21.Michida, Y. and H. Yoritaka
  Survivability of the drifters deployed by Hydrographic Department for the period from 1988 to 1993
  J. of the Japan Society for Marine Surveys and Technology, 7(2),21-28,1995.


The survivability of surface drifters deployed by Hydrographic Department for
the period from 1988 to 1993 is estimated for two aspevts of transmission
life and drogue life, and is compared with the drifters deployed within WOCE
SVP by other organizations such as the Global Drifter Center operated by
Scripps Institution of Oceanography and AOML of NOAA. In comparison of
half life which is determined as the time when 50% drifters survive after
deployment, it is concluded that our drifters have provided as robust data
set as others from the view point of transmission life and not enough robust
in terms of drogue life. The transmission life of our drifters has been getting
longer steadily since 1988 and reached close to 300 days in 1993.
Two reasons that regulate the drifter life; accidental troubles happening on
drifters and the life of battery, and their effects on the characteristics of
survivability are also discussed. It is suggested to be possible to describe
the survivability of surface drifters by using a simplified model where only
two components memtioned above are taken into account.




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