Trans-Atlantic Glider Passes Spot Where Predecessor Sank
On July 31, 2009, the submersible robot glider RU27, also known as the Scarlet Knight, passed east of the spot in the Atlantic Ocean where its predecessor, RU17, was lost on Oct. 28, 2008. Scott Glenn, professor of marine science and director of the Coastal Ocean Observation Laboratory in Rutgers' Institute of Marine and Coastal Sciences, wrote in the mission blog: "Way back in April, we also started RU27 closer to shore than RU17. RU17, because of its indirect route, still has longer total distance flown. But with its more consistent speed and steering, and with the improved environmental guidance, has done much better in distance made good along a west-to-east line." 
The cast of characters is the same, but much else has changed since Glenn, his colleagues and students attempted to launch a submersible robot glider across the Atlantic last year. The gliders - Slocum electric gliders, made by Teledyne-Webb Research of Falmouth, Mass. - carry sensors measuring the water's salinity, density, and temperature. The COOL crew controls them from the lab as they move very slowly from one "way point" to the next.
On May 21, 2008, Glenn, Oscar Schofield, Josh Kohut and their undergraduates in the ocean-observing class launched the first Scarlet Knight, RU17, into the water off Atlantic City. For five months and 5,700 kilometers, they rode the Gulf Stream, navigated eddies and meanders, solved numerous technical problems, and then lost the glider northwest of the Azores.
The new Scarlet Knight, RU27, was deployed off Atlantic City on April 27, 2009, and is now more than halfway to Vigo, in northwestern Spain. Like the RU17, the RU27 is modified especially for crossing the ocean - lithium batteries instead of alkaline for longer life, a longer body to accommodate a larger battery pack. But this year, the hull is coated with special paint intended to discourage aquatic critters, ranging from barnacles to remoras to squid, from hanging on to the hull. They’ve even practiced a new maneuver - flying backward - to help them shake off really persistent hitch-hikers. The COOL crew knows exactly how much battery life they have in the new glider - 300 days. There is an automatic on/off feature for the glider’s sensors, so that the glider is not dependent on a human being in the lab physically typing in the command.
The cast of characters is the same, but much else has changed since Glenn, his colleagues and students attempted to launch a submersible robot glider across the Atlantic last year. The gliders - Slocum electric gliders, made by Teledyne-Webb Research of Falmouth, Mass. - carry sensors measuring the water's salinity, density, and temperature. The COOL crew controls them from the lab as they move very slowly from one "way point" to the next.
On May 21, 2008, Glenn, Oscar Schofield, Josh Kohut and their undergraduates in the ocean-observing class launched the first Scarlet Knight, RU17, into the water off Atlantic City. For five months and 5,700 kilometers, they rode the Gulf Stream, navigated eddies and meanders, solved numerous technical problems, and then lost the glider northwest of the Azores.
The new Scarlet Knight, RU27, was deployed off Atlantic City on April 27, 2009, and is now more than halfway to Vigo, in northwestern Spain. Like the RU17, the RU27 is modified especially for crossing the ocean - lithium batteries instead of alkaline for longer life, a longer body to accommodate a larger battery pack. But this year, the hull is coated with special paint intended to discourage aquatic critters, ranging from barnacles to remoras to squid, from hanging on to the hull. They’ve even practiced a new maneuver - flying backward - to help them shake off really persistent hitch-hikers. The COOL crew knows exactly how much battery life they have in the new glider - 300 days. There is an automatic on/off feature for the glider’s sensors, so that the glider is not dependent on a human being in the lab physically typing in the command.
All these changes have been a help this time around, Kerfoot said. The satellite data supplied by the University of the Azores has also been valuable. But the two most important advantages may be changes in the movment of the Gulf Stream and lessons learned from last year's experience that help the COOL crew take advantage of those changes. The Gulf Stream comes up the east coast of North America, and then starts trending east at about Cape Hatteras, Kerfoot said. But it meanders, and last year, it meandered north and south a good deal. This year, the flow pattern has been east and northeast.
"We've also learned a lot," Kerfoot said. "As long as we're watching very carefully where we are in the Gulf Stream, we have a very good feel for where we want to put the glider in relations to those high-velocity currents. It's a combination of being better at reading the data, and the shape of the Gulf Stream."
In 2008, the RU17 was beset with various critters -- "biota" in marine science lingo. Though the scientists couldn't be sure which animals were hitching a ride, they knew that some were, because the glider had trouble ascending to its pre-programed, submarine apogee. So far in 2009, the new hull paint seems to have discouraged the squid, remoras and barnacles that were a drag on the RU17's progress.
