Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010

Esnaola, Ganix; Sáenz, Jon; Zorita, Eduardo; Fontán, Almudena; ­Valencia, Victoriano; Lazure, Pascal

doi:10.5194/os-9-655-2013

Cited by 12 publications

(11 citation statements)

References 54 publications

(116 reference statements)

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“…Hourly wind data from the Weather Research and Forecasting model (WRF; http://mandeo.meteogalicia.es/ thredds/catalogos/WRF_2D/catalog.html, last access: 1 October 2018) were provided by the meteorological agency of Galicia (MeteoGalicia). This model, with a native resolution of 12 km, reproduces the offshore wind fields of the SE-BoB (Ferrer et al, 2010) with reasonable accuracy. In this study, the WRF gridded fields were interpolated to the Jason-2 along-track points.…”

Section: Wind Data and Sea Surface Temperature Imagesmentioning

confidence: 77%

“…The poleward patterns observed by the HFR agree with the AC G observed along the altimetry track, which shows that poleward currents intensified over the slope. For the four events, the SST images show that the current intensi- fications along the slope are related to an increase of 0.5-1 • C over time (not shown), which is the increase in temperature that is typically associated with the slope current intensification in the study area (Esnaola et al, 2013). The spatial extension of the warm water masses and the IPC along the French shelf/slope depends on the event, and it coincides with the area where the highest agreement between AC G and HFR total currents is observed.…”

Section: Observability Of the Ipcmentioning

confidence: 95%

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Joint analysis of coastal altimetry and high-frequency (HF) radar data: observability of seasonal and mesoscale ocean dynamics in the Bay of Biscay

et al. 2018

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Abstract. Land-based coastal high-frequency (HF) radar systems provide operational measurements of coastal surface currents (within 1–3 m depth) with high spatial (300 m–10 km) and temporal (≤1 h) sampling resolutions, while the near-continuous altimetry missions provide information, from 1993 until today, on geostrophic currents in the global ocean with typical along-track and temporal sampling resolutions of >7 km and >9 days, respectively. During the last years, the altimetry community has made a step forward in improving these data in the coastal area, where the data present lower quality than in the open ocean. The combination of HF radar and altimetry measurements arises as a promising strategy to improve the continuous monitoring of the coastal area (e.g. by expanding the measurements made by HF radars to adjacent areas covered by the altimetry or by validating/confirming improvements brought by specific coastal algorithms or new altimeter missions). A first step towards this combination is the comparison of both data sets in overlapping areas. In this study, a HF radar system and two Jason-2 satellite altimetry products with different processing are compared over the period from 1 January 2009 to 24 July 2015. The results provide an evaluation of the performance of different coastal altimetry data sets within the study area and a better understanding of the ocean variability contained in the HF radar and altimetry data sets. Both observing systems detect the main mesoscale processes within the study area (the Iberian Poleward Current and mesoscale eddies), and the highest correlations between radar and altimetry (up to 0.64) occur in the slope where the Iberian Poleward Current represents a significant part of the variability in the circulation. Besides, the use of an Ekman model, to add the wind-induced current component to the altimetry-derived geostrophic currents, increases the agreement between both data sets (increasing the correlation by around 10 %).

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Section: Wind Data and Sea Surface Temperature Imagesmentioning

confidence: 77%

Section: Observability Of the Ipcmentioning

confidence: 95%

Joint analysis of coastal altimetry and high-frequency (HF) radar data: observability of seasonal and mesoscale ocean dynamics in the Bay of Biscay

et al. 2018

View full text Add to dashboard Cite

show abstract

“…fications along the slope are related to an increase of 0.5-1 • C over time (not shown), which is the increase in temperature that is typically associated with the slope current intensification in the study area (Esnaola et al, 2013). The spatial extension of the warm water masses and the IPC along the French shelf/slope depends on the event, and it coincides with the area where the highest agreement between AC G and HFR total currents is observed.…”

