As reported by CO2 Science: (link)
Baur, O., Kuhn, M. and Featherstone, W.E. 2013. Continental mass change from GRACE over 2002-2011 and its impact on sea level. Journal of Geodesy 87: 117-125. (Link)
The authors write that "present-day continental mass variation as observed by space gravimetry reveals secular mass decline and accumulation," and that "whereas the former contributes to sea-level rise, the latter results in sea-level fall." Therefore, they state that "consideration of mass accumulation (rather than focusing solely on mass loss) is important for reliable overall estimates of sea-level change."
Over the nine years of their study, the three researchers report that the mean GIA-adjusted mass gain andmass loss in the 19 areas of their primary focus amounted to -(0.7 ± 0.4 mm/year) of sea-level fall and +(1.8 ± 0.6) mm/year of sea-level rise, for a net effect of +(1.1 ± 0.6) mm/year. Then, to obtain a figure fortotal sea-level change, they added the steric component of +(0.5 ± 0.5) mm/year, which was derived by Leuliette and Willis (2011), to their net result to obtain a final (geocenter neglected) result of +(1.6 ± 0.8) mm/year and a final (geocenter corrected) result of +(1.7 ± 0.8) mm/year.
The final geocenter-corrected result of Baur et al. is most heartening, as Chambers et al. (2012) indicate that "sea level has been rising on average by 1.7 mm/year over the last 110 years," as is also suggested by the analyses of Church and White (2006) and Holgate (2007). Concomitantly, the air's CO2 concentration has risen by close to a third. And, still, it has not impacted the rate-of-rise of global sea level!
|Prof Will FeatherstoneBSc (hons1), DPhil (oxon), FRAS, FRICS|