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Table 7.

Residence timesa,b (days) of small (PS) and large (PL) POC

TracerNA, EZNA, UMZSP, EZSP, UMZ
PS 8.0 ± 1.8 10.7 ± 2.6 6.7 ± 1.7 10.4 ± 2.6 
PL 1.5 ± 0.2 1.7 ± 0.1 0.8 ± 0.6 1.8 ± 1.2 
TracerNA, EZNA, UMZSP, EZSP, UMZ
PS 8.0 ± 1.8 10.7 ± 2.6 6.7 ± 1.7 10.4 ± 2.6 
PL 1.5 ± 0.2 1.7 ± 0.1 0.8 ± 0.6 1.8 ± 1.2 

aCalculated by dividing the inventory of a given size fraction in the EZ or UMZ (Table 6) by the sum of fluxes in or out of that inventory (Table 5).

bResults in euphotic zone (EZ) and upper mesopelagic zone (UMZ) from NA and SP inversions. The NA inversion uses prior estimates for aggregation and disaggregation rate constants from the North Atlantic Bloom Experiment (Murnane et al., 1996). The SP inversion uses prior estimates for aggregation and disaggregation rate constants from Station P (Murnane, 1994).

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