Can Continental Shelf River Plumes in the Northern and Southern Gulf of Mexico Promote Ecological Resilience in a Time of Climate Change?

Kemp, G. Paul; Day, John W.; Yáñez‐Arancibia, Alejandro; Peyronnin, Natalie

doi:10.3390/w8030083

Cited by 32 publications

(21 citation statements)

References 60 publications

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“…Two riverine systems account for 80% of the freshwater discharge into the GoM, the Mississippi/Atchafalaya system with 18,000 m 3 s −1 , and Usumacinta/Grijalva system with 4500 m 3 s −1 (Dunn, 1996;Yáñez Arancibia and Day, 2004;Kemp et al, 2016). Riverine contributions to water volume, salinity, temperature and DIN concentration are included as grid-cell sources into the model.…”

Section: Freshwater Sourcesmentioning

confidence: 99%

Budget of the total nitrogen in the Yucatan Shelf: driving mechanisms through a physical-biogeochemical coupled model

Estrada-Allis

Souza²,

Sheinbaum

et al. 2019

Preprint

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<p><strong>Abstract.</strong> Continental shelves are the most productive areas in the seas with strongest implications for global Total Nitrogen (TN) cycling. The Yucatan shelf is the largest shelf in the Gulf of Mexico (GoM), however, its general TN budget has not been quantified. This is largely due to the lack of significant spatio-temporal in situ measurements and the complexity of the shelf dynamics, including the Yucatan Current, coastal upwelling, Coastal Trapped Waves (CTWs) and bottom Ekman transport. Through a nine years output of a coupled physical-biogeochemical model of the GoM, the TN budget in the Yucatan shelf is quantified. Results indicate that the main entrance of inorganic nitrogen is through its southern and eastern margins. The TN is then advected to the oligotrophic deep GoM and to the deep Campeche bay. The analysis also shows that the inner shelf (50&#8201;m isobath) is efficient in terms of TN, since all the DIN imported into the shelf is consumed by the phytoplankton. Rivers contribute 20&#8201;% of the TN, while denitrification removes up to 53&#8201;% of TN that enters into the inner shelf. The high-frequency variability of the TN fluxes are modulated by the Yucatan Current in the south and by bottom Ekman transport produced by this current against the shelf-break (250&#8201;m isobath) in the east. This current-topography interaction can help to maintain the upwelling of Cape Catoche, uplifting nutrient-rich water into the euphotic layer. The export of TN at both western and northwestern margins is modulated by CTWs with a mean period of 10 days in agreement with recent observational and modelling studies.</p>

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Section: Freshwater Sourcesmentioning

confidence: 99%

Budget of the total nitrogen in the Yucatan Shelf: driving mechanisms through a physical-biogeochemical coupled model

Estrada-Allis

Souza²,

Sheinbaum

et al. 2019

Preprint

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“…These rivers originate from the northwestern Guatemala and Chiapas (Mexico), respectively, and join together just ~50 km upstream the coast of the Gulf of Mexico (Muñoz‐Salinas & Castillo, ). The Usumacinta and Grijalva Rivers form a single basin of ~112,550 km 2 that discharges annually ~2678 m 3 s −1 , with peak discharges from July to November and rank second in fresh water discharge to the Gulf of Mexico (Hudson et al, ; Kemp, Day, Yáñez‐Arancibia, & Peyronnin, ). When combined with the nearby Coatzacoalcos River that discharges to the southern Veracruz coast, fluvial input to the Veracruz to Campeche “fertile crescent” rises to 200 km 3 per year (Kemp et al, ).…”

Section: Study Areamentioning

confidence: 99%

“…The Usumacinta and Grijalva Rivers form a single basin of ~112,550 km 2 that discharges annually ~2678 m 3 s −1 , with peak discharges from July to November and rank second in fresh water discharge to the Gulf of Mexico (Hudson et al, ; Kemp, Day, Yáñez‐Arancibia, & Peyronnin, ). When combined with the nearby Coatzacoalcos River that discharges to the southern Veracruz coast, fluvial input to the Veracruz to Campeche “fertile crescent” rises to 200 km 3 per year (Kemp et al, ). Rivers run‐off in the southwestern Gulf produces a strong stratification of salinity and density that reaches 42 km offshore from the river mouth, affecting the top 15 m of the water column in autumn (Monreal‐Gomez, Salas de León, Padilla Pilotze, & Alatorre Mendieta, ; Salas de león et al, ; Salas‐de‐León et al, ).…”