The Scarlet Knight is one of 23 gliders in the Rutgers fleet. They are ocean-observing systems, carrying various sensors in their science bays. Those sensors measure physical properties like water temperature and salinity. While the Scarlet Knight is traveling alone, her 22 sisters usually are deployed simultaneously with other ocean-observing systems, such as high-frequency radar and satellite data, to form a holistic picture of a given piece of the ocean. Satellite data might show sea-surface temperature, for instance, and radars would show the direction and speed of surface currents. All these pieces of the puzzle are necessary, Glenn said, to understand a constantly changing ocean environment.
“The nice thing about the gliders is that they can go to extreme environments that scientists can’t go to,” Glenn said. “They can stay at sea for longer than scientists can. And they can be in more than one place at once."
The gliders move by by changing buoyancy. A small electric motor operates a pump, which sucks in water through tiny holes in the nose. The nose dips, the glider sinks, and its delta wings turn the downward motion into forward motion. At its preprogrammed depth, the pump spits out the water. The nose rises, the glider ascends, and the wings turn the upward motion into forward motion.
In 2008, the RU17 was beset with various critters -- "biota" in marine science lingo. Though the scientists couldn't be sure which animals were hitching a ride, they knew that some were, because the glider had trouble ascending to its pre-programed, submarine apogee. So far in 2009, the new hull paint seems to have discouraged the squid, remoras and barnacles that were a drag on the RU17's progress.
The Scarlet Knight is one of 23 gliders in the Rutgers fleet. They are ocean-observing systems, carrying various sensors in their science bays. Those sensors measure physical properties like water temperature and salinity. While the Scarlet Knight is traveling alone, her 22 sisters usually are deployed simultaneously with other ocean-observing systems, such as high-frequency radar and satellite data, to form a holistic picture of a given piece of the ocean. Satellite data might show sea-surface temperature, for instance, and radars would show the direction and speed of surface currents. All these pieces of the puzzle are necessary, Glenn said, to understand a constantly changing ocean environment.
“The nice thing about the gliders is that they can go to extreme environments that scientists can’t go to,” Glenn said. “They can stay at sea for longer than scientists can. And they can be in more than one place at once."
The gliders move by by changing buoyancy. A small electric motor operates a pump, which sucks in water through tiny holes in the nose. The nose dips, the glider sinks, and its delta wings turn the downward motion into forward motion. At its preprogrammed depth, the pump spits out the water. The nose rises, the glider ascends, and the wings turn the upward motion into forward motion.
The glider “roller-coasters” through the water at speeds measured in centimeters per second. Every few hours, the glider pops out of the water and calls the lab with a satellite phone in its tail. It sends email, telling the lab its position and uploading data it has gathered, and then waits for instructions. The motor controlling the pump, the satellite phone in the tail that allows the lab to communicate with the glider, the movement of the rudder, even the angle of glide - all those functions rely on the batteries. Glenn is fond of holding up a plastic bag containing six Christmas tree lights to illustrate how efficient he and his students and colleagues have made the Scarlet Knight. "This is how much power the glider draws - enough to light six Christmas tree lights," he says.
Some time in August 2009, faculty and some undergraduates will go to the Azores to look at the Scarlet Knight on the surface. "We want to see it, to take pictures of it, to find out what, if anything, is growing on it," Kerfoot said.
One other new aspect to this year's attempt is that Dena Seidel, a documentary film maker and instructor in the English department's Writers' House, is working with her students to make a documentary about the project. They've been shooting in class, in the lab, on various practice deployments, and they were there on April 27 - aboard the R/V Arabella with the glider and on a commercial launch, as well.
Glider deployments depend upon the weather, and this one was delayed because of storms. But on Monday, April 27, conditions were very close to perfect as Glenn and marine technicians Dave Aragon and Tina Haskin loaded the glider aboard the R/V Arabella at the Rutgers University Marine Field Station in Little Egg Harbor Township, N.J.
They were joined by Seidel and one of her students, Alex Prister. Two more of Seidel's student documentarians, Amanda Bullis and Steve Beeston, were aboard a commercial launch. George H. Cook Campus Dean Richard Ludescher, professor of food science and executive producer of Seidel's documentary, was also aboard.
When the glider and its wheeled carriage were lashed to the deck, and the Arabella began her slow chug toward the Little Egg Inlet and the open sea, Glenn, perhaps for the first time in a long time, had absolutely nothing to do. "That's it," he said as he stood on deck watching the dock slide by. "Everything that can be done, has been done."
About three hours later, the glider slipped into the water and under the waves -- and began to fly backwards. Ludescher, who used a satellite phone to provide the play-by-play for Schofield, Kohut, their students, various staff, journalists and more of Seidel's crew back in the COOL room, stopped his commentary. "Is Scott's head exploding yet?" Schofield asked Ludescher.
