|
1. |
The LeadEx experiment |
|
Eos, Transactions American Geophysical Union,
Volume 74,
Issue 35,
1993,
Page 393-397
Preview
|
PDF (2895KB)
|
|
摘要:
Motivated by heightened interest in the role of polar regions in climate and global change, a group of scientists from various institutions and disciplines recently conducted a joint field study of the crack‐like openings called leads that are created by deformation of the Arctic pack ice. The study, called the Lead Experiment, known as LeadEx, was conducted during March and April 1992 in the Beaufort Sea approximately 300 km north of Deadhorse, Alaska. Sponsored by the Office of Naval Research, it was designed to clarify the effect of open leads on the polar ocean and atmosphere.Ranging from a few meters to thousands of meters wide, leads have been long considered important to the thermodynamics of the polar regions. Because a winter lead exposes relatively warm water to the cold atmosphere, either directly or through a very thin layer of ice, leads can account for half the total heat flux from the ocean [Badgley, 1966], even though they occupy less than 10% of the surface area. Open leads, thin ice (1.0 m) may contribute equally to the total heat flux [Maykut, 1978]. Because salt is rejected as seawater freezes, leads have a major effect on the salinity of the ocean mixed laye
ISSN:0002-8606
DOI:10.1029/93EO00341
年代:1993
数据来源: WILEY
|
2. |
Weather satellite activity mixed |
|
Eos, Transactions American Geophysical Union,
Volume 74,
Issue 35,
1993,
Page 394-394
Anonymous,
Preview
|
PDF (161KB)
|
|
摘要:
On August 21 at 7:15 P.M. EDT, controllers lost contact with the NOAA‐13 weather satellite due to a power system failure aboard the craft. Almost simultaneously, however, representatives of U.S. and European agencies signed an agreement promising mutual cooperation and backup of one another's geostationary weather satellites, effective when both agencies have systems in place, expected in 1995.The newest in a series of polar‐orbiting weather satellites, NOAA‐13 was launched on August 9 from Vandenburg Air Force Base, Calif., to monitor the Earth's ocean and atmosphere, collecting data for direct transmission to users around the world and to central data‐processing centers. According to officials at NASA and the National Oceanographic and Atmospheric Administration, the spacecraft showed steadily decreasing battery voltages and currents during ground passes after 3:45 EDT on August 21, although output from the solar panels remained normal. Charles E. Thienel, NASA Goddard Space Flight Center, Greenbelt, Md., stated that these circumstances indicate a failure in the circuitry between the solar arrays and the ba
ISSN:0002-8606
DOI:10.1029/93EO00606
年代:1993
数据来源: WILEY
|
3. |
Wind profiler installed in Antarctica |
|
Eos, Transactions American Geophysical Union,
Volume 74,
Issue 35,
1993,
Page 395-396
B. B. Balsley,
J. Carey,
R. F. Woodman,
M. Sarango,
J. Urbina,
R. Rodriguez,
E. Ragaini,
Preview
|
PDF (1314KB)
|
|
摘要:
A VHF (50 MHz) wind profiler was installed in Antarctica at the Peruvian Base “Machu Picchu” on King George Island from January 21 to 26. The wind profiler will provide a first look at atmospheric dynamics over the region.The profiler—the first of its kind in Antarctica—is a National Science Foundationsponsored cooperative project of the University of Colorado, the Geophysical Institute of Peru, the University of Piura (Peru), and the Peruvian Navy. This venture was also greatly facilitated by Peru's Comision Nacional de Asuntos Antartidos and Consejo Nacional de Ciencias y Tecnologia, with additional logis tics support provided by the Argentinean Navy and the Uruguayan Ai
ISSN:0002-8606
DOI:10.1029/93EO00385
年代:1993
数据来源: WILEY
|
|