Ocean Currents
Posted: February 28, 2009 Filed under: oceans, water, Winds 3 Comments »The water at the ocean surface is moved primarily by winds that blow in certain patterns because of the Earth’s spin and the Coriolis Effect. Winds move the top 400 meters of the ocean creating surface ocean currents.
Surface ocean currents form large circular patterns called gyres. Gyres flow clockwise in Northern Hemisphere and anticlockwise in Southern Hemisphere because of the Coriolis Effect. creating surface ocean currents. Near the Earth’s poles, gyres tend to flow in the opposite direction.
Ocean Currents are of different types. Some currents are deep and narrow. Other currents are shallow and wide. Currents are often affected by the shape of the ocean floor. Some are fast while others are not so fast. A current can also change in depth and speed over time.
Surface ocean currents can be very large. The Gulf Stream, a surface current in the North Atlantic, carries 4500 times more water than the Mississippi River. Each second, ninety million cubic meters of water is carried past Chesapeake Bay (US) in the Gulf Stream.
Surface ocean currents carry redistribute heat in Earth system. This affects regional climates. The Sun warms water at the equator more than it does at the high latitude polar regions. The heat travels in surface currents to higher latitudes. A current that brings warmth into a high latitude region will make that region’s climate less chilly.
Surface ocean currents can create eddies, swirling loops of water, along the flow. Surface ocean currents can also affect upwelling in many places. They are important for sailors planning routes through the ocean. Currents are also important for marine life because they transport creatures around the world and affect the water temperature in ecosystems.
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Chennai’s Metrowater to use GIS for fault-rectification
Posted: February 27, 2009 Filed under: GIS, India 1 Comment »Officials of the Chennai Metropolitan Water Supply and Sewerage Board (CMWSSB) or Metrowater will soon use GIS to identify the location and details of pipelines and other utilities. This will speed up the process of fault-rectification.
Though the Planning Commission has just announced the project, the CMWSSB had carried out its pilot project three years ago. “It included 10 depots in and around Anna Nagar. We first obtained the satellite maps and then digitized them in GIS format. Details about all our utilities, including pipelines and its depth, the number of connections, the route of the pipes, etc. were fed in and could be accessed by merely placing the cursor on the desired location.” said a senior Metrowater official.
Source : http://timesofindia.indiatimes.com
Amphibians Disappearing from Yellowstone Park
Posted: February 26, 2009 Filed under: climate change, Global Warming Leave a comment »Frogs and salamanders are disappearing in Yellowstone National Park and researchers at Stanford blame their decline on global warming. Sarah McMenamin of Stanford University found in a study.
Alp-sized Peaks Found in Antarctic
Posted: February 24, 2009 Filed under: climate change, earth, Glaciers, Global Warming Leave a comment »Jagged mountains the size of the Alps have been found entombed in Antarctica’s ice, giving new clues about the vast ice sheet that will raise world sea levels if even a fraction of it melts. Using radar and gravity sensors, the experts made the first detailed maps of the Gamburtsev subglacial mountains, originally detected by Russian scientists 50 years ago at the heart of the East Antarctic ice sheet. “The surprising thing was that not only is this mountain range the size of the Alps, but it looks quite similar to the (European) Alps, with high peaks and valleys.
The U.N. panel on climate change says that greenhouse gases, mainly emitted by burning fossil fuels, will bring more heatwaves, floods and droughts, and raise sea levels.The team of experts from Australia, Britain, Canada, China, Germany, Japan and the United States also found water below the ice, using survey aircraft that flew 120,000 km (75,000 miles).Geologists say that mountain ranges such as the Alps or the Himalayas form in collisions between continents. The last time Antarctica was exposed to such forces was 500 million years ago.
IIT,Kanpur,India to Develop Nanosatellite-Jugnu
Posted: February 23, 2009 Filed under: Countries, India, News Leave a comment »
IIT-Kanpur with its nano satellite — `Jugnu’ is ready to set new highs in space research. A team of students, working under the guidance of faculty members of the institute and scientists of Indian Space Research Organisation (ISRO) are set to launch India’s first nano satellite.
Designed life span of the satellite is proposed to be one year. Jugnu`s design will have to overcome many challenges as it will have to face high vibrations even before its ejection. The satellite will also have to survive high doses of radiation that can cause damage to the system’s memory. There are many other functionality constraints on the satellite hardware due to the limited power availability.
The aim of the making and launching of `Jugnu’ is to develop a long term infrastructure and human resources in the IIT-K for future space research programmes in the institute in collaboration with ISRO.
Scientists have used indigenous technology to develop ‘Jugnu’, whose weight and length are 3kg and 34cm respectively, he said, adding an estimated amount of Rs 2.5 crore has been spent to develop the satellite.
The hi-tech cameras fitted in the satellite will send photographs regarding agriculture, weather and soil to the base station.The satellite can also be used to link other big satellites in the space.
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Earth’s Cooling Down, Not Up
Posted: February 22, 2009 Filed under: Global Warming, opinions 2 Comments »Found this on For What It’s Worth.
