Example environmental time series data
env.RdA data frame containing synthetic environmental data over a full year (365 days) with seasonal patterns and random variation. This dataset demonstrates the expected format for environmental forcing data used in the macroalgae growth model.
Format
A data frame with 365 rows and 8 columns:
- t
Time step (day of year)
- temperature
Water temperature (°C)
- light
Surface light availability (μmol photons m-2 s-1)
- kW
Light attenuation coefficient in water (m-1)
- velocity
Mean water velocity (m s-1)
- salinity
Salinity (g L-1)
- nitrate
Nitrate concentration (mg m-3)
- ammonium
Ammonium concentration (mg m-3)
Details
The environmental data includes:
Seasonal temperature variation (15°C ± 3.5°C with random noise)
Light availability with seasonal patterns
Seasonal variation in light attenuation coefficient
Seasonal variation in water velocity
Salinity variation around 35 g/L
Nitrogen concentrations (nitrate and ammonium) with seasonal patterns
All variables include random variation to simulate natural environmental conditions.
See also
grow_macroalgae() for using this data in growth simulations.
Examples
# View structure of environmental data
str(env)
#> 'data.frame': 365 obs. of 8 variables:
#> $ t : int 1 2 3 4 5 6 7 8 9 10 ...
#> $ temperature: num 13.3 15.9 13.4 12.2 14 ...
#> $ light : num 583 658 707 248 620 ...
#> $ kW : num 0.036 0.0478 0.0409 0.0317 0.036 ...
#> $ velocity : num 0.232 0.134 0.143 0.199 0.162 ...
#> $ salinity : num 35.1 34.7 34.6 34.9 35 ...
#> $ nitrate : num 92.2 76.2 73.8 81 72.9 ...
#> $ ammonium : num 20.5 21.5 20.1 21.5 23.1 ...
# Plot temperature over time
plot(env$t, env$temperature, type = "l",
xlab = "Day of year", ylab = "Temperature (°C)")
# Summary of all environmental variables
summary(env)
#> t temperature light kW
#> Min. : 1 Min. : 7.188 Min. : -8.625 Min. :-0.065582
#> 1st Qu.: 92 1st Qu.:12.806 1st Qu.: 545.483 1st Qu.:-0.022589
#> Median :183 Median :14.998 Median : 726.604 Median : 0.009665
#> Mean :183 Mean :14.985 Mean : 734.519 Mean : 0.010092
#> 3rd Qu.:274 3rd Qu.:17.283 3rd Qu.: 927.477 3rd Qu.: 0.044070
#> Max. :365 Max. :22.425 Max. :1437.278 Max. : 0.080005
#> velocity salinity nitrate ammonium
#> Min. :0.004778 Min. :32.65 Min. : 18.41 Min. : 5.71
#> 1st Qu.:0.187499 1st Qu.:34.46 1st Qu.: 47.59 1st Qu.:11.82
#> Median :0.249024 Median :35.07 Median : 71.19 Median :15.06
#> Mean :0.249137 Mean :35.05 Mean : 70.04 Mean :14.95
#> 3rd Qu.:0.315802 3rd Qu.:35.70 3rd Qu.: 91.84 3rd Qu.:18.09
#> Max. :0.484129 Max. :37.11 Max. :133.27 Max. :24.36