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Influence of the 2015–2016 El Niño on the record-breaking mangrove dieback along northern Australia coast
Abhik, S.; Hope, P.; Hendon, H.H.; Hutley, L.B.; Johnson, S.; Drosdowsky, W.; Brown, J.R.; Duke, N.C. (2021). Influence of the 2015–2016 El Niño on the record-breaking mangrove dieback along northern Australia coast. NPG Scientific Reports 11(1): 20411. https://dx.doi.org/10.1038/s41598-021-99313-w
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322
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| Auteurs | | Top |
- Abhik, S.
- Hope, P.
- Hendon, H.H.
- Hutley, L.B.
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- Johnson, S.
- Drosdowsky, W.
- Brown, J.R.
- Duke, N.C.
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| Abstract |
This study investigates the underlying climate processes behind the largest recorded mangrove dieback event along the Gulf of Carpentaria coast in northern Australia in late 2015. Using satellite-derived fractional canopy cover (FCC), variation of the mangrove canopies during recent decades are studied, including a severe dieback during 2015–2016. The relationship between mangrove FCC and climate conditions is examined with a focus on the possible role of the 2015–2016 El Niño in altering favorable conditions sustaining the mangroves. The mangrove FCC is shown to be coherent with the low-frequency component of sea level height (SLH) variation related to the El Niño Southern Oscillation (ENSO) cycle in the equatorial Pacific. The SLH drop associated with the 2015–2016 El Niño is identified to be the crucial factor leading to the dieback event. A stronger SLH drop occurred during austral autumn and winter, when the SLH anomalies were about 12% stronger than the previous very strong El Niño events. The persistent SLH drop occurred in the dry season of the year when SLH was seasonally at its lowest, so potentially exposed the mangroves to unprecedented hostile conditions. The influence of other key climate factors is also discussed, and a multiple linear regression model is developed to understand the combined role of the important climate variables on the mangrove FCC variation. |
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