Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64...44t&link_type=abstract
Earth and Planetary Science Letters, Volume 64, Issue 1, p. 44-55.
Physics
16
Scientific paper
A mooring array with three automated sediment traps capable of collecting time series samples was deployed in the Panama Basin for one year beginning in December 1979. A series of six consecutive two-month long samples was collected at each of three depths (890, 2590 and 3560 m) in order to examine seasonal variation in the flux of planktonic foraminifera, and evaluate the contribution of foraminifera to the total carbonate flux.
The flux of the larger planktonic foraminifera (250-500 μm and 500-1000 μm) is greatest during February-March when upwelling is most intense in the Panama Basin. In contrast, the maximum flux of the smaller foraminifera (125-250 μm) is associated with a phytoplankton bloom during the summer months (June through September). This size-dependent flux pattern appears to be a species specific effect. The flux of the larger foraminifera is dominated by non-spinose forms (i.e. Neogloboquadrina dutertrei and Globorotalia theyeri), while the flux of the smaller foraminifera consists predominantly of spinose species (i.e. Globigerinoides ruber, G. sacculifer and G. conglobatus). Although the magnitude of the flux varied throughout the year, the average weight of individual foraminiferal tests in different size fractions showed no seasonal variability.
With the exception of the June-July period when there was a major coccolith bloom, planktonic foraminifera greater than 125 μm account for between 28 and 34% of the total carbonate flux at this location. During the coccolith bloom, planktonic foraminifera accounted for less than 2% of the total carbonate flux. Planktonic foraminifera in the 250-500 μm size range are the most significant contributors to the overall particulate flux, accounting for roughly 70-80% of the total foraminiferal fluxes measured at the three trap depths.
Curry William B.
Honjo Susumu
Thunell Robert C.
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