Skrevet av Emne: Havnivå som temperaturproxy  (Lest 205 ganger)

PetterT

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Havnivå som temperaturproxy
« på: 07.02.2017, 14:39:43 »
En svært så aktiv nettmobber på dette forum som stadig trakasserer med begrep som "klimakuk" og "kullkuk" har så vidt jeg har registrert uttrykt noe om at havstigning kan brukes som temperaturproxy.
Ideen er så latterlig at jeg har lagt dette innlegget under skråblikk.  ;D
Det ser nå ut som om seriøs forskning har avvist en slik ide temmelig grundig, noe Notrickzone (som også blir mobbet av samme ufordragelige debattant) har publisert:

35 Scientific Papers: Global Sea Levels Were 1 – 2 Meters Higher Than Now For Most Of The Last 7,000 Years
By Kenneth Richard on 6. February 2017
CO2 Concentration Changes Do Not Drive Sea Levels
http://notrickszone.com/2017/02/06/35-scientific-papers-global-sea-levels-were-1-2-meters-higher-than-now-for-most-of-the-last-7000-years/#sthash.FWF8ONT2.dpbs
......
And casting even more doubt on the assertion that variations in CO2 drive sea level rise is the fact that there is robust paleoclimate evidence to suggest that today’s mean sea levels as well as today’s sea level rise rates are both relatively low (from a historical standpoint) and also well within the range of natural variability.  Nothing unusual is happening to sea levels today.  For even though we have evidence that modern CO2 concentrations (~405 ppm) are historically high relative to the last 10,000 years, we also possess a growing body of evidence that modern sea levels are still about 1 to 2 meters lower than they have been for most of the last 7,000 years.

The fundamental problem for the CO2-rise-causes-sea-level-rise paradigm, then, is that rising CO2 concentrations have not been correlated with rising sea levels for nearly all of the last 12,000 years.  In fact, the opposite has been observed during the last 2,000 years, or during the Late Holocene: CO2 levels have risen (gradually, then rapidly) while sea levels have fallen overall, with recent changes so modest (inches per century) that they do not override the overall trend).   In the 8,000 years before that, sea levels rose rapidly while CO2 concentrations remained flat.  Simply put, the supposed anthropogenic “signal” in sea level rise trends has largely gone undetected — a point that has been affirmed by more and more scientists.


Det er tanken som teller :-)