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Trends in land surface evapotranspiration across China with remotely sensed NDVI and climatological data for 1981-2010
Mo X.; Liu, S.; Lin, Z.; Wang, S.; Hu, S.
Source PublicationHydrological Sciences Journal-Journal Des Sciences Hydrologiques
Keywordevapotranspiration trend inter-annual variability NDVI two-source model climate change tendance de l'evapotranspiration variabilite inter-annuelle NDVI modele a deux sources changement climatique pan evaporation potential evapotranspiration water-balance vegetation model modis catchment satellite algorithm climate
AbstractUsing satellite observations of Normalized Difference Vegetation Index (NDVI) from NOAA-AVHRR and Terra-MODIS, together with climatic data in a physical evapotranspiration (ET) model, the spatio-temporal variability of ET is investigated in terrestrial China from 1981 to 2010. The model predictions of actual ET (ETa) are validated with ET values from in situ eddy covariance flux measurements and from basin water balance calculations. The national averaged crop reference ET (ETp) and ETa values are 91621 and 415 +/- 12mm year(-1), respectively. The annual ETa pattern is closely associated with vegetation conditions in the eastern part of China, whereas ETa is low in the sparsely-vegetated areas and deserts in the northwestern region, corresponding to scarce rainfall events and amounts. The trends of ETp and ETa are remarkably different over the country, and the complementary relationship between ETp and ETa is revealed for the study period. Averaged over the whole country, ETa showed an increasing trend from the 1980s to the mid-1990s, followed by a decreasing trend, consistent with the precipitation anomaly. Across the main vegetation types, annual ETa amounts are found to correspond clearly with the bands of precipitation and ETp. Resume l'aide d'observations satellitaires dindice de vegetation NDVI de NOAA-AVHRR et Terra-MODIS et de donnees climatiques utilisees dans un modele physique d'evapotranspiration (ET), la variabilite spatio-temporelle de l'ET en Chine a ete etudiee de 1981 a 2010. Les previsionss du modele d'ET reelle (ETa) ont ete validees avec des valeurs d'ET issues de mesures de covariance de flux in situ et de calculs de bilan en eau a l'echelle du bassin. La moyenne nationale de reference de l'ET de culture (ETP) et les valeurs de l'ETa sont respectivement de 916 +/- 21 et 415 +/- 12 mm an-1. Les valeurs annuelles d'ETa sont etroitement associees aux conditions de vegetation dans la partie orientale de la Chine, alors que l'ETa est faible dans les zones a faible densite de vegetation et dans les deserts de la region Nord-Ouest, correspondant a des evenements et des quantites de precipitations rares. Les tendances d'ETp et d'ETa sont remarquablement differentes dans le pays, et la relation complementaire entre ETp et l'ETa a ete determinee pour la periode d'etude. En moyenne sur l'ensemble du pays, l'ETa est en augmentation des annees 1980 au milieu des annees 1990, puis subit une tendance a la baisse, conformement a l'anomalie de precipitation. En ce qui concerne les principaux types de vegetation, les valeurs annuelles d'ETa correspondent clairement aux bandes de precipitations et d'ETp.
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Document TypeSCI/SSCI论文
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GB/T 7714
Mo X.,Liu, S.,Lin, Z.,et al. Trends in land surface evapotranspiration across China with remotely sensed NDVI and climatological data for 1981-2010. 2015.
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