nominal¥ age model |