Sea Surface Current Estimates Off Central California as Derived from Enhanced AVHRR Infrared Images
Sea Surface Current Estimates Off Central California as Derived from Enhanced AVHRR Infrared Images

Author: Chung-Ming Fang

Publisher:

Published: 1987

Total Pages: 51

ISBN-13:

DOWNLOAD EBOOK

A technique is presented which uses an interactive computer program to estimate sea surface current velocities from the displacement of sea surface temperature (SST) patterns apparent in enhanced sequential infrared images obtained from the NOAA-6 Advanced Very High Resolution Radiometer. This technique was applied to the surface currents of the California Current System using IR image data from 27 and 28 April 1981. This technique, which uses enhanced pseudocolor gradient imagery, produced more current vectors than an earlier technique develop by O'Hara (1987) which used unenhanced gray scale imagery. The resultant surface vectors agree well in direction but underestimate velocities obtained from Doppler Acoustic Log (DAL) measurements taken during the same period. The two methods produced closest agreement of current velocities of less than 40 cm/sec and with satellite-derived velocities obtained with sequential 12 hour images rather than sequential 24 hour images. Satellite-derived velocities in the rapid flow area (larger than 40 cm/sec) showed poor correspondence to DAL-measured velocities. The strong current shear in these areas may distort the surface SST patterns making identification of features between two images more difficult. The satellite derived surface velocities are assumed to be representative of the velocities of the upper mixed layer, which is usually 10 to 30 m deep in the study region.

Space Oceanography: An Intensive Course
Space Oceanography: An Intensive Course

Author: Arthur P Cracknell

Publisher: World Scientific

Published: 1992-09-16

Total Pages: 406

ISBN-13: 9814569364

DOWNLOAD EBOOK

The advent of Earth-observing satellites has revolutionised the gathering of oceanographic data and the visualisation of oceanographic processes. This course was for postgraduate students and young post-doctoral research workers and covered the instruments and satellite systems used to gather visible, infrared and microwave data over the oceans. It also covered the uses of these various types of data to provide information about ocean colour, biological productivity, surface temperature, currents and circulation patterns, near-surface windspeeds, bottom topography and the geoid.

Data Analysis Methods in Physical Oceanography
Data Analysis Methods in Physical Oceanography

Author: Richard E. Thomson

Publisher: Elsevier

Published: 2024-07-16

Total Pages: 892

ISBN-13: 0323993133

DOWNLOAD EBOOK

Data Analysis Methods in Physical Oceanography, Fourth Edition provides a practical reference to established and modern data analysis techniques in earth and ocean sciences. In five sections, the book addresses data acquisition and recording, data processing and presentation, statistical methods and error handling, analysis of spatial data fields, and time series analysis methods. The updated edition includes new information on autonomous platforms and new analysis tools such as “deep learning and convolutional neural networks. A section on extreme value statistics has been added, and the section on wavelet analysis has been expanded. This book brings together relevant techniques and references recent papers where these techniques have been trialed. In addition, it presents valuable examples using physical oceanography data. For students, the sections on data acquisition are useful for a compilation of all the measurement methods. Includes content co-authored by scientists from academia and industry, both of whom have more than 30 years of experience in oceanographic research and field work Provides boxed worked examples that address typical data analysis problems, including examples with computer code (e.g., python code, MATLAB code) Presents brief summaries at the end of the more difficult sections to help readers looking for foundational information