Preprints
https://doi.org/10.5194/egusphere-2023-1224
https://doi.org/10.5194/egusphere-2023-1224
09 Jun 2023
 | 09 Jun 2023

Role of thermodynamic and turbulence processes on the fog life cycle during SOFOF3D experiment

Cheikh Dione, Martial Haeffelin, Frédéric Burnet, Christine Lac, Guylaine Canut, Julien Delanoë, Jean-Charles Dupont, Susana Jorquera, Pauline Martinet, Jean-François Ribaud, and Felipe Toledo

Abstract. In this study, we use a synergy of in-situ and remote sensing measurements collected during the Southwest FOGs 3D experiment for processes study (SOFOG3D) field campaign in autumn 2019 and winter 2020, to analyze the thermodynamic and turbulence processes related to fog formation, evolution, and dissipation across southwestern France. Based on a unique dataset with a very high resolution and a fog conceptual model, an analysis of the four heaviest fog episodes (two radiation fogs and two advection-radiation fogs) is conducted. The results show that radiation and advection-radiation fogs form under deep and thin temperature inversion, respectively. For both fog categories, the transition period from stable to adiabatic fog and the fog adiabatic phase are driven by vertical mixing associated with an increase in turbulence in the fog layer due to mechanical production (turbulence kinetic energy (TKE) up to 0.4 m2 s-2 and vertical velocity variance (σw2) up to 0.04 m2 s-2) generated by brisk wind at the supersite (advection). The dissipation time is observed at night for the advection-radiation fog case studies and during the day for the radiation fog case studies. Night-time dissipation is driven by horizontal advection generating mechanical turbulence (TKE at least 0.3 m2 s-2 and σw2 larger than 0.04 m2 s-2). Daytime dissipation is linked to the combination of thermal and mechanical turbulence related respectively to solar heating (near surface sensible heat flux larger than 10 W m-2) and advection. Through a deficit of the fog reservoir of liquid water path, the fog conceptual model estimates the dissipation time at least one hour before the observed dissipation for radiation fog cases. It gives a better estimate of the fog dissipation time for advection-radiation cases. This study also demonstrates the importance of using instrumental synergy (with microwave radiometer, wind lidar, weather station, and cloud radar) and a fog conceptual model to better predict fog characteristics and dissipation time at nowcasting ranges.

Journal article(s) based on this preprint

21 Dec 2023
Role of thermodynamic and turbulence processes on the fog life cycle during SOFOG3D experiment
Cheikh Dione, Martial Haeffelin, Frédéric Burnet, Christine Lac, Guylaine Canut, Julien Delanoë, Jean-Charles Dupont, Susana Jorquera, Pauline Martinet, Jean-François Ribaud, and Felipe Toledo
Atmos. Chem. Phys., 23, 15711–15731, https://doi.org/10.5194/acp-23-15711-2023,https://doi.org/10.5194/acp-23-15711-2023, 2023
Short summary

Cheikh Dione et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1224', Anonymous Referee #1, 18 Jul 2023
  • RC2: 'Comment on egusphere-2023-1224', Anonymous Referee #2, 24 Jul 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1224', Anonymous Referee #1, 18 Jul 2023
  • RC2: 'Comment on egusphere-2023-1224', Anonymous Referee #2, 24 Jul 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Cheikh Dione on behalf of the Authors (30 Oct 2023)  Author's tracked changes   Manuscript 
EF by Sarah Buchmann (01 Nov 2023)  Author's response 
ED: Referee Nomination & Report Request started (07 Nov 2023) by Thijs Heus
RR by Anonymous Referee #2 (21 Nov 2023)
ED: Publish as is (01 Dec 2023) by Thijs Heus
AR by Cheikh Dione on behalf of the Authors (07 Dec 2023)  Author's response   Manuscript 

Journal article(s) based on this preprint

21 Dec 2023
Role of thermodynamic and turbulence processes on the fog life cycle during SOFOG3D experiment
Cheikh Dione, Martial Haeffelin, Frédéric Burnet, Christine Lac, Guylaine Canut, Julien Delanoë, Jean-Charles Dupont, Susana Jorquera, Pauline Martinet, Jean-François Ribaud, and Felipe Toledo
Atmos. Chem. Phys., 23, 15711–15731, https://doi.org/10.5194/acp-23-15711-2023,https://doi.org/10.5194/acp-23-15711-2023, 2023
Short summary

Cheikh Dione et al.

Cheikh Dione et al.

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
1. This paper document the role of thermodynamic and turbulence on the fog life cycle over southwestern France. 2. It is base on a unique dataset collected during the SOFOG3D field campaign in Autumn 2019 and Winter 2020. 3. The paper gives threshold in turbulence driving the different phases of fog life cycle and the role of advection in the nighttime dissipation of fog. 4. The results can be operationalize to nowcast fog and improve it short range forecast in numerical weather prediction model.