Influence of high-resolution wind forcing on hydrodynamic modeling of the Gulf of Lions

2011 ◽  
Vol 61 (11) ◽  
pp. 1823-1844 ◽  
Author(s):  
Amandine Schaeffer ◽  
Pierre Garreau ◽  
Anne Molcard ◽  
Philippe Fraunié ◽  
Yann Seity
Keyword(s):  
High Resolution ◽  
Hydrodynamic Modeling ◽  
Wind Forcing ◽  
Gulf Of Lions

Data assimilative twin-experiment in a high-resolution Bay of Biscay configuration: 4DEnOI based on stochastic modeling of the wind forcing

2016 ◽  
Vol 100 ◽  
pp. 1-19 ◽  
Author(s):  
V. Vervatis ◽  
C.E. Testut ◽  
P. De Mey ◽  
N. Ayoub ◽  
J. Chanut ◽  
...  
Keyword(s):  
High Resolution ◽  
Stochastic Modeling ◽  
Wind Forcing ◽  
Bay Of Biscay

scholarly journals Improved ocean wind forcing products

2020 ◽  
Author(s):  
Rianne Giesen ◽  
Ana Trindade ◽  
Marcos Portabella ◽  
Ad Stoffelen
Keyword(s):  
High Resolution ◽  
Weather Prediction ◽  
Surface Wind ◽  
Ocean Surface ◽  
Ocean Model ◽  
Wind Forcing ◽  
Small Scale ◽  
Wind Fields ◽  
Ocean Surface Wind ◽  
Ocean Wind

<p>The ocean surface wind plays an essential role in the exchange of heat, gases and momentum at the atmosphere-ocean interface. It is therefore crucial to accurately represent this wind forcing in physical ocean model simulations. Scatterometers provide high-resolution ocean surface wind observations, but have limited spatial and temporal coverage. On the other hand, numerical weather prediction (NWP) model wind fields have better coverage in time and space, but do not resolve the small-scale variability in the air-sea fluxes. In addition, Belmonte Rivas and Stoffelen (2019) documented substantial systematic error in global NWP fields on both small and large scales, using scatterometer observations as a reference.</p><p>Trindade et al. (2019) combined the strong points of scatterometer observations and atmospheric model wind fields into ERA*, a new ocean wind forcing product. ERA* uses temporally-averaged differences between geolocated scatterometer wind data and European Centre for Medium-range Weather Forecasts (ECMWF) reanalysis fields to correct for persistent local NWP wind vector biases. Verified against independent observations, ERA* reduced the variance of differences by 20% with respect to the uncorrected NWP fields. As ERA* has a high potential for improving ocean model forcing in the CMEMS Model Forecasting Centre (MFC) products, it is a candidate for a future CMEMS Level 4 (L4) wind product. We present the ongoing work to further improve the ERA* product and invite potential users to discuss their L4 product requirements.</p><p>References:</p><p>Belmonte Rivas, M. and A. Stoffelen (2019): <em>Characterizing ERA-Interim and ERA5 surface wind biases using ASCAT</em>, Ocean Sci., 15, 831–852, doi: 10.5194/os-15-831-2019.</p><p>Trindade, A., M. Portabella, A. Stoffelen, W. Lin and A. Verhoef (2019), <em>ERAstar: A High-Resolution Ocean Forcing Product</em>, IEEE Trans. Geosci. Remote Sens., 1-11, doi: 10.1109/TGRS.2019.2946019.</p>

Modulation of Small-Scale Superinertial Internal Waves by Near-Inertial Internal Waves

2016 ◽  
Vol 46 (12) ◽  
pp. 3529-3548 ◽  
Author(s):  
Zhao Jing ◽  
Ping Chang
Keyword(s):  
High Resolution ◽  
Gulf Of Mexico ◽  
Numerical Simulations ◽  
Internal Waves ◽  
Vertical Motion ◽  
Wind Forcing ◽  
Small Scale ◽  
Model Simulations ◽  
Theoretical Finding ◽  
Convergence Zones

