Monday, June 3, 2019

Last American slave ship is discovered in Alabama

In this short film, the descendants of Africans on the last known American slave ship, Clotilda, describe what it would mean to discover and document the wreck site of the vessel.

From National Geographic by Joel K. Bourne Jr

The schooner Clotilda smuggled African captives into the U.S.
in 1860, more than 50 years after importing slaves was outlawed.

The schooner Clotilda—the last known ship to bring enslaved Africans to America’s shores—has been discovered in a remote arm of Alabama’s Mobile River following an intensive yearlong search by marine archaeologists.

"Descendants of the Clotilda survivors have dreamed of this discovery for generations," says Lisa Demetropoulos Jones, executive director of the Alabama Historical Commission (AHC) and the State Historic Preservation Officer.
"We’re thrilled to announce that their dream has finally come true."

One hundred and nine African captives survived the brutal, six-week passage from West Africa to Alabama in Clotilda’s cramped hold.
Originally built to transport cargo, not people, the schooner was unique in design and dimensions—a fact that helped archaeologists identify the wreck.
Jason Treat and Kelsey Nowakowski, NG staff.
art: Thom Tenery

The captives who arrived aboard Clotilda were the last of an estimated 389,000 Africans delivered into bondage in mainland America from the early 1600s to 1860.
Thousands of vessels were involved in the transatlantic trade, but very few slave wrecks have ever been found.
(See how archaeologists pieced together clues to identify the long-lost slave ship.)

"The discovery of the Clotilda sheds new light on a lost chapter of American history," says Fredrik Hiebert, archaeologist-in-residence at the National Geographic Society, which supported the search.
"This finding is also a critical piece of the story of Africatown, which was built by the resilient descendants of America’s last slave ship."

Rare firsthand accounts left by the slaveholders as well as their victims offer a one-of-a-kind window into the Atlantic slave trade, says Sylviane Diouf, a noted historian of the African diaspora.

"It’s the best documented story of a slave voyage in the Western Hemisphere," says Diouf, whose 2007 book, Dreams of Africa in Alabama, chronicles the Clotilda’s saga.
"The captives were sketched, interviewed, even filmed," she says, referring to some who lived into the 20th century.
"The person who organized the trip talked about it. The captain of the ship wrote about it. So we have the story from several perspectives. I haven’t seen anything of that sort anywhere else."

In 1927 Cudjo Lewis, then one of the last living Clotilda survivors, shared his life story with anthropologist Zora Neale Hurston.
Her book Barracoon, finally published in 2018, includes Lewis's telling of the harrowing voyage aboard Clotilda.


It began with a bet

Clotilda’s story began when Timothy Meaher, a wealthy Mobile landowner and shipbuilder, allegedly wagered several Northern businessmen a thousand dollars that he could smuggle a cargo of Africans into Mobile Bay under the nose of federal officials.

Importing slaves into the United States had been illegal since 1808, and southern plantation owners had seen prices in the domestic slave trade skyrocket.
Many, including Meaher, were advocating for reopening the trade.

Clotilda’s Journey

In 1860, Clotilda smuggled West African captives into the U.S.
Routes and dates are taken from the account of the ship’s captain, William Foster.

 Matthew Chwastyk and Jason Treat, NG staff.
source: Mobile Public Library

Meaher chartered a sleek, swift schooner named Clotilda and enlisted its builder, Captain William Foster, to sail it to the notorious slave port of Ouidah in present-day Benin to buy captives.
Foster left West Africa with 110 young men, women, and children crowded into the schooner’s hold.
One girl reportedly died during the brutal six-week voyage.
Purchased for $9,000 in gold, the human cargo was worth more than 20 times that amount in 1860 Alabama.

After transferring the captives to a riverboat owned by Meaher’s brother, Foster burned the slaver to the waterline to hide their crime.
Clotilda kept her secrets over the decades, even as some deniers contended that the shameful episode never occurred.

