Preprints
https://doi.org/10.5194/gmd-2021-432
https://doi.org/10.5194/gmd-2021-432

Submitted as: development and technical paper 04 Jan 2022

Submitted as: development and technical paper | 04 Jan 2022

Review status: this preprint is currently under review for the journal GMD.

Modeling subgrid lake energy balance in ORCHIDEE terrestrial scheme using the FLake lake model

Anthony Bernus and Catherine Ottlé Anthony Bernus and Catherine Ottlé
  • Laboratoire des Sciences du Climat et de l’Environnement, IPSL, CEA-CNRS-Université Paris-Saclay, Orme des Merisiers, 91190 Gif-sur-Yvette, France

Abstract. The freshwater 1-D FLake lake model was coupled to the ORCHIDEE land surface model to simulate lake energy balance at the global scale. A multi-tile approach has been chosen to allow the modelling of various types of lakes within the ORCHIDEE grid cell. The different categories have been defined according to lake depth which is the most influential parameter of FLake, but other properties could be considered in the future. Several depth parameterization strategies have been compared, differing by the way to aggregate the depth of the subgrid lakes, i.e., arithmetical, geometrical, harmonical mean and median. Five atmospheric reanalysis datasets available at 0.5° or 0.25° resolution, have been used to force the model and assess model systematic errors. Simulations have been performed, evaluated and intercompared against observations of lake water temperatures provided by the GloboLakes database over about 1000 lakes and ice phenology derived from the Global Lake and River Ice Phenology database.

The results highlighted the large impact of the atmospheric forcing on the lake energy budget simulations and the improvements brought by the highest resolution products (ERA5 and E2OFD). The median of the Root Square Mean Errors (RMSE) calculated at global scale range between 3.2 K and 2.7 K among the forcings, CRUJRA and ERA5 leading respectively to the best and worst results. Depth parameterization strategy appeared to be less influent, with RMSE differences less than 0.1 K for the four aggregation scenarios tested.

The simulation of ice phenology presented systematic errors whatever the forcing used and the depth parameterization. Freezing onset was shown to be the less sensitive to forcing and depth parameterization with median of the errors ranging between 10 and 14 days. Larger errors were observed on the simulation of the end of the freezing period significantly influenced by the atmospheric forcing used. Such errors already highlighted in previous works, could be the result of deficiencies in the modeling of snow/ice parameterization processes. Various pathways are drawn to improve the model results, including the use of remote sensing data to better constrain the lake radiative parameters (albedo and extinction coefficient) as well as the lake depth thanks to the recent and forthcoming high resolution satellite missions.

Anthony Bernus and Catherine Ottlé

Status: open (until 01 Mar 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-432', Anonymous Referee #1, 10 Jan 2022 reply
  • RC2: 'Comment on gmd-2021-432', Anonymous Referee #2, 21 Jan 2022 reply
  • RC3: 'Comment on gmd-2021-432', Anonymous Referee #3, 21 Jan 2022 reply

Anthony Bernus and Catherine Ottlé

Anthony Bernus and Catherine Ottlé

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Short summary
Lakes are often neglected in climate modeling because their spatial extent does not exceed 4 % of the Earth land area. But given the ever increasing spatial resolution of climate models and the significant role of lakes on the regional climate, we implement lakes in the land surface component ORCHIDEE of IPSL climate model with the implementation of a one-dimensional freshwater lake model (FLake). We evaluate lake surface temperature with a product derived from satellite.