However, detecting acceleration is difficult because of (i) interannual variability in GMSL largely driven by changes in
terrestrial water storage (TWS)(7 ⇓ — 9), (ii) decadal variability in TWS (10), thermosteric sea level, and ice sheet mass loss (11) that might masquerade as a long - term acceleration over a 25 - y record, (iii) episodic variability driven by large volcanic eruptions (12), and (iv) errors in the altimeter data, in particular, potential drifts in the instruments over time (13).
Adding together the observed individual components of sea level rise (thermal expansion of the ocean water, loss of continental ice from ice sheets and mountain glaciers,
terrestrial water storage) now is in reasonable agreement with the observed total sea - level rise.
Girotto M., G. J. M. DeLannoy, R. H. Reichle, M. Rodell, C. Draper, S. N. Bhanja and A. Mukherjee (May 2017): Benefits and pitfalls of GRACE data assimilation: A case study of
terrestrial water storage depletion in India.
This discussion suggests three important conclusions: (i) the effect of changes in
terrestrial water storage on sea level may be considerable; (ii) the net effect on sea level could be of either sign, and (iii) the rate has increased over the last few decades (in the assessment of Gornitz et al. (1997) from near zero at the start of the century to 0.8 mm / yr in 1990).
«This newly discovered link between polar motion and global - scale
terrestrial water storage variability has broad implications for the study of past and future climate,» the authors write.
Ice, cloud and
terrestrial water storage are variable on decadal to millennial scales at least.
H: «Detecting anthropogenic footprints in sea level rise» I: «Model estimates of sea - level change due to anthropogenic impacts on
terrestrial water storage» J: «Is anthropogenic sea level fingerprint already detectable in the Pacific Ocean?»
The graph shows the sources of the rise in sea level: the Greenland ice sheet; the Antarctica ice sheet;
terrestrial water storage; glaciers; thermal expansion.
Not sure what you mean regarding treatment of anthropogenic
terrestrial water storage (TWS) changes in AR4.
Likewise, Cazenave 2014 had published according to altimetry data, sea level had decelerated from 3.5 mm / yr in the 1990s to 2.5 mm / yr during 2003 - 2011, and that deceleration could be explained by increased
terrestrial water storage, and the pause in ocean warming reported by Argo data.
Not exact matches
But rather than throw the proverbial baby out with the bath
water, it is important to understand the true extent of carbon sequestered in
terrestrial ecosystems, in order to discount this
storage appropriately in comparison to geologic
storage.
I am not suprised there are differences of magnitude in the estimates of ground
water /
terrestrial storage contribution to sea level.
For example, the projected increase in extremely low precipitation and extremely high temperature during spring and autumn has substantial implications for snowpack
water storage, wildfire risk, and
terrestrial ecosystems (47).