Natalya Gomez

Следствия:

Peter U Clark

Gomez received her Bachelor's Degree in Physics, with a math minor (2006), and her Master's Degree in Geophysics and Environmental Studies (2009) at the University of Toronto. Gomez earned her PhD at Harvard University in the Department of Earth and Planetary Sciences. Her thesis was on sea level and ice sheet interactions, advised by Professor Jerry X. Mitrovica.

Sea level change due to Antarctic collapse

Gomez 2010.pdf: Natalya Gomez, Jerry X. Mitrovica, Mark E. Tamisiea, Peter U. Clark

p. 625

The sea level theory adopted by Clark & Lingle (1977) was a special (elastic) case of a theory that was developed to model sea level changes associated with the Late Pleistocene ice-age cycles (Farrell & Clark 1976). However, over the last decade this “standard” theory has been extended to include rotational feedback (e.g. Milne & Mitrovica 1996, 1998; Peltier 1998; Mitrovica et al. 2005) and shoreline migration due to local changes in sea level at coastlines and/or the growth or ablation of grounded marine-based ice (e.g. Johnston 1993; Milne 1998; Milne et al. 1999; Mitrovica & Milne 2003; Mitrovica 2003; Kendall et al. 2005).

p. 630

The physics of rotational feedback is outlined in Fig. 6 and the associated caption... In our calculations, the collapse of the WAIS leads to a shift in the rotation pole of 92 m per metre of effective eustatic sea level rise (or ∼0.46 km for an EEV of 5 m)... the centre of mass of the West Antarctic is ∼10◦ from the south pole, and this displacement is clearly sufficient to drive a significant reorientation of the pole

p. 631, Fig. 6

From t0 to tj the rotation pole... assumed to have moved ... relative to the solid surface of the planet. (C) shows the difference in centrifugal potential between the two frames (B minus A) associated with the true polar wander

The sea-level fingerprints of ice-sheet collapse

2014, Carling Hay, Jerry X. Mitrovica, Natalya Gomez, Jessica Creveling

p. 62

Second, and more subtle, an off-axis ice-sheet collapse will perturb the orientation of the Earth's rotation axis (i.e., drive true polar wander, TPW) and the associated perturbation to the centrifugal potential will produce a sea-level signal (Milne and Mitrovica, 1996). In particular, the local rotation axis will reorient toward the zone of ice-sheet collapse (i.e., the South Pole will move toward the WAIS in Fig. 2A and toward the EAIS in Fig. 2C, while the North Pole will move toward the GIS in Fig. 2B), and this will lead to a spherical harmonic degree-two, order-one "quadrential" sealevel perturbation (Milne and Mitrovica, 1996;Gomez et al., 2010). The effect of this quadrential perturbation is significant.