Preprints
https://doi.org/10.5194/amt-2021-213
https://doi.org/10.5194/amt-2021-213

  26 Jul 2021

26 Jul 2021

Review status: a revised version of this preprint is currently under review for the journal AMT.

Calculating the vertical column density of O4 from surface values of pressure, temperature and relative humidity

Steffen Beirle, Christian Borger, Steffen Dörner, Vinod Kumar, and Thomas Wagner Steffen Beirle et al.
  • Max-Planck-Institut für Chemie

Abstract. We present a formalism that relates the vertical column density (VCD) of the oxygen collision complex O2-O2 (denoted as O4 below) to surface (2 m) values of temperature and pressure, based on physical laws. In addition, we propose an empirical modification which also accounts for surface relative humidity (RH). This allows for simple and quick calculation of the O4 VCD without the need for constructing full vertical profiles. The parameterization reproduces the real O4 VCD, as derived from vertically integrated profiles, within −0.9 % ± 1.0 % for WRF simulations around Germany, 0.1 % ± 1.2 % for global reanalysis data (ERA5), and −0.4 % ± 1.4 % for GRUAN radiosonde measurements around the world. When applied to measured surface values, uncertainties of 1 K, 1 hPa, and 16 % for temperature, pressure, and RH correspond to relative uncertainties of the O4 VCD of 0.3 %, 0.2 %, and 1 %, respectively. The proposed parameterization thus provides a simple and accurate formula for the calculation of the O4 VCD which is expected to be useful in particular for MAX-DOAS applications.

Steffen Beirle et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-213', Anonymous Referee #1, 02 Aug 2021
  • RC2: 'Comment on amt-2021-213', Anonymous Referee #2, 26 Aug 2021

Steffen Beirle et al.

Steffen Beirle et al.

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Short summary
We present a formalism that relates the vertical column density (VCD) of the oxygen collision complex O4 to surface values of temperature and pressure, based on physical laws. In addition, we propose an empirical modification which also accounts for surface relative humidity (RH). This allows for simple and quick but still accurate calculation of the O4 VCD without the need for constructing full vertical profiles, which is expected to be useful in particular for MAX-DOAS applications.