Arctic Sea Ice Reaches 2008 Lowest Coverage17/09/2008 |
| Arctic sea ice coverage appears to have reached its lowest extent for the year and the second-lowest amount recorded since the dawn of the satellite era, according to observations from the NASA-supported National Snow and Ice Data Center at the University of Colorado in Boulder. |
|
While slightly above the record-low minimum set 16th September 2007, this season further reinforces the strong negative trend in summer sea ice extent observed during the past 30 years. Before last year, the previous record low for September was set in 2005. In March, when the Arctic reached its annual maximum sea ice coverage during the winter, scientists from NASA and the data center reported that thick, older sea ice was continuing to decline. According to NASA-processed satellite microwave data, this perennial ice used to cover 50-60 percent of the Arctic, but this winter it covered less than 30 percent. Perennial sea ice is the long-lived layer of ice that remains even when the surrounding short-lived seasonal sea ice melts to its minimum extent during the summer. NASA scientists have been observing Arctic sea ice cover since 1979. NASA developed the capability to observe the extent and concentration of sea ice from space using passive microwave sensors. The National Snow and Ice Data Center will issue an analysis of the possible causes behind this year's Arctic sea ice conditions during the first week of October. NASA animations and graphics on current Arctic sea ice conditions
Read more about: Current Ice Supplier: NASA HQ Science Miss. Directorate More news from this supplier: 'Merging Tsunami' Doubled Japanese Destruction NASA Continues Critical Survey Of Antarctica's Changing Ice Arctic Sea Ice Hits Second-lowest Level NASA Polar Observation Satellite Preparing for Launch First Complete Map Of Antarctic Ice Flow Second Leg Arctic Ocean Research NASA Air Watch on Arctic Ice Earth's Lakes Are Warming NASA Airborne Science Campaign Begins Antarctic Sequel Tsunami Prediction System Demonstration Award for Brazilian Hydrographic Paper Demonstrating "Deeper Understanding" First Real-Time Seafloor Earthquake Observatory Theme Hydrography Day 2012 International Cooperation Finistere and Mediterranean Bathymetric Lidar Surveys Precise Positioning For BP Vessels DP Inertial Navigation System for Drillship Plug-and-work Protocol Adopted Simulator Models Complex Sea Currents Monitoring the Shipwrecked Concordia 
Comments (0): |
| News |
| News > Arctic Sea Ice Reaches 2008 Lowest Coverage |
|
Interactive |
Hydrographic Survey for Riverbed Erosion |
U.S. Geological Survey were out on the Missouri River at Williston, North Dakota, USA, performing a hydrographic survey to monitor the state of riverbed erosion. They were using a multibeam echo sounder which transmits sound energy and analyzes the return signal (echo) that has bounced off the riverbed or other objects. Multibeam sonars emit sound waves from directly beneath a ship's hull to produce fan-shaped coverage of the riverbed.
|
| Last 5 items: |
| Hydrographic Survey for Riverbed Erosion |
| Introduction to GEBCO |
| MCA on Surveying the British Coast |
| Surveying in the Port of London |
| Venessa O'Connell on Hydrography |
