walsby_generate_regression_ETR_I {pam} | R Documentation |
Walsby Regression for ETR I
Description
Fits a modified Walsby (1997) regression model without the respiration term, using Romoth (2019) naming conventions.
Calculates ETR_{max}
without accounting for photoinhibition.
Usage
walsby_generate_regression_ETR_I(
data,
etr_max_start_value = walsby_default_start_value_etr_max,
alpha_start_value = walsby_default_start_value_alpha,
beta_start_value = walsby_default_start_value_alpha
)
Arguments
data |
A |
etr_max_start_value |
Numeric. Initial value for |
alpha_start_value |
Numeric. Initial value for |
beta_start_value |
Numeric. Initial value for |
Details
A detailed documentation can be found under https://github.com/biotoolbox/pam?tab=readme-ov-file#walsby_generate_regression_etr_i-and-walsby_generate_regression_etr_ii.
Value
A list containing:
-
etr_regression_data
: Predicted ETR values. -
sdiff
: Deviation between actual and predicted ETR. -
etr_max
: Maximum ETR (ETR_{max}
). -
alpha
: Initial slope (\alpha
). -
beta
: Photoinhibition factor (\beta
).
References
Walsby, A. E. (1997). Numerical integration of phytoplankton photosynthesis through time and depth in a water column. New Phytologist, 136(2), 189-209. Available at: doi:10.1046/j.1469-8137.1997.00736.x
Romoth, K., Nowak, P., Kempke, D., Dietrich, A., Porsche, C., & Schubert, H. (2019). Acclimation limits of Fucus evanescens along the salinity gradient of the southwestern Baltic Sea. Botanica Marina, 62(1), 1-12. Available at: doi:10.1515/bot-2018-0098
Examples
path <- file.path(system.file("extdata", package = "pam"), "20240925.csv")
data <- read_dual_pam_data(path)
result <- walsby_generate_regression_ETR_I(data)