Hydrological modelling on atmospheric grids: using graphs of sub-grid elements to transport energy and water
-
Published:2023-05-12
Issue:9
Volume:16
Page:2583-2606
-
ISSN:1991-9603
-
Container-title:Geoscientific Model Development
-
language:en
-
Short-container-title:Geosci. Model Dev.
Author:
Polcher JanORCID, Schrapffer AnthonyORCID, Dupont Eliott, Rinchiuso LuciaORCID, Zhou XudongORCID, Boucher OlivierORCID, Mouche Emmanuel, Ottlé CatherineORCID, Servonnat Jérôme
Abstract
Abstract. Land surface models (LSMs) use the atmospheric grid as their basic spatial decomposition because their main objective is to provide the lower boundary conditions to the atmosphere. Lateral water flows at the surface on the other hand require a much higher spatial discretization as they are
closely linked to topographic details. We propose here a methodology to automatically tile the atmospheric grid into hydrological coherent units
which are connected through a graph. As water is transported on sub-grids of the LSM, land variables can easily be transferred to the routing
network and advected if needed. This is demonstrated here for temperature. The quality of the river networks generated, as represented by the
connected hydrological transfer units, are compared to the original data in order to quantify the degradation introduced by the discretization
method. The conditions the sub-grid elements impose on the time step of the water transport scheme are evaluated, and a methodology is proposed to
find an optimal value. Finally the scheme is applied in an off-line version of the ORCHIDEE (Organising Carbon and Hydrology In Dynamic Ecosystems) LSM over Europe to show that realistic river discharge
and temperatures are predicted over the major catchments of the region. The simulated solutions are largely independent of the atmospheric grid used
thanks to the proposed sub-grid approach.
Publisher
Copernicus GmbH
Reference53 articles.
1. Barella-Ortiz, A., Polcher, J., de Rosnay, P., Piles, M., and Gelati, E.:
Comparison of measured brightness temperatures from SMOS with modelled ones from ORCHIDEE and H-TESSEL over the Iberian Peninsula, Hydrol. Earth Syst. Sci., 21, 357–375, https://doi.org/10.5194/hess-21-357-2017, 2017. a 2. Beck, H. E., van Dijk, A. I. J. M., Levizzani, V., Schellekens, J., Miralles, D. G., Martens, B., and de Roo, A.:
MSWEP: 3-hourly 0.25∘ global gridded precipitation (1979–2015) by merging gauge, satellite, and reanalysis data, Hydrol. Earth Syst. Sci., 21, 589–615, https://doi.org/10.5194/hess-21-589-2017, 2017. a, b 3. Becker, A., Finger, P., Meyer-Christoffer, A., Rudolf, B., Schamm, K., Schneider, U., and Ziese, M.:
A description of the global land-surface precipitation data products of the Global Precipitation Climatology Centre with sample applications including centennial (trend) analysis from 1901–present, Earth Syst. Sci. Data, 5, 71–99, https://doi.org/10.5194/essd-5-71-2013, 2013. a 4. Bernus, A. and Ottlé, C.:
Modeling subgrid lake energy balance in ORCHIDEE terrestrial scheme using the FLake lake model, Geosci. Model Dev., 15, 4275–4295, https://doi.org/10.5194/gmd-15-4275-2022, 2022. a, b 5. Branstetter, M. L.:
Continental runoff dynamics in the Community Climate System Model 2 (CCSM2) control simulation, J. Geophys. Res., 108, 4550, https://doi.org/10.1029/2002JD003212, 2003. a
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|