BUSCADOR RECOLECTA

Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG, Because of the difficulties in tracking a water mass over time and conducting synoptic surveys over large spatial scales, measurements of biological variables in the ocean are often restricted to isolated Eulerian observations. Here a proof-of-concept of a pseudo-Lagrangian transformation was applied to a time series of chlorophyll-a profiles acquired at a single fixed station to diagnose the shape of a phytoplankton patch, and its physical-biological rates of transformation. During August 2013, a 27-hr time series of observations of horizontal currents, hydrographic properties, turbulent mixing and chlorophyll-a was acquired at a central station of the Ría de Vigo (NW Iberian Peninsula). A chlorophyll-a patch, tilted upward toward the inner part of the Ría, was observed moving back and forth past the sampling station. Its shape and position during the sampling period were modulated by the semi-diurnal (M2) tidal currents and the vertically sheared upwelling circulation. The pseudo-Lagrangian transformation allowed estimation of chlorophyll-a net rates of change. These rates were positive between 12 and 14 m depth, and negative elsewhere, with a mean value of −0.001 ± 0.449 days−1 within the patch maximum. After accounting for the effects of diffusion and sinking, the mean net biological production rate in the upper 15 m (0.53 ± 0.25 days−1) was comparable with in vitro estimates of the balance between phytoplankton growth and mortality obtained from dilution experiments carried out under similar conditions (0.2 ± 0.7 days−1). This pseudo-Lagrangian transformation is complementary to traditional analyses for the quantification of ecological processes and biogeochemical budgets., Ministerio de Economía y Competitividad | Ref. CTM2012-35155, Ministerio de Economía, Industria y Competitividad | Ref. CTM2016-75451- C2-1-R, Ministerio de Educación, Cultura y Deporte | Ref. FPU014/05385

This item is made of 2 files, of which 1 is the dataset in netcdf format and the other (Readme .txt) include a small description of the computed variables.-- Dataset contributed to the Project STRAMIX (STRAtification and MIXing in a coastal upwelling driven estuary, CTM2012-35155).-- Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0). The STRAMIX team appreciates that users of these data: 1) Contact Miguel Gil Coto (mgilcoto@iim.csic.es) or Nicolás Villacieros (nvrobineau@iim.csic.es) to follow the uses of the data, and 2) Include the requested acknowledgment (cite using the DOI of this dataset and please also cite Gilcoto et al. 2017) in any presentations or publications, Average directional wave spectrum from 28118 wave spectra obtained from ADCP currents between june 2013 and August 2014 in the Ría de Vigo (NW Iberia, Atlantic Ocean), STRAMIX project. Waves Monitor Software (RDI) was used to obtain the 28118 individual wave spectra. Criteria applied to compute parameters were: 20 minutes bursts with tilt and current correction every 10 minutes, maximum wave period of 28.6 s, sea-swell transition period of 7.3 s, 256 frequency bands, and 180 angles, Funding for this study was provided by the Spanish Ministry of Economy and Competitiveness under the STRAMIX (CTM2012-35155) research project, No

