shelf response to intense offshore wind this is the accepted version of the following article grifoll m aretxabaleta a espino m shelf response to intense offshore wind journal of geophysical research setembre 2015 vol 120 num 9 p 6564 6580 which has been published in final form at http onlinelibrary wiley com doi 10 1002 2015jc010850 full

the surface circulation of the balearic sea until recently the surface circulation of the balearic sea has been viewed as largely cyclonic with a fairly quiescent central dome however recent studies involving ship data tracked drifters current meter moorings and satellite imagery indicate that this sea has strong mesoscale variability and a more complex general circulation these studies together with an examination of registered satellite imagery collected during the western mediterranean circulation experiment wmce indicate that the surface circulation is strong year round and characterized by two permanent density fronts located on the continental shelf slope the catalan front and the balearic islands shelf slope the balearic front the catalan front is the more active of the two fronts in the northern area a plume of cold water is frequently observed moving southward along the continental slope region shedding dipole eddies along the leading edge of the plume in addition the catalan front continuously spawns energetic filaments that appear to be associated with the plume of cool water the likely mechanism of formation of these filaments is the deflection of the cold water by the regional submarine canyons

seasonal circulation over the catalan inner shelf northwest mediterranean sea 1 this study characterizes the seasonal cycle of the catalan inner shelf circulation using observations and complementary numerical results the relation between seasonal circulation and forcing mechanisms is explored through the depth averaged momentum balance for the period between may 2010 and april 2011 when velocity observations were partially available the monthly mean along shelf flow is mainly controlled by the along shelf pressure gradient and by surface and bottom stresses during summer fall and winter the along shelf momentum balance is dominated by the barotropic pressure gradient and local winds during spring both wind stress and pressure gradient act in the same direction and are compensated by bottom stress in the cross shelf direction the dominant forces are in geostrophic balance consistent with dynamic altimetry data

origin and pathways of winter intermediate water in the northwestern mediterranean sea using observations and numerical simulation received 25 june 2013 revised 31 october 2013 accepted 6 november 2013 published 6 december 2013 1 the study of water masses worldwide their formation spreading mixing and impact on general circulation is essential for a better understanding of the ocean circulation and variability in this paper the formation and main pathways of winter intermediate water wiw in the northwestern mediterranean sea nwmed are investigated during the winter spring 2011 using observations and numerical simulation the main results show that the wiw formed along the continental shelves of the gulf of lion and balearic sea circulates southward following five preferential pathways depending on the wiw formation site location and the oceanic conditions wiw joins the northeastern part of the balearic sea or flows along the continental shelves until joining the balearic current maximum of 0 33 sv in early april or further south until the ibiza channel entrance two additional trajectories contributing to water mass exchanges with the southern part of the western mediterranean sea bring the wiw through the ibiza and mallorca channels maxima of 0 26 sv in late march and 0 1 sv in early april respectively the circulation of wiw over the nwmed at 50 200 m depth its mixing and spreading over the western mediterranean sea reaching the south of the balearic islands the algero provencal basin the ligurian and the alboran seas suggest that the wiw may have an impact on the ocean circulation by eddy blocking effect exchange of water masses between north and south subbasins of western mediterranean sea through the ibiza channel or modification of the ocean stratification

along shelf current variability on the catalan inner shelf nw mediterranean 1 we examine the circulation over the inner shelf of the catalan sea using observations of currents obtained from three acoustic doppler current profilers two at 24 m and one at 50 m during march april 2011 the along shelf current fluctuations during that period are mainly controlled by local wind stress on short time scales and by remote pressure gradients on synoptic time scales different forcing mechanisms are involved in the along shelf momentum balance during storm conditions wind stress sea level gradients and the nonlinear terms dominate the balance during weak wind conditions the momentum balance is controlled by the pressure gradient while during periods of moderate wind in the presence of considerable stratification the balance is established between the coriolis and wind stress terms vertical variations of velocity are affected by the strong observed density gradient the increased vertical shear is accompanied by the development of stratified conditions due to local heating when the wind is not able to counteract and break stratification the occasional influence of the besos river plume is observed in time scales of hours to days in a limited area in near the city of barcelona the area affected by the plume depends on the vertical extent of the fresher layer the fast river discharge peak and the relaxation of cross shore velocities after northeast storm events this contribution provides a first interpretation of the inner shelf dynamics in the catalan sea

