TY  - JOUR
A1  - Müller Schmied, Hannes
A1  - Müller, Richard
A1  - Sanchez-Lorenzo, Arturo
A1  - Ahrens, Bodo
A1  - Wild, Martin
T1  - Evaluation of radiation components in a global freshwater model with station-based observations
T2  - Water
N2  - In many hydrological models, the amount of evapotranspired water is calculated using the potential evapotranspiration (PET) approach. The main driver of several PET approaches is net radiation, whose downward components are usually obtained from meteorological input data, whereas the upward components are calculated by the model itself. Thus, uncertainties can be large due to both the input data and model assumptions. In this study, we compare the radiation components of the WaterGAP Global Hydrology Model, driven by two meteorological input datasets and two radiation setups from ERA-Interim reanalysis. We assess the performance with respect to monthly observations provided by the Baseline Surface Radiation Network (BSRN) and the Global Energy Balance Archive (GEBA). The assessment is done for the global land area and specifically for energy/water limited regions. The results indicate that there is no optimal radiation input throughout the model variants, but standard meteorological input datasets perform better than those directly obtained by ERA-Interim reanalysis for the key variable net radiation. The low number of observations for some radiation components, as well as the scale mismatch between station observations and 0.5° × 0.5° grid cell size, limits the assessment.
KW  - global hydrological modeling
KW  - radiation
KW  - validation with station observations
KW  - BSRN
KW  - GEBA
KW  - uncertainty
Y1  - 2016
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/45136
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-451365
SN  - 2073-4441
N1  - © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
VL  - 8
IS  - 10, Art. 450
SP  - 1
EP  - 25
PB  - MDPI
CY  - Basel
ER  -