VI Expanding Ocean Frontiers conference (EOF 2021), Barcelona (Spain), 5th - 7th July 2021, This study provides new insights into the wave regime and wave-current coupling in a partially sheltered upwelling-driven coastal system, the Ría de Vigo (NW Iberia), and its adjacent continental shelf using data from ADCP, wave-gauge, met-ocean buoy and models results. The wave propagation from the shelf to the ria is considered during both downwelling (autumn-winter) and upwelling (spring-summer) seasons from June 2013 to August 2014. Swell on the NW Iberian shelf comes mainly from NW directions, while wind sea comes from the NW under upwelling conditions, and from the SW under downwelling conditions. As the bay is protected from the NW and exposed to the SW, swell is almost always attenuated and wave height inside the ria depends mostly on shelf wind sea variability. During the upwelling season, both swell and wind sea barely enter the ria and wave heights inside the ria are small (0.21 m). During the downwelling season, shelf wind sea directly enters the ria, contributing more to the total wave height, which achieves its maximum values (0.46 m). There is a wave-current coupling (WCC) between waves and wind-driven currents inside the ria that is stronger in the downwelling season. This strong WCC entails an increase in energy near the sea bed that reinforces benthic re-
mineralization, produces changes in the physiology of benthic organisms and has potential effects on other essential ecosystem services and human activities. The winter inter-annual variability (2009-2016) of wave height and WCC in the ria is analyzed through its relationship with the main climatic modes of the NW Iberian area. The winter wave height and WCC in the ria are controlled by the combination of the North Atlantic Oscillation (NAO) and the West Europe Pressure Anomaly (WEPA) indices. The highest waves, strongest residual currents, and consequently increased effects of WCC occur during the coincidence of negative NAO and positive WEPA phases, N. Villacieros-Robineau and P. C. Pardo were funded by the Juan de la Cierva-Formación postdoctoral fellowship (FJCI‐2017–34290) and a Personal Técnico de Apoyo grant (PTA2019-017492-I), respectively. Funding for this study was provided by “STRAMIX” (CTM2012-35155), “Radar On Raia” (0461_RADAR_ON_RAIA_1_E), and “STRAUSS” (PID2019-106008RB-C21) projects, No

VI Expanding Ocean Frontiers conference (EOF 2021), Barcelona (Spain), 5th - 7th July 2021, he Ría de Vigo is a semi-enclosed bay in which tidal residual currents are associated with coastal upwelling events. Both upwelling and downwelling favourable winds generate a bidirectional exchange flow with the shelf – a two-layer circulation with surface waters leaving (entering) the ria and a compensating inflow (outflow) through the bottom layer under upwelling (downwelling) conditions. This vertical circulation changes the vertical density structure inside the ria. In the ria, the tide is mainly semidiurnal (M2, S2 and K2), with some energy in the diurnal band (K1). Our velocity observations show that the vertical structure of the tidal currents in the ria do not exhibit a classic barotropic profile with a bottom boundary layer beneath uniform “free-stream” flow as the tidal bottom boundary layer is affected by stratification. This links tidal circulation to the wind-driven residual circulation, since the latter also greatly helps to control the stratification. We quantify this effect by fitting tidal ellipses to observed velocities through the water column. In addition to this indirect coupling through stratification, there is a direct interaction in which velocities in the upper and bottom layers are best correlated with winds while the mid-water velocities are best correlated with tides. These wind-tide interactions are expected to play a key role in the resuspension and transport of nutrients and phytoplankton in the Ria, Funding for the fieldwork, analysis, interpretation of the dataset was provided by STRAMIX research project (Spanish Ministry of Economy and Competitiveness, CTM2012-35155), No

This item is made of 3 files: the dataset in netcdf format, a Readme.txt file including a small description of the computed variables, and two figures (cartesian and polar format) representing the mean spectrum.-- Dataset contributed to the Project STRAMIX (CTM2012-35155), 28118 Directional wave spectra obtained from ADCP currents between June 2013 and August 2014 in the Ría de Vigo (NW Iberia, Atlantic Ocean), STRAMIX project. First, last and mean spectra were included separately. Waves Monitor Software (RDI) was used to obtain the 28118 individual wave spectra. Criteria applied to compute parameters were: 20 minutes bursts with tilt and current correction every 10 minutes, maximum wave period of 28.6 s, sea-swell transition period of 7.3 s, 256 frequency bands, and 180 angles, Funding for this study was provided by the Spanish Ministry of Economy and Competitiveness under the STRAMIX (CTM2012-35155) research project. Another project contributing to the processing of this dataset was the Spanish Ministry of Science and Innovation project “STRAUSS” (PID2019-106008RB-C21). N.Villacieros-Robineau was funded by the Spanish Ministry of Science and Innovation through a Juan de la Cierva-Formación postdoctoral fellowship (FJCI‐2017–34290), No

