Using n-alkanes as a proxy to reconstruct sea-level changes in Thale Noi, the west coast of the Gulf of Thailand

Sainakum, Assuma; Jittangprasert, Piyada; Sompongchaiyakul, Penjai; Jirapinyakul, Akkaneewut

doi:10.1016/j.jseaes.2021.104740

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…The CPI values indicate the possible predominance of odd n-alkanes, even n-alkanes, or not predominance. CPI values near one suggest no preference among odd and even n-alkanes and are associated with petrogenic inputs or anthropogenic sources (Sainakum et al, 2021). In the present study, CPI values from water (0.63-1.72) and soft tissues (0.46-1.92, except Mecoacań) suggest a predominant petrogenic contribution for n-alkanes.…”

Section: Diagnostic Ratios Of N-alkanes and Pahscontrasting

confidence: 46%

“…In the present study, CPI values from water (0.63-1.72) and soft tissues (0.46-1.92, except Mecoacań) suggest a predominant petrogenic contribution for n-alkanes. In individuals from Carmen, the CPI value (1.92) suggests a contribution from mixed sources, with the predominance of biogenic sources, probably phytoplankton (El Nemr et al, 2016;Sainakum et al, 2021). In contrast, for individuals from Mecoacań, the high CPI value (3.21) suggests the presence of nalkanes from terrigenous sources (Leider et al, 2013), typically from C3 plants, important in the deposition of organic matter in estuaries (Lu et al, 2022).…”

Section: Diagnostic Ratios Of N-alkanes and Pahsmentioning

confidence: 99%

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Hydrocarbons occurrence and transcriptomic response of oyster Crassostrea virginica from lagoons of the Southern Gulf of Mexico

et al. 2023

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The Gulf of Mexico is an important crude oil reserve worldwide, and the oyster Crassostrea virginica is an excellent candidate to study the oil spill impacts on marine invertebrates. In this work, the concentrations of polycyclic aromatic hydrocarbons (PAHs) and aliphatic hydrocarbons (AHs) from eight productive oyster areas in the Gulf of Mexico were measured on sediment, water, and tissues from C. virginica. In water, the highest AHs concentration was detected in Tamiahua (0.50 ng/mL), while for PAHs, the highest concentration was > 0.10 ng/mL in Tampamachoco. In sediment, Tamiahua and Tampamachoco lagoons had the highest AHs concentrations with values near 2.5 μg/g dry weight. Considering the PAHs, Tamiahua, Carmen, and Tampamachoco lagoons registered the highest levels, with values > 60 ng/g dry weight. In tissues from C. virginica, La Pesca, Cármen and Mecoacán presented the highest PAHs concentrations with values between 0.20 and 0.25 μg/g dry weight. Furthermore, from the molecular analysis of genes related with different phases of the xenobiotic detoxification process such as hypoxia inducible factor (hif-1a), cytochrome P450 10 (cyp10), flavin mono-oxygenase (fmo), glutathione S-transferase (gstΩ1), multidrug resistant protein (mdrd1), catalase (cat), among others, the differences between lagoons were significant (P< 0.05) and generally with Las Enramadas showing the highest expression levels. From genes evaluated in this study, hif-1a, cyp10, fmo, mdrd1 and cat presented the highest expression differentials between lagoons. The above allowed us to validate the utility of molecular markers in the assessment of the hydrocarbons effect on oyster under the conditions from the Southern Gulf of Mexico.

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Section: Diagnostic Ratios Of N-alkanes and Pahscontrasting

confidence: 46%

Section: Diagnostic Ratios Of N-alkanes and Pahsmentioning

confidence: 99%

Hydrocarbons occurrence and transcriptomic response of oyster Crassostrea virginica from lagoons of the Southern Gulf of Mexico

et al. 2023

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“…The Holocene sea level fluctuations in Southeast Asia have been primarily attributed to hydro–isostasy, which is the adjustment of the Earth’s crust to changes in the volume of ice sheets and glaciers (Horton et al, 2005). However, the spatial variability of the magnitude of sea level fluctuations varies depending on the geographical location within the region (Chabangborn et al, 2020; Choowong et al, 2009; Jiwarungrueangkul et al, 2022; Oliver and Terry, 2019; Sainakum et al, 2021). For the Late-Holocene, the global sea level has been reported to decrease gradually, as simulated by the ICE–6E_C Glacial Isostatic Adjustment (GIA) model (Peltier et al, 2015), or show no evidence of fluctuation (Lambeck et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…These discrepancies could be attributed to the lack of understanding of the competing factors influencing the RSL changes in the region, resulting in the differences in the timing and magnitude of RSL fluctuations reported (e.g. Chabangborn et al, 2020; Choowong et al, 2009; Jiwarungrueangkul et al, 2022; Oliver and Terry, 2019; Sainakum et al, 2021; Surakiatchai et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