After the Civil War ended and slavery was abolished, the Africans longed to return to their home in West Africa.
Lacking the means, they managed to buy small plots of land north of Mobile, where they formed their own tight-knit community that came to be known as Africatown.
There they made new lives for themselves but never lost their African identity.
Many of their descendants still live there today and grew up with stories of the famous ship that brought their ancestors to Alabama.
"If they find evidence of that ship, it's going to be big," descendant Lorna Woods predicted earlier this year.
"All Mama told us would be validated. It would do us a world of good."

Mary Elliott, a curator at the Smithsonian National Museum of African American History and Culture, agrees.
"There are many examples today—the Tulsa race riots of 1921, this story, even the Holocaust—where some people say it never happened.
Now, because of the archaeology, the archival research, the science combined with the collective memories of the community, it can't be refuted.
They are now connected to their ancestors in a tangible way, knowing this story is true." (Their ancestors survived slavery. Can their descendants save the town they built?)

Shipwreck found in Mobile River identified as the Clotilda

The hunt for lost history

Several attempts to locate Clotilda’s remains have been made over the years, but the Mobile-Tensaw Delta is rife with sloughs, oxbows, and bayous, as well as scores of shipwrecks from more than three centuries of maritime activity.
Then in January 2018 Ben Raines, a local journalist, reported that he had discovered the remains of a large wooden ship during an abnormally low tide.
The AHC, which owns all abandoned ships in Alabama’s state waters, called in the archaeology firm Search, Inc., to investigate the hulk.

The vessel in question turned out to be another ship, but the false alarm focused national attention on the long-lost slaver.
The incident also prompted the AHC to fund further research in partnership with the National Geographic Society and Search, Inc.

Researchers combed through hundreds of original sources from the period and analyzed records of more than 2,000 ships that were operating in the Gulf of Mexico during the late 1850s.
They discovered that Clotilda was one of only five Gulf-built schooners then insured.
Registration documents provided detailed descriptions of the schooner, including its construction and dimensions.

Maritime archaeologist James Delgado scans a section of the Mobile River during the search for Clotilda’s final resting place.
Photograph by Asha Stuart, National Geographic

"Clotilda was an atypical, custom-built vessel," says maritime archaeologist James Delgado of Search, Inc.
"There was only one Gulf-built schooner 86 feet long with a 23-foot beam and a six-foot, 11-inch hold, and that was Clotilda."


Records also noted that the schooner was built of southern yellow pine planking over white oak frames and was outfitted with a 13-foot-long centerboard that could be raised or lowered as needed to access shallow harbors.

Based on their research of possible locations, Delgado and Alabama state archaeologist Stacye Hathorn focused on a stretch of the Mobile River that had never been dredged.
Deploying divers and an array of devices—a magnetometer for detecting metal objects, a side-scan sonar for locating structures on and above the river bottom, and a sub-bottom profiler for detecting objects buried beneath the mucky riverbed—they discovered a veritable graveyard of sunken ships.

Prior to the state survey, Raines continued his own search for the wreck, enlisting researchers from the University of Southern Mississippi (USM) to map the contours of the riverbed and detect any submerged objects.
The USM survey revealed the presence of a wooden wreck bearing some hallmarks of a 19th-century vessel.
"The dimensions of the ship have not been determined yet,” Raines reported in June 2018.
“It also remains unclear what type of vessel was found.
Answering those questions will take a more thorough and invasive examination, precisely the expertise of Search, Inc."

Ben Raines, a reporter for the Birmingham News, described on Jan. 24 his discovery of a shipwreck believed to be the last vessel to bring enslaved Africans to the U.S. nearly 160 years ago.

Delgado’s team easily eliminated most of the potential wrecks: wrong size, metal hull, wrong type of wood.
But the vessel Raines and the USM survey had highlighted stood out from the rest.
Over the next ten months, Delgado’s team analyzed the sunken vessel’s design and dimensions, the type of wood and metal used in its construction, and evidence that it had burned.
It "matched everything on record about Clotilda," Delgado said.

Samples of wood recovered from Target 5 are white oak and southern yellow pine from the Gulf coast.
The archaeologists also found the remains of a centerboard of the correct size.

Metal fasteners from its hull are made of hand-forged pig iron, the same type known to have been used on Clotilda.
And there’s evidence that the hull was originally sheathed with copper, as was then common practice for oceangoing merchant vessels.

