Waves on Louisiana Continental Shelf Influenced by Atmospheric Fronts

Guo, Biyun; Subrahmanyam, M. V.; Li, C.

doi:10.1038/s41598-019-55578-w

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…As in previous studies over coastal Louisiana, waves influenced by atmospheric cold front are further discussed (e.g., [4,37]). Generally, due to the high sea-state during storms and the cost associated with any data collection activities, the in-situ measurements of waves, not to mention directional waves, are quite limited.…”

Section: Discussionmentioning

confidence: 80%

“…The Louisiana coastal area, including the lower Mississippi River deltaic plain, comprises 40% of the United States wetland [2,3]. On different short-and long-term (temporal) and west to east (spatial) scales, the wind characteristics along the Louisiana coast are very different [4]. A land-sea breeze effect is apparent along the Louisiana coast all year round and is especially pronounced in the summer.…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric Cold Front-Generated Waves in the Coastal Louisiana

Cao

2020

JMSE

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Atmospheric cold front-generated waves play an important role in the air–sea interaction and coastal water and sediment transports. In-situ observations from two offshore stations are used to investigate variations of directional waves in the coastal Louisiana. Hourly time series of significant wave height and peak wave period are examined for data from 2004, except for the summer time between May and August, when cold fronts are infrequent and weak. The intra-seasonal scale variations in the wavefield are significantly affected by the atmospheric cold frontal events. The wave fields and directional wave spectra induced by four selected cold front passages over the coastal Louisiana are discussed. It is found that significant wave height generated by cold fronts coming from the west change more quickly than that by other passing cold fronts. The peak wave direction rotates clockwise during the cold front events. The variability of the directional wave spectrum shows that the largest spectral density is distributed at low frequency in the postfrontal phase associated with migrating cyclones (MC storms) and arctic surges (AS storms).

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Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Atmospheric Cold Front-Generated Waves in the Coastal Louisiana

Cao

2020

JMSE

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“…The pre‐frontal phase characterized by southerly winds (Figure S6c in Supporting Information S1) anticipates the frontal passage where the wind direction quickly shifts to northerly winds in the post‐frontal phase (Figure S6c in Supporting Information S1) (Moeller et al., 1993). Previous research has shown that winter storms in coastal Louisiana and in particular cold fronts control the wave fields (Cao et al., 2020; Guo et al., 2020), water fluxes (Feng & Li, 2010), and sediment exchange (Dingler & Reiss, 1990; Perez et al., 2000; Roberts et al., 1989). Reed (1989), using sediment deposition measurements in Terrebonne Bay, suggested that cold fronts represent an ideal setting for sediment deposition.…”

Section: Discussionmentioning

confidence: 99%

Storm Impacts on Mineral Mass Accumulation Rates of Coastal Marshes

Cortese,

Zhang,

Simard

et al. 2024

JGR Earth Surface

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Coastal marsh survival may be compromised by sea‐level rise, limited sediment supply, and subsidence. Storms represent a fundamental forcing for sediment accumulation in starving marshes because they resuspend bottom material in channels and tidal flats and transport it to the marsh surface. However, it is unrealistic to simulate at high resolution all storms that occurred in the past decades to obtain reliable sediment accumulation rates. Similarly, it is difficult to cover all possible combinations of water levels and wind conditions in fictional scenarios. Thus, we developed a new method that derives long‐term deposition rates from short‐term deposition generated by a finite number of storms. Twelve storms with different intensity and frequency were selected in Terrebonne Bay, Louisiana, USA and simulated with the 2D Delft3D‐FLOW model coupled with the Simulating Waves Nearshore (SWAN) module. Storm impact was analyzed in terms of geomorphic work, namely the product of deposition and frequency. To derive the long‐term inorganic mass accumulation rates, the new method generates every possible combination of the 12 chosen storms and uses a linear model to fit modeled inorganic deposition with measured inorganic mass accumulation rates. The linear model with the best fit (highest R2) was used to derive a map of inorganic mass accumulation rates. Results show that a storm with 1.7 ± 1.6 years return period provides the largest geomorphic work, suggesting that the most impactful storms are those that balance intensity with frequency. Model results show higher accumulation rates in marshes facing open areas where waves can develop and resuspend sediments. This method has the advantage of considering only a few real scenarios and can be applied in any marsh‐bay system.

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“…Finally, physical disturbances, such as tropical storms and hurricanes may be infrequent, but nevertheless represent critical events in coastal areas (Halper and Schroeder 1990; Guo and Subrahmanyam 2020). In such situations, a dual analysis of DO and DIC dynamics can capture contrasting short‐ and long‐term productivity patterns in surface waters.…”

Section: Discussionmentioning

confidence: 99%

Divergent effects of biological and physical processes on dissolved oxygen and dissolved inorganic carbon dynamics on a eutrophied and hypoxic continental shelf

Quiñones‐Rivera

Wissel

Turner

et al. 2022

Limnology & Oceanography

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Dissolved oxygen (DO) and dissolved inorganic carbon (DIC) represent reciprocal sides of aquatic metabolism. In closed systems, absolute DO and DIC changes follow a $ 1 : 1 ratio, but in open systems coupling depends on mixing, air-sea gas exchange, and anaerobic respiration. To quantify DO-DIC controls in coastal waters, we evaluated their concentrations and stable isotopes together with water quality and physical conditions across the hypoxic zone off the Louisiana continental shelf in July 2002 and July 2003. This area is characterized by high yet variable productivity and strong seasonal changes in vertical stratification and river discharge. Prior to 2003, this area was impacted by two tropical systems that could impact vertical stratification and mixing with offshore waters. The relationship between DO and DIC displayed three patterns: (1) In bottom waters, DO and DIC showed similar (opposing) trends in concentrations and stable isotopes in both years, largely associated with nutrients and algal biomass. (2) In 2002, DO and DIC concentrations in surface waters followed similar spatial patterns (reflecting algal biomass, salinity, and nutrients). However, due to different atmospheric gas exchange, DIC depletion exceeded DO supersaturation sixfold. Accordingly, short-term (DO) and long-term productivity (DIC) were on the same trajectory. (3) In 2003, DO and DIC were decoupled in surface waters. High DO concentrations correlated with algal biomass (recent production) while DIC concentrations followed salinity (past production). Understanding challenges and opportunities of using DO and DIC individually or combined is critical for quantifying metabolic patterns and capturing impacts of natural variability and climate change on eutrophic continental shelfs.

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Waves on Louisiana Continental Shelf Influenced by Atmospheric Fronts

Cited by 8 publications

References 33 publications

Atmospheric Cold Front-Generated Waves in the Coastal Louisiana

Atmospheric Cold Front-Generated Waves in the Coastal Louisiana

Storm Impacts on Mineral Mass Accumulation Rates of Coastal Marshes

Divergent effects of biological and physical processes on dissolved oxygen and dissolved inorganic carbon dynamics on a eutrophied and hypoxic continental shelf

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