AbstractDynamics of small-scale (<10 km) superinertial internal waves (SSIWs) of intense vertical motion are investigated theoretically and numerically. It is shown that near-inertial internal waves (NIWs) have a pronounced influence on modulation of SSIW strength. In convergence zones of NIWs, energy flux of SSIWs converge and energy is transferred from NIWs to SSIWs, leading to rapid growth of SSIWs. The opposite occurs when SSIWs enter divergence zones of NIWs. The underlying dynamics can be understood in terms of wave action conservation of SSIWs in the presence of background NIWs. The validity of the theoretical finding is verified using realistic high-resolution numerical simulations in the Gulf of Mexico. The results reveal significantly stronger small-scale superinertial vertical motions in convergence zones of NIWs than in divergence zones. By removing near-inertial wind forcing, model simulations with identical resolution show a substantial decrease in the small-scale superinertial vertical motions associated with the suppression of NIWs. Therefore, these numerical simulations support the theoretical finding of SSIW–NIW interaction.

scholarly journals Imaging seafloor instabilities using very high-resolution deep-towed multichannel seismic data in the Gulf of Lions (NW Mediterranean)

2020 ◽  
Author(s):  
Shray Badhani ◽  
Antonio Cattaneo ◽  
Florent Colin ◽  
Bruno Marsset ◽  
Roger Urgeles ◽  
...  
Keyword(s):  
High Resolution ◽  
Mass Transport ◽  
Internal Structure ◽  
Seismic Data ◽  
Submarine Landslides ◽  
Slope Failures ◽  
Gulf Of Lions ◽  
Multichannel Seismic Data ◽  
Very High

&lt;p&gt;&lt;span&gt;The Gulf of Lions (GoL) is a passive margin of about 200 km long and 70 km wide with main sediment supply from the Rhone River supplying Alpine sediments to the Rhone delta. Submarine landslides in the GoL are widespread from the upper slope to the deep basin, within the canyon flanks and in the interfluves of major canyons. The two main submarine landslides present in the GoL are the Eastern Rh&amp;#244;ne Interfluve Slide (ERIS) and an unnamed slide complex on the western side of the Petit Rhone Canyon. Their resulting mass transport deposits (MTDs), the Rhone Eastern MTD (REMTD) and the Rhone Western MTD (RWMTD) have previously been described in detail in several studies. However, due to the lack of high-resolution multidisciplinary datasets, such as high-resolution seismic, sediment cores, and&amp;#160;&lt;/span&gt;&lt;em&gt;&lt;span&gt;in-situ&amp;#160;&lt;/span&gt;&lt;/em&gt;&lt;span&gt;geotechnical measurements, a detailed analysis of weak layers and preconditioning factors was never performed. Here, we present a suite of a multidisciplinary dataset; particularly very high-resolution deep-towed multichannel seismic data acquired using Ifremer&amp;#8217;s in-house acquisition system SYSIF (SYst&amp;#232;me SIsmique de Fond) to assess seafloor instabilities in the GoL. The objectives of this study are twofold and aimed at 1) using deep-towed multichannel seismic data to capture the internal structure of the mass-wasting products previously imaged as seismically transparent or chaotic intervals in conventional seismic data; 2) using multidisciplinary dataset to analyse the basal surfaces of slope failures in the GoL. For the first time, the newly-acquired SYSIF data show in unprecedented detail the internal structure of mass-transport deposit along with small-scale slope failures. We present here an example of a failure that consists of slide blocks, folded and faulted strata with remnant stratigraphy previously associated with a transparent or chaotic facies in the conventional reflection seismic data. The combination of deep-towed seismic and sedimentological data, as well as &lt;/span&gt;&lt;em&gt;&lt;span&gt;in-situ&amp;#160;&lt;/span&gt;&lt;/em&gt;&lt;span&gt;measurements allowed us to analyse and characterize the nature of the basal surface of the slope failures in greater detail. We show that the basal surfaces of the recurring slope failures mainly consist of fine-grained clay-rich sediments as compared to turbiditic sequences typical of Rhone turbiditic system. Such observations suggest that greater degree of lithological heterogeneity in sedimentary strata promotes slope failure in the GoL, most likely related to higher liquefaction potential of coarser-grained material, excess pore pressure and possibly resulting variation in sediment strength.&lt;/span&gt;&lt;/p&gt;

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