LIST OF ILLUSTRATIONS 



Figure Page 



1. Standard ART flight trackline, July 1970-June 1976 .... 1 



2. Monthly surface isotherm chart, 14, 15, 17, 21-23 



July 1970 2 



3. Monthly surface isotherm chart, 18-21 August 1970 7 



4. Monthly surface isotherm chart, 15-17, September 1970 . . 8 



5. Monthly surface isotherm chart, 13-15, 20, 21, 27 



October 1970 9 



6. Monthly surface isotherm chart, 17-19, 23, 



November 1970 10 



7. Monthly surface isotherm chart, 15-17, 18 



December 1970 11 



8. Monthly surface isotherm chart, 18-22 January 1971 12 



9. Monthly surface isotherm chart, 16-19 February 1971 .... 13 



10. Monthly surface isotherm chart, 16-19 March 1971 14 



11. Monthly surface isotherm chart, 13-16, 19 April 1971 15 



12. Monthly surface isotherm chart, 18-20, 22, May 1971 16 



13. Monthly surface isotherm chart, 15-18, 22, 24 



June 1971 17 



14. Monthly surface isotherm chart, 20-24 July 1971 18 



15. Monthly surface isotherm chart, 19, 23, 24, 26, 27, 30 



August 1971 19 



16. Monthly surface isotherm chart, 14-16, 21-23 



September 1971 20 



17. Monthly surface isotherm chart, 12, 14, 15, 26-28 



October 1971 21 



18. Monthly surface isotherm chart, 16-19 November 1971 ... 22 



19. Monthly surface isotherm chart, 14-17 December 1971 ... 23 



20. Monthly surface isotherm chart, 18-20, 25-27 



January 1972 24 



21. Monthly surface isotherm chart, 15-17, 22 



February 1972 25 



22. Monthly surface isotherm chart, 21-24 March 1972 26 



23. Monthly surface isotherm chart, 18-21 April 1972 27 



24. Monthly surface isotherm chart, 16-18, 23, May 1972 28 



25. Monthly surface isotherm chart. 13-16, 21 June 1972 29 



26. Monthly surface isotherm chart, 21-23, 26-28 July 1972 ... 30 



27. Monthly surface isotherm chart, 15-19 August 1972 31 



28. Monthly surface isotherm chart, 22, 23, 25, 27 



September 1972 32 



29. Monthly surface isotherm chart, 18, 20, 27, 29, 30 



October 1972 33 



30. Monthly surface isotherm chart, 16, 18, 19, 21, 22 



November 1972 34 



31. Monthly surface isotherm chart, 13, 14, 18-20, 



December 1972 35 



32. Monthly surface isotherm chart, 16, 17, 19, 24 



January 1973 36 



33. Monthly surface isotherm chart, 20-23 February 1973 37 



34. Monthly surface isotherm chart, 20, 22-24, 27, 28 



March 1973 38 



VII 



