What is eustatic changes?
Eustatic Changes Eustatic refers to worldwide variations of sea level resulting from climate (and so hydrological cycle) change. For example, during an Ice Age more precipitation falls as snow.
What is relative sea level change?
Relative sea level change refers to how the height of the ocean rises or falls relative to the land at a particular location. In contrast, absolute sea level change refers to the height of the ocean surface above the center of the earth, without regard to whether nearby land is rising or falling.
Why are eustatic sea levels rising?
Factors that affect eustatic sea level are large scale events: tectonic activity shrinking or growing the area of world oceans, a rise in temperatures causing thermal expansion of water, or large ice sheets melting and adding water to the oceans are the three most commonly discussed.
What is the difference between eustatic sea level changes and relative sea level changes?
Relative sea level (abbreviated as RSL) is defined as the sea level that is observed with respect to a land-based reference frame. It is often contrasted with eustatic sea level, which is a measure of the total mass or volume of the oceans.
What is the difference between eustatic and relative sea level quizlet?
What is the difference between eustatic and relative sea level? Eustatic refers to the global sea level; relative refers to local sea level near land.
What could cause a large change in eustatic sea level?
How is eustatic different from isostatic sea level changes?
Isostatic Change When the height of the land increases, the sea level falls and when the height of the land decreases the sea level rises. Isostatic change is a local sea level change whereas eustatic change is a global sea level change. During an ice age, isostatic change is caused by the build up of ice on the land.
How do global eustatic sea levels change during a glacial period and why?
This is eustatic sea level change: the water is locked up in ice sheets, instead of in the oceans. Tectonically stable places far away from places with high ice volumes during the Last Glacial Maximum are called far field sites, because they had no isostatic depression during the last glaciation[7].
What is relative sea level versus eustatic sea level and what causes them?
It is often contrasted with eustatic sea level, which is a measure of the total mass or volume of the oceans. Relative sea level can change by the processes changing eustatic sea level (e.g. ice melt and thermal expansion), but also by changes on land such as subsidence and isostatic rebound.
What could cause the eustatic sea level to change?
Eustatic sea level changes are global sea level changes related to changes in the volume of water in the ocean. These can be due to changes in the volume of glacial ice on land, thermal expansion of the water, or to changes in the shape of the seafloor caused by plate tectonic processes.
What are the two main ways eustatic sea level can change select 2 answers?
Differences of eustatic sea level are caused by three main factors:
- Changes in total ocean water mass, for instance, by ice sheet runoff.
- Changes in the size of the ocean basin, for instance, by tectonic seafloor spreading or by sedimentation.
- Density changes of the water, for instance, by thermal expansion.