Poster.-- VIII International Symposium on Marine Science, Las Palmas de Gran Canaria, 6-8 July 2022, Subtidal natural beds of Polititapes rhomboides in the Ría de Vigo (NW Iberia) suffered massive mortality events in June 2010 (Darriba et al., 2019). Abnormal high-intensity infections of intracellular prokaryotic colonies (Rickettsiales-like) in the gills observed in the histopathological study could explain the clam’s mortality and the drop in this wild population. An atypical long period (7 months) of continuous and strong wave storms entailed high bottom boundary layer dynamics with intense sediment mobilization and resuspension. Immediately after this energetic period, warm water (17ºC) conditions near the seabed prevailed, and these could promote prokaryote colonies proliferation. Stress produced by the continuous wave impact on the seabed could have weakened the clam’s
ecophysiology inhibiting an efficient immune response. This physiological status would coincide with the expansion and infection of Rickettsial colonies in the gills, probably boosted by the warmer temperatures. This synergetic effect would have produced massive clam mortality events.
The analysis of wave climate winter variability shows an evident interannual variability related to the NAO (North Atlantic Oscillation) and WEPA (West Europe Pressure Anomaly) climate indices (Villacieros-Robineau et al., 2021). Winters with the highest waves occur during the coincidence of negative NAO and positive WEPA phases. Warmer temperatures and low salinity conditions (downwelling scenarios) are more frequent during these severe winters. Collapses of banded carpet shell populations, with a critical reduction in the abundance and a production decline, occurred after these energetic winters (2000/2001, 2009/2010). During intermediate recovery periods (years with low
energy conditions, e.g., 2006-2009), clam populations grow until the subsequent collapse.
This multidisciplinary approach, including histopathological, oceanographic, and population ecology studies, shows that monitoring environmental stressors related to the climate indices can be used as an ecological indicator of the clam’s health population status and evolution with potential applications for managing this and other marine resources, N. Villacieros-Robineau was funded by Juan de la Cierva-Formación fellowship (FJCI‐2017–34290 funded by MCIN/AEI/10.13039/501100011033). Projects: Acción de Investigación PROAMRUBIA (CIMA 19/04, Xunta de Galicia), STRAMIX (CTM2012-35155) and STRAUSS (PID2019-106008RB-C21) funded by MCIN/AEI/10.13039/501100011033, No

Poster.-- Conferencia sobre los Sistemas de Afloramiento de Borde Oriental (EBUS): Pasado, Presente y Futuro & Segunda Conferencia Internacional sobre el Sistema de Corrientes de Humboldt, 19-23 de Septiembre de 2022, Lima, Perú, The wave regime in the NW Iberia coastal upwelling system is closely related to the seasonal wind regime (Villacieros-Robineau et al., 2019 and 2021). Under upwelling conditions (prevailing northerly winds, spring-summer), swell and wind sea come mainly from NW directions. When southerly winds prevail (downwelling conditions, autumn-winter), swell comes from WNW, and wind sea comes from SW directions. The coastal bays or rias of this region, mainly protected from the NW and exposed to the SW, are more vulnerable to the change in the shelf wave direction than the open coast. The wave regime on the shelf and in one of these bays, the Ría de Vigo, was studied between June 2013 and August 2014, using data from an Acoustic Doppler Current Profiler (ADCP), a wave-gauge, a met-ocean buoy, and model results. Our results indicate that swell is almost always attenuated when entering the bay, and wave height inside the ria depends mostly on shelf wind sea variability. During the upwelling season, both swell and wind sea barely enter the ria, and wave heights inside the ria are small (0.21 m). During the downwelling season, shelf wind sea directly enters the ria, contributing more to the total wave height, which achieves its maximum values (0.46 m). There is a cumulative action of wave and wind-driven currents (wave-current coupling, WCC) that is strongest during the downwelling season. The WCC entails an increase in the seabed energy, which could reinforce bottom remineralization, produce changes in the ecophysiology of benthic organisms, and have potential effects on other essential ecosystem services and human activities. The inter-annual variability (2009–2016) of winter wave height and WCC in the ria is associated with the combined role played by the North Atlantic Oscillation (NAO) and West Europe Pressure Anomaly (WEPA) indices. The highest waves and strongest WCC occur when negative NAO and positive WEPA phases coincide and can have potentially relevant repercussions on the ecosystem services of the ria, N. Villacieros-Robineau was funded by the Juan de la Cierva-Formación postdoctoral fellowship (FJCI‐2017–34290, MCIN/AEI/10.13039/501100011033). Funding for this study was also provided by “STRAMIX” (CTM2012-35155) and “STRAUSS” (PID2019-106008RB-C21) projects, No

