Table 2 Comparison of dry and wet plastic deposition rates and their potential drivers.

Pearson correlation coefficients (r) between weekly wet and monthly dry deposition rates of plastic fibers and particles and indices of regional and broad-scale climate patterns. The temperature anomaly for the Western United States is used here as an index of jet stream location [data: National Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Information; www.ncdc.noaa.gov/cag/regional/time-series]. ENSO, El Niño–Southern Oscillation; F-stat, F statistic.

Deposition typeDust (r)Season (F-stat)ENSO (r)Temperature anomaly (r)
Dry deposition (total)−0.24**0.630.21**−0.25***
Dry fiber deposition−0.22**0.360.19*−0.23**
Dry particle deposition−0.24**5.64***0.29***−0.36***
Wet deposition (total)0.37***3.61**−0.13*−0.02
Wet fiber deposition0.21***2.91**−0.12*−0.03
Wet particle deposition0.36***1.71−0.08−0.04

*P < 0.1; **P < 0.05; ***P < 0.01.