N. Valencic, E. Speiser, E. Doi, E. T. Lee, B. Ford, A. Hatzius, D. Komaravalli, B. Erdmann, W. Hawley, J. X. Mitrovica
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True Polar Wander Driven by Artificial Water Impoundment: 1835–2011
Artificial water impoundment contributed significantly to global mean sea level change during the 20th century and is included in recent studies of the budget of 20th century true polar wander (TPW). We adopt a recent global database of water impoundment that accounts for 72% of an integrated global volume estimate and compute the associated TPW path from 1835 to 2011 CE. We find a highly non-monotonic pole path, with an integrated path length of 113.4 cm, a net displacement of 20.5 cm in the direction 103.4°E from 1835 to 1954 CE and 57.1 cm in the direction −117.5°E from 1954 to 2011. Across the first half of the 20th century, the mean rate of TPW was 0.30 cm/yr, while in the second half of the century it was 0.95 cm/yr. Finally, we demonstrate that the 28% of the total global water impoundment missing in our database likely had a negligible impact on polar motion.
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Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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