the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Lagoon hydrodynamics of pearl farming atolls: the case of Raroia, Takapoto, Apataki and Takaroa (French Polynesia)
Oriane Bruyère
Romain Le Gendre
Mathilde Chauveau
Bertrand Bourgeois
David Varillon
John Butscher
Thomas Trophime
Yann Follin
Jerome Aucan
Vetea Liao
Serge Andréfouët
Abstract. Between 2018 and 2022, four pearl farming Tuamotu atolls of French Polynesia were monitored with autonomous oceanographic instruments to measure the hydrodynamics of atoll lagoons and the ocean-lagoon water exchanges. These surveys were conducted in the frame of ANR MANA (Management of Atolls) project and its extensions to additional sites. The overarching goal was to improve knowledge on the processes influencing the spat collection of the pearl oyster Pinctada margaritifera, the oyster species used to produce black pearls. These data sets are also critical for the calibration and validation of 3D high spatial resolution hydrodynamic models used to study the oyster larval dispersal within lagoons. The observational strategies focused on the characterization of ocean/lagoon exchanges through passes and hoa (i.e., shallow reef flats), lagoon circulation, incident waves breaking on the forereef, water elevation inside lagoon as well as spatial temperature variability. Chronologically, the investigated atolls were first Raroia Atoll with 9 months measurements between May 2018 and March 2019 during which the MALIS1 and MALIS2 cruises on-board the R/V ALIS took place. It was followed by a 4-month deployment in Takapoto Atoll (November 2021 to March 2022). In late April 2022, Apataki Atoll was instrumented until end of July, followed by Takaroa measurements between July to October. Apataki (Leg2) and Takaroa Atoll were conjointly instrumented during the MALIS 3 oceanographic cruise. Altogether, those multi-atoll data bring a worldwide unique oceanographic atoll data set, useful to address local pearl farming questions but potentially beneficial for other fundamental and applied investigations. Each data set was post processed, quality controlled and converted in NetCDF format. Files are available in open source into dedicated repositories in the SEANOE marine data platform with permanent DOIs.
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Oriane Bruyère et al.
Status: open (until 22 Oct 2023)
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RC1: 'Comment on essd-2023-198', Anonymous Referee #1, 14 Jul 2023
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Please find attached my comments
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RC2: 'Comment on essd-2023-198', Anonymous Referee #2, 20 Sep 2023
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General comments
The manuscript presents a valuable hydrodynamic data collection in four atolls at the Tuamotu Archipelago (French Polynesia). This data has the potential to be used in a variety of studies, and to be very useful for the local pearl farms as mentioned by the authors.
In my opinion, the study meets the ESSD standards for data availability. The general concepts/main ideas of the manuscript are intelligible, however, for publication, it would benefit from an English revision.
Figures are very good, but there are some imprecisions that should be also revised.
Specific comments
Line 50: “… found in the lagoon of Gambier.” I suggest deleting this part to clarify the sentence.
Line 55-56: “Black pearl farming is the second source of French Polynesia income after tourism. In 2021, it represented a 40million € value in exports.” Please add a reference.
Line 56: “… major activity after nearly 60 years of trials and pioneer work”. 60 years? Is that correct?
Line 61-66: “Four islands and atolls (Gambier, Marutea Sud, Ahe, and Arutua) represent half of the concessions but many atolls contribute to the activity (such as Apataki, Takapoto, Takaroa, Katiu, Kauehi, Raroia, etc.), although there are ups and downs. For instance, Takaroa atoll lagoon suffered a major dystrophy event in 2014 (Rodier et al., 2019), resulting in a mass mortality of oysters and spats. Since then, the activity is moribund in this lagoon, and has not yet revived as in 2023.” Please revise the English to clarify the information.
Line 80: Figure 1. I suggest changing the image order (top left the globe, top right the location of the archipelagos, and at the bottom the larger map) and also adding letters (a, b, and c) to identify each image. In my opinion, it is more intuitive to go from a general overview to something more detailed.
Line 145-149: The sentence is too long. Please revise.
Line 168-170: Figure 3 “Gambier Islands are another site studied from mid-2019 to February 2020. It is a group of high islands and data will be presented elsewhere because the sampling strategy obey to different criteria than atolls.” - If it is not used, why has it been included in the article?
Line 174-176: Please revise the sentence.
Sections 3.1, 3.2, 3.3, and 3.4: Please add some references for the information presented.
Line 387-389: The SBE56 were moored at 2 and 40 m depth or were moored between 2 and 40 m depth? Please clarify.
