ENSO impact on the Australian vegetation: A satellite diagnostic from 1998 - 2006

P Maisongrande, J Kuhlmann, J Boulet, A Lobo, P Henry, Mohsin Hafeez

Research output: Book chapter/Published conference paperConference paperpeer-review

1 Citation (Scopus)
12 Downloads (Pure)

Abstract

The modelling of water and energy exchanges between Soil-Vegetation and the ATmosphere(SVAT) often assimilates remotely sensed time series of Vegetation Indices (VIs). At first order,spectral combinations like the NormalizedDifference Vegetation Index (NDVI) are known for their ability to witness the geographic and seasonal distribution of greenness on continental surfaces. Another usual combination is theShortWave Vegetation Index (SWVI), which is more sensitive to the vegetation structure andwater content than NDVI (Gao et al. 1996).According to recent published studies (e.g. Maki etal. 2006), the difference between NDVI andSWVI (Δ hereafter) should theoretically relate to the vegetation water stress.In the present study, we evaluate the ability ofthese indices to monitor the Australian vegetation behaviour to ENSO induced precipitation anomalies. Thanks to 9 year time series of SPOT/VEGETATION kilometric imagery(1998-2006), we calculate the standard seasonality for these 3 spectral indices and we compare it with ENSO quantitative indices like the Southern Oscillation Index (SOI) proposed by Troup (1965).Although the SOI is only a temporal index, we use it as a general indicator for the water stress probability.According to our results, Δ presents a better correlation with SOI than NDVI or SWVI anomalies at seasonal time scale (1 to 3 years considered at the monthly time step).In 2005, a field campaign named NAFE (NationalAirborne Field Experiment) was carried on in aspecific region of New South Wales. In this region, our results concerning Δ are confirmed and further investigations are now planed in order to take advantage of the NAFE in situ measurements(like soil moisture and vegetation water content).By that time the SPOT VEGETATION archive is still growing since SPOT5/VEGETATION2 should operate until late 2011 and a project for a VEGETATION Follow-On mission is under study at French and European Space Agencies.
Original languageEnglish
Title of host publicationLand, Water and Environmental Management
Subtitle of host publicationIntegrated Systems for Sustainability: International Congress on Modelling and Simulation
EditorsLes Oxley, Don Kulasiri
Place of PublicationChristchurch, New Zealand
PublisherModelling and Simulation Society of Australia and New Zealand
Pages2583-2589
Number of pages7
ISBN (Electronic)9780975840047
Publication statusPublished - 2007
EventInternational Congress on Modelling and Simulation (MODSIM) - Christchurch, New Zealand
Duration: 10 Dec 200713 Dec 2007

Conference

ConferenceInternational Congress on Modelling and Simulation (MODSIM)
CountryNew Zealand
CityChristchurch
Period10/12/0713/12/07

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