The late Quaternary history of primary productivity in the subarctic east Pacific ...
Palaeoceanographic work in the subarctic northeast Pacific has previously been limited by the common presence of turbidites and by the relatively shallow CCD. ODP Site 887 is on the Patton Murray Rise, an elevated plateau which is largely isolated from these effects. This area is centered under the...
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| Format: | Text |
| Language: | English |
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University of British Columbia
2009
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| Online Access: | https://dx.doi.org/10.14288/1.0053117 https://doi.library.ubc.ca/10.14288/1.0053117 |
| Summary: | Palaeoceanographic work in the subarctic northeast Pacific has previously been limited by the common presence of turbidites and by the relatively shallow CCD. ODP Site 887 is on the Patton Murray Rise, an elevated plateau which is largely isolated from these effects. This area is centered under the Alaska Gyre, a region characterized by the domal upwelling of nutrient-rich waters. Sections from Holes 887A and 887C were spliced into the 887B profile to obtain a continuous composite record. Although calcite is not continuously distributed throughout the drilled section, the benthic foram 6¹⁸O profile from this record closely reflects the global (SPECMAP) signal. Hence, based on 6¹⁸O data and on radiocarbon dates from site survey cores,* a detailed chronology spanning the past 750 ky was developed. The controls on productivity in this region remain unclear since nitrate is perennially present in excess and does not limit primary production. However, past increases in productivity and rapid settling of biogenic ... |
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