Line 473: “Ferret” Please add some information (e.g. website) about the ferret software.
Line 485: I suggest "Figure 9A illustrates water temperature time series for O1 and L5 stations". However, which atoll are these stations located on? Raroia Atoll?
Line 485-486: I suggest “Figure 9B shows the surface – bottom water temperature differences for L4, L5, and L6 stations at Raroia Atoll (Figure 4).”
Line 487-488: I suggest replacing this sentence with something simpler: “This example shows the passage from the cold to the warm season (approximately 26 °C in August-September to 30 °C in April).”
Line 489-491: “The sampling period shows that the variations are not continuously linear, with different rates of changes (between Leg 2 and Leg 3 for instance) and with episodes of trend inversion (as in mid-November 2018) (Figure 9A).” Please clarify.
Line 538-539: “Wave parameters post-processed from pressure data measured by RBRduet T.D sensors deployed in Apataki Atoll are shown Figure 11.” Figure 11 show the O01 and O03 stations, which are presented at Takapoto Atoll (Figure 5) not Apataki Atoll (Figure 6). Please check.
Line 543-544: “Water elevation measured inside the lagoon (station L05) …” Figure 11 B and C show station L02. Please rectify.
Line 550: Figure 11. Plots B and C should be swapped.
Line 560: “… and for the calibration and validation of hydrodynamic models” instead of “hydrodynamics models cal/val”.
Line 564-566: “Another pearl farming site (Gambier) was not included here and will be presented in a separate publication as it was a lagoon with several high islands and the sampling strategy was different.” If it is not included, why mention it in the article?
Technical corrections
General comment: numbers and units must be separated with a space.
Line 45: study or paper instead of report
Line 48-49: “… spread on a vast Exclusive Economic Zone (EEZ) with 4.8 million km2 …” instead of “… spread on a vast 4.8 million km2 Exclusive Economic Zone (EEZ) …”
Line 52: “… surrounding the lagoon” instead of “… which surrounds a lagoon”.
Line 54: “Currently, only 20 are active or operational.” instead of “… although only about 20 are currently active as in 2023.”
Line 57: “… due to …” instead of “… thanks to …”
Line 61: “… attributed or assigned …” instead of “… devoted …”
Line 88, 89, 92, 93: “Ahe atoll”
Line 89: “in situ” in italic.
Line 92: “Takaroa atoll”
Line 105: “… cruises in Raroia Atoll in 2018 (https://doi.org/10.17600/18000582) and one cruise targeting in particular the Apataki and Takaroa Atolls in 2022 (https://doi.org/10.17600/18001644).” instead of “cruises in Raroia Atoll in 2018 and one cruise targeting in particular the Apataki and Takaroa Atolls in 2022 (respectively, https://doi.org/10.17600/18000582 and https://doi.org/10.17600/18001644).”
Line 110: In my opinion, Figure 1 instead of Figure 2.
Line 156: Please add Atolls, similar to line 157.
Line 170: Table 1 should be placed before Figure 3.
Line 350: “… but the data collected was limited” instead of “… but limited data could be collected”.
Line 360: “2 Oceanographic instruments” It is Section 4, not 2.
Line 393: “Acoustic Doppler Current Profiler (ADCP)” instead of “ADCPs (Acoustic Doppler Current Profiler)”
Line 446: “Differential Global Positioning System (DGPS)” instead of “DGPS (Differential Global Positioning System)”
Line 484: “Water temperature records”
Line 489: “°C” instead of “degrees”.
Line 494: “°C” instead of “degree”.
Line 519: “current intensities (m s-1) and directions (°N)”. Please, also add this to Figure 10.
Line 520: “… the Takaroa pass (P01 in Figure 7)”
Line 520. “The ADCP was moored at 17 m depth (Table A1)”
Line 541: “(mid-July 2022).”
Citation: https://doi.org/10.5194/essd-2023-198-RC2
Oriane Bruyère et al.
Data sets
Raroia Serge Andrefouet, Oriane Bruyère, Jérôme Aucan, Vetea Liao, and Romain Le Gendre https://doi.org/10.17882/94147
Takapoto Oriane Bruyère, Romain Le Gendre, Vetea Liao, and Serge Andrefouet https://doi.org/10.17882/94032
Apataki Oriane Bruyère, Romain Le Gendre, Vetea Liao, and Serge Andrefouet https://doi.org/10.17882/94031
Takaroa Oriane Bruyère, Romain Le Gendre, Vetea Liao, and Serge Andrefouet https://doi.org/10.17882/94146
Oriane Bruyère et al.
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