Boyd, D.S., Foody, G.M. and Phipps, P.C.
Dynamics of ENSO drought events on Sabah rainforests observed by NOAA AVHRR
International Journal of Remote Sensing, 27, (11), . (doi:10.1080/01431160500396527).
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Drought, associated with the El Nin˜o Southern Oscillation (ENSO), can have
considerable impact on tropical rainforests. Concern over drought, particularly
given the possibility of an increase in its occurrence and intensity, has fostered a
desire for an increased understanding of drought events and their impact to
inform the development of a drought monitoring system. This paper investigates
the use of National Oceanic and Atmospheric Administration (NOAA)
Advanced Very High Resolution Radiometer (AVHRR) data in a drought
monitoring system for the rainforests of Sabah, Borneo. These rainforests are
dynamic with respect to their coupling with ENSO processes and in their
biophysical properties, and such dynamism may have implications for how
NOAA AVHRR data may be used. In particular, this paper explores the
transferability of relationships between a drought indicator (rainfall) and the
response of the rainforest, as measured by four NOAA AVHRR variables
(middle infrared reflectance; VI3; Ts/VI3 and Ts/NDVI), under particular site
conditions. It was found that both spatial variability in forest biophysical
properties and geographical variability in drought impact had implications for
the transferability of relationships developed under local conditions across Sabah
rainforests within a drought monitoring system. Suggestions are presented for
how NOAA AVHRR data could be used, with a new drought monitoring index –
the Ts/VI3 – recommended.
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