Tidal corrections for TOPEX altimetry in the Coral Sea and Great Barrier Reef Lagoon: Comparisons with long‐term tide gauge records

Burrage, Derek

doi:10.1029/2000jc000441

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…Both for regional and global models, the RMS obtained for M 2 is the highest among each model, and therefore is the one that contributes the most to the respective RSS. A similar result was found by Burrage et al, (2003) in the macro-tidal region of the Southern Great Barrier Reef Lagoon (NE Australia); they found better results with a regional model while offshore a global model showed sufficient accuracy.…”

Section: Regional Versus Global Modellingsupporting

confidence: 65%

“…In others regions of the ocean where important tides exist as well, it has been shown that regional models can more accurate by correct the altimeter data than global ones (Burrage et al, 2003;Cherniawsky et al, 2004;Foreman et al, 1998;Matsumoto et al, 2000). The objective of this work is to evaluate which tide model works best in the SWA continental shelf.…”

Section: Objectivesmentioning

confidence: 99%

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Tide model comparison over the Southwestern Atlantic Shelf

Saraceno

D’Onofrio

Fiore

et al. 2010

Continental Shelf Research

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Sea Surface Height (SSH) as measured by satellites has become a powerful tool for oceanographic and climate related studies. Whereas in the open ocean good accuracy has been achieved, more energetic dynamics and a number of calibration problems have limited applications over continental shelves and near the coast. Tidal ranges in the Southwestern Atlantic (SWA) continental shelf are among the highest in the world ocean, reaching up to 12 m at specific locations. This fact highlights the relevance of the accuracy of the tidal correction that must be applied to the satellite data to be useful in the region. In this work, amplitudes and phases of tidal constituents are extracted from five global tide models and three regional models and compared to the corresponding harmonics estimated from coastal tide-gauges (TGs) and satellite altimetry data. The Root-Sum-Square (RSS) of the misfit of the common set of the five tidal constituents solved by the models (M 2 , N 2 , S 2 , K 1 and O 1 ) is higher than 18 cm close to the coast for two of the regional models and higher than 24.5 cm for the rest of the models considered. Both values are too high to provide an accurate estimation of geostrophic non-tidal currents from satellite altimetry in the coastal region. On the other hand, the global model with the highest spatial resolution has a RSS lower than 4.5 cm over the continental shelf even when the non-linear M 4 overtide is considered. Comparison with in-situ current measurements suggests that this model can be used to de-tide altimetry data to compute large-scale patterns of SSH and associated geostrophic velocities. It is suggested that a local tide model with very high resolution that assimilates in-situ and satellite data should meet the precision 2 needed to estimate geostrophic velocities at a higher resolution both close to the coast and over the Patagonian shelf.

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Section: Regional Versus Global Modellingsupporting

confidence: 65%

Section: Objectivesmentioning

confidence: 99%

Tide model comparison over the Southwestern Atlantic Shelf

Saraceno

D’Onofrio

Fiore

et al. 2010

Continental Shelf Research

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“…They have been useful to assess the physical environment (wave, tide, circulation, lagoon water renewal) around islands and reefs (e.g., Tartinville and Rancher, 2000;Andréfouët et al, 2001Andréfouët et al, , 2012Burrage et al, 2003;Gallop et al, 2014), or explain larval connectivity and offshore physical transport between reefs (e.g., Christie et al, 2010), but this is the first time to our knowledge that altimetry data, including the new SARAL/AltiKa data, are related to a coral ecology event. Different measures of sea level and sea level anomalies confirmed an anomalous situation following the development of the 2015-2016 El Niño, resulting in lower sea level regionally averaging 8 cm in the north of Sulawesi compared to the previous 4 years ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Coral mortality induced by the 2015–2016 El-Niño in Indonesia: the effect of rapid sea level fall