Section: Observability Of the Ipcmentioning

confidence: 65%

Response to reviewer 2 and marked manuscript

Manso¹

2018

Preprint

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Land-based coastal high-frequency (HF) radar systems provide operational measurements of coastal surface currents (within 1-3 m depth) with high spatial (300 m-10 km) and temporal (≤ 1 h) sampling resolutions, while the near-continuous altimetry missions provide information, from 1993 until today, on geostrophic currents in the global ocean with typical along-track and temporal sampling resolutions of > 7 km and > 9 days, respectively. During the last years, the altimetry community has made a step forward in improving these data in the coastal area, where the data present lower quality than in the open ocean. The combination of HF radar and altimetry measurements arises as a promising strategy to improve the continuous monitoring of the coastal area (e.g. by expanding the measurements made by HF radars to adjacent areas covered by the altimetry or by validating/confirming improvements brought by specific coastal algorithms or new altimeter missions). A first step towards this combination is the comparison of both data sets in overlapping areas. In this study, a HF radar system and two Jason-2 satellite altimetry products with different processing are compared over the period from 1 January 2009 to 24 July 2015. The results provide an evaluation of the performance of different coastal altimetry data sets within the study area and a better understanding of the ocean variability contained in the HF radar and altimetry data sets. Both observing systems detect the main mesoscale processes within the study area (the Iberian Poleward Current and mesoscale eddies), and the highest correlations between radar and altimetry (up to 0.64) occur in the slope where the Iberian Poleward Current represents a significant part of the variability in the circulation. Besides, the use of an Ekman model, to add the wind-induced current component to the altimetry-derived geostrophic currents, increases the agreement between both data sets (increasing the correlation by around 10 %).

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“…to local winds and the mean coastal current (Iberian Poleward Current) (Esnaola et al, 2013, Solabarrieta et al, 2014. The circulation in the area covered by the central Red Sea HFR also demonstrates a clear seasonality (Sofianos and Johns, 2003;Yao et al, 2014aYao et al, , 2014bZarokanellos et al, 2016Zarokanellos et al, , 2017 linked to the seasonal winds of the area (Abualnaja et al, 2014;Langodan et al, 2017).…”

Section: Datamentioning

confidence: 99%

A new Lagrandian based short term prediction methodology for HF radar currents

Solabarrieta

Hernández‐Carrasco

Rubio

et al. 2020

Preprint

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Abstract. The use of High Frequency Radar (HFR) data is increasing worldwide for operational oceanography and data assimilation, as it provides real-time coastal surface currents at high temporal and spatial resolution. In this work, a Lagrangian based empirical real-time, Short-Term Prediction (L-STP) system is presented in order to provide short term forecasts of up to 48 hours of ocean currents from HFR data. The method is based on the finding of historical gridded analogues of Lagrangian trajectories obtained from HFR surface currents. Then, assuming that the present state will follow the same temporal evolution as did the historical analogue, we obtain a short-term prediction of the surface currents. The method is applied to two HFR systems covering two areas with different dynamical characteristics: the southeast Bay of Biscay and the central Red Sea. The L-STP improves on previous prediction systems implemented for the SE Bay of Biscay and provides good results for the Red Sea study area. A comparison of the L-STP methodology with predictions based on persistence and reference fields has been performed in order to quantify the error introduced by this Lagrangian approach. Furthermore, a temporal sensitivity analysis has been addressed to determine the limit of applicability of the methodology regarding the temporal horizon of Lagrangian prediction. A real-time skill-score has been developed using the results of this analysis which allows to identify periods when the short-term prediction performance is more likely to be low and persistence can be used as a better predictor for the future currents.

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Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010

Cited by 12 publications

References 54 publications

Joint analysis of coastal altimetry and high-frequency (HF) radar data: observability of seasonal and mesoscale ocean dynamics in the Bay of Biscay

Joint analysis of coastal altimetry and high-frequency (HF) radar data: observability of seasonal and mesoscale ocean dynamics in the Bay of Biscay

Response to reviewer 2 and marked manuscript

A new Lagrandian based short term prediction methodology for HF radar currents

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