No nameplate or other inscribed artifacts conclusively identified the wreck, Delgado says, "but looking at the various pieces of evidence, you can reach a point beyond reasonable doubt."

 From directly overhead, you can see the outline of a giant sailing ship. It appears to be the Clotilda, the last slave ship.
The photographers boat looks like a toy next to it, but is actually 22 feet long.
The wreck measured about 124 feet.
Ben Raines / via AL.com

A national slave ship memorial?

The wreck of Clotilda now carries the dreams of Africatown, which has suffered from declining population, poverty, and a host of environmental insults from heavy industries that surround the community.
Residents hope that the wreck will generate tourism and bring businesses and employment back to their streets.
Some have even suggested it be raised and put on display.

The community was recently awarded nearly $3.6 million from the BP Deepwater Horizon legal settlement to rebuild a visitor center destroyed in 2005 by Hurricane Katrina.
But what’s left of the burned-out wreck is in very poor condition, says Delgado.
Restoring it would cost many millions of dollars.

But a national slave ship memorial—akin to the watery grave of the U.S.S.
Arizona in Pearl Harbor—might be an option.
There visitors could reflect on the horrors of the slave trade and be reminded of Africa’s enormous contribution to the making of America.
Read about 13 museums and monuments that connect to important moments in African-American history.)

"We are still living in the wake of slavery," says Paul Gardullo, director of the Center for the Study of Global Slavery at the National Museum of African American History and Culture and a member of the Slave Wrecks Project that was involved in the search for Clotilda.
“We continue to be confronted by slavery.
It keeps popping up because we haven’t dealt with this past.
If we do our work right, we have an opportunity not just to reconcile, but to make some real change.”

Links :

Sunday, June 2, 2019

Teams autonomously mapping the depths take home millions in Ocean Discovery Xprize

On May 31, 2019, XPRIZE announced winners in the $7M Shell Ocean Discovery XPRIZE, a global competition to advance ocean technologies for rapid, unmanned and high-resolution ocean exploration and discovery.
Meet our finalist teams from all over the world
From Techcrunch by Devin Coldewey

There’s a whole lot of ocean on this planet, and we don’t have much of an idea what’s at the bottom of most of it.
That could change with the craft and techniques created during the Ocean Discovery Xprize, which had teams competing to map the sea floor quickly, precisely and autonomously.
The winner just took home $4 million.

A map of the ocean would be valuable in and of itself, of course, but any technology used to do so could be applied in many other ways, and who knows what potential biological or medical discoveries hide in some nook or cranny a few thousand fathoms below the surface?


The prize, sponsored by Shell, started back in 2015.
The goal was, ultimately, to create a system that could map hundreds of square kilometers of the sea floor at a five-meter resolution in less than a day — oh, and everything has to fit in a shipping container.
For reference, existing methods do nothing like this, and are tremendously costly.

But as is usually the case with this type of competition, the difficulty did not discourage the competitors — it only spurred them on.
Since 2015, then, the teams have been working on their systems and traveling all over the world to test them.

Originally the teams were to test in Puerto Rico, but after the devastating hurricane season of 2017, the whole operation was moved to the Greek coast.
Ultimately after the finalists were selected, they deployed their craft in the waters off Kalamata and told them to get mapping.

“It was a very arduous and audacious challenge,” said Jyotika Virmani, who led the program.
“The test itself was 24 hours, so they had to stay up, then immediately following that was 48 hours of data processing after which they had to give us the data.
It takes more trad companies about 2 weeks or so to process data for a map once they have the raw data — we’re pushing for real time.”

This wasn’t a test in a lab bath or pool.
This was the ocean, and the ocean is a dangerous place.
But amazingly there were no disasters.

“Nothing was damaged, nothing imploded,” she said.
“We ran into weather issues, of course. And we did lose one piece of technology that was subsequently found by a Greek fisherman a few days later… but that’s another story.”

At the start of the competition, Virmani said, there was feedback from the entrants that the autonomous piece of the task was simply not going to be possible.
But the last few years have proven it to be so, given that the winning team not only met but exceeded the requirements of the task.

