Assessing the potential for satellite image monitoring of seagrass thermal dynamics: for inter-and shallow sub-tidal seagrasses in the inshore Great Barrier Reef World Heritage Area, Australia

Phinn, S.R., Kovacs, E.M., Roelfsema, C.M., Canto, R.F., Collier, C.J., and McKenzie, L.J. (2018) Assessing the potential for satellite image monitoring of seagrass thermal dynamics: for inter-and shallow sub-tidal seagrasses in the inshore Great Barrier Reef World Heritage Area, Australia. International Journal of Digital Earth, 11 (8). pp. 803-824.

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Abstract

Seagrass meadows are at increasing risk of thermal stress and recent work has shown that water temperature around seagrass meadows could be used as an indicator for seagrass condition. Satellite thermal data have not been linked to the thermal properties of seagrass meadows. This work assessed the covariation between 20 in situ average daily temperature logger measurement sites in tropical seagrass meadows and satellite derived daytime SST (sea surface temperature) from the daytime MODIS and Landsat sensors along the Great Barrier Reef coast in Australia. Statistically significant (R2 = 0.787–0.939) positive covariations were found between in situ seagrass logger temperatures and MODIS SST temperature and Landsat sensor temperatures at all sites along the reef. The MODIS SST were consistently higher than in situ temperature at the majority of the sites, possibly due to the sensor’s larger pixel size and location offset from field sites. Landsat thermal data were lower than field-measured SST, due to differences in measurement scales and times. When refined significantly and tested over larger areas, this approach could be used to monitor seagrass health over large (106 km2) areas in a similar manner to using satellite SST for predicting thermal stress for corals.

Item ID: 49855
Item Type: Article (Refereed Research - C1)
Keywords: seagrass; temperature; thermal tolerance; satellite sea surface temperature; Landsat; MODIS; Great Barrier Reef
ISSN: 1753-8955
Date Deposited: 14 Aug 2017 23:06
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 90%
06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060701 Phycology (incl Marine Grasses) @ 10%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960802 Coastal and Estuarine Flora, Fauna and Biodiversity @ 10%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 40%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 50%
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