Mean sea level

The long term changes in "mean" sea level provide basic information on the climatic role of oceans and general ocean circulation. The international scientific community is conducting studies to detect long-term trends and link them to climate change. But the global network of tide stations has significant shortcomings: the stations are not evenly distributed (concentrated in the northern hemisphere) and they are ill-suited to monitoring the general dynamics of the oceans. To achieve this goal, specific tide gauges must be installed and used in conjunction with highly precise satellite positioning systems (GPS, DORIS), which will monitor the geodesic stability of the base that the gauges are based on.

 

Îlot à proximité de Saint-Malo avec les traces de différents niveaux de la mer (crédit SHOM 2012) Cliquez sur la figure pour l'agrandir

 

It is generally accepted that the global sea level is rising by about 1 to 2 mm per year, but estimates of the rate of increase differ significantly according to the authors. This is because the exact causes of the rise are not known, and in particular, what portion can be attributed to the g17d79830f[ertcobinMnd they arobinMnde differ ease dued (levcarb.shoi dde northeratmo and tnternaTopex Poseid.shpartJas.shte positibe ffer lsede ffnre notmeteepeater year, but eribtwf[e 1993hpart2000stimatal, se differ , swn, s ction=thepeghoglobal tild's. To actatiorot knoiqucientisignifa>

 

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