Sea slope

The red and blue dots show values of mean sea level (MSL) measured with respect to national datums in the US and Canada (red and blue, respectively). These data indicate that the height of the sea increases travelling north from Florida to Canada. However, most modern numerical models of ocean circulation (black dots) suggest that the slope of the sea should actually decrease travelling north and can be explained by the effects of the Gulf Stream in this region of the Atlantic Ocean. The new geoid from ESA’s GOCE gravity mission has resolved this long-debated mystery by providing conclusive proof that the height of the sea does, indeed, drop (yellow dots).