Agriculture
Fast-flying fungal spores
Chicken Eggs as Drug Factories
Flush-Free Fertilizer
Amphibians
Salamanders and Newts
Toads
Poison Dart Frogs
Animals
Sea Lilies on the Run
Who's Knocking?
Ant Invasions Change the Rules
Behavior
Honeybees do the wave
A Grim Future for Some Killer Whales
Nice Chimps
Birds
Parrots
Pigeons
A Meal Plan for Birds
Chemistry and Materials
Atomic Drive
The newest superheavy in town
Batteries built by Viruses
Computers
New eyes to scan the skies
A Light Delay
Play for Science
Dinosaurs and Fossils
Downsized Dinosaurs
Dino Takeout for Mammals
The Paleontologist and the Three Dinosaurs
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Earth
What is groundwater
Island of Hope
Groundwater and the Water Cycle
Environment
Power of the Wind
Spotty Survival
Sea Otters, Kelp, and Killer Whales
Finding the Past
Writing on eggshells
Ancient Cave Behavior
Prehistoric Trips to the Dentist
Fish
Dogfish
Carp
Pygmy Sharks
Food and Nutrition
How Super Are Superfruits?
Healing Honey
Food for Life
GSAT English Rules
Order of Adjectives
Finding Subjects and Verbs
Whoever vs. Whomever
GSAT Exam Preparation Jamaica
GSAT stars reap scholarship glory
The Annual GSAT Scholarships
42,000 students will sit for the GSAT Exam in two weeks
GSAT Exams Jamaica Scholarships
GSAT stars reap scholarship glory
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Exam Preparation
GSAT Mathematics
Setting a Prime Number Record
Detecting True Art
10 Common Mistakes When Preparing for the GSAT Math Test
Human Body
Walking to Exercise the Brain
Attacking Asthma
Heart Revival
Invertebrates
Grasshoppers
Lice
Black Widow spiders
Mammals
Rhinoceros
Basset Hounds
Cornish Rex
Parents
Expert report highlights the importance to parents of reading to children!
Children and Media
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
Dreams of Floating in Space
Echoes of a Stretched Egg
Speedy stars
Plants
Surprise Visitor
Cactus Goo for Clean Water
City Trees Beat Country Trees
Reptiles
Tortoises
Caimans
Cobras
Space and Astronomy
Solving a Sedna Mystery
Big Galaxy Swallows Little Galaxy
Witnessing a Rare Venus Eclipse
Technology and Engineering
A Light Delay
Searching for Alien Life
Sugar Power for Cell Phones
The Parts of Speech
What is a Noun
Problems with Prepositions
Pronouns
Transportation
Robots on a Rocky Road
Middle school science adventures
Ready, unplug, drive
Weather
Earth's Poles in Peril
Catching Some Rays
Either Martians or Mars has gas
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™