Abstract
Within the last decade the Doppler anomaly retrieved from the Synthetic Aperture Radar (SAR) has been demonstrated to be a useful resource for detection of ocean surface currents. As with any Doppler-based method, only the component along the instrument look direction can be retrieved at a time. It is here demonstrated how a time-averaged two-dimensional surface current field can be obtained from corresponding averages of surface current components detected along two non-orthogonal view angles, from respectively ascending and descending passes of the Envisat satellite. By a quantitative assessment of the involved uncertainties, an improved surface current field is obtained by merging the Doppler current with geostrophic current calculated from a climatological Mean Dynamic Topography.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsReferences
Chapron B, Collard F, Ardhuin F (2005) Direct measurements of ocean surface velocity from space: interpretation and validation. J Geophys Res 110:C07008. doi:10.1029/2004JC002809
Hansen MW, Collard F, Dagestad K-F, Johannessen JA, Fabry P, Chapron B (2011a) Retrieval of sea surface range velocities from Envisat ASAR Doppler centroid measurements. IEEE Trans Geo R Sens 49(10):3582–3592. doi: 10.1109/TGRS.2011.2153864
Hansen MW, Johannessen JA, Dagestad K-F, Collard F, Chapron B (2011b) Monitoring the surface inflow of atlantic water to the norwegian sea using Envisat ASAR. J Geophys Res. doi:10.1029/2011JC007375
Johannessen JA, Chapron B, Collard F, Kudryavtsev V, Mouche A, Akimov D, Dagestad K-F (2008) Direct ocean surface velocity measurements from space: improved quantitative interpretation of Envisat ASAR observations. Geophys Res Lett 35:L22608. doi:10.1029/2008GL035709
Mouche A, Collard F, Chapron B, Dagestad K-F, Guitton G, Johannessen J, Kerbaol V, Hansen MW (2012) On the use of Doppler shift for sea surface wind retrieval from SAR. IEEE Trans Geo R Sens 50(7):2901–2909
Rio MH, Guinehut S, Larnicol G (2011) The new CNES-CLS09 global mean dynamic topography computed from the combination of GRACE data, altimetry and in situ measurements. J Geophys Res-Oceans. doi:10.1029/2010JC006505
Romeiser R, Thompson DR (2000) Numerical study on the along track interferometric radar imaging mechanism of oceanic surface currents. IEEE Trans Geosci Remote Sens 38:446–458
Romeiser R, Thompson D (2001) Study on concepts for radar interferometry from satellites for ocean and land applications, Final report of the KoRIOLiS project. http://www.ifm.zmaw.de/projectsites/bmbf-finanziert/beginn-2001/koriolis/
Rouault MJ, Mouche A, Collard F, Johannessen JA, Chapron B (2010) Mapping the Agulhas current from space: an assessment of ASAR surface current velocities. J Geophys Res 115:C10026. doi:10.1029/2009JC006050
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Copyright information
© 2013 The Author(s)
About this chapter
Cite this chapter
Dagestad, KF., Hansen, M.W., Johannessen, J.A., Chapron, B. (2013). INCUSAR—A Method to Retrieve Temporal Averages of 2D Ocean Surface Currents from Synthetic Aperture Radar Doppler Shift. In: Remote Sensing Advances for Earth System Science. SpringerBriefs in Earth System Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-32521-2_7
Download citation
DOI: https://doi.org/10.1007/978-3-642-32521-2_7
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-32520-5
Online ISBN: 978-3-642-32521-2
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)