Conferencia sobre los Sistemas de Afloramiento de Borde Oriental (EBUS): Pasado, Presente y Futuro & Segunda Conferencia Internacional sobre el Sistema de Corrientes de Humboldt, 19-23 de Septiembre de 2022, Lima, Perú, Subtidal natural beds of Polititapes rhomboides in the Ría de Vigo (NW Iberia coastal upwelling system) suffered massive mortality events in June 2010 (Darriba et al., 2019). Abnormal high-intensity infections of intracellular prokaryotic colonies (Rickettsiales-like) in the gills, observed in the histopathological study, could explain the clam’s mortality and the drop in this wild population. An atypical long period (7 months) of continuous and strong wave storms entailed high bottom boundary layer dynamics with intense sediment mobilization and resuspension. Immediately after this energetic period, warm water (17ºC) conditions near the seabed prevailed, and these could promote prokaryote colonies proliferation. Stress produced by the continuous wave impact on the seabed could have weakened the clam’s ecophysiology inhibiting an efficient immune response. This physiological status would coincide with the expansion and infection of Rickettsial colonies in the gills, probably boosted by the warmer temperatures. This synergetic effect would have produced massive clam mortality events.
The analysis of wave climate winter variability shows an evident interannual variability related to the NAO (North Atlantic Oscillation) and WEPA (West Europe Pressure Anomaly) climate indices (Villacieros-Robineau et al., 2021). Winters with the highest waves occur during the coincidence of negative NAO and positive WEPA phases. Warmer temperatures and low salinity conditions (downwelling scenarios) are more frequent during these severe winters. Collapses of banded carpet shell populations, with a critical reduction in the abundance and a production decline, occurred after these energetic winters (2000/2001, 2009/2010). During intermediate recovery periods (years with low energy conditions, e.g., 2006-2009), clam populations grow until the subsequent collapse.
This multidisciplinary approach, including histopathological, oceanographic, and population ecology studies, shows that monitoring environmental stressors related to the climate indices can be used as an ecological indicator of the clam’s health population status and evolution with potential applications for managing this and other marine resources, N. Villacieros-Robineau was funded by the Juan de la Cierva-Formación postdoctoral fellowship (FJCI‐2017–34290, MCIN/AEI/10.13039/501100011033). Funding for this study was also provided by “STRAMIX” (CTM2012-35155), “STRAUSS” (PID2019-106008RB-C21) projects and Acción de Investigación PROAMRUBIA (CIMA 19/04), No

