Herguera, Juan-Carlos; Berger, Wolfgang H (1991): Benthic foraminifera and accumulation rates in different time slices of sediment cores from the Equatorial Pacific [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.57426, Supplement to: Herguera, J-C; Berger, WH (1991): Paleoproductivity from benthic foraminifera abundance: glacial to postglacial change in the west-equatorial Pacific. Geology, 19(12), 1173-1176, https://doi.org/10.1130/0091-7613(1991)019%3C1173:PFBFAG%3E2.3.CO;2
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Abstract:
Surface productivity is correlated with the rate of accumulation of benthic foraminifera on the deep-sea floor. As a rule of thumb, for each 1 mg of organic carbon arriving at the sea floor, one benthic foram shell >150 µm is deposited. The correlation can be used to reconstruct organic flux to the sea floor in the past, and hence the productivity of past oceans. Applying the appropriate equations to box core data from the Ontong Java Plateau in the western equatorial Pacific, we found that productivity during the last glacial maximum exceeded present productivity by a factor of between 1.5 and 2.0, with intermediate values for the mid-transition period. Accumulation of benthic foraminifera was depressed on top of the plateau during the glacial and transitional period, presumably because increased winnowing removed part of the food supply.
Related to:
Berger, Wolfgang H; Fisher, K; Lai, C; Wu, Guoping (1987): Ocean carbon flux: global maps of primary production and export production. In: Biogeochemical Cycling and Fluxes between the Deep Euphotic Zone and other Oceanic Realms, ed. Agegian C, NOAA Symp. Ser. for Under sea Research, NOAA Undersea Research Program, 3(2). Preprint in SIO ref, 30-87
Berger, Wolfgang H; Killingley, John S (1982): Box cores from the equatorial Pacific: 14C sedimentation rates and benthic mixing. Marine Geology, 45(1-2), 93-125, https://doi.org/10.1016/0025-3227(82)90182-7
Coverage:
Median Latitude: -0.419906 * Median Longitude: -158.215781 * South-bound Latitude: -17.638000 * West-bound Longitude: 155.868000 * North-bound Latitude: 4.850000 * East-bound Longitude: -14.960000
Date/Time Start: 1975-04-10T00:00:00 * Date/Time End: 1978-10-20T00:00:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
ERDC-077BX * Latitude: 4.850000 * Longitude: 156.058000 * Date/Time: 1975-04-10T00:00:00 * Elevation: -3585.0 m * Campaign: ERDC * Basis: Thomas Washington * Method/Device: Box corer (BC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Foraminifera, benthic | Foram benth | #/g | Herguera, Juan-Carlos | Counting >150 µm fraction | core top |
| 7 | Foraminifera, benthic | Foram benth | #/g | Herguera, Juan-Carlos | Counting >150 µm fraction | transition period |
| 8 | Foraminifera, benthic | Foram benth | #/g | Herguera, Juan-Carlos | Counting >150 µm fraction | last glacial maximum |
| 9 | Ratio | Ratio | Herguera, Juan-Carlos | ratio foram transition zone/foram core top | ||
| 10 | Ratio | Ratio | Herguera, Juan-Carlos | ratio foram last glacial maximum/foram core top | ||
| 11 | Sedimentation rate | SR | cm/ka | Herguera, Juan-Carlos | Calculated | based on mid-transition of oxygen isotope record in planktonic foraminifera, set to 11000 years BP (T-scale) |
| 12 | Accumulation rate, mass | MAR | g/cm2/ka | Herguera, Juan-Carlos | Calculated | dry density values of Berger and Killingley (1982) |
| 13 | Accumulation rate, number of benthic foraminifera | BFAR | #/cm2/ka | Herguera, Juan-Carlos | Calculated | |
| 14 | - | - | Herguera, Juan-Carlos | Calculated | BFAR*Z-index = BFAR * waterdepth in km | |
| 15 | Primary production of carbon | PP C | g/cm2/ka | Herguera, Juan-Carlos | assigned to each sample, based on location, and the synthetic map of Berger et al, 1987 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
260 data points