Covariation of coastal water temperature and microbial pollution at interannual to tidal periods

Boehm, Alexandria B.; Lluch‐Cota, Daniel B.; Davis, Kristen A.; Winant, Clinton D.; Monismith, Stephen G.

doi:10.1029/2003gl019122

Cited by 24 publications

(24 citation statements)

References 16 publications

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“…Assuming that the positive correlations in 2006 are indicative of cross-shore transport of FIB, these results provide one possible explanation for previous reports of a negative relationship between FIB and nearshore water temperature (Boehm et al, 2004a). Shoreline FIB concentrations were lower in 2005 than in 2006 (Santoro and Boehm, 2007); it is possible that low levels precluded identification of relationships between variables.…”

Section: Discussionmentioning

confidence: 35%

“…The 3-day low-passed near bottom temperature at A and HP (T) showed several long-period cooling events in 10-20 m deep water that lasted for multiple days to weeks (Figs. 4a,5a (Hamilton et al, 2006) and remotely forced nearshore upwelling (Pringle and Riser, 2003;Boehm et al, 2004a), this study does not attempt to examine the observed low-frequency temperature variation and concentrates on the temperature variation and transport at frequencies higher than tidal periods. An expanded view of temperature at A in August 2005 shows that on shorter time scales, the temperature at A was characterized by fluctuations at semi-diurnal and higher frequencies (Fig.…”

Section: Temperature Structurementioning

confidence: 99%

“…1) (http://www.ndbc.noaa.gov/ station_page.php?station=46025). It is the closest location of offshore wind data available and has been used in previous studies at Huntington Beach (e.g., Boehm et al, 2004a).…”

Section: Data Sourcesmentioning

confidence: 99%

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Coupled physical, chemical, and microbiological measurements suggest a connection between internal waves and surf zone water quality in the Southern California Bight

Wong

Santoro

Nidzieko

et al. 2012

Continental Shelf Research

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Internal waves have been implicated in the cross-shore transport of scalars such as larvae, nutrients, and pollutants at locations around the world. The present study combines physical measurements with a comprehensive set of surf zone water quality measurements to evaluate the possible impact of cross-shore internal wave transport on surf zone water quality during two study periods. An array of oceanographic moorings was deployed in the summer of 2005 and 2006 at 10-20 m depth offshore of the beach to observe internal waves. Concurrently, surf zone water quality was assessed twice daily at night at an adjacent station (Huntington State Beach) by measuring concentration of phosphate, dissolved inorganic nitrogen (DIN), silicate, chlorophyll a, fecal indicator bacteria (FIB), and the human-specific fecal DNA marker in Bacteroidales. The baroclinic component accounted for about 30% of the total variance in water column velocity, indicating the importance of density-driven flow during the summer when the water column was stratified. Arrival of cold subthermocline water in the very nearshore (within 1 km of the surf zone) was characterized by strong baroclinic onshore flow near the bottom of the water column. The near bottom, baroclinic, cross-shore current was significantly lag-correlated with the near bottom temperature data along a cross-shore transect towards shore, demonstrating shoreward transport of cold subthermocline water. Wavelet analysis of temperature data showed that non-stationary temperature fluctuations were correlated with buoyancy frequency and the near bottom cross-shore baroclinic current. During periods of large temperature fluctuations, the majority of the variance was within the semi-diurnal band; however, the diurnal and high frequency bands also contained a substantial fraction of total variance. The bottom cross-shore baroclinic current was proposed as a proxy for shoreward transport potential by internal waves and was positively correlated with phosphate concentration in both years, silicate in 2005, and fecal indicator bacteria measurements in 2006. The results suggest internal waves are an important transport mechanism of nutrient-rich subthermocline water to the very nearshore in the Southern California Bight, and may facilitate the transport of FIB into the surf zone or enhance persistence of land-derived FIB.

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Section: Discussionmentioning

confidence: 35%

Section: Temperature Structurementioning

confidence: 99%

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Coupled physical, chemical, and microbiological measurements suggest a connection between internal waves and surf zone water quality in the Southern California Bight

Wong

Santoro

Nidzieko

et al. 2012

Continental Shelf Research

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“…We included lagged time series of rainfall and storm runoff as well, because CA beach managers advise beachgoers that beach water quality is impaired by stormwater runoff for 3 days after a storm event. These factors were chosen for inclusion in our study because previous work showed that they can affect FIB densities at beaches (14,(24)(25)(26). Our SI contains information on the data and their sources.…”

Section: Methodsmentioning

confidence: 99%

Enterococci Predictions from Partial Least Squares Regression Models in Conjunction with a Single-Sample Standard Improve the Efficacy of Beach Management Advisories

Hou

Rabinovici

Boehm

2006

Environ. Sci. Technol.

