Preprints
https://doi.org/10.5194/hess-2022-216
https://doi.org/10.5194/hess-2022-216
 
14 Jun 2022
14 Jun 2022

Understanding the diurnal cycle of land-atmosphere interactions from flux site observations

Eunkyo Seo and Paul Alan Dirmeyer Eunkyo Seo and Paul Alan Dirmeyer
  • Center for Ocean-Land-Atmosphere Studies, George Mason University, Fairfax, 22030, United States

Abstract. Land–atmosphere interactions have been investigated at daily or longer time scales due to limited data availability and large sensor errors for measuring high-frequency signals. Yet coupling at the sub-daily time scale is characterized by the diurnal cycle of incoming solar radiation and soil wetness. Based on flux tower observations, this study investigates the climatology of the observed land–atmosphere interactions on a sub-daily time scale during the warm season. Process-based multivariate metrics are employed to quantitatively measure the segmented coupling processes and the mixing diagram is adopted to demonstrate the integrative moist and thermal energy budget evolution in the atmospheric mixed layer. The land, atmosphere, and combined couplings for the entire daily mean, midday, and midnight show the different situations to which surface latent and sensible heat fluxes are relevant, and they also reveal the climate sensitivity to soil moisture and surface air temperature. The coevolution of the diurnal moisture and thermal energy within the boundary layer traces a particular path on mixing diagrams, exhibiting different degrees of hysteresis in water– and energy–limited locations. Water– and energy–limited processes also show opposing long tails during the daytime and night-time related to the impact on the land and atmospheric couplings via latent heat flux and other diabatic processes like radiative cooling. This study illustrates the necessity of considering the whole diurnal cycle to understand land-atmosphere coupling processes comprehensively in observations and modelling.

Journal article(s) based on this preprint

Eunkyo Seo and Paul Alan Dirmeyer

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2022-216', Jordi Vila-Guerau de Arellano, 06 Jul 2022
    • AC1: 'Reply on RC1', Eunkyo Seo, 12 Aug 2022
  • RC2: 'Comment on hess-2022-216', Timothy Lahmers, 08 Aug 2022
    • AC2: 'Reply on RC2', Eunkyo Seo, 12 Aug 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to revisions (further review by editor and referees) (16 Aug 2022) by Miriam Coenders-Gerrits
AR by Una Miškovic on behalf of the Authors (19 Aug 2022)  Author's response    Author's tracked changes
ED: Referee Nomination & Report Request started (19 Aug 2022) by Miriam Coenders-Gerrits
RR by Jordi Vila-Guerau de Arellano (15 Sep 2022)
ED: Publish subject to minor revisions (review by editor) (16 Sep 2022) by Miriam Coenders-Gerrits
AR by Eunkyo Seo on behalf of the Authors (25 Sep 2022)  Author's response    Author's tracked changes    Manuscript
ED: Publish as is (14 Oct 2022) by Miriam Coenders-Gerrits

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2022-216', Jordi Vila-Guerau de Arellano, 06 Jul 2022
    • AC1: 'Reply on RC1', Eunkyo Seo, 12 Aug 2022
  • RC2: 'Comment on hess-2022-216', Timothy Lahmers, 08 Aug 2022
    • AC2: 'Reply on RC2', Eunkyo Seo, 12 Aug 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to revisions (further review by editor and referees) (16 Aug 2022) by Miriam Coenders-Gerrits
AR by Una Miškovic on behalf of the Authors (19 Aug 2022)  Author's response    Author's tracked changes
ED: Referee Nomination & Report Request started (19 Aug 2022) by Miriam Coenders-Gerrits
RR by Jordi Vila-Guerau de Arellano (15 Sep 2022)
ED: Publish subject to minor revisions (review by editor) (16 Sep 2022) by Miriam Coenders-Gerrits
AR by Eunkyo Seo on behalf of the Authors (25 Sep 2022)  Author's response    Author's tracked changes    Manuscript
ED: Publish as is (14 Oct 2022) by Miriam Coenders-Gerrits

Journal article(s) based on this preprint

Eunkyo Seo and Paul Alan Dirmeyer

Eunkyo Seo and Paul Alan Dirmeyer

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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
This study presents the climatology of the observed land–atmosphere interactions on a sub-daily time scale during the warm season from flux site observations. Multivariate metrics are employed to examine the land, atmosphere, and combined couplings, and a mixing diagram is adopted to understand the coevolution of the moist and thermal energy budget within the atmospheric mixed layer. The diurnal cycles of both mixing diagrams and hourly land-atmosphere couplings exhibit hysteresis.