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Responses of Australian Dryland Vegetation to the 2019 Heat Wave at a Subdaily Scale
Author(s) -
Qiu Bo,
Ge Jun,
Guo Weidong,
Pitman Andrew J.,
Mu Mengyuan
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl086569
Subject(s) - environmental science , vegetation (pathology) , eddy covariance , atmospheric sciences , satellite , heat wave , climatology , enhanced vegetation index , normalized difference vegetation index , ecosystem , climate change , vegetation index , geology , oceanography , medicine , pathology , ecology , aerospace engineering , engineering , biology
Satellite solar‐induced chlorophyll fluorescence (SIF) products from the Global Ozone Monitoring Experiment 2 (GOME‐2) and Orbiting Carbon Observatory 2 (OCO‐2) are used to investigate the responses of vegetation growth to the 2019 heat wave in Australia. Both satellite SIF data sets are more sensitive to water and heat stress than is the greenness‐based vegetation index (enhanced vegetation index). Moreover, the OCO‐2 SIF observations show a more significant reduction and earlier response to the heat stress than does GOME‐2 SIF, indicating that the two satellite SIF data sets differ in how they monitor the drought and heat wave event due to the different timing of observations. Eddy covariance measurements confirm the different responses of dryland vegetation to the 2019 heat wave at a subdaily time scale. The differences in the timing of the satellite SIF products can be used to assess different elements of the impact of heat and water stress on Australian dryland ecosystems.