“The winning team mapped more than 250 square kilometers in 24 hours, at the minimum of five meters resolution, but around 140 was more than five meters,” Virmani told me.
“It was all unmanned: An unmanned surface vehicle that took the submersible out, then recovered it at sea, unmanned again, and brought it back to port.
They had such great control over it — they were able to change its path and its programming throughout that 24 hours as they needed to.”
(It should be noted that unmanned does not necessarily mean totally hands-off — the teams were permitted a certain amount of agency in adjusting or fixing the craft’s software or route.)

A five-meter resolution, if you can’t quite picture it, would produce a map of a city that showed buildings and streets clearly, but is too coarse to catch, say, cars or street signs.
When you’re trying to map two-thirds of the globe, though, this resolution is more than enough — and infinitely better than the nothing we currently have.
(Unsurprisingly, it’s also certainly enough for an oil company like Shell to prospect new deep-sea resources.)

The winning team was GEBCO, composed of veteran hydrographers — ocean mapping experts, you know.
In addition to the highly successful unmanned craft (Sea-Kit, already cruising the English Channel for other purposes), the team did a lot of work on the data-processing side, creating a cloud-based solution that helped them turn the maps around quickly.
(That may also prove to be a marketable service in the future.)
They were awarded $4 million, in addition to their cash for being selected as a finalist.


The runner up was Kuroshio, which had great resolution but was unable to map the full 250 km2 due to weather problems.
They snagged a million.

A bonus prize for having the submersible track a chemical signal to its source didn’t exactly have a winner, but the teams’ entries were so impressive that the judges decided to split the million between the Tampa Deep Sea Xplorers and Ocean Quest, which amazingly enough is made up mostly of middle-schoolers.
The latter gets $800,000, which should help pay for a few new tools in the shop there.

Lastly, a $200,000 innovation prize was given to Team Tao out of the U.K., which had a very different style to its submersible that impressed the judges.
While most of the competitors opted for a craft that went “lawnmower-style” above the sea floor at a given depth, Tao’s craft dropped down like a plumb bob, pinging the depths as it went down and back up before moving to a new spot.
This provides a lot of other opportunities for important oceanographic testing, Virmani noted.

Having concluded the prize, the organization has just a couple more tricks up its sleeve.
GEBCO, which stands for General Bathymetric Chart of the Oceans, is partnering with The Nippon Foundation on Seabed 2030, an effort to map the entire sea floor over the next decade and provide that data to the world for free.

And the program is also — why not? — releasing an anthology of short sci-fi stories inspired by the idea of mapping the ocean.
“A lot of our current technology is from the science fiction of the past,” said Virmani.
“So we told the authors, imagine we now have a high-resolution map of the sea floor, what are the next steps in ocean tech and where do we go?”
The resulting 19 stories, written from all 7 continents (yes, one from Antarctica), will be available June 7.

Links :

Saturday, June 1, 2019

Image of the week : Malaspina glacier

Piedmont glaciers occur when steep valley glaciers spill into flat plains, where they spread out into bulb-like lobes.
The massive lobe of Malaspina Glacier in Alaska is clearly visible in this Sentinel2 image.
The glacier covers more than 3,900 km2

 Malespina Glacier with the GeoGarage platform (NOAA nautical chart)

Friday, May 31, 2019

Fishing fleets have doubled since 1950—but they’re having a harder time catching fish


Surprising new study finds that the number of fishing vessels more than doubled to 3.7 million between 1950 and 2015.
These findings reinforce the urgent need for increased transparency of fishing activity to improved management.
The United Nations says 90% of the world's fisheries have collapsed, and the Chinese are the biggest culprits.
By a long way, China has the world's largest deep sea fishing fleet including 2,600 mega trawlers stripping the ocean floor.
They're helping satisfy China's insatiable appetite for seafood.
The Chinese eat more than a third of the world's fish supplies.
Despite tough new laws to help ensure stock, there are serious concerns about how long it can be sustained.
From ScienceMag by Erik Stokstad

The number of boats harvesting seafood has increased significantly since the middle of the previous century, a new global analysis finds, and is much higher than some scientists assumed.
Meanwhile, ships’ motors are getting larger, expanding their range and ability to bring more fish to port.
But as competition increases, fish stocks are being taxed and it is taking more effort to find fish, the researchers warn.
The trend is likely to continue, they say, and highlights the need to improve fisheries management in many places.

