The amazing result is shown in Figure 3d of their article entitled “Tracking Ocean Debris” in IPRC Climate, Volume 8, Number 2, 2008. The article may be found by Googling “IPRC Ocean Debris,” which takes you to the following address: http://iprc.soest.hawaii.edu/publications/newsletters/newsletter_sections/iprc_climate_vol8_2/tracking_ocean_debris.pdf
What’s needed is for mariners to sail through these patches and report what they see. Particularly the three patches in the Southern Hemisphere for which observations are scarce. If you plan on visiting a garbage patch, please let me know so we can discuss details.