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SEA LEVEL RISE

SEA LEVEL RISE.

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SEA LEVEL RISE

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  1. SEA LEVEL RISE

  2. The term “sealevel” can have a lotofmeaningsdepending on the contextwhereitisused. Firstlyitisnecessarytodistinguishbetween a global averagesealevelthatisobtainedthoughanaverageofmeasurements in a very wide area or even in all the oceanicsurface, and a localsealevel, relatedto a smallarea (forexample the GulfofNaples)

  3. Ifwethinkofwhat the seahasalwaysmeantedfor man, sinceprehistorictimes, wehaverealized, thatthiscaracteristicelementofourcountryhas a geographic and environmentalimportance: as source ofaliments and businesses, incomparablescenicattraction. The researchabout the seabed, the sea water and the movementshavehad a big development in recenttimeswithexpeditionsorganisedbyscientificinstitutions in variouscountries ( USA, Russia, France, Japan, Italy…). The marine hydrosphereissubjecttonumerousmovementsthat are veryweak in comparisonwith the dimensionsof the surfaces.

  4. CAUSES -Waves -Tides -Currents

  5. At a local scale, short-termvarations (daily, monthly and annal) are possiblecausesrelatedto the weather and sea (tides, winds) changes in atmosphericpressure. The oscillations can alsoleadto the risingof the sealevel, as in the case ofVenice.

  6. THE MEDITERRANEAN  The sea temperatures have extremes between 10°c and 32°c.Some  studies estimate a mean rise of the Mediterranean temperatures of  6°c between 2070 and 2100.

  7.  In the Mediterranean the rise during the last century was like the global average but below   the global one. Infact ours is an enclosed sea and the growing warming "could induce an increase of the evaporation of  the basin which in turn could cause a slight deceleration of the sea level growth "

  8. The Mediterranean sea level risks a rise of 15-20 cm by 2050 and of 25-30 cm by the end of the century.  VARIABILITY OF THE SEA LEVEL IN DIFFERENT AREAS OF THE  BASIN DETERMINED BY CURRENTS:  - VENICE  - SOUTHERN   VENETO  - MONFALCONE-RAVENNA  -LEVANTE LIGURE  -HIGH TUSCANY -MAREMMA  -ROME  -EASTERN SICILY

  9.   According to geological theory, in antiquity Sicily was part of the mainland. This idea is supported by the fact that the Peloritan mountains of Sicily are of the same rock as those of Calabria , thus the separation of Sicily was probably due to rising sea level.

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