As it turned out, a typo in an instruction to the glider told it to fly backwards. The instruction was revised, and the glider flew as it should. There was applause in the COOL room, and on the Arabella, Ludescher called out, "Group hug! Let's have a group hug!" About 90 minutes later, control was passed from the technicians on the boat to the COOL room. Late on Friday, May 1, the Scarlet Knight passed over the edge of the continental shelf, having dodged fishing nets and large ships, and her pilots faced the new challenge of finding their way into the Gulf Stream.
Some time in August 2009, faculty and some undergraduates will go to the Azores to look at the Scarlet Knight on the surface. "We want to see it, to take pictures of it, to find out what, if anything, is growing on it," Kerfoot said.
One other new aspect to this year's attempt is that Dena Seidel, a documentary film maker and instructor in the English department's Writers' House, is working with her students to make a documentary about the project. They've been shooting in class, in the lab, on various practice deployments, and they were there on April 27 - aboard the R/V Arabella with the glider and on a commercial launch, as well.
Glider deployments depend upon the weather, and this one was delayed because of storms. But on Monday, April 27, conditions were very close to perfect as Glenn and marine technicians Dave Aragon and Tina Haskin loaded the glider aboard the R/V Arabella at the Rutgers University Marine Field Station in Little Egg Harbor Township, N.J.
They were joined by Seidel and one of her students, Alex Prister. Two more of Seidel's student documentarians, Amanda Bullis and Steve Beeston, were aboard a commercial launch. George H. Cook Campus Dean Richard Ludescher, professor of food science and executive producer of Seidel's documentary, was also aboard.
When the glider and its wheeled carriage were lashed to the deck, and the Arabella began her slow chug toward the Little Egg Inlet and the open sea, Glenn, perhaps for the first time in a long time, had absolutely nothing to do. "That's it," he said as he stood on deck watching the dock slide by. "Everything that can be done, has been done."
About three hours later, the glider slipped into the water and under the waves -- and began to fly backwards. Ludescher, who used a satellite phone to provide the play-by-play for Schofield, Kohut, their students, various staff, journalists and more of Seidel's crew back in the COOL room, stopped his commentary. "Is Scott's head exploding yet?" Schofield asked Ludescher.
As it turned out, a typo in an instruction to the glider told it to fly backwards. The instruction was revised, and the glider flew as it should. There was applause in the COOL room, and on the Arabella, Ludescher called out, "Group hug! Let's have a group hug!" About 90 minutes later, control was passed from the technicians on the boat to the COOL room. Late on Friday, May 1, the Scarlet Knight passed over the edge of the continental shelf, having dodged fishing nets and large ships, and her pilots faced the new challenge of finding their way into the Gulf Stream.
Etiquetas: investigação, oceanografia, submarino
posted by Desertos e Desertificação at 7:03 a.m.
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André Barreiros estima que a quantidade de resíduos recolhida tenha ultrapassado uma tonelada.Apesar de não ter havido grande adesão por parte dos adultos, o jornalista freelancer acredita que os objectivos foram cumpridos. “Foi retirada do local uma quantidade significativa de plástico e outros resíduos e tivemos muitas crianças, especialmente da freguesia, que foram fantásticas. O nosso objectivo é essencialmente a sensibilização e a formação quanto a este4 problema e, nesse sentido, o mais importante é termos connosco as crianças”.A maioria são crianças com idades dos nove aos 13, 14 anos. Como Diogo Sousa, que garante que nunca mais vai atirar uma garrafa para o mar. De boné ao lado, vai dizendo que “o senhor que organiza isto faz bem, porque o plástico pode matar os peixes”.Isabel Pinto e Sofia Silva, duas raparigas de São Mateus, de olhar vivo e resposta pronta, filhas de pescadores e de mulheres ligadas aos ofícios do mar, confessam que não sabiam que o plástico era tão nocivo para os animais marinhos. “Vamos reciclar o que apanhámos e, assim os peixes já não têm de comer comida misturada com plástico”, responde Sofia à pergunta da jornalista. João Bernardo Barreiros fez parte da equipe que trabalhou na limpeza subaquática. Com o pai, mergulhou em apneia. Não foi nada de novo, mergulhar é algo que faz desde os oito anos. Mas foi por uma boa causa. “Já tinha alguma noção do mal que o plástico podia fazer aos animais marinhos, mas agora sei mesmo o impacte que este materiais podem ter”, explica. Depois, vai enumerando o que encontrou debaixo das ondas: Pneus, muitos cabos e até uma aparelhagem.
