Afstemning mellem tidvandsmålinger og satellitmålinger

With more time and resources, it would be interesting to find areas where both altimeters have measurements equally close to the tide gauge. Distance has a big impact on the accuracy of the altimeter measurements, so equalising the comparison distance ensures that no altimeter gets an unfair advantage. It would be even better to find a coastal location, where the two satellite tracks cross each other. Placing a tide gauge directly on the intersecting point would be very interesting, as both altimeters would have an e↵ective distance of 0 metres to the tide gauge, thus giving opportunity to achieve the best possible comparison. By updating the mesh resolution of the tide model, greater accuracy could be achieved in areas with intricate coastlines like Darwin.

kfl skrev:
Min konklusion er vandstandsmålinger fra satellitter og fra tidevandsstationer er korrelerede og viser det samme.

Min konklusion er vandstandsmålinger fra satellitter og fra tidevandsstationer er korrelerede og viser det samme

Then, in a study published last August, Frederikse et al. (2020) assessed global sea level rise rates and its sum of contributors since 1900. Interestingly, they found the rates of sea level rise were effectively the same for the entire 1900 to 2018 period (1.56 mm/yr−¹) as they were from 1958-2014 (1.5 mm/yr−¹)...

The rate of global-mean sea-level rise since 1900 has varied over time, but the contributing factors are still poorly understood1. Previous assessments found that the summed contributions of ice-mass loss, terrestrial water storage and thermal expansion of the ocean could not be reconciled with observed changes in global-mean sea level, implying that changes in sea level or some contributions to those changes were poorly constrained2,3. Recent improvements to observational data, our understanding of the main contributing processes to sea-level change and methods for estimating the individual contributions, mean another attempt at reconciliation is warranted. Here we present a probabilistic framework to reconstruct sea level since 1900 using independent observations and their inherent uncertainties. The sum of the contributions to sea-level change from thermal expansion of the ocean, ice-mass loss and changes in terrestrial water storage is consistent with the trends and multidecadal variability in observed sea level on both global and basin scales, which we reconstruct from tide-gauge records. Ice-mass loss—predominantly from glaciers—has caused twice as much sea-level rise since 1900 as has thermal expansion. Mass loss from glaciers and the Greenland Ice Sheet explains the high rates of global sea-level rise during the 1940s, while a sharp increase in water impoundment by artificial reservoirs is the main cause of the lower-than-average rates during the 1970s. The acceleration in sea-level rise since the 1970s is caused by the combination of thermal expansion of the ocean and increased ice-mass loss from Greenland. Our results reconcile the magnitude of observed global-mean sea-level rise since 1900 with estimates based on the underlying processes, implying that no additional processes are required to explain the observed changes in sea level since 1900.

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Hvilket jo er dejligt

Sea level rise is both a powerful impact of and indicator for global warming and climate change. Observing sea level change, as well as its causes, is therefore a top priority for scientists and society at large. By measuring the ocean's temperature, salinity, mass, and surface height, the relative sources of recent sea level rise can be discerned. With these observations, sea level change is determined in terms of total sea level and its two major components, ocean mass and steric (density-related) sea level. The sea level budget is closed when the sum of the independent components agrees with measurements of total sea level, indicating that the observations can be used to interpret the causes of sea level change. While nearly global monitoring of sea level from space-based radar altimeters has been available since the early 1990s, satellite gravity missions capable of weighing changes in ocean mass have been available for less than 10 years. Even more recently, the Argo array of profiling floats achieved a level of coverage that now allows assessment of global sea level change due to temperature and salinity in the upper 2,000 m of the ocean. Only during the overlapping period of all three observing systems can the sea level budget be directly addressed by observations.

Dette burde stopper al diskussion -----

Kosmos skrev:

Min konklusion er vandstandsmålinger fra satellitter og fra tidevandsstationer er korrelerede og viser det samme

- mere om stigende vandstand:

Then, in a study published last August, Frederikse et al. (2020) assessed global sea level rise rates and its sum of contributors since 1900. Interestingly, they found the rates of sea level rise were effectively the same for the entire 1900 to 2018 period (1.56 mm/yr−¹) as they were from 1958-2014 (1.5 mm/yr−¹)...

Peter Villadsen skrev:

Kosmos skrev:

Min konklusion er vandstandsmålinger fra satellitter og fra tidevandsstationer er korrelerede og viser det samme

- mere om stigende vandstand:

Then, in a study published last August, Frederikse et al. (2020) assessed global sea level rise rates and its sum of contributors since 1900. Interestingly, they found the rates of sea level rise were effectively the same for the entire 1900 to 2018 period (1.56 mm/yr−¹) as they were from 1958-2014 (1.5 mm/yr−¹)...

Det er der da ikke meget sprængstof (ny information) i!!

As a result of global warming, the world's oceans have risen by an average of around 3 mm a year since the early 1990s.

According to the new calculations, the average acceleration between 1991 and 2019 was 0.1 mm/year2

delphi skrev:
Det var alligevel noget!

As a result of global warming, the world's oceans have risen by an average of around 3 mm a year since the early 1990s.

Og

According to the new calculations, the average acceleration between 1991 and 2019 was 0.1 mm/year2

Eller dvs. at for 30 år siden i 1990 var havvandsstigningen 0 mm/year.

Ja en forskning der fuldstændig har tabt alt realitetssans.

Peder Kruse skrev:
@Peter Villadsen

benægtelse er tabet af realitetssans.
Den er ikke længere

delphi skrev:
30 X 0,1 = 3 mm. Længere er den ikke - BomBummelum.

Nej det må jo være værre end det. Det er jo en acceleration på 0,1 mm årligt. Så må denne gælde: Strækning/stigning = 1/2 * a * t^2 + begyndelses hastigheden.

Hvis stigningen i 1990 var 1 mm/år:

Stigning efter 30 år = 1/2 *0,1 * 30^2 + 1 = 5,5 MM/år

Læs forskningen, læs om usikkerhed på havstigninger og bliv klogere på, hvad vi egentligt ved og ikke ved om dette emne.

delphi skrev:

Læs forskningen, læs om usikkerhed på havstigninger og bliv klogere på, hvad vi egentligt ved og ikke ved om dette emne.

Skulle det så være sådan noget som det populistiske bras inde fra DTU??

Peter Villadsen skrev:
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Stillehavsøerne synker ikke i havet som de ellers skulle ifølge dommedagsprofetierne om kraftigt stigende havniveauer.

https://klimarealisme.dk/2020/09/08/oeer-synker-ikke/

delphi skrev:

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delphi skrev:

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