watts.in: Simple estimate of energy gained by a layer of water

In LakeMetabolizer: Tools for the Analysis of Ecosystem Metabolism

Simple estimate of energy gained by a layer of water

Description

Estimate the amount of energy gained by a layer of water as the difference between energy entering from the top of the layer and energy leaving at the bottom. Energy gained/ lost is calculated from photosynthetically active radiation (PAR, which is then converted to watts) and an estimate of kd (light attenuation coefficient) which is derived from the depth of 1 percent surface light.

Usage

watts.in(top, bot, irr, z1perc)

Arguments

top	Depth of the top of the layer, in meters
bot	Depth of the bottom of the layer, in meters
irr	PAR in uE/s (umol / m^2 / s)
z1perc	Depth of 1 percent of surface light, in meters

Details

This rough estimate is used in the Kalman filter/ smoother for water temperature. It does not account for a variety of potentially important factors, and is made specifically for use with temp.kalman(), which uses maximum likelihood to fit a linear coefficient that converts this heat gain estimate into temperature change.

Value

numeric vector of estimates of energy gain

Author(s)

Ryan Batt, Luke Winslow

References

Batt, Ryan D. and Stephen R. Carpenter. 2012. Free-water lake metabolism: addressing noisy time series with a Kalman filter. Limnology and Oceanography: Methods 10: 20-30. doi: 10.4319/lom.2012.10.20

See Also

temp.kalman metab.kalman

Examples

watts.in(3.2, 4, 1200, 4.5)

LakeMetabolizer documentation built on Nov. 16, 2022, 1:09 a.m.