Total Ozone from Sounding - RS41-D - RS41-SG - RS41-SGM - RS41-SGP

RS41 Ozone Soundings User Guide

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The total ozone from the sounding is calculated by summing up the amount of ozone in the layers between two measurement points as expressed in the equation below. When using the units indicated in the list below, the equation gives the total ozone in units of grams per square meter (g/m2).

Table 1. Total Ozone from Sounding
Item Explanation
1.6571, ratio of molecular masses of ozone and air
g 9.80665 m/s2, acceleration of gravity
pi ... pi+n Ambient pressure [hPa]
i Index for a measurement point
p3i ... p3i+n Ozone partial pressure [mPa]
M3 48.00 g/mol, molar mass of ozone

When the constants are inserted into the equation, it reduces to:

The equation above gives the ozone in grams per square meter (g/m2).

A commonly used unit for total ozone is Dobson Unit (DU = 2.687 × 1020 molecules/m2). To get the result in DUs, ozone grams must first be divided by molar mass of ozone 48.00 g/mol and then multiplied by Avogadro's number 6.02217 × 1023 molecules/mol. The result is ozone in molecules/m2. The unit relation above is used to convert this to DUs.

The following equation gives the result in DUs when the partial pressures are given in mPa and ambient pressures in hPa.