a study of the tornadic region within a supercell thunderstorm abstract the transition of a supercell thunderstorm into its tornadic phase is investigated through high resolution numerical cloud model simulations initiated within the interior portion of a previously simulated mature supercell storm with the enhanced grid resolution the low level cyclonic vorticity increases dramatically and the gust front rapidly occludes as small scale downdrafts develop in the vicinity of the low level center of circulation as the occlusion progresses a ring of high vorticity air surrounds the circulation center and could be conducive to multiple vortex tornado formation numerous features of the simulated transition bear resemblance to those observed in tornadic storms in the model simulation the large low level vorticity is generated through the tilting and intense stretching of air from the inflow side of the storm this vertical vorticity is derived from the horizontal vorticity of the environmental shear and also from horizontal vorticity generated solenoidally as low l

morphological changes beach inundation and overwash caused by an extreme storm on a low lying embayed beach bounded by a dune system nw mediterranean abstract the geomorphological evolution of a low lying micro tidal sandy beach in the western mediterranean pals beach was characterized using airborne light detection and ranging lidar data data were collected in prior to and six months after the impact of an extreme storm with a return period of approx 50 years with the aim of characterizing the beach s response to the storm the use of repeated high resolution topographic data to quantify beach geomorphic changes has allowed assessment of the accuracy of different proxies for estimating beach volume changes results revealed that changes in the shoreline position cannot accurately reproduce beach volume changes on low lying beaches where overwash processes are significant observations also suggested that volume estimations from beach profiles do not accurately represent subaerial volume changes at large profile distances on beaches with significant alongshore geomorphological variability accordingly the segmentation of the beach into regularly spaced bins is proposed to assess alongshore variations in the beach volume with the accuracy of the topographic data the morphological evolution of pals beach during the study period showed a net shoreline retreat 4 m and a significant sediment gain on the subaerial beach 7 5 m 3 m the net gain of sediment is mostly due to the impact of the extreme storm driving significant overwash processes that transport sediment landwards increasing volume on the backshore and dunes the increase of volume on the foreshore and the presence of cuspate morphologies along the shoreline also evidence post storm beach recovery observed morphological changes exhibit a high variability along the beach related to variations in beach morphology changes in the morphology and migration of megacusps result in a high variability in the shoreline position and foreshore volume changes on the other hand larger morphological changes on the backshore and larger inundation distances occur when the beach and the dunes are lower favouring the dominance of overwash the observed storm induced morphological changes differ from predicted beach storm impacts because of spatial and temporal variations in the beach morphology suggesting that detailed morphological parameters and indicators used for predicting beach vulnerability to storms should be regularly updated in order to represent the pre storm beach conditions finally observed morphological changes in pals bay evidenced a different behaviour between natural and urban areas with better post storm beach recovery on natural areas where the beach is not artificially narrowed

linear and nonlinear propagation of supercell storms abstract a nonlinear formula for updraft motion in supercell storms is derived from petterssen s formula for the motion of systems and the vertical equation of motion and tested on form preserving disturbances at each level continuous propagation of an updraft maximum is determined largely by the horizontal gradient of the nonhydrostatic vertical pressure gradient force nhvpgf at the updraft center the nhvpgf is deduced from the formal solution of the poisson equation for nonhydrostatic pressure in anelastic flow subject to homogeneous neumann boundary conditions at the ground and top boundary recourse also is made to published fields of partitioned vertical pressure gradient force updraft motion is partitioned into parts forced by horizontal gradients of hydrostatic pressure linear interaction between the environmental shear and updraft and nonlinear dynamical effects the dynamics of supercell storms for nearly straight and highly curved hodographs are found to be different nonlinear rotation

dynamic thinning of antarctic glaciers from along track repeat radar altimetry since 2002 the envisat radar altimeter has measured the elevation of the antarctic ice sheet with a repeat cycle of 35 days this long and regular time series is processed using an along track algorithm to depict in detail the spatial and temporal pattern of elevation change for the whole ice sheet we use this dataset to examine the spatial and temporal pattern of pine island glacier pig thinning and compare it to the neighbouring glaciers we also examine additional areas especially in east antarctica whose mass balance is poorly known one advantage of the finer along track spacing of measurements is that it reveals places of dynamic thinning in regions of rapid ice flow we observe the acceleration of thinning on pig over the entire basin the volume loss increased from 7 km3 a 1 during 2002 06 to 48 km3 a 1 during 2006 10 we also observe accelerated thinning on the lower tens of kilometres of thwaites glacier with a mean thinning of 0 18 m a 1 over its entire basin during our observation period we confirm the dynamic thinning of totten glacier but we do not detect significantly accelerated thinning on any glacier elsewhere than on the coast of the amundsen sea

