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PACIFIC SEA LEVELS RISING VERY SLOWLY AND NOT ACCELERATING

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Parker A., Ollier C.

Quaestiones Geographicae

2019

vol. 38

issue 1

179-184

Over the past decades, detailed surveys of the Pacific Ocean atoll islands show no sign of drowning because of accelerated sea-level rise. Data reveal that no atoll lost land area, 88.6% of islands were either stable or increased in area, and only 11.4% of islands contracted. The Pacific Atolls are not being inundated because the sea level is rising much less than was thought. The average relative rate of rise and acceleration of the 29 long-term-trend (LTT) tide gauges of Japan, Oceania and West Coast of North America, are both negative, −0.02139 mm yr−1 and −0.00007 mm yr−2 respectively. Since the start of the 1900s, the sea levels of the Pacific Ocean have been remarkably stable.

COLDSPOT OF DECELERATED SEA-LEVEL RISE ON THE PACIFIC COAST OF NORTH AMERICA

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Parker A.

Quaestiones Geographicae

2016

vol. 35

issue 3

31-37

We show here the presence of significant “coldspot” of sea level rise along the West Coast of the United States and Canada (including Alaska). The 30-years sea level for the area are mostly falling also at subsiding locations as San Francisco and Seattle where subsidence is responsible for a long term positive rate of rise. The 20 long term tide gauges of the area of length exceeding the 60-years length have a naïve average rate of rise –0.729 mm/year in the update 30-Apr-2015, down from –0.624 mm/year in the update 14-Feb-2014. Therefore, along the West Coast of the United Statesand Canada the sea levels are on average falling, and becoming more and more negative.

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2 Quaestiones Geographicae

1 2019

1 2016

2 Parker A.

1 Ollier C.

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PACIFIC SEA LEVELS RISING VERY SLOWLY AND NOT ACCELERATING

COLDSPOT OF DECELERATED SEA-LEVEL RISE ON THE PACIFIC COAST OF NORTH AMERICA