Poster.-- Clivar 2023, Towards an integrated view of climate, 24-26 January, Madrid, Several massive mortality events and drops in catches of wild clam beds (Polititapes rhomboides) have been reported during the last decades in the Galician rias (NW Iberia coastal upwelling system). In June 2010, one of these mortality events was detected and monitored in the Ría de Vigo until 2021 (Acción CIMA 19/04, Darriba et al., 2019). The histopathological analysis showed an abnormal high-intensity infection of intracellular prokaryotic colonies (Rickettsiales-like) in the gills of the affected clams that was suggested as the cause of mortality.
We hypothesized that an atypical long period (7 months, autumn 2009 to spring 2010) of continuous and strong wave storms could be the precursor of these infections. Strong waves entailed high bottom boundary layer dynamics with intense sediment mobilization and resuspension inside the ria, which could have weakened the clams' ecophysiology inhibiting an efficient immune response. On top of that, warm water conditions (17ºC) near the seabed prevailed immediately after this energetic period, and could have promoted the prokaryote colonies proliferation. The synergetic effect of stress produced by the continuous wave impact on the seabed and the expansion and infection of Rickettsial colonies would have led to the clams' mortality.
The variability of mean winter wave conditions inside the ria was recently associated with the combination of NAO (North Atlantic Oscillation) and WEPA (West Europe Pressure Anomaly) climate indices (Villacieros-Robineau et al., 2021). Winters with the highest waves occur during negative NAO and/or positive WEPA phases. Warmer temperatures and low salinity conditions (downwelling scenarios) are more frequent during these severe winters. Considering these previous results and following our main hypothesis, we investigated the link between the interannual variability of mean wave height, the infection intensity, and the evolution of the clams’ population. Collapses of banded carpet shell populations, with a critical reduction in the abundance and catch declines, occurred after energetic winters (2000/2001, 2009/2010, 2019/2020, 2020/2021). During intermediate recovery periods (years with low-medium energy conditions, e.g., 2006-2009), clam populations grow until the subsequent collapse.
This multidisciplinary approach, including histopathological, oceanographic, and population ecology studies, shows that monitoring environmental stressors related to climatic indices can be used as an ecological indicator of the health status and evolution of clams’ populations with potential applications for managing this and other marine resources, N. Villacieros-Robineau was funded by Juan de la Cierva-Formación postdoctoral fellowship (FJCI‐2017–34290 funded by MCIN/AEI/10.13039/501100011033). Projects: Acción de Investigación PROAMRUBIA (CIMA 19/04, Xunta de Galicia), STRAMIX (CTM2012-35155), and STRAUSS (PID2019-106008RB-C21) funded by MCIN/AEI/10.13039/501100011033, No

Poster.-- Clivar 2023, Towards an integrated view of climate, 24-26 January, Madrid, The wave regime in the NW Iberia coastal upwelling system is closely related to the seasonal wind regime (Villacieros-Robineau et al., 2019 and 2021). Under upwelling conditions (prevailing northerly winds, spring-summer), swell and wind sea come mainly from NW directions. When southerly winds prevail (downwelling conditions, autumn-winter), swell comes from WNW while wind sea comes from SW directions. The inner areas of coastal bays (rias) of this region are protected from the NW and exposed to the SW, being more vulnerable to the change in the shelf wave direction than the open coast. The wave regime on the shelf and in one of these bays, the Ría de Vigo, was studied between June 2013 and August 2014, using data from an Acoustic Doppler Current Profiler (ADCP; 600 kHz RDI Workhorse Sentinel), a wave-gauge (Vigo Miros Radar), a met-ocean buoy (Silleiro Seawatch buoy), and model results (Copernicus IBI-WAV Reanalysis and SIMAR hindcast). Our results indicate that swell is almost always attenuated when entering the bay, and wave height inside the ria depends mostly on shelf wind sea variability. During the upwelling season, both swell and wind sea barely enter the ria, and wave heights inside the ria are small (Hs50% = 0.21 m). During the downwelling season, shelf wind sea directly enters the ria, contributing more to the total wave height, which achieves its maximum values (Hs50% = 0.46 m). There is a cumulative action of wave and wind-driven currents (wave-current coupling, WCC) that is strongest during the downwelling season. The WCC entails an increase in seabed energy, which could reinforce bottom remineralization, produce changes in the ecophysiology of benthic organisms, and have potential effects on other essential ecosystem services and human activities (Villacieros-Robineau et al., 2017, 2022). The inter-annual variability (2009–2016) of winter wave height and WCC in the ria is associated with the combined role played by the North Atlantic Oscillation (NAO) and West Europe Pressure Anomaly (WEPA) indices. The highest waves and strongest WCC occur when negative NAO and positive WEPA phases coincide and can have potentially relevant repercussions on the ecosystem services of the ria, N. Villacieros-Robineau and P. C. Pardo were funded by MCIN/AEI /10.13039/501100011033 through a Juan de la Cierva-Formación postdoctoral fellowship (FJCI-2017–34290) and a Personal Técnico de Apoyo grant (PTA2019-017492-I), respectively. Projects: STRAMIX (CTM2012-35155) and STRAUSS (PID2019-106008RB-C21) funded by MCIN/AEI/10.13039/501100011033, No