“The new study is a big step forward” in understanding the nature of global fishing, says fisheries biologist Ray Hilborn of the University of Washington in Seattle who was not involved with the work.

Previous studies of global fishing fleets have typically relied on intergovernmental agencies, such as the Food and Agriculture Organization of the United Nations, which don’t have complete records.
For the new work, Yannick Rousseau—a graduate student in the lab of Reg Watson, a fisheries ecologist at the University of Tasmania in Hobart, Australia—gathered additional data from about 100 countries, examining local reports, national registries, and scientific papers.
Rousseau was able to analyze trends for three groups of vessels: both motorized and unmotorized small-scale fishing boats, often called artisanal, and industrial fishing boats, which are typically longer than 12 meters and can go farther offshore.

The number of ships more than doubled to 3.7 million between 1950 and 2015, the team reports this week in the Proceedings of the National Academy of Sciences; in Asia, the number quadrupled.
Another important trend is the spread of motors.
In the 1950s, only about 20% of fishing vessels around the world had motors; by 2015, 68% did, most with power under 50 kilowatts—a small engine, or outboard motor, for example.

Tabulating all these figures, Rousseau and his co-authors found that the combined engine power of small vessels equals that of the industrial fleet.
“It was a very counterintuitive result,” Rousseau says, given the public and political attention attracted by large fishing vessels.


Still, just because a fleet of small boats boasts as much engine power as large trawlers “doesn’t mean it will have the same impacts,” cautions Ratana Chuenpagdee, a policy expert at Memorial University of Newfoundland in St.
John’s, Canada, who studies small-scale fisheries.
The type of fishing gear influences ecological health, she notes, and politics can play a strong role, too.
When a community has control over the resource, a fleet of local boats may have more incentive to conserve the fish stocks than a large ship from overseas.

The huge engines used today in industrial fisheries allow boats to go much faster and farther, spend more time catching fish in distant waters, and store them in freezers.
“The killing power of these vessels goes up,” Watson says.
“It really ups the game.”

But compared with ships in the 1950s, today’s global fleet catches only 20% as much fish for the same amount of effort.
This metric—called catch per unit effort, sometimes measured by days at sea—is a key indicator of fish population size and responsible management, which limits the number of fishing vessels or stops them from overfishing.
These actions have stabilized fish stocks in the past 2 decades in North America, Western Europe, and Australia, where government regulators have tightened the rules and subsidies have made it more attractive to retire ships.
Not so in Southeast Asia, the Mediterranean, and Latin America.

The BBC investigates illegal and unsustainable fishing off the west coast of Africa to find out how one of the most fertile ecosystems on earth has been pushed to the brink.

The situation could get worse.
At current rates, the researchers expect a million more fishing vessels to become motorized by 2050, and engine power will increase on others.
Fleets of larger vessels will continue to move into territorial waters of other countries and also into the high seas.
These trends will make it harder to sustainably exploit fish stocks, Watson says.
“We haven’t reached the peak of intensive fishing.”

Many developing nations will need help to improve their fisheries management, Watson says, as well as better information on fish stocks.
The new data on vessels could help.
In places where biologists have not assessed the size of fish populations, they could use information about the fleets to estimate the pressure on local stocks.

Fisheries scientists and marine ecologists will also be interested in the new data to better understand the global picture, Hilborn says.
“It will be the basis of a lot of further work.”

Links :

Thursday, May 30, 2019

Epic view of Moon transiting the Earth

This shot is beautiful and should be taught in any film studies class.
This animation features actual satellite images of the far side of the moon, illuminated by the sun, as it crosses between the DSCOVR spacecraft's Earth Polychromatic Imaging Camera (EPIC) and telescope, and the Earth - one million miles away.
NASA