11.2.1Physical oceanography
DISTRIBUTION AND MASS
• To reduce the magnitude of uncertainties of the
vertical distribution data, and its relation with
environmental conditions, more multi-level trawl
measurements need to be taken inside subtropical
gyres (see Figure 11.1). Preferably this should be done
in the North Pacific Gyre, as this is likely to be the
primary target of this project.
• A large measurement-based dataset of plastic
concentrations of different sizes—both micro and
macro plastics—needs to be built in order to
confirm the assumption others have made by
extrapolating plastic concentration measurements
over entire gyres. To avoid distortion caused by spatial
variations in time, multiple parallel and simultaneous
gyre transections could be measured (see Figure 11.2).
Such a large-scale experiment could also study the
assumption that the ratio between micro and macro
The research undertaken has provided the basis
not only for drawing conclusions of the concept’s
feasibility and financial viability, but also
for recommending necessary future research
before the project is executed in full scale. To
summarize, the two essential elements of future
in the second phase of the project are:
• The in-depth engineering and optimization
of the structure; and
• Improving the plastic mass estimate, by
taking spatial and temporal variability, as
well as measured vertical distribution into
account.
These and several other (secondary) recommendations
for future work have been outlined
in this chapter, separated into appropriate research
fields.
Figure 11.1 Measuring vertical distribution using a multi-level trawl
Figure 11.2 Simultaneous transections of an area could avoid inaccuracies
caused by spatial and temporal variability
11.2 CHAPTER 11.2
debris is constant across the gyre. If so, by sampling a
large volume of surface water using a large sampling
device, a mass spectrum could then by obtained which
can then be extrapolated to the gyre, creating a much
more accurate mass estimate. To enhance the dataset
for especially rare debris, collaboration could be
sought with parties that use remote sensing to localize
debris is constant across the gyre. If so, by sampling a
large volume of surface water using a large sampling
device, a mass spectrum could then by obtained which
can then be extrapolated to the gyre, creating a much
more accurate mass estimate. To enhance the dataset
for especially rare debris, collaboration could be
sought with parties that use remote sensing to localize
very large debris.
11.2.1Physical oceanographyDISTRIBUTION AND MASS• To reduce the magnitude of uncertainties of thevertical distribution data, and its relation withenvironmental conditions, more multi-level trawlmeasurements need to be taken inside subtropicalgyres (see Figure 11.1). Preferably this should be donein the North Pacific Gyre, as this is likely to be theprimary target of this project.• A large measurement-based dataset of plasticconcentrations of different sizes—both micro andmacro plastics—needs to be built in order toconfirm the assumption others have made byextrapolating plastic concentration measurementsover entire gyres. To avoid distortion caused by spatialvariations in time, multiple parallel and simultaneousgyre transections could be measured (see Figure 11.2).Such a large-scale experiment could also study theassumption that the ratio between micro and macroThe research undertaken has provided the basisnot only for drawing conclusions of the concept’sfeasibility and financial viability, but alsofor recommending necessary future researchbefore the project is executed in full scale. Tosummarize, the two essential elements of futurein the second phase of the project are:• The in-depth engineering and optimizationof the structure; and• Improving the plastic mass estimate, bytaking spatial and temporal variability, aswell as measured vertical distribution intoaccount.These and several other (secondary) recommendationsfor future work have been outlinedin this chapter, separated into appropriate researchfields.Figure 11.1 Measuring vertical distribution using a multi-level trawlFigure 11.2 Simultaneous transections of an area could avoid inaccuraciescaused by spatial and temporal variability11.2 CHAPTER 11.2debris is constant across the gyre. If so, by sampling alarge volume of surface water using a large samplingdevice, a mass spectrum could then by obtained whichcan then be extrapolated to the gyre, creating a muchmore accurate mass estimate. To enhance the datasetfor especially rare debris, collaboration could besought with parties that use remote sensing to localizedebris is constant across the gyre. If so, by sampling alarge volume of surface water using a large samplingdevice, a mass spectrum could then by obtained whichcan then be extrapolated to the gyre, creating a muchmore accurate mass estimate. To enhance the datasetfor especially rare debris, collaboration could besought with parties that use remote sensing to localizevery large debris.
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