Showing posts with label 16-foot Waves. Show all posts
Showing posts with label 16-foot Waves. Show all posts

Thursday, July 31, 2014

Cow Tongues May Be Damaging the Past


It’s 4 a.m. in the Nicaraguan frontier town of El Ayote. The kitchen chimney smoke and exhaust fumes combine with the dangling lights to give the main street an eerie vibe. Rumbling buses packed to the roof start their journey southwest to cross the mountains that mark the Nicaraguan watershed. Archaeologist and National Geographic Society/Waitt grantee Alexander Geurds maneuvers his pick-up truck in the sticky heat, past the buses, and heads into the opposite direction towards the lush vegetation of the Caribbean lowlands.

After about an hour of bouncing up and down on the unpaved path, Geurds crosses the river and arrives at an extraordinary location. Days before, Geurds and his team had discovered a pre-Hispanic settlement marked by numerous ancient sculptures; most of them still close to where indigenous people had carefully placed them some 600 or even possibly even 1,000 years ago. No one knows for sure how long they have been here or who created these magnificent sculptures. They are meticulously carved with mysterious designs depicting humans and animals. Who or what might these statues represent? Gods? Ancestors? Local elites?


This area of Nicaragua, one of the least accessible areas in Central America, was previously assumed to be devoid of any form of pre-Hispanic settlements. Now Geurds is investigating whether this site leads to a pattern of long forgotten settlements. The place is in remarkably good shape, the sculptures peacefully lying in grassy fields, as if forgotten by time. Only some occasional curious cow licking seems to have potentially damaged the sculptures. There is no direct evidence of looting, and only slight damage due to heat and moisture.

However, this could change from one day to the other since professional looters, continuously active in the region, are never far away. For now, an attentive landowner is keeping them at bay.


Evidence shows that the statues, each weighing a few tons, were hauled from a rock quarry somewhere in the surrounding landscape. Where exactly? With villages no greater than a few dozen families, harvesting and transporting these stones must have been an all-inclusive village affair. Two rivers merge within a stone’s throw from the ancient statues. Could this have been a place of pilgrimage where people came in canoes from perhaps as far as the Caribbean coast to mutually celebrate important periods in the year? If only the eyes on the statues could tell Geurds what they have seen.

For Alexander Geurds the bouncy road into the lowlands does not stop at this monumental site, it still goes on, just a bit more narrow. Local inhabitants speak of more statues (and bigger snakes!) further east.

Wednesday, July 30, 2014

16-foot Waves Measured in Arctic Ocean Where There Was Once Only Ice

Reduced sea ice allowed the buildup of huge waves in the Beaufort Sea.


Sixteen-foot waves are buffeting an area of the Arctic Ocean that until recently was permanently covered in sea ice—another sign of a warming climate, scientists say.

Because wave action breaks up sea ice, allowing more sunlight to warm the ocean, it can trigger a cycle that leads to even less ice, more wind, and higher waves. (See "Shrinking Arctic Ice Prompts Drastic Change in National Geographic Atlas.")

Scientists had never measured waves in the Beaufort Sea, an area north of Alaska, until recently. Permanent sea ice cover prevented their formation. But much of the region is now ice-free by September, and researchers were able to anchor a sensor to measure wave heights in the central Beaufort Sea in 2012.

"It is possible that the increased wave activity will be the feedback mechanism which drives the Arctic system toward an ice-free summer," write Jim Thomson of the University of Washington in Seattle and Erick Rogers with the Naval Research Laboratory (NRL) in Mississippi in the journal Geophysical Research Letters.

If winds can blow for a longer distance over the open ocean, they can produce higher and higher waves. Sea ice limits how far winds can blow, thus limiting the formation of waves.

"Future scenarios for reduced seasonal sea ice cover in the Arctic suggest that larger waves are to be expected," the study authors write. (See "As Sea Ice Shrinks, Can Polar Bears Survive on Land?")

Big waves could be the new normal in the Arctic, says Darek Bogucki, a physical oceanographer who works in the Arctic but wasn't involved in the study.

That means changes for shorelines, which could start getting hit with larger and larger waves that speed erosion, he says. It could also change the amount of carbon dioxide being exchanged between the atmosphere and the ocean, potentially triggering the Arctic to release more greenhouse gas into the atmosphere.

The amount of open water varies annually in the Beaufort, with virtually no open water in April when sea ice is at its maximum, to over 621 miles (1,000 kilometers) during sea ice minimums in September. Although the Arctic has been steadily losing its sea ice cover since the late 1970s, that loss accelerated in 2002. The 16-foot (five-meter) waves the scientists' instrument picked up occurred during a storm with strong winds on September 18, 2012.
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