Seasonal Characteristic and Long-term Trend of the SST in the North Atlantic Ocean

The seasonal characteristic and long term trend of SST (Sea Surface Temperature) in the North Atlantic Ocean was analyzed by using the SST data from Hadley and HadISST. The results showed that the SST in August and October is higher (about 5 ℃) than that in February and May. The SST gradually decreased from low latitudes to high latitudes,in the Arctic reached the minimum; Waters in low latitudes,the same latitude SST ocean west bank is higher than the ocean east coast,in the high- latitude waters,the same latitude SST is the east coast of the ocean above the ocean the West Bank. Annual,summer,winter SST in the North Atlantic Ocean has obviously increasing trend from 1870 to 2009,of about 0. 003 4,0. 004 8,0. 002 7 ℃ / a. SST in the North Atlantic Ocean has obviously periods of 2. 09- 2. 25,2. 73- 3. 00,3. 46- 3. 75 years and long periodic oscillation larger than 45 years.