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 15 16.2 15.5 15 16.6 ...
#> $ light : num 645 655 797 595 778 ...
#> $ kW : num 0.0769 0.0742 0.0732 0.0726 0.0765 ...
#> $ velocity : num 0.175 0.181 0.216 0.164 0.159 ...
#> $ salinity : num 34.6 35 34.5 35.4 34.7 ...
#> $ nitrate : num 79.7 64.2 48.3 72.3 58.6 ...
#> $ ammonium : num 20.8 19.2 16.6 18.4 19.2 ...
# 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. : 9.599 Min. : 253.0 Min. :0.02028
#> 1st Qu.: 92 1st Qu.:13.895 1st Qu.: 587.9 1st Qu.:0.03764
#> Median :183 Median :16.239 Median : 758.4 Median :0.05452
#> Mean :183 Mean :16.437 Mean : 761.2 Mean :0.05452
#> 3rd Qu.:274 3rd Qu.:18.963 3rd Qu.: 927.6 3rd Qu.:0.07224
#> Max. :365 Max. :23.974 Max. :1316.1 Max. :0.08800
#> velocity salinity nitrate ammonium
#> Min. :0.0223 Min. :32.95 Min. : 5.029 Min. : 6.153
#> 1st Qu.:0.1869 1st Qu.:34.39 1st Qu.: 42.015 1st Qu.:11.687
#> Median :0.2478 Median :34.94 Median : 60.661 Median :14.830
#> Mean :0.2501 Mean :35.00 Mean : 59.925 Mean :14.975
#> 3rd Qu.:0.3108 3rd Qu.:35.62 3rd Qu.: 77.286 3rd Qu.:18.411
#> Max. :0.4758 Max. :37.35 Max. :105.403 Max. :25.011