Taxonomy term

sea level

Fossil reefs show sea level rose in bursts

Off the coast of Texas, a collection of fossil coral reefs sits under 60 meters of water — relics from 20,000 years ago, when the sea surface was much lower than today. In a new study, researchers created high-resolution maps of the reefs that suggest they drowned as sea levels rose in rapid bursts — each lasting decades to centuries — instead of at a steady rate, as has long been assumed.

06 Feb 2018

Mediterranean drawdown may have caused burst of volcanism

Between 5 million and 6 million years ago, during an event known as the Messinian Salinity Crisis (MSC), large amounts of seawater evaporated from the Mediterranean Sea leaving massive salt deposits in the basin. How much the sea surface dropped during the MSC is debated, but in a new study in Nature Geoscience, researchers suggest that a large, kilometer-scale drawdown of the Mediterranean Sea may explain not just the thick salt deposits but also a pulse of magmatic activity around the region that occurred at the same time as the MSC.

17 Jan 2018

Sea-surface temperatures during last interglacial similar to modern day

During the last interglacial period, between 129,000 and 116,000 years ago, global sea levels were 6 to 9 meters higher than at present. Scientists have long wondered how global atmospheric and ocean temperatures then compared to modern times, but efforts to reconstruct such temperatures have often fallen short. In a new study, researchers who compiled past records of sea-surface temperatures (SSTs) have revealed that SSTs during the last interglacial were similar to modern day temperatures. But, the similarity doesn’t necessarily predict a future surge in sea levels.

10 May 2017

Measuring rising seas is tricky in deltas

Earth’s stratigraphic record offers a patchwork diary of how different parts of the planet have formed and changed over time. Some of the most extensive pieces of the stratigraphic record are found in deltas, making them ideal places to look for long-term chronicles of Earth’s history, as well as clues to future changes to our coastal landscapes.

26 May 2016

How the NC-20 Succeeded

The basic motivation of the NC-20 is financial; the group is withholding information about coastal hazards from the public in order to keep area real estate and tourist markets up and running. None of the NC-20 leadership is qualified in any aspect of climate change science, but they certainly are savvy in the ways of public relations and information spinning. They are quite capable of reading the literature and exaggerating the uncertainties inherent to good science.

21 Apr 2013

Local coastal impacts underestimated from sea-level rise

Most studies indicate that sea levels will rise over the next century due to melting glaciers, more ice breaking off the Antarctic ice sheet and thermal expansion — and there is great variation in how much scientists estimate seas will rise. But that’s not even the most important question, according to a new study. Instead, researchers should be looking at relative sea-level rise — how much rising seas will affect individual regions. And when you break it down by region, the study suggests, the outlook isn’t promising.

09 Jul 2010

Raising California's Sinking Delta

Over the past century and a half, the river delta that provides Central and Southern Californians with drinking water and farmers with productive cropland has sunk about two and a half centimeters each year. Some of the delta’s islands now lie more than six meters below sea level. Two thousand kilometers of aging levees keep them dry for now, but as the land sinks, the pressure on the levees grows. Researchers at the U.S. Geological Survey in California have uncovered a way to rebuild the delta and sequester carbon in the process.

18 Nov 2008