Thursday, 6 August 2020

SEA LEVEL RISE

A study of the Newlyn (UK) sea level measurements discusses how different instruments and different time frames give totally different trends. The text states:
 

“The record of monthly MSL [Mean Sea Level] at Newlyn during the past century shows that the average increase of MSL for the complete record and for the recent period 1993–2014 are 1.8mm/year [tidal gauge]) and 3.8 mm/year [satellites]* respectively. (we use 1993 somewhat arbitrarily for the start of the modern era in sea level monitoring as that was when precise altimeter information from space became available). 

High rates of sea level increase were observed in previous 22-year periods, including those centred on approximately 1926, 1950, and 1980 (with rates of approximately 3 mm/year), with the lowest rates centred on 1934 and 1968 (approximately 0 mm/year), with such accelerations and decelerations in the record similar to those seen in other parts of the world (Woodworth et al. 2009b). The variability and long-term trend in the Newlyn MSL record are similar to those at Brest (W√∂ppelmann et al. 2006), although some differences become apparent in a detailed comparison (Douglas 2008), and at other stations in the North Sea area (Wahl et al. 2013). 

*The noticeable difference in rate (a ratio of at least 1:2) between the two data sets still has no broadly accepted explanation. 
 

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