Don’t judge States on Wealth and Emissions: Singapore’s climate Envoy
Posted: February 22, 2009 Filed under: climate change, Countries, Ecosystem, Environment, opinions 1 Comment »Judging small, rich island nations purely on their wealth and emissions is unfair in climate change negotiations, Singapore’s climate envoy said on Saturday, as pressure builds on more countries to curb carbon pollution. Under the Kyoto Protocol, the U.N.’s main weapon to fight climate change, only 37 industrialized nations are committed to curbs on greenhouse gas pollution between 2008-2012. But the U.N. list in Kyoto’s parent pact that defines rich and developing nations dates from 1992 and wealthy nations such as Argentina, Singapore, South Korea and Malta are still deemed to be developing states under the U.N.’s climate treaties. Under Kyoto, developing nations are exempt from any binding emissions curbs but recent studies show poorer states now contribute more than half of mankind’s greenhouse gas emissions. ore’s chief climate change negotiator, Chew Tai Soo, said Singapore was responsible for 0.3 percent of global greenhouse emissions but faced pressure to curb its emissions because it was rich and had high per-capita carbon pollution. “This approach is flawed as it does not take into account the unique considerations and capabilities of different countries. “It penalizes small countries with small populations without taking into account their limitations,” he told a sustainability conference in Singapore. The city state is one of the world’s wealthiest nations with 2007 per-capita GDP of S$52,994 (US$35,163), according to government figures. Its greenhouse gas emissions are the same as many European countries at about 11 tonnes per person, compared with 20 tonnes for the United States and 4 for China. In a submission to the United Nations last November, Australia said the 1992 U.N. Framework Convention on Climate Change, Kyoto’s parent pact, let many advanced economies off the hook on carbon reduction obligations. “Since the Convention was adopted in 1992 no work has been done to better differentiate the responsibilities of Parties,” the submission said, adding the two annex lists of countries in the Kyoto Protocol were now out of date. Chew said Singapore covered an area a fifth the size of Long Island in New York, was densely populated, lacked natural resources and its agricultural sector was virtually non-existent. “With such economic restraints, we have no food security and are heavily dependent on trade and commerce for survival.” He also said the country was investing in research and development of solar and other clean-energy areas and that a decision to use natural gas in its power stations had slashed carbon emissions.
ISRO,India to launch RISAT, ANUSAT
Posted: February 19, 2009 Filed under: GIS, GPS, India, Remote Sensing 101 | Tags: Satellites Leave a comment »Bangalore, India: After the successful Chandrayaan-I moon mission, Indian Space Research Organisation is now getting ready for a twin launch – a “breakthrough” Radar Imaging Satellite (RISAT) and ANUSAT, a 35-kg micro-satellite designed by Chennai-based Anna University. Bangalore-headquartered ISRO is targeting a March last week date for launching them on board the indigenously built Polar Satellite Launch Vehicle from the Sriharikota spaceport.
Indian space scientists see the 1,780-kg RISAT as a major milestone for the country as far as remote sensing satellites are concerned. RISAT mission would have a C-band Synthetic Aperture Radar (SAR) payload, operating in a multi-polarisation and multi-resolution mode.
SAR, being an active sensor, operating in the microwave range of electromagnetic spectrum, provides the target parameters such as dielectric constant, roughness, and geometry, and has the unique capability for day-night imaging, and imaging in all weather conditions including fog and haze, and also provide information on soil moisture.
RISAT is capable of taking pictures during night as well and even in cloud-covered conditions, an expertise Indian remote sensing satellites did not have previously.
ANUSAT mission’s main objective is to involve universities in building micro satellites as a means to promote and encourage intra-disciplinary technologies with ISRO’s help. ANUSAT carries a digital store and forward payload for amateur communication.
Source : http://www.ptinews.com
Video Map Based Road Navigation Solution Launched in India
Posted: February 18, 2009 Filed under: Countries, GPS Leave a comment »VidTeq (India) Private Limited announces navigation concept based on Video Maps. Video Map is a feature rich next generation navigable map built on a traditional digital map. Video Map is a video clip of the complete route between source and destination with features such as business logos, background music, turn-by-turn audio overlay, road names etc. embedded into it. Video Map is built of individual geo-tagged video segments.
Driving directions provided traditionally consist of digital map and turn by turn text directions. These directions are easy to follow provided all the streets are marked with clearly visible street nameplates, which is usually not the case in countries like India. This is where need for visual navigation aid arises and the Video Map product would address this space.
Video Map is meant not only for navigation but is also useful for locating businesses and exploring the streets, all sitting in front of your computer.
VidTeq plans to render their service both through Portal as well as Cell phones. Initially the service will be offered only for Bangalore city. The Web service will be offered starting Feb 9th and the Cell based service will be offered in a month from then. As part of the initial service Vidteq will have Video Maps covering all the Main roads and some of the internal roads of Bangalore city.
Source : http://www.yourstory.in
Global Satellite USA launches Global Satellite Assist
Posted: February 18, 2009 Filed under: GIS, GPS, News Leave a comment »Global Satellite USA, one of the satellite solutions providers, announced the launch of Global Satellite Assist – a GPS tracking system that can be downloaded GPS enabled cell phones. By using Global Satellite Assist, boaters can have an added sense of security and peace of mind both on the water and ashore as it provides a visual story of your travels and adventures for friends and family, viewable on any internet enabled PC. You select the people who can see your location and let them know you are safe. As you travel, Global Satellite Assist advises you of the political and environmental climate before you arrive in each destination port. The system will also relay SOS emergency emails to up to 10 recipients, relay emergency SMS messages to up to 10 mobile phones, and provides 24 x 7 phone line assistance for access to emergency advice and rescue services, personal security briefing, and related crisis management services.
Source : http://megayachtnews.com






