A new satellite to help provide insight into one of the more controversial environmental issues being faced today failed to reach orbit to begin its mission to monitor crucial changes in Earth's polar ice caps because its rocket booster's flight computer had a missing command.

Cryosat lifted off at 1502 GMT (11:02 a.m. EDT) Saturday aboard a Rockot vehicle originating from the Russian Plesetsk Cosmodrome located in the nation's far north. The joint European-Russian Eurockot firm provided the launcher, which is largely derived from the Russian SS-19 missile used by military forces.

However, problems arose before the rocket reached its target altitude for deployment of Cryosat, and the $170 million satellite fell into the Arctic Ocean near the North Pole before completing its first orbit of Earth.

"