the last 100 000 years in the western mediterranean sea surface water and frontal dynamics as revealed by coccolithophores a quantitative analysis was carried out on coccolith assemblages from two pleistocene cores k1 and k10 from the western mediterranean the distribution of selected coccolithophore species provides new paleoclimatic and paleoceano graphic data a continuous sequence from the top of isotope stage 5 to the holocene was recorded the reversal in dominance between gephyrocapsa muellerae and emiliania huxleyi was dated in both cores at ca 73 ka at about 47 ka e huxleyi shows a regular increase whereas g muellerae progressively decreases in abundance during interglacial periods high concentrations of coccoliths are observed whereas in glacial times coccoliths are more diluted and the percentage of reworked forms increases as a consequence of the higher terrigenous input after taking careful account of the dilution factor we conclude that the production of coccolithophores was higher during warm periods maxima in coccolith concentrations coincide with highstand episodes probably as a result of the intensification of the atlantic flux into the mediterranean across the gibraltar strait this intensification could have produced an increase in nutrient content in the surface mediterranean waters during cold periods the western mediterranean front underwent a reduction in activity probably due to an increase in the saline and or thermal gradients between the superficial waters and intermediate waters in the liguro provencal basin

model studies of near inertial motion on the continental shelf off northeast spain a three dimensional two dimensional one dimensional model comparison study 1 a three dimensional nonlinear model of the balearic sea region is used to examine the spatial distribution of wind induced near inertial internal waves results from the model are compared with those from two dimensional cross section and single point models in the case of motion induced by a wind pulse there is no significant along shelf flow and comparable solutions are obtained from the three and two dimensional models however when forced with a realistic wind a significant along shelf flow is produced that is larger in the cross section model than in the three dimensional model because of the absence of an along shelf pressure gradient associated with this change in flow are important differences in across shelf currents and temperature fields that influence the distribution of near inertial motion since the point model cannot take account of internal pressure gradients near inertial internal waves are absent however when some account of barotropic pressure gradients related to local wind stress are included currents and inertial oscillations were in better agreement with the three dimensional model than with the cross section model although the major features of the wind induced deepening of the thermocline could be reproduced by the single point model the absence of internal waves and mixing associated with them lead to a sharper thermocline than in the three dimensional model comparison of two and one dimensional models with the full three dimensional model shows some severe limitations in the simpler models

multiscale variability in the balearic sea an altimetric perspective 1 the present day availability of an 18 year record of 1 8 merged mediterranean sea sea level anomaly sla data enables a contemporary description of long term mesoscale activity in the balearic sea sla data from satellite altimetry are used to study the variability of sea level and surface geostrophic circulation at different spatial and temporal scales within this complex and relatively understudied region in the western mediterranean wmed we find that the mean northern current along the iberian slope is strongest in autumn although higher variability in winter leads to stronger peaks in kinetic energy the balearic current which flows along the northern slopes of the balearic islands also has its maximum expression in autumn across the two balearic channels ibiza and mallorca key locations that partly regulate meridional exchange in the wmed observed seasonal variability in geostrophic velocity anomalies conforms rather well to prior descriptions suggesting cautious confidence in the use of the mediterranean merged altimeter product in nearshore regions circulation through the channels is maximum in winter the channel data support the hypothesis that the channel circulation may be hindered by the intermittent presence of the western intermediate water mass which sometimes forms in winter in the gulf of lions this is the first time that an analysis of variability in the balearic channels has been performed using altimetric data