Ampou

Johan²,

Menkès

et al. 2017

Biogeosciences

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Abstract. The 2015–2016 El-Niño and related ocean warming has generated significant coral bleaching and mortality worldwide. In Indonesia, the first signs of bleaching were reported in April 2016. However, this El Niño has impacted Indonesian coral reefs since 2015 through a different process than temperature-induced bleaching. In September 2015, altimetry data show that sea level was at its lowest in the past 12 years, affecting corals living in the bathymetric range exposed to unusual emersion. In March 2016, Bunaken Island (North Sulawesi) displayed up to 85 % mortality on reef flats dominated by Porites, Heliopora and Goniastrea corals with differential mortality rates by coral genus. Almost all reef flats showed evidence of mortality, representing 30 % of Bunaken reefs. For reef flat communities which were living at a depth close to the pre-El Niño mean low sea level, the fall induced substantial mortality likely by higher daily aerial exposure, at least during low tide periods. Altimetry data were used to map sea level fall throughout Indonesia, suggesting that similar mortality could be widespread for shallow reef flat communities, which accounts for a vast percent of the total extent of coral reefs in Indonesia. The altimetry historical records also suggest that such an event was not unique in the past two decades, therefore rapid sea level fall could be more important in the dynamics and resilience of Indonesian reef flat communities than previously thought. The clear link between mortality and sea level fall also calls for a refinement of the hierarchy of El Niño impacts and their consequences on coral reefs.

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“…Altimetry data have been seldom used to study coral reef processes, even in a sea level rise era that may affect coral reef communities and islands. They have been useful to assess the physical environment (wave, tide, circulation, lagoon water renewal) around islands and reefs (e.g., Tartinville and Rancher, 2000;Andréfouët et al, 2001Andréfouët et al, , 2012Burrage et al, 2003;Gallop et al, 2014), or explain larval connectivity and offshore physical transport between reefs (e.g., Christie et al, 2010), but this is the first time to our knowledge that altimetry data, including the new SARAL/AltiKa data, are related to a coral ecology event. Different measures of sea level and sea level anomalies confirmed an anomalous situation following the development of the 2015-2016 El Niño, resulting in lower sea level regionally averaging 8 cm in the north of Sulawesi compared to the previous 4 years (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Altimetry and tide-gauge data are publicly available from http://www.aviso.altimetry.fr/en/data.html and http://uhslc.soest.hawaii.edu/thredds/uhslc_quality_daily. html?dataset=RQD033A (Caldwell et al, 2015). The authors are not supposed to redistribute these data.…”

Section: Data Availabilitymentioning

confidence: 99%

Coral mortality induced by the 2015–2016 El-Niño in Indonesia: the effect of rapid sea level fall

Ampou¹,

Johan²,

Menkès³

et al. 2016

Preprint

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Abstract. The 2015&#8211;2016 El-Ni&#241;o and related ocean warming has generated significant coral bleaching and mortality worldwide. In Indonesia, first signs of bleaching were reported in April 2016. However, this El Ni&#241;o has impacted Indonesian coral reefs since 2015 through a different process than temperature-induced bleaching. In September 2015, altimetry data shows that sea level was at its lowest in the past 12 years, affecting corals living in the bathymetric range exposed to unusual emersion. In March 2016, Bunaken Island (North Sulawesi) displayed up to 85&#8201;% mortality on reef flats dominated by Porites, Heliopora and Goniastrea corals with differential mortality rates by coral genus. Almost all reef flats showed evidence of mortality, representing 30&#8201;% of Bunaken reefs. For reef flat communities which were living at a depth close to the pre-El Ni&#241;o mean low sea level, the fall induced substantial mortality likely by higher daily aerial exposure a least during low tide periods. Altimetry data was used to map sea level fall throughout Indonesia, suggesting that similar mortality could be widespread for shallow reef flat communities, which accounts for a vast percent of the total extent of coral reefs in Indonesia. The altimetry historical records also suggest that such event was not unique in the past two decades, therefore rapid sea level fall could be more important in the dynamics and resilience of Indonesian reef flat communities than previously thought. The clear link between mortality and sea level fall also calls for a refinement of the hierarchy of El Ni&#241;o impacts and their consequences on coral reefs.

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Tidal corrections for TOPEX altimetry in the Coral Sea and Great Barrier Reef Lagoon: Comparisons with long‐term tide gauge records

Cited by 7 publications

References 46 publications

Tide model comparison over the Southwestern Atlantic Shelf

Tide model comparison over the Southwestern Atlantic Shelf

Coral mortality induced by the 2015–2016 El-Niño in Indonesia: the effect of rapid sea level fall

Coral mortality induced by the 2015–2016 El-Niño in Indonesia: the effect of rapid sea level fall

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