São oradores convidados os professores da Universidade dos Açores, Manuela Juliano e António Félix Rodrigues. De acordo com André Barreiros, em declarações a DI, a morte de animais devido à existência de plástico no mar já está sinalizada pela comunidade científica, mas não se conhecem ainda as verdadeiras dimensões do problema. “Um dos eixos deste projecto é acompanhar, divulgar e apoiar a investigação científica, nomeadamente no que diz respeito ao problema do micro-plástico, micro-partículas de plástico que se vão decompondo e que poluem, apesar de não serem visíveis, os oceanos. A intervenção pela professora Manuela Juliano deverá lançar algumas luzes sobre o tema”.
Ainda no território “Da Resistência” estas simpáticas jovens tiveram a oportunidade de conhecerem os sedutores “Donatário” e “Chico Maria”.
Os dados resultam da aplicação nos Açores de um modelo hidrodinâmico, desenvolvido pelo Instituto Superior Técnico (Portugal) que efectua a previsão de diversos parâmetros oceanográficos como aqueles que são agora disponibilizados. A consulta dos dados é feita através do sítio da Internet www.climaat.angra.uac.pt consultando a ligação à previsão oceanográfica que tem actualizações diárias e inclui também a previsão atmosférica. O projecto, desenvolvido desde 2007, foi liderado pelo professor e investigador Ramiro Neves, do “Maretec” do Instituto Superior Técnico, e custou cerca de um milhão de euros, dos quais 100 mil euros aplicados nos Açores. Os estudos foram apoiados pelo programa Europeu Interreg-III B - Espaço Atlântico da Macaronésia, envolveu Centro de Clima, Meteorologia e Mudanças Globais da Universidade dos Açores, o Instituto Superior Técnico, ambos de Portugal, e organismos de investigação de Toulouse (França) e Galiza (Espanha). Denominado Easy Europeean Atlantic Forcasting System, os trabalhos foram coordenados cientificamente para os Açores por Manuela Juliano, investigadora que descobriu a corrente de Santa Helena no Atlântico Sul, uma congénere da corrente dos Açores no Atlântico Norte. Manuela Juliano revelou ainda que o projecto vai iniciar, a partir do próximo dia 25 em Toulouse, França, uma segunda fase de estudos, denominada “Easy CO” que, utilizando os dados da primeira fase, vai projectar novos produtos. Vão abranger áreas da modelação operacional oceânica com previsões de parâmetros biogeoquímicos destinados a apoiar as pescas e a determinar a qualidade da água em todo o Atlântico Norte Europeu. Neste projecto, segundo Manuela Juliano, estarão envolvidos o Centro de Clima, Meteorologia e Mudanças Globais e o Departamento de Oceanografia e Pescas, ambos da Universidade dos Açores, o Instituto Superior Técnico e instituições de investigação de Espanha, França, Inglaterra e Irlanda.
Cinco objectivos estão definidos à partida: desenvolver um centro de excelência académica e incentivar a consciência das políticas da União Europeia, relacionadas com as mudanças climáticas e o seu potencial impacto; promover conferências, workshops e outro tipo de actividades de carácter informativo; promover também contactos individuais entre universidades e comunidades da Europa e dos Estados Unidos; e consolidar uma rede de contactos entre centros de excelência; bem como procurar fontes de financiamento para concretizar os objectivos delineados. Segundo a documentação disponibilizada pelo Consulado, a Fundação Luso-Americana para o Desenvolvimento (FLAD), o Millennium bcp, o Banco Espírito Santo dos Açores e o próprio Governo Regional dos Açores já manifestaram disponibilidade para estar entre as entidades financiadoras.O segundo projecto é uma iniciativa do Departamento de Energia do Governo dos Estados Unidos mas que envolve o Governo Regional dos Açores e a própria Universidade dos Açores. Como explicou Jean Manes, depois de ter sido assinado um protocolo em Maio, quando o secretário da Energia do governo norte-americano esteve em Lisboa, está agora agendada para 30 de Julho uma reunião com todas as entidades envolvidas para preparar a implementação do projecto. Mas porquê os Açores? A cônsul dos Estados Unidos da América nos Açores explica que a situação geográfica do arquipélago - entre os EUA e a Europa - é uma das razões que alicerça o interesse do seu governo na Região, mas neste caso a principal razão está relacionada com o facto dos cientistas reconhecerem os Açores como uma zona privilegiada para estudar vários aspectos relacionados com a ciência marinha e as mudanças de clima.
It is argued that both current systems and associated fronts are the poleward 18°C Mode Water discontinuities of the two Atlantic subtropical gyres and that both originate at the corresponding hemisphere western boundary current systems from which they penetrate into the open ocean interior. Thus, both currents should have a similar forcing source, and their origin should not be linked to any geographical peculiarities. 