coastal and mesoscale dynamics characterization using altimetry and gliders a case study in the balearic sea 1 dynamics along the continental slopes are difficult to observe given the wide spectrum of temporal and spatial variability of physical processes which occur coastal currents meanders eddies etc studying such complex dynamics requires the development of synergic approaches that use integrated observing systems in this context we present the results of an observational program conducted in the balearic sea combining coastal gliders and altimetry the objectives of this experiment are to study regional dynamics using new technologies such as gliders in synergy with satellite altimetry and to investigate the limitations and potential improvement to altimetric data sets in the coastal zone in this regard new methodologies have been developed to compute consistent altimetric and glider velocities and a novel technique to estimate absolute glider velocities combining surface glider geostrophic velocities with integrated currents estimated from the glider gps positioning has been applied in addition the altimetric velocity computation has been improved especially in the coastal zone using high frequency along track sampling associated with new filtering and editing techniques this approach proves efficient for homogenizing the physical contents of altimetry and glider surface currents percentage of standard deviation explained is 40 and characterizing regional dynamics in the balearic sea through a combined analysis of a high resolution observing system such as the appearance of anomalous intense mesoscale features missing in the classical circulation scheme of the balearic sea

multivariate analysis of the surface circulation in the balearic sea this study gives a comprehensive view of the regional surface circulation of the balearic sea in early summer its spatial variability and dynamics are described from a multivariate analysis of axbt ctd and adcp data collected during the mesoscale experiment fe 91 may 22 june 2 1991 the results provide evidence of two energetic frontal jets that drive the circulation over the slopes the southward continental current 0 9sv and the northward balearic current 0 5sv in the southern balearic basin to the north of the ibiza sill the analyses show that the slope circulation is drastically modified by a wide pool 70km of winter intermediate waters wiw in this region both the continental and balearic currents leave the slopes and merge offshore as a result the continental current veers cyclonically to the north and flows along the insular slope numerous mesoscale structures eddies meanders and filaments are found in the centre of the basin directly related to instabilities of the frontal jets often induced by sharp topographic irregularities and subsurface eddies and involving significant offshore transport of slope waters assuming stationarity of the velocity field a lagrangian integration is performed to establish the trajectories and time scales associated with the analysed velocity field the calculations indicate that a drifter released in the core of the continental current at 22m depth drifts cyclonically around the balearic basin and reaches the north of mallorca in less than 40 days this is consistent with data from an in situ surface drifter deployed in june 1993 and suggests that the velocity field obtained from fe 91 data is representative of the summer circulation of the balearic sea all these results are discussed in the perspective of the general circulation of the western mediterranean

a comparison of seasonal winds with currents on the continental slope of the catalan sea northwestern mediterranean the waters of the northwestern region of the mediterranean sea follow the continental shelf break in a flow that appears to be linked to a permanent shelf slope density front several studies are underway to evaluate the role of the possible forces that drive this circulation the continental margin located off the ebro river is an area of persistent and high intensity winds long term representative seasonal wind and current meter data are presented here in a comparative analysis of the temporal variability of both fields the data seem to indicate that the local wind field is not responsible for the characteristics of the marine circulation the wind is only able to develop significant inertial oscillations in spring and may contribute to the intensification of the currents only during the cold season in addition the variability of the current field shows no relationship to wind variability important mesoscale activity is probably associated with variations of the density structure and not with the wind in essence the wind provides no appreciable direct contribution to modifying the general circulation

water and sediment fluxes on the ebro delta shoreface on the role of low frequency currents abstract field measurements of water and sediment fluxes were acquired on the ebro delta shoreface at depths of 8 5 and 12 5 m during winter this period was characterised by high river discharges a dominant nw wind and the presence of six wave storms the survey can be considered as being typical of high energy conditions water fluxes on the shoreface were jointly dominated by mesoscale shelf processes anticyclonic gyre on the ebro shelf inducing a dominant northward flow and by local meteorological forcing n ne winds inducing southward current reversals which were coupled with the presence of e wave storms the concentration of suspended sediment in the water column was associated with wave activity i e wave induced near bottom velocity moreover a lag of 6 h was found between the concentration time series at both locations which was associated with a slow seaward advection of fine sediment as a result of this advection an increase of 30 in the content of fines of the bottom sediment at the deepest location was detected during the survey period measured sediment fluxes presented a pulsating structure related to mean current fluctuations and fluctuations in sediment concentration induced by waves longshore transport rates were dominant over cross shore rates when time integrated the net cross shore fluxes were offshore at the outer site and onshore at the inner site due to differences in current direction since it shifted towards the coast at the shallower location net longshore transport was almost nil when current reversals were present and when disappeared transport at the inner shelf was northward

