Wind-induced diurnal variability in river plume motion

Piñones, Andrea; Valle‐Levinson, Arnoldo; Narváez, Diego A.; Vargas, Cristian A.; Navarrete, Sergio A.; Yuras, Gabriel; Castilla, J. C.

doi:10.1016/j.ecss.2005.06.016

Cited by 64 publications

(35 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…data). For instance, the few available direct ocean velocity observations in the modelled region (Narváez et al 2004, Piñones et al 2005) are generally consistent with the simulated velocity field. The phase and extent of upwelling events were successfully predicted, as determined from comparisons of modelled and satellite sea surface temperatures at Las Cruces and upwelling centres.…”

Section: Methodsmentioning

confidence: 77%

“…Contributions due to large-scale, along-shore pressure gradients, coastally trapped waves, the meso-scale eddy field, river plumes and tidal bores (e.g. Piñones et al 2005, Narváez et al 2006) may each be significant in this region at various times and are not included in the model. In addition, we did not parameterise velocity variability at scales finer than the model resolution, such as turbulence, which has been shown to have important consequences for dispersal in other areas (e.g.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Along-shore larval dispersal kernels in a numerical ocean model of the central Chilean coast

Aiken¹,

Navarrete

Castillo³

et al. 2007

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Dispersal kernels provide a useful way to quantify the average spatial distribution of propagules originating from a given point in space. Consequently, dispersal kernels have been used in analytical and numerical studies of short-and long-distance dispersal of marine invertebrates and fish with pelagic larval stages. In most cases, the shape of dispersal kernels is pre-determined and parameterised with knowledge of larval duration or mean current velocities homogeneously across space. Here, the characteristics of planktonic larval dispersal for near-shore species in a realistic coastal ocean flow are investigated through the use of a numerical ocean model of a section of the central Chilean coast. The 3-dimensional primitive equation model was forced by 4 yr of observed winds from Las Cruces. Planktonic larval dispersal was simulated by advecting passive drifters using the evolving model velocity field. No a priori assumptions were made about diffusion-advection statistics. Drifters were released daily from regularly spaced locations along the coast and were considered to have settled if found within 1 km of the coast 30 d after release. Observed dispersal kernels were then calculated for each release location, and their variability in space and time was examined. This variability was found to be substantial over spatial scales less than a typical larval-advection scale, and, as a result, a spatially and temporally averaged dispersal kernel was inadequate as a global model of settlement. Large along-shore variation in the shape of dispersal kernels led to significant variation in the spatial pattern of connectivity among local sites, with some acting as net sources and some as net sinks within scales of 10s of kilometres. These results are linked to the alongshore and seasonal variability in ocean circulation, in particular close to shore. Both local and global dispersal kernels were found to be non-Gaussian, with their distribution related to that of the ocean velocity field. It is concluded that, in realistic flows with complicated coastal geometry, considerable departure from the expected Gaussian dispersal kernels based on homogeneous flow conditions can lead to complex spatial patterns of connectivity and successful settlement along a relatively simple but real coastline.

show abstract

Section: Methodsmentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Along-shore larval dispersal kernels in a numerical ocean model of the central Chilean coast

Aiken¹,

Navarrete

Castillo³

et al. 2007

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…Intertidal fishes generally have benthic or demersal eggs (Balbontín & Pérez 1979, Pérez 1981 and its larvae are highly abundant in very nearshore areas (Hernández-Miranda et al 2003, Miranda Azeiteiro et al 2006, Borges et al 2007b. During winter off central Chile there is an increase of the freshwater input and rainfall in the coast (Faundez-Baez et al 2001), reducing the surface salinity and increasing the extension of river plumes over the shelf (Piñones et al 2005); by this mechanism intertidal larval fishes may be advected through the inner shelf and may explain the presence of larval blennies (Hypsoblennius sordidus), kyphosids, labrisomids and sciaenids in the shelf station.…”

Section: Discussionmentioning

confidence: 99%

Larval fish assemblages off central Chile upwelling ecosystem

Landaeta

Veas²,

Letelier³

et al. 2008

Rev. biol. mar. oceanogr.

View full text Add to dashboard Cite

“…The lack of correlation indicated that smaller relaxation events do not necessarily result in consistent settlement onshore, at least during the period of this study. Therefore, other mechanisms such as internal tidal bores (Vargas et al 2004) and seabreeze-driven river plumes and plume fronts , Piñones et al 2005 could play a role in larval transport to the shoreline.…”

Section: Settlement and Upwelling Relaxationmentioning

confidence: 99%

Onshore advection of warm water, larval invertebrate settlement, and relaxation of upwelling off central Chile

Narváez¹,

Navarrete²,

Largier³

et al. 2006

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Observations from several places around the world suggest that periods of relaxation of winds tha drive upwelling favor the onshore transport of larvae entrained in shoreward movement of warm surface waters. However, the generality of this process has not yet been appropriately evaluated. We examined the frequency, intensity, spatial extent, and inter-annual variability of sea surface temperature fluctuations associated with the relaxation of equator-ward winds and their influence on invertebrate settlement in central Chile (33°30' S, 71°40' W). Our results showed that there were marked differences in the intensity and structure of temperature increases following the relaxation of upwelling favorable winds. While most temperature increases were small (0.5 to 1°C) and preserved the stratification of the water column, large 'warming events' (> 3°C) led to a breakdown of stratification for periods of 3 to 9 d at least twice during each spring-summer season. These large warming events occurred in association with downwelling-favorable (northerly) winds, and their formation might have required certain conditions in terms of mesoscale eddy features and local topography. Settlement of invertebrates occurred during these events as well at other times, and was not quantitatively correlated with relaxation or downwelling conditions. However, during specific large warming events, we observed significant synchrony in the settlement of several marine invertebrate taxa (e.g. decapods, gastropods, polychaetes, mussels, and sea urchins). Thus, at this site in central Chile and during our period of study, relaxation events did not dominate settlement, and it appeared that the upwelling-relaxation model did not adequately represent the larval transport mechanism for any taxa examined. However, large warming events (which produced synchrony in the settlement of several different taxa) could be important in that they may result in uniform settlement along the shore and deliver larvae from distant origins, increasing long-distance demographic and genetic connectivity. Thus, these infrequent events are likely to be a critical factor in settlement distribution along the shore.

show abstract

Wind-induced diurnal variability in river plume motion

Cited by 64 publications

References 27 publications

Along-shore larval dispersal kernels in a numerical ocean model of the central Chilean coast

Along-shore larval dispersal kernels in a numerical ocean model of the central Chilean coast

Larval fish assemblages off central Chile upwelling ecosystem

Onshore advection of warm water, larval invertebrate settlement, and relaxation of upwelling off central Chile

Contact Info

Product

Resources

About