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Beach health advisories are issued if enterococci (ENT) densities exceed the 30-d geometric mean or singlesample water quality criteria. Current ENT enumeration procedures require 1 day of incubation; therefore, beach managers make policy decisions using 1-day-old data. This is tantamount to using a model that assumes ENT density on day t is equal to ENT density on day t -1. Research has shown that ENT densities vary over time scales shorter than a day, calling into question the usefulness of the current model for decision-making. We created Dynamic Partial Least Square Regression (DPLSR) models for ENT at water quality monitoring stations within two adjacent marine recreational sites, Huntington State Beach (HSB) and Huntington City (HCB) Beach, California, using publicly available environmental data and tested whether these models overcome the drawbacks of the current model. The DPLSR models provide a better prediction of ENT than the current models based on comparisons of rootmean-square errors of prediction and the numbers of type 1 and 2 errors. We compared outcomes in terms of predicted illness, swimmers deterred from entering the water, and net benefits to swimmers for hypothetical management scenarios where beach advisories were issued based on (a) the previously collected sample's ENT density in conjunction with the two water quality criteria, and (b) predictions from DPLSR models in conjunction with the singlesample standard. At both HSB and HCB the DPLSR scenario produced a more favorable balance between illness prevention and recreational access. The results call into question the current method of beach management and show that model-informed decision-making and elimination of the geometric mean standard will aid beach managers in achieving more favorable outcomes in terms of illness and access than are presently achieved using 1-day-old measurements, especially at beaches where water quality problems are chronic.

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“…On the other hand, the concentrations of coliforms and heterotrophic bacteria, as well as the prokaryotic secondary production, were highest during the summer months, a season associated with touristic activities increasing local population. Coliforms were also present in the other samples, showing the role of global-scale actions on local-scale pollution, represented by basin scale oscillations, as well as oceanographic and atmospheric processes (Boehm et al 2004). For instance, the role of topography in water circulation explained the presence of fecal indicator bacteria at seaward stations of Senegal coastal waters (Bouvy et al 2008).…”

Section: Anthropogenic Pressurementioning

confidence: 90%

Bacterial and Archaeal Communities Variability Associated with Upwelling and Anthropogenic Pressures in the Protection Area of Arraial do Cabo (Cabo Frio region - RJ)

Coelho-Souza

Araújo

Cury

et al. 2015

An. Acad. Bras. Ciênc.

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Upwelling systems contain a high diversity of pelagic microorganisms and their composition and activity are defined by factors like temperature and nutrient concentration. Denaturing gradient gel electrophoresis (DGGE) technique was used to verify the spatial and temporal genetic variability of Bacteria and Archaea in two stations of the Arraial do Cabo coastal region, one under upwelling pressure and another under anthropogenic pressure. In addition, biotic and abiotic variables were measured in surface and deep waters from three other stations between these stations. Six samplings were done during a year and adequately represented the degrees of upwelling and anthropogenic pressures to the system. Principal Component Analysis (PCA) showed negative correlations between the concentrations of ammonia and phosphorous with prokaryotic secondary production and the total heterotrophic bacteria. PCA also showed negative correlation between temperature and the abundance of prokaryotic cells. Bacterial and archaeal compositions were changeable as were the oceanographic conditions, and upwelling had a regional pressure while anthropogenic pressure was punctual. We suggest that the measurement of prokaryotic secondary production was associated with both Bacteria and Archaea activities, and that substrate availability and temperature determine nutrients cycling.

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Covariation of coastal water temperature and microbial pollution at interannual to tidal periods

Cited by 24 publications

References 16 publications

Coupled physical, chemical, and microbiological measurements suggest a connection between internal waves and surf zone water quality in the Southern California Bight

Coupled physical, chemical, and microbiological measurements suggest a connection between internal waves and surf zone water quality in the Southern California Bight

Enterococci Predictions from Partial Least Squares Regression Models in Conjunction with a Single-Sample Standard Improve the Efficacy of Beach Management Advisories

Bacterial and Archaeal Communities Variability Associated with Upwelling and Anthropogenic Pressures in the Protection Area of Arraial do Cabo (Cabo Frio region - RJ)

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