flux_units

calculates the conversion coefficient for flux_calc

Toolbox to process raw data from closed loop flux chamber (or tent)
setups into ecosystem gas fluxes usable for analysis. It goes from a
data frame of gas concentration over time (which can contain several
measurements) and a meta data file indicating which measurement was done
when, to a data frame of ecosystem gas fluxes including quality diagnostics.
Organized with one function per step, maximizing user flexibility and backwards
compatibility. Different models to estimate the fluxes from the raw data are
available: exponential as described in
Zhao et al (2018) <doi:10.1016/j.agrformet.2018.08.022>, exponential as described in
Hutchinson and Mosier (1981) <doi:10.2136/sssaj1981.03615995004500020017x>,
quadratic, and linear. Other functions include quality assessment,
plotting for visual check, calculation of fluxes based on the setup
specific parameters (chamber size, plot area, ...), gross primary production
and transpiration rate calculation, and light response curves.

Joseph Gaudard

fluxible

Ecosystem Gas Fluxes Calculations for Closed Loop Chamber Setup

flux_units function

<dl><dt>flux_units</dt>
<dd>desired units for the calculated fluxes. Has to be of the
form amount/time/surface. Amount can be <code>mol</code>, <code>mmol</code>, <code>umol</code>, <code>nmol</code> or
<code>pmol</code>. Time can be <code>d</code> (day), <code>h</code> (hour), <code>mn</code> (minute) or <code>s</code> (seconds).
Surface can be <code>m2</code>, <code>dm2</code> or <code>cm2</code>.</dd>
<dt>conc_units</dt>
<dd>units of gas concentration <code>mmol/mol</code>, <code>ppm</code>, <code>ppb</code> or
<code>ppt</code>.</dd>
<dt>conc_units_list</dt>
<dd>list of possible units for gas concentration.</dd>
<dt>amount_units</dt>
<dd>list of possible units for amount.</dd>
<dt>surface_units</dt>
<dd>list of possible units for surface.</dd>
<dt>time_units</dt>
<dd>list of possible units for time.</dd></dl>

Arguments

Unit conversion coefficient for fluxes — flux_units

<dl>

<dt>flux_units</dt>
<dd>desired units for the calculated fluxes. Has to be of the
form amount/time/surface. Amount can be <code>mol</code>, <code>mmol</code>, <code>umol</code>, <code>nmol</code> or
<code>pmol</code>. Time can be <code>d</code> (day), <code>h</code> (hour), <code>mn</code> (minute) or <code>s</code> (seconds).
Surface can be <code>m2</code>, <code>dm2</code> or <code>cm2</code>.</dd>


<dt>conc_units</dt>
<dd>units of gas concentration <code>mmol/mol</code>, <code>ppm</code>, <code>ppb</code> or
<code>ppt</code>.</dd>


<dt>conc_units_list</dt>
<dd>list of possible units for gas concentration.</dd>


<dt>amount_units</dt>
<dd>list of possible units for amount.</dd>


<dt>surface_units</dt>
<dd>list of possible units for surface.</dd>


<dt>time_units</dt>
<dd>list of possible units for time.</dd>

</dl>

flux_units: Unit conversion coefficient for fluxes

Description

Usage

Value

Arguments

Details

Examples