Zhao, P; Lüers, J: Parameterization of Evapotranspiration Estimation for Two Typical East Asian Crops, atmosphere, 8(6), 111 (2017), doi:10.3390/atmos8060111 [Link]
Abstract:

Estimation of evapotranspiration plays an important role in understanding the water cycle on the earth, especially the water budget in agricultural ecosystems. The parameterization approach of the Penman-Monteith-Katerji-Perrier (PM-KP) model, accounting for the influence of meteorological variables and aerodynamic resistance on surface resistance, was proposed in the literature, but it has not been applied to Asian croplands, and its error and sensitivity have not been reported yet. In this study, the estimation of evapotranspiration on half-hourly scale was carried out for two typical East Asian cropland research sites, and evaluated by using eddy-covariance measurements corrected with the energy-balance-closure concept. Sensitivity coefficients as well as systematic bias and random errors of the PM-KP approach were used to evaluate the model performance. Different distributions of the calibration coefficients between different crops were reported for the first time, indicating that the calibration of this model was more stable for the rice field than for the potato field. The commonly-used parameterization approach suggested by the Food and Agriculture Organization (FAO) was used as reference and was site-specifically optimized. The results suggest that the PM-KP approach would be a better alternative than the PM-FAO approach for estimating evapotranspiration for the flooded rice field, and an acceptable alternative for rain-fed croplands when the soil is well watered and the air is humid during the summer monsoon.

Aktuelle Termine



BayCEER-Kolloquium:
Do. 19.10.2017
- folgt -
Ökologisch-Botanischer Garten:
So. 01.10.2017
Herberge für Specht & Co.: Die Streuobstwiese
So. 15.10.2017
Der ÖBG zum Kennenlernen: Allgemeine Gartenführung
Symposium:
Do. 05.10.2017
Bayreuther Klimaschutzsymposium 2017
Workshop:
Do. 12.10.2017
BayCEER Workshop 2017
Wetter Versuchsflächen
Luftdruck (356m): 977.6 hPa
Lufttemperatur: 9.3 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 1.4 km/h
Wind (Max.): 2.9 km/h
Windrichtung: SW

...mehr
Globalstrahlung: 114 W/m²
Lufttemperatur: 9.6 °C
Niederschlag: 0.1 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 2.2 km/h
Wind (Max.): 5.5 km/h

...mehr