what is the definition of "land to sea ratio" when speaking about meteorology?

Answer 1

This refers to the amount of land versus the amount of sea that covers the earth.
A ratio is a fractional equation that show what part (percentage) of a thing each faction represents. example:
in your family there is one mother/one father/three girls/two boys therefore the ratio of girls to boys would be

4 to 3 it is written as: 4:3 in order for a ratio to make sense you MUST know what each side of the : represents

Answer 2

It relates to the sea level compared to the land. Whether or not the levels of the ocean have risen or dropped.