ENSO may have contributed to sea level changes in the Gulf of Thailand during the Late-Holocene

Jirapinyakul,

Nudnara,

Punwong

et al. 2023

The Holocene

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The Gulf of Thailand is ideal for studying eustatic sea level fluctuations in Southeast Asia due to its shallow basin and tectonic stability. However, our understanding of how this region’s relative sea level (RSL) has fluctuated over the Holocene epoch is far from complete. In this study, we used lithostratigraphy, loss on ignition, grain size, and pollen analyses to reconstruct the environmental changes in the Sam Roi Yot wetland, which was significantly influenced by seawater intrusion, driven by fluctuations in RSL in the Gulf of Thailand. Therefore, the analyzed pollen records of the sediment core from the wetland reflected variabilities in the RSL in the Gulf of Thailand. Subsequently, we found that after a sea level highstand prior to 4000 cal y BP, the RSL gradually fell with two significant regressions at c. 2950 and 1850–1450 cal y BP before rising at 1450–1050 cal y BP and declining after that. The inconsistency between RSL reconstruction based on our results and the global sea level changes simulated by the Glacial Isostatic Adjustment (GIA) model further suggests that long–term El Niño Southern Oscillations (ENSO) variabilities may have played a significant role in sea level changes in the Gulf of Thailand over the Late-Holocene period. Thus, during extended El Niño or La Niña conditions, the sea level would have been consistently lower or higher than expected from eustatic and isostatic processes alone. Overall, this study emphasizes the importance of considering regional factors such as ENSO to understand sea level changes in Southeast Asia.

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“…The sediment profile in the study sites is based on the sedimentary cores obtained from the Thale Noi. The lowermost layer was a stiff, light gray clay, correlated to a tidal flat environment, deposited by a sealevel rise before c. 8300 cal a BP (Wangritthikraikul et al, 2020;Sainakum et al, 2021). The stiff clay was overlaid by dark grey clay, which back mangrove pollen taxa generally found in this layer suggested a landward environmental shift owing to sea level fall at 8300-8100 cal a BP (Chabangborn et al, 2020).…”

Section: Geological Backgroundmentioning

confidence: 96%

Geophysical and chemical characteristics of peatland in coastal wetland, southern Thailand

Phiranram,

Chenrai,

Jirapinyakul

et al. 2024

Front. Mar. Sci.

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Peatlands, as an important carbon sink, store a large amount of atmospheric carbon that is vulnerable to becoming a carbon emission source due to the disturbance of the peat layer by natural and anthropogenic processes. The Kuan Kreng peat swamp forest is the second largest peatland in Thailand and is in coastal wetland serving for carbon stock in the subsurface. To assess carbon stock in peatland, the thickness and distribution of the peat layer are necessary. This study determines physical and chemical characteristics of the peatlands in the coastal wetland, southern Thailand by conventional core study and geophysical surveys, including ground penetrating radar (GPR) and electrical resistivity imaging (ERI). There is a significant relationship between chemical and physical properties from the peat layer, which is useful to approximately predict the physical properties and peat layers in the geophysical profiles. The resistivity profiles exhibit high resistivity response, peat between 21.9 and 145.0 ohm-m, interpreted as the peat layers in the shallow subsurface. The high resolution GPR profiles provide an average GPR velocity in peat of 0.040 m/ns and a relative dielectric constant of 54.9 for the peat layers. The peat layer is characterized by a high amplitude of reflection in the GPR profiles. The thickness of the peat layers was estimated from the geophysical surveys and the drilling cores having an average thickness of 18 cm. Average values of bulk density (0.19 g/cm3) and TOC (31.18 wt. %) from the drilling core samples are used to calculate the carbon density in the peat layers giving a result of 59.24 Kg C/m3. Hence, the carbon stock at the Kuan Kreng peat swamp forest is estimated at least 7.53 megaton carbon, which is much higher than aboveground biomass carbon in this area. The innumerably high amount of carbon stock could raise awareness of peatland disturbances.

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Using n-alkanes as a proxy to reconstruct sea-level changes in Thale Noi, the west coast of the Gulf of Thailand

Cited by 8 publications

References 31 publications

Hydrocarbons occurrence and transcriptomic response of oyster Crassostrea virginica from lagoons of the Southern Gulf of Mexico

Hydrocarbons occurrence and transcriptomic response of oyster Crassostrea virginica from lagoons of the Southern Gulf of Mexico

ENSO may have contributed to sea level changes in the Gulf of Thailand during the Late-Holocene

Geophysical and chemical characteristics of peatland in coastal wetland, southern Thailand

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