sub surface small scale eddy dynamics from multi sensor observations and modeling the study of mesoscale and submesoscale hereafter sub mesoscale hydrodynamic features is essential for understanding thermal and biogeochemical exchanges between coastal areas and the open ocean in this context a glider mission was conducted in august 2008 closely co located and almost simultaneously launched with a jason 2 altimetric pass to fully characterize the currents associated with regional sub mesoscale processes regularly observed to the north of mallorca mediterranean sea a synoptic view from satellite remote sensing fields before and during the glider mission provided a descriptive picture of the main surface dynamics at the balearic basin scale to quantify the absolute surface geostrophic currents the coastal altimetry derived current computation was improved and cross compared with its equivalent derived from glider measurements model simulations were then validated both qualitatively and statistically with the multi sensor observations the combined use of modeling and multi sensor observational data reveals the baroclinic structure of the balearic current and the northern current and a small scale anticyclonic eddy observed northeast of the mallorca coast current 15 cm s 180 m deep this mesoscale structure partially intercepted by the glider and along track altimetric measurements is marked by relatively strong salinity gradients and not as is more typical temperature gradients finally the use of the validated model simulation also shows that the geostrophic component of this small scale eddy is controlled by sub surface salinity gradients we hypothesize that this structure contains recently modified atlantic water arriving from the strait of ibiza due to a northerly wind which strengthens the northward geostrophic circulation

initiation and evolution of updraft rotation within an incipient supercell thunderstorm abstract one of the distinguishing characteristics of a supercell thunderstorm is the presence of a rotating updraft during the past 30 years various hypotheses have been proposed to explain the initiation and maintenance of rotation however attempts to verify the initiation process have been frustrated by the lack of multiple doppler radar measurements at the time that the first rotating updraft appears discussed in this paper are dual doppler radar measurements that successfully captured the initiation and evolution of rotation in the agawam oklahoma storm of 6 june 1979 which occurred during the storm scale phase of the severe environmental storms and mesoscale experiment sesame the process leading to updraft rotation appears to follow that proposed in 1968 by fujita and grandoso whereby a middle altitude vorticity couplet formed on the downwind flanks of a strong nonrotating updraft with cyclonic vertical vorticity on the right forward flank and anticyclonic vertical vorticity on the left

the influence of the shear induced pressure gradient on thunderstorm motion abstract in the present investigation we propose a simple theory to explain how a veering environmental wind shear vector can cause an initially symmetric updraft to grow preferentially to the right of the shear vector and acquire cyclonic rotation the explanation offered is based on linear theory which predicts that interaction of the mean shear with the updraft produces favorable vertical pressure gradients along its right flank to asses the validity of linear theory for large amplitude updrafts the three dimensional shallow anelastic equations are numerically integrated using a simple parameterization for latent heating within a cloud and the linear and nonlinear forcing terms are separately analyzed these results suggest that although the nonlinear effects strongly promote splitting of the updraft the linear forcing remains the dominant factor in preferentially enhancing updraft growth on the right flank we believe this differential forcing is a major contributor to the observed predominance o

tidal transformation and resonance in a short microtidal mediterranean estuary alfacs bay in ebre delta abstract tidal and subtidal waves are analyzed with sea level data and numerical modeling in a short and micro tidal embayment alfacs bay nw mediterranean sea data analysis exhibits tidal wave amplification and seiching characteristic period of 3 5 h along the bay numerical results show an eight fold increase in quarter wave resonant wave amplitudes from the mouth to the head of the bay this amplification follows the classical description of a standing wave moreover resonant wave velocities measured and computed at the bay mouth node location are about one order of magnitude higher than tidal currents analysis of astronomic tidal propagation in the bay reveals similar behavior for diurnal and semidiurnal constituents tidal waves amplify along the bay by 3 for diurnal and 10 for semidiurnal constituents numerical simulations conducted with different domains indicate that geometric effects dominate over frictional influences in causing the wave behavior this behavior is consistent with the existence of a quasi steady standing wave within the bay

