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Changes in water clarity in response to river discharges on the Great Barrier Reef continental shelf: 2002-2013

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dc.contributor Australian Institute Of Marine Science
dc.contributor Sch Geog Planning & Environm Management
dc.contributor James Cook Univ
dc.contributor University Of Queensland
dc.contributor James Cook University
dc.contributor Queensland University Of Technology (qut)
dc.contributor Ctr Trop Water & Aquat Ecosyst Res
dc.contributor Univ Queensland
dc.contributor Biophys Oceanog Grp
dc.contributor Australian Inst Marine Sci
dc.contributor.author BRODIE, J.
dc.contributor.author FABRICIUS, K. E.
dc.contributor.author LOGAN, M.
dc.contributor.author WEEKS, S. J.
dc.contributor.author LEWIS, S. E.
dc.date.accessioned 2016-05-26T00:16:48Z
dc.date.accessioned 2017-03-21T01:06:16Z
dc.date.accessioned 2017-03-21T01:06:16Z
dc.date.accessioned 2019-05-09T01:24:19Z
dc.date.available 2017-03-21T01:06:16Z
dc.date.available 2016-05-26T00:16:48Z
dc.date.available 2016-05-26T00:16:48Z
dc.date.available 2019-05-09T01:24:19Z
dc.date.issued 2016-05-05
dc.identifier.citation Fabricius KE, Logan M, Weeks SJ, Lewis SE, Brodie J (2016) Changes in water clarity in response to river discharges on the Great Barrier Reef continental shelf: 2002-2013. Estuarine, Coastal and Shelf Science 173: A1-A16 en_US
dc.identifier.issn 0272-7714
dc.identifier.uri http://epubs.aims.gov.au/11068/12520
dc.description Acknowledge the following data sources: The State of Queensland's Department of Environment and Heritage Protection provided the wave rider buoy data, the Department of Natural Resources and Mines the daily data of freshwater discharge volumes of the main rivers, the Bureau of Meteorology provided the rainfall and wind data, and the Australian Navy provided the tidal estimates. en_US
dc.description.abstract Water clarity is a key factor for the health of marine ecosystems. The Australian Great Barrier Reef (GBR) is located on a continental shelf, with >35 major seasonal rivers discharging into this 344,000 km(2) tropical to subtropical ecosystem. This work investigates how river discharges affect water clarity in different zones along and across the GBR. For each day over 11 years (2002-2013) we calculated 'photic depth' as a proxy measure of water clarity (calibrated to be equivalent to Secchi depth), for each 1 km2 pixel from MODIS-Aqua remote sensing data. Long-term and seasonal changes in photic depth were related to the daily discharge volumes of the nearest rivers, after statistically removing the effects of waves and tides on photic depth. The relationships between photic depths and rivers differed across and along the GBR. They typically declined from the coastal to offshore zones, and were strongest in proximity to rivers in agriculturally modified catchments. In most southern inner zones, photic depth declined consistently throughout the 11-year observation period; such long-term trend was not observed offshore nor in the northern regions. Averaged across the GBR, photic depths declined to 47% of local maximum values soon after the onset of river floods, and recovery to 95% of maximum values took on average 6 months (range: 150-260 days). The river effects were strongest at latitude 14.5 degrees-19.0 degrees S, where river loads are high and the continental shelf is narrow. Here, even offshore zones showed a >40% seasonal decline in photic depth, and 17-24% reductions in annual mean photic depth in years with large river nutrients and sediment loads. Our methodology is based on freely available data and tools and may be applied to other shelf systems, providing valuable insights in support of ecosystem management. (C) 2016 The Authors. Published by Elsevier Ltd.
dc.description.sponsorship Many thanks to Ana Rodriguez and Marites Canto for help in processing the remote sensing data, and to the NASA Ocean Biology Processing Group for both the SeaWiFS and MODIS-Aqua satellite to-in situ matchups for the Secchi depth data. Many thanks also to Ivan Valiela, Mike Risk and Glenn De'ath for constructive comments that greatly improved the manuscript. We gratefully acknowledge the following data sources: The State of Queensland's Department of Environment and Heritage Protection provided the wave rider buoy data, the Department of Natural Resources and Mines the daily data of freshwater discharge volumes of the main rivers, the Bureau of Meteorology provided the rainfall and wind data, and the Australian Navy provided the tidal estimates. The study was funded by the Australian Government's National Environmental Research Program - Tropical Ecosystems Hub (NERP Project 4.1), and the Australian Marine Institute of Marine Science.
dc.description.sponsorship The study was funded by the Australian Government's National Environmental Research Program - Tropical Ecosystems Hub (NERP Project 4.1), and the Australian Marine Institute of Marine Science. en_US
dc.description.uri http://www.sciencedirect.com/science/article/pii/S0272771416300634 en_US
dc.language English
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartof Null
dc.rights Attribution 3.0 Australia *
dc.rights.uri http://creativecommons.org/licenses/by/3.0/au/ *
dc.subject Turbidity en_US
dc.subject Crown-of-thorns Starfish en_US
dc.subject Tropical Coral Reefs en_US
dc.subject Continental Shelf Seas en_US
dc.subject Water Clarity en_US
dc.subject Photic Depth en_US
dc.subject Coastal Waters
dc.subject Coral-reefs
dc.subject Australia
dc.subject Spatiotemporal Patterns
dc.subject Flood-plume
dc.subject Inner-shelf
dc.subject Tampa Bay
dc.subject Marine & Freshwater Biology
dc.subject Suspended Sediment
dc.subject Oceanography
dc.subject Fine Sediment
dc.title Changes in water clarity in response to river discharges on the Great Barrier Reef continental shelf: 2002-2013
dc.type journal article en_US
dc.identifier.doi 10.1016/j.ecss.2016.03.001
dc.identifier.wos WOS:000375813100002


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