Expert i homogeniseringer/Variable Variability

Homogenization
Homogenization is necessary because much has happened in the world between the French and industrial revolutions, two world wars, the rise and fall of communism, and the start of the internet age. Inevitably many changes have occurred in climate monitoring practices.

As a consequence, the instruments used to measure temperature have changed, the screens to protect the sensors from the weather have changed and the surrounding of the stations has often been changed and stations have been moved in response. These non-climatic changes in temperature have to be removed as well as possible to make more accurate assessments of how much the world has warmed.

Removing such non-climatic changes is called homogenization. For the land surface temperature measured at meteorological stations, homogenization is normally performed using relative statistical homogenizing methods. Here a station is compared to its neighbours. If the neighbour is sufficiently nearby, both stations should show about the same climatic changes. Strong jumps or gradual increases happening at only one of the stations indicate a non-climatic change.

If there is a bias in the trend, statistical homogenization can reduce it. How well trend biases can be removed depends on the density of the network. In industrialised countries a large part of the bias can be removed for the last century. In developing countries and in earlier times removing biases is more difficult and a large part may remain. Because many governments unfortunately limit the exchange of climate data, the global temperature collections can also remove only part of the trend biases.

Det er derimod let at konstatere, at den opvarmning, som der sket siden starten af den industrielle revolution, har været en stor fordel for såvel planter, dyr som mennesker.

Jørgen Petersen skrev:
Det brændte areal falder og falder årti efter årti.

delphi skrev:

Jørgen Petersen skrev:
Det brændte areal falder og falder årti efter årti.

Og det samme gør antallet af dræbte dyr!

delphi skrev:
Der er en direkte sammenhæng mellem antallet af døde dyr og det areal af skove som brænder - mon ikke!

delphi skrev:
Klimafolket ejer ikke evnen til at se proportioner: Hvor mange dyr mon der dør i naturen, når de forskellige fødekæder 'eksekverer', som når katten æder musen.

Peter Villadsen skrev:

delphi skrev:
Klimafolket ejer ikke evnen til at se proportioner: Hvor mange dyr mon der dør i naturen, når de forskellige fødekæder 'eksekverer', som når katten æder musen.

Eksempler på manglende proportioner/benægtelse:

1 zeta joule er da ingenting.
1 grad er da ingenting
Der er da stort set ingen is smeltet i Arktis
150 millioner pattedyr døde er da ingentin.
Der afsættes ingen varme i oceanerne under 700 meters dybde
Den konstante afsættelse af varme i oceanerne er ingenting.

Osv. osv