EXPLANATION OF OCEAN TEMPERATURE CHART No. 3. 



CAKYSFOET REEF LIGHTHOUSE, FLORIDA. 



Observers : Edwakd Bell, F. A. Bkost, Maktin Weatueiu'ord. 



Location of station. — Carysfoit Reef lighthouse is located ou the outer side of Carysfort Reef, in front of Key 

 Largo, .and facing the Straits of Florida. It is about 158 miles northeasterly from the Dry Tortngas light-house. The 

 water deepens rapidly from the outer edge of the reef, attaining a depth of 50 fathoms within a distance of about 2 

 miles. The 100-fathom curve is distant about 7 miles, and the axis of the Gulf Stream about 27 miles. 



Geographical posi/ion.— Latitude, '.^5° 13' 15" N. ; longitude, 80° 12' 42" W. 



Depth of icater. — Three feet. 



JRange of temperature.— Air, t8°.5 (65°.5 to 84°) ; surface, 1.5° (71°.5 to 86°.5). 



The temperature is more equable at this station than at the Tortngas, both as regards the air and water. The 

 air temperature is relatively lower throughout the year, the maximum bejug 4i° lower at Carysfort than at the Tor- 

 tngas. The curves of surface temperature are more regular, and are very uniform for all the years, apparently indi- 

 cating that the place at which the observations were taken was well suited for the purpose, although the depth of 

 water was only 3 feet. The maximum surface temperature was practically the same at this station as at the Tortngas, 

 and exceeds the air maximum by 2°. 5. 



The low temperatures recorded at the Tortngas for March, 1881, and November 26 to December 6, 1882, were also 

 observed at this station, though in a relatively less degree, especially as regards the former period. During the first 

 part of March, 1S61, northerly and northwesterly winds prevailed, while during the latter part of the same mouth the 

 winds were variable. During the ten days ending December 6, 18P2, they were mostly from the north and northeast. 



Table showing the direction of the xtiiiids, by quadrants, for each month of the year, being the vuans office years' observations. 



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