Publication Date:
2024-01-09
Description:
Several high-resolution proxy environmental records have been obtained for the last 35 kyr from ODP Hole 658C, a well-studied site ca. 200 km off Cap Blanc, NW Africa. The collective assessment based on the marine proxies (UK'37 SST, contents of TOC and chlorins, Upwelling Radiolarian Index and the percentage of Florisphaera profunda), surprisingly indicates that the last glacial maximum (LGM) was characterized by warmer sea surface temperature (SST), weaker upwelling, and lower marine productivity, compared with the preceding older glacial and subsequent deglaciation periods. Of the terrigenous proxies, the mean grain size of the non-carbonate fraction and the terrigenous alkane content indicate that wind strength and aridity were high. The weaker upwelling at the 658 site during the LGM may have resulted from changes in the strength and direction of the wind systems and/or shifts in the position and geometry of the upwelling cell.
Keywords:
108-658C; AGE; Age, maximum/old; Age, minimum/young; Calculated from UK'37 (Prahl et al., 1988); Canarias Sea; Carbon, organic, total; Carbon, organic, total, maximum; Carbon, organic, total, minimum; Chlorins; DRILL; Drilling/drill rig; Epoch; Florisphaera profunda; Grain size, mean; Joides Resolution; Leg108; n-Alkane, total per unit sediment mass; n-Alkane C29, δ13C; Ocean Drilling Program; ODP; Sea surface temperature, annual mean; Terrigenous; Upwelling radiolarian index
Type:
Dataset
Format:
text/tab-separated-values, 150 data points
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