CHANGES IN SEA-SURFACE HYDROLOGY ASSOCIATED WITH HEINRICH EVENT-4 IN THE NORTH-ATLANTIC OCEAN BETWEEN 40-DEGREES AND 60-DEGREES-N

The changes in distribution of sea surface temperature and salinity in the North Atlantic between 40 and 60 degrees N were reconstructed for the time interval between 40 and 30 kyr BP, which includes the large iceberg discharge event associated with the deposition of Heinrich lay er 4. We found that the meltwater input during deposition of Heinrich layer 3 resulted in a 1-2 kyr temperature decrease of about 2 degrees C and a salinity decrease in the range of 1.5 parts per thousand-3.5 p arts per thousand between 30 and 50 degrees N. Sites above 50 degrees N did not experience significant salinity variations, A much larger ar ea was affected by the reduction in sea surface temperature, The ampli tude of the sea surface temperature shift was, however, much smaller t han the atmospheric temperature changes over Greenland at GISP and GRI P sites.