Sediment Trap Recovery Cruise Update

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Date: Mon, 15 Jan 1996 17:51:48 +0000 (GMT)

An e-mail message from Dick Barber to Cindy Lee

In my opinion, the opera is not over until the last carousel has been recovered. So I guess it's over now. The sediment trap data sounds very interesting, particularly in the context of the productivities that didn't vary as much as we had expected. The intermonsoon seasons were surprisingly productive, but your observations look like there was a big (factor of 10?) variation in export. Looks interesting. Regards, Dick Barber

Response from Chief Scientist, Cindy Lee

Thanks, Dick. We're pretty happy about the results. The trap bulk fluxes appear to vary by a factor of about 30 between the monsoon and intermonsoonal periods and the flux peak occurs over a 50-100-day interval. If the productivity does not vary that much, then the story to watch must be in the removal processes. I can't wait to see the data in San Diego on seasonal changes in phytoplankton composition, grazing rates, and physical forcing. Dymond, Honjo, Wakeham, Hedges and I will all have copies of our preliminary flux data, and most of us will be at the meeting. Keep in mind, however, that these are initial estimates based on measuring the volume (not mass) of material in our collection cups. Collected material appeared quite different between monsoon and non-monsoonal times, so density may also be different. We were especially happy about the agreement between the WHOI/OSU and UW/SkIO/SUNY traps. When duplicate traps were deployed at similar or the same depths, the fluxes agreed extremely well, and when different trap types (cones vs. cylinders) were deployed near the same depths, they gave similar fluxes (within 30-50%). The flux patterns with time in the two different trap types were almost identical. Between the two trap types with their different collection abilities, it should be possible to provide samples for almost any sort of biological or chemical analysis. We landed in the Seychelles this morning and have just finished unloading the ship and cleaning up, so now it's time to go into town! Bye. cindy lee is