surface circulation variability in the balearic basin the balearic basin is defined as a wide region of the western mediterranean located in between the liguro provencal and algerian basins the dynamics of the liguro provencal basin in the north is dominated by the dense water formation process associated with a permanent circulation along the continental slope the northern current the algerian basin in the south is dominated by intense mesoscale eddies and their interactions with the unstable algerian current the balearic basin is a transition region between these two different dynamic regimes it includes the catalan sea located between the balearic islands and the iberian peninsula and the wide gulf of valencia in the south of this sea some new ideas about the surface circulation variability have been inferred from a series of noaa satellite advanced very high resolution radiometer images taken mainly from the autumn winter period during 1981 1988 and also from various in situ data the northern current which flows southward along the iberian peninsula slope is covered in summer by a warm surface layer spreading over the whole catalan sea this local warming creates one of the most intense thermal fronts in the western mediterranean the pyrenees front near the balearic islands the flow through the sills of recent atlantic water partially deflected by anticyclonic eddies from the algerian current creates the balearic front and contributes to its mesoscale variability this variability appears to be much more intense than previously described the balearic front is clearly recognized as the westward continuation of the north balearic front already defined in the open sea as the northern limit of the recent atlantic water reservoir finally the gulf of valencia is frequently influenced by water entering from the algerian basin which appears to be important in the disruption of the northern current and the formation of the balearic current the geostrophic flow associated with the balearic front

observing global ocean topostrophy 1 recent publications have evaluated topostrophy f v d where is f coriolis v is velocity and d is gradient of total depth as a means of comparing models circulations some results are striking comparing four global models two with modest grid size and two with fine grids merryfield and scott 2007 show that finer grid models are characterized by more positive especially at greater depths and higher latitudes among nine arctic ocean models holloway et al 2007 find in three of the models quite distinct from the other six a result shown to depend upon subgrid eddy parameterization from different choices of numerical method within the same model penduff et al 2007 show that improved numerical representations support more positive can these model results be compared with observations a global compilation has been prepared from 17120 current meter records spanning 83087 current meter months the compilation tends to confirm modeling progress achieved by finer resolution improved parameterizations and better representations a new characterization of global ocean circulation emerges with suggestive dynamical insights

hodograph curvature and updraft intensity in numerically modeled supercells abstract a set of numerical simulations of supercell thunderstorms has been carried out with a range of low level curvatures in the environmental hodograph and midlevel shears they cover a range of hodograph shape as measured by the integrated helicity of the lowest 3 km of the hodograph the peak updraft occurs in the first hour of the storms and tends to be greater for larger values of environmental helicity there is also a slight tendency for greater updraft intensity with lesser values of midlevel shear significantly air in the core of the updrafts at midlevels 5 km is not the most unstable air at the level the most buoyant air rises in a region with a downward directed pressure gradient force which slows its ascent conversely pressure gradient forces at lower levels 2 3 km accelerate less buoyant air upward into the core of the midlevel updrafts the pressure gradient force is larger in the cases with more curvature in the environmental wind than the low curvature environments this i

temporal and spatial hydrodynamic variability in the mallorca channel western mediterranean sea from 8 years of underwater glider data this study is a contribution to the pre swot project ctm2016 78607 p funded by the spanish national research program and the european regional development fund mineco feder glider data are freely available at the socib website https doi org 10 25704 jd07 sv9

influence of benthic boundary layer dynamics on wind induced currents in the ebro delta inner shelf measurements taken by two instrumented tripods deployed on the ebro delta inner shelf at 8 5 and 12 5 m depth were used to characterize low frequency currents under the action of a moderate eastern storm results show that inner shelf currents respond very rapidly to wind action with along shelf currents dominating over the across shelf ones mean along shelf velocities of 0 35 and 0 24 m s 1 at the inner and outer position respectively were recorded during the event and they were highly correlated with the along shelf wind stress the measured current profiles were used to derive wind drag coefficients assuming a balance between the along shelf components of the wind and current bottom stresses since under eastern wind events wave action in the ebro inner shelf is significantly enhanced wave current interaction processes controlling the current bottom stress and sediment mobilization can affect the current structure during the event depth averaged concentrations in the lower meter of the water column larger than 1 g l 1 were recorded that were also accompanied by the generation of vertical concentration gradients larger than 1 g l 1 m 1 when the bottom drag coefficient was obtained from velocity profiles without considering the presence of these gradients the required wind drag coefficients to fulfil the along shelf balance were much higher than the ones derived from wind data and they vary across the inner shelf however when bottom drag coefficients are obtained including stratification effects the wind drag coefficients fulfilling the along shelf balance were of the same order of magnitude as the ones derived from wind data and without any difference at both locations