PREFACE 



This bulletin is No. 47 in the series of annual reports on the Inter- 

 national Ice Patrol Service in the North Atlantic Ocean and covers 

 the season of 1961. It is divided into two parts. The first is a report 

 of the observation operations which extended from 23 February to 28 

 June 1961. Ship, aircraft and connnuiiication activities are described 

 and special sections deal with observed monthly ice conditions and 

 statistics on ice and sea temperature reports for 1961. 



The second part comprises a preliminary presentation of the oceano- 

 graphic data collected during 1961. Included are charts of dynamic 

 topography of the sea surface (ocean current maps), tables of oceano- 

 graphic data, a brief discussion of the results of the season's four 

 oceanographic surveys, the postseason research cruise in the Labrador 

 Sea and a report of the results of a program for collection of current 

 data using moored current meters. 



The authors of the section on oceanography are Floyd M. Soule, 

 Oceanographer, USCG, Alfred P. Franceschetti, Oceanographer, 

 USCG'^and Lt. R. M. O'Hagan, USCGR. The remainder was 

 written by Capt. R. P. Bullard, USCG, Lt. Comdr. R. E. Lenczyk, 

 USCG and Lt. P. A. Morrill, USCG. 



VII 