Section: Study Areamentioning

confidence: 99%

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

et al. 2018

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The bulk sand samples and detrital zircons collected from the Atasta and Alvarado beach areas in the southwestern Gulf of Mexico have been analysed for geochemistry and U–Pb ages to constrain their provenance. The index of chemical maturity and SiO2/Al2O3 ratio of the Atasta and Alvarado beach sands indicated low compositional maturity. The chondrite‐normalized REE patterns and Eu anomalies of the Atasta and Alvarado beach sands suggested that the sands were derived from felsic and intermediate igneous rock types, respectively. A wide range in Th and U contents of the Atasta (~1.0–884 ppm and ~39–883 ppm, respectively) and Alvarado (~13–2,641 ppm and ~21–2,457 ppm, respectively) zircons likely indicates that the detrital zircon populations consist of zircons derived from multiple sources. The total rare earth element (ΣREE) content in the Atasta and Alvarado zircons ranges from ~151 to 2,088 ppm and ~154 to 3,580 ppm, respectively. The chondrite‐normalized REE patterns of zircons from the two beach areas show slightly depleted light REE (LREE) and enriched heavy REE (HREE), as well as positive Ce and negative Eu anomalies. A few zircons of Alvarado beach lack a Ce positive anomaly but exhibit a distinct Eu anomaly. The differences in REE patterns among zircons between the two beach areas revealed the variations in the type of source terranes, which supplied zircons to the beach areas. The detrital zircon age distribution for the Atasta beach is homogeneous, showing a prominent Proterozoic peak (~596–2,461 Ma; number of samples n = 62) with few Cenozoic (~10.43–65.2 Ma; n = 4) and Palaeozoic (~380–468 Ma; n = 5) zircons. The zircon U–Pb ages of Alvarado beach revealed Cenozoic (~0.25–63.9 Ma; n = 65), Mesozoic (~67.9–181.2 Ma), Palaeozoic (~252–297 Ma), and Proterozoic (~589–1,501 Ma) age clusters with predominant Cenozoic zircons. The comparison of zircon REE chemistry and geochronological data of this study with published data suggests that the source terranes, which supplied zircons to the Atasta beach, were the Chiapas Massif and Oaxacan complexes, whereas the zircons in the Alvarado beach were derived from the nearby Mexican Volcanic Belt and Eastern Alkaline Province. The provenance variation between the two beach areas was also revealed by the dissimilarities in zircon age clusters.

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“…Consequently, the relative potential for substantial, sustainable agriculture in the region is very low because of insuffi cient soil fertility and low water availability. In addition, people do not understand that lagoon-estuarine systems (Yáñez-Arancibia & Day, 2006) and deltaic systems (Carriquiry et al, 2011;Day et al, 2016b;Gerlak et al, 2013;Kemp et al, 2016;Yáñez-Arancibia et al, 2009) are other important freshwater users. These productive ecosystems are extremely important in arid regions because of low productivity of terrestrial ecosystems.…”

Section: Ecosystem Services At Severe Riskmentioning

confidence: 99%

“…This will lead to a decrease in ecosystem services from the southern Great Plains to the southwestern United States and northwestern México, where they are already low, and climate change will further reduce ecosystem services in those regions. The high levels of ecosystem services of coastal areas in these regions will be impacted by climate change due to sea-level rise, stronger storms, and decreased freshwater discharge (Day et al, 2011;Kemp et al, 2016;Yáñez-Arancibia et al, 2013;Yáñez-Arancibia, 2015).…”

Section: Environmental Sustainability For Economic Development: a Grementioning

confidence: 99%

Water scarcity and sustainability in the arid area of North America: Insights gained from a cross border perspective

Yáñez‐Arancibia¹,

Day

2017

Regions and Cohesion

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Can Continental Shelf River Plumes in the Northern and Southern Gulf of Mexico Promote Ecological Resilience in a Time of Climate Change?

Abstract: Deltas and estuaries built by the Mississippi/Atchafalaya

Cited by 32 publications

References 60 publications

Budget of the total nitrogen in the Yucatan Shelf: driving mechanisms through a physical-biogeochemical coupled model

Budget of the total nitrogen in the Yucatan Shelf: driving mechanisms through a physical-biogeochemical coupled model

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

Water scarcity and sustainability in the arid area of North America: Insights gained from a cross border perspective

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