This item is made of 2 files, of which 1 is the dataset in netcdf format and the other (Readme .txt) include a small description of the computed variables.-- Dataset contributed to the Project STRAMIX (STRAtification and MIXing in a coastal upwelling driven estuary, CTM2012-35155).-- Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0). The STRAMIX team appreciates that users of these data: 1) Contact Miguel Gil Coto (mgilcoto@iim.csic.es) or Nicolás Villacieros (nvrobineau@iim.csic.es) to follow the uses of the data, and 2) Include the requested acknowledgment (cite using the DOI of this dataset and please also cite Gilcoto et al. 2017) in any presentations or publications, Tidal harmonic analysis of ADCP currents from june 2013 to August 2014 in the Ría de Vigo (NW Iberia, Atlantic Ocean), STRAMIX project. Horizontal velocities were screened for errors greater than 20cm/s following Gilcoto et al., 2009. Afterwards, each of the 55 current-velocity vertical levels (75 cm bin size) were averaged every 5 minutes. Finally, the MATLAB tidal analysis package t-tide (Pawlowicz et al., 2002) was applied, level by level, to the vectorial combined horizontal velocity components. A database of ellipse parameters for the 55 levels and 53 tidal constituents (selected with a Rayleigh criteria of 1) was obtained. The length of the time series allowed us for the first time to separate S1 and K1, Funding for this study was provided by the Spanish Ministry of Economy and Competitiveness under the STRAMIX (CTM2012-35155) research project., No

This item is made of 2 files, of which 1 is the dataset in netcdf format and the other (Readme .txt) include a small description of the computed variables.-- Dataset contributed to the Project STRAMIX (STRAtification and MIXing in a coastal upwelling driven estuary, CTM2012-35155).-- Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0). The STRAMIX team appreciates that users of these data: 1) Contact Miguel Gil Coto (mgilcoto@iim.csic.es) or Nicolás Villacieros (nvrobineau@iim.csic.es) to follow the uses of the data, and 2) Include the requested acknowledgment (cite using the DOI of this dataset and please also cite Gilcoto et al. 2017) in any presentations or publications, Average directional wave spectrum from 28118 wave spectra obtained from ADCP currents between june 2013 and August 2014 in the Ría de Vigo (NW Iberia, Atlantic Ocean), STRAMIX project. Waves Monitor Software (RDI) was used to obtain the 28118 individual wave spectra. Criteria applied to compute parameters were: 20 minutes bursts with tilt and current correction every 10 minutes, maximum wave period of 28.6 s, sea-swell transition period of 7.3 s, 256 frequency bands, and 180 angles, Funding for this study was provided by the Spanish Ministry of Economy and Competitiveness under the STRAMIX (CTM2012-35155) research project, No

1 poster.-- V Encuentro de Oceanografía Física, Vigo, 20, 21 y 22 de junio de 2018, Funding for this study was provided by the Spanish Ministry of Economy and Competitiveness (STRAMIX,
CTM2012-35155) and Xunta de Galicia (Grupos de Referencia Competitiva, IN607A2016/11), No