On the accuracy of HF radar surface current measurements: Intercomparisons with ship-based sensors

R. D. Chapman, L. K. Shay, H. C. Graber, J. B. Edson, A. Karachintsev, C. L. Trump, D. B. Ross

Research output: Contribution to journalArticle

167 Scopus citations

Abstract

High-frequency (HF) radar systems can provide periodic, two-dimensional, vector current estimates over an area approaching 1000 km2. As the use of these HF systems has gained wider acceptance, a number of attempts have been made to estimate the accuracy of such systems. However, comparisons of HF radar current estimates with in situ sensors are difficult to interpret since HF systems measure currents averaged over an area of 1 km2 and to a depth of only 50 cm while in situ sensors measure currents at a point and somewhat greater depths (1 to 10 m). Previous studies of the accuracy of HF radar technology have thus attributed the differences observed between HF radar and in situ sensors to an unknown combination of vertical shear, horizontal inhomogeneity, in situ instrument errors, and HF radar system errors. This study examines the accuracy of HF radar current measurements using data from the 1993 High Resolution Remote Sensing Experiment, conducted off Cape Hatteras, North Carolina. Data from four shipborne in situ current meters are compared with data from an Ocean Surface Current Radar (OSCR), a commercial current-measuring radar. We attempt to discern the predominant sources of error in these data by using multiple simultaneous measurements from different sensors and by examining the variation of observed current differences as a function of location. The results suggest an upper bound on the accuracy of the OSCR-derived radial currents of 7 to 8 cm/s.

Original languageEnglish (US)
Pages (from-to)18737-18748
Number of pages12
JournalJournal of Geophysical Research: Oceans
Volume102
Issue numberC8
DOIs
StatePublished - Aug 15 1997

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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