sensortoolkit.calculate._dewpoint

This module estimates dewpoint via ambient temperature and relative humidity measurements made by independent temperature and relative humidity instruments running alonside sensors and FRM/FEM instrumentation at the evaluation site.

Caution

DP should not be calculated using on-board temperature and relative humidity sensor measurements (if applicable), as these measurements may not accurately represent ambient temperature and relative humidity conditions.

Calculation

Dewpoint is estimated via the Magnus Formula,

\[DP_{d} = \lambda \times \left[ \frac{\ln(\frac{RH_i}{100}) + \frac{ \beta\times T_i}{\lambda + T_i} }{\beta - \ln(\frac{RH_i}{100} - \frac{\beta\times T_i}{\lambda + T_i})} \right]\]

where

\(\beta\) = 17.625

\(\lambda\) = 243.04

\(DP_i\) = valid ambient dewpoint for measurement interval \(i\) (°C).

\(RH_i\) = valid ambient relative humidity for measurement interval \(i\) (%).

\(T_i\) = valid ambient temperature for measurement interval \(i\) (°C).


@Author:
Samuel Frederick, NSSC Contractor (ORAU)
U.S. EPA / ORD / CEMM / AMCD / SFSB
Created:

Mon Jan 27 11:42:49 2020

Last Updated:

Tue Jul 13 09:35:33 2021

Functions

dewpoint

Calculate dewpoint using the Magnus Formula.