One challenge has been that the state of the hydrological cycle is not as easily summarised by one single index in the same way as the global mean temperature or the global
mean sea level height.
Not exact matches
The
mean sea level referenced to these
height systems has been decreasing over the past decades.
A detailed body of literature is on hand — alluding to Wagner, Dürer, the measurements of the concentration camps, the geographical
height of the White Cube gallery above
sea level — to help you construct additional
meanings.
Would you care to explain further (or direct me to a reference) the bit about determining the
height relative to
mean sea level
The current hard shorelines of New York City failed us because they are too binary —
meaning that the
sea walls only protect us until the water
level reaches a certain
height where it will then overflow into the city.
Also, station
height (e.g. above
mean sea level) would probably be an important factor to try and include.
So, in theory, this measurement could be converted into a measure of the
sea surface
height, i.e., the
mean sea level.
The Finnish Meteorological Institute confirms the
height of the theoretical
mean sea level annually, using the most recent knowledge on the past and future changes of the factors affecting the
sea level.
Global
mean sea level (eg - the global average
height of the ocean) has typically been calculated from tidal gauges.
They found that what had in 1800 been the chance of the one - in -500-years flood event — 2.25 metres above
mean tidal
height — increased with time and
sea level.
Monthly temperature, precipitation, 500hPa geopotential
height,
mean sea -
level pressure and soil moisture over the entire globe are also output to assess larger scale weather systems.
The derived average storm surge
heights were then displaced upwards by the amount of global
mean sea -
level rise assumed for the 2030 and 2060 Foresight scenarios [38, 39], 10 cm and 21 cm respectively (Table 3).
«Geopotential
height» is the
height above
mean sea level for a given pressure
level.