Monitoring ecohydrological dynamics of Australian semiarid shrublands using Advanced Himawari Imager

SRIVASTAVA, A.; HOLZMAN, M.; SIDIQUI, P.; YOU, Y.; QIN, Y.; CLEVERLY, J.; HUETE, A.

Conferencia; iLEAPS2023; 2023

Australian/New Zealand Network for eddy covariance measurements (OzFlux)

Objectives of the study:-To assess the capability of Advanced Himawari Imager-8 (AHI-8) data to track ecohydrologic wet pulses and their impact on vegetation productivity.-To evaluate the relationships between geostationary AHI vegetation indices (VIs) and ecohydrological variables. -To evaluate the UTS group atmosphere and sun-view geometry corrected daily AHI product at 0.1 degree (SZA=45 and VZA=0) and to compare with the polar orbiting 8-day MODIS MAIAC (SZA=45 and VZA=0) product.Our findings indicate that AHI-8 data have the potential to provide continuous, increased temporal resolution of vegetation dynamics. The AHI-8 data is shown to be useful to monitor vegetation response to wet pulses at daily scale, considering the pattern of Ozflux tower GPP measurements.Results showed strong relationships among vegetation indices AHI satellite data and GPP in response to evapotranspiration. These findings will improve the understanding of ecohydrological dynamics of Australian semiarid vegetation and provide more consistent monitoring across variable wet and dry vegetation patterns.Investigating BRDF influences, as done here, is nevertheless a major step forward and appears to be the dominant driver of cross-sensor variations between Himawari-8 AHI VIs and MODIS VIs.