Is locked-in error due to peculiar truncation errors in the implied vorticity equations

"In designing finite difference forms for the primitive equations of motion, Shuman and Stackpole (1969) indicated the importance of certain peculiar errors in the implied vorticity equation. I am raising in this paper further questions about the implied vorticity equation. How important is its form? Locked-in error might be regarded as a result of poor handling and development of vorticity. Is this error caused by peculiar errors in the implied vorticity equation"--Introduction. Frederick G. Shuman. "Sept 1977." "This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members." System requirements: Adobe Acrobat Reader. Includes bibliographical references (page 3). 1977 NWS (National Weather Service) Library Public Domain 1931