APPENDIX A: PETTERSSON 



— l8 



the isobars in the northern Norwegian Sea reveal the constant recurrence of such 



météorologie phenomena. 



Correspond- xhe hydrographic anomaly of 1902 — 1903 with its characteristic postponement of 



^drographLf t^c Atlantic flooding and formation of an extensive warmwaterarea in the northern 



andmeteoroiog-]vs[orwegian Sea, is not unprecedented. The mean atmospheric temperature of the pre- 



"in the winter Ceding Warm- winter 1 897 — 1898 for Scandinavia (Stockholm) was December 3°-i, January 



1897-98 4°.j^ March 2°-i C. above the normal. The hydrographic state of this year too was 



characterized by the formation during the cold season of a warmwater area in the 



Jairoar 1903 



rêbruar 1903 



JaraiM- 1904. 



Fig. 12. Mean monthly isobares 



northern Norwegian Sea^ The accompanying sketches (Fig. 13 and 14, p. 19) show the 

 relation of hydrographic and météorologie phenomena of that year. 



It is noteworthy, that the winterfisheries of the Scandinavian coast failed both years. 

 This was the case with the Lofoten cod-fishery, and also with the herring-fishery at Bergen 

 and in the Skager Rak. 



December 1895, the warm-winter next precedent, was noted by an exceptionally 

 high level of the Atlantic water in the Skager Rak. This winter too the previously abundant 

 winter-fishery of herring at the coast of Bohuslän ceased. 



I Observation of the oceanic temperature between the south apex of Greenland and the Orkneys and 

 between Norway and Spitzbergen in November 1897 as well as of the distribution of atmospheric pressure 

 in January 1898 occasioned the prognostication of these matters, which appeared in the periodical "Ymer" 

 for 1898, Heft 2, p.. 180, and Heft 3, p. 244. 



