Rising of Rising of Sea Sea LevelLevel

Bekircan İDERBekircan İDER

In the world, the sea level In the world, the sea level has been risinghas been rising about about

1.8 mm/year for the past 1.8 mm/year for the past century.century.

The most important cause The most important cause is is

you you know :)know :)

Global Warming!Global Warming!

The Earth is WarmingThe Earth is WarmingYearlyYearly Average Average Surface TemperaturesSurface Temperatures

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1880 1900 1920 1940 1960 1980 2000

°C

Year [Hansen et al., 2005]

What Causes What Causes to Change to Change Sea Sea Level?Level?

What is What is “Average“Average Sea Level Sea Level ChangeChange””??

• ““AverageAverage Sea Level Change” is Sea Level Change” is the the averageaverage height of the height of the oceansoceans..

• Sea level changeSea level changess at a specific at a specific location in the ocean may location in the ocean may getget higherhigher or or lowerlower. C. Causeausess of of differences differences are theare the ocean ocean temperature and other effects.temperature and other effects.

• Usually measured in units of Usually measured in units of millimeters (mm): 25.4 mmmillimeters (mm): 25.4 mm

GRAVITY

Measurements of Sea Level ChangeMeasurements of Sea Level Change

Altimeter: measuring height

Expansion: becoming wide Gauge: measure, size,scale

Now, thermal expansion is the primary contributor to sea level rise and in next

centuries, it will be same.

-100

-50

0

50

100

150

1880 1900 1920 1940 1960 1980 2000

MS

L (

mm

)

Year

Tide Tide ScaleScale Observations Observations

Average Rate ~ 1.8 mm/year

0.8 mm/year

2.0 mm/year

3.2 mm/year

[Church and White, 2006]

Tide: alternate rising and falling of seaObservation: investigation

Sea Level ChangSea Level Changinging is is no not Same Everywheret Same EverywhereAverage Sea Level Rise over 1993-2006Average Sea Level Rise over 1993-2006

mm/yr

These are the effects of These are the effects of Sea Level Sea Level ChangChangee

Thermal Increasing: ~1 meter

Mountain Icecap: 0.5 meters

Greenland Ice Melting: 7 meters

Antarctic Ice Melting: 60 meters

Groundwater Storage: < 0.5 meters

Is Sea Level RisIs Sea Level Risinging QuicklyQuickly??

Don’t you know?Don’t you know?

Imagine!Imagine!

Effects of Sea Level RiseEffects of Sea Level Rise

1 meter 2 meters

4 meters

8 meters

GFDL

Thanks for listening to me

THE END

Name: Bekircan İDER

Class: 201