Agriculture
Vitamin D-licious Mushrooms
Where Have All the Bees Gone?
Watching out for vultures
Amphibians
Newts
Tree Frogs
Salamanders and Newts
Animals
Jay Watch
Ant Invasions Change the Rules
Stunts for High-Diving Ants
Behavior
A Light Delay
A Grim Future for Some Killer Whales
Math Naturals
Birds
Woodpecker
Owls
Storks
Chemistry and Materials
Supersonic Splash
Sugary Survival Skill
Pencil Thin
Computers
Earth from the inside out
Galaxies far, far, far away
A Classroom of the Mind
Dinosaurs and Fossils
Dinosaurs Grow Up
Mammals in the Shadow of Dinosaurs
Digging for Ancient DNA
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Earth
Ice Age Melting and Rising Seas
Life trapped under a glacier
A Global Warming Flap
Environment
Island Extinctions
Blooming Jellies
A Change in Leaf Color
Finding the Past
Untangling Human Origins
A Long Haul
A Big Discovery about Little People
Fish
Freshwater Fish
Hagfish
Catfish
Food and Nutrition
In Search of the Perfect French Fry
Chew for Health
Building a Food Pyramid
GSAT English Rules
Capitalization Rules
Subject and Verb Agreement
Finding Subjects and Verbs
GSAT Exam Preparation Jamaica
How are students placed after passing the GSAT exam
GSAT stars reap scholarship glory
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Exams Jamaica Scholarships
GSAT Exam Preparation
2014 GSAT Results for Jamaican Kids
GSAT Scholarship
GSAT Mathematics
It's a Math World for Animals
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
Play for Science
Human Body
Dreaming makes perfect
A Long Haul
Foul Play?
Invertebrates
Centipedes
Beetles
Spiders
Mammals
Flying Foxes
Bumblebee Bats
Little Brown Bats
Parents
Choosing a Preschool: What to Consider
Expert report highlights the importance to parents of reading to children!
How children learn
Physics
Extra Strings for New Sounds
Hold on to your stars, ladies and gentlemen
IceCube Science
Plants
Hungry bug seeks hot meal
Plants Travel Wind Highways
City Trees Beat Country Trees
Reptiles
Turtles
Snakes
Komodo Dragons
Space and Astronomy
Planning for Mars
Zooming In on the Wild Sun
Killers from Outer Space
Technology and Engineering
Smart Windows
Musclebots Take Some Steps
Space Umbrellas to Shield Earth
The Parts of Speech
Problems with Prepositions
What is a Noun
Pronouns
Transportation
Are Propellers Fin-ished?
Reach for the Sky
Seen on the Science Fair Scene
Weather
Where rivers run uphill
Weekend Weather Really Is Different
Watering the Air
Add your Article

Arctic Melt

Earth's North and South Poles are famous for being cold and icy. Last year, however, the amount of ice in the Arctic Ocean fell to a record low. Normally, ice builds in Arctic waters around the North Pole each winter and shrinks during the summer. But for many years, the amount of ice left by the end of summer has been declining. Since 1979, each decade has seen an 11.4 percent drop in end-of-summer ice cover. Between 1981 and 2000, ice in the Arctic lost 22 percent of its thickness—becoming 1.13 meters (3.7 feet) thinner. Last summer, Arctic sea ice reached its skimpiest levels yet. By the end of summer 2007, the ice had shrunk to cover just 4.2 million square kilometers (1.6 million square miles). That's 38 percent less area than the average cover at that time of year. And it's a whopping 23 percent below the previous record low, which was set just 2 years ago. This continuing trend has scientists concerned. There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer at the University of Washington in Seattle. Unusually strong winds blew through the Arctic last summer. The winds pushed much of the ice out of the central Arctic, leaving a large area of thin ice and open water. Scientists also suspect (but haven't yet documented) that fewer clouds cover the Arctic now than in the past. Clearer skies allow more sunlight to reach the ocean. The extra heat warms both the water and the atmosphere. Water in the area is definitely getting warmer. In parts of the Arctic Ocean last year, surface temperatures were 3.5° Celsius warmer than average and 1.5°C warmer than the previous record high. With both air and water getting warmer, the ice is melting from both above and below. In some parts of the Beaufort Sea, north of Alaska and western Canada, ice that measured 3.3 m (11 feet) thick at the beginning of the summer measured just 50 centimeters (20 inches) by season's end. The new measurements suggest that melting is far more severe than scientists have seen by just looking at ice cover from above, says Donald K. Perovich, a geophysicist at the U.S. Army Cold Regions Research and Engineering Laboratory in Hanover, N.H. "There's a lot less ice there than we think," he says. "And the farther we go down this path, the harder it is to get back." As more ice melts each summer, it takes longer for seawater to freeze each winter. Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.—Emily Sohn

Arctic Melt
Arctic Melt








Designed and Powered by HBJamaica.com™