Editing Sea level (section)

=== {{anchor|Short term and periodic changes}}Short-term and periodic changes ===
[[File:Global sea levels during the last Ice Age.jpg|thumb|The [[Last Glacial Period]] caused a much lower global sea level.]]
[[File:Glaciers and Sea Level Rise (8742463970).jpg|thumb|Warming temperatures and melting glaciers are currently raising the sea level.]]

Many factors can produce short-term changes in sea level, typically within a few metres, in timeframes ranging from minutes to months:

{|
|-
! colspan="3" style="background:lightgrey;"| Periodic sea level changes
|-
| Diurnal and semidiurnal astronomical tides || 12–24 h P || 0.1–10+ m
|-
| Long-period tides || 2-week to 1-year P || <0.1 m
|-
| Pole tides ([[Chandler wobble]]) || 14-month P || 5 mm
|-
! colspan="3" style="background:lightgrey;"| Meteorological and oceanographic fluctuations
|-
| Atmospheric pressure || Hours to months || −0.7 to 1.3 m
|-
| Winds ([[storm surge]]s) || 1–5 days || Up to 5 m
|-
| [[Evaporation]] and [[Precipitation (meteorology)|precipitation]] (may also follow long-term pattern) || Days to weeks || <0.1m
|-
| [[Ocean surface topography]] (changes in water [[density]] and currents) || Days to weeks || Up to 1 m
|-
| [[El Niño]]/[[southern oscillation]] || 6 mo every 5–10 yr || Up to 0.6 m
|-
! colspan="3" style="background:lightgrey;"| Seasonal variations
|-
| Seasonal water balance among oceans (Atlantic, Pacific, Indian) || 6 months || &nbsp;
|-
| Seasonal variations in slope of water surface || 6 months || &nbsp;
|-
| River runoff/floods || 2 months || 1 m
|-
| Seasonal water density changes (temperature and [[salinity]]) || 6 months || 0.2 m
|-
! colspan="3" style="background:lightgrey;"| Seiches
|-
| [[Seiche]]s (standing waves) || Minutes to hours || Up to 2 m
|-
! colspan="3" style="background:lightgrey;"| Earthquakes
|-
| [[Tsunami]]s (catastrophic long-period waves) || Hours ||  0.1–10+ m
|-
| Abrupt change in land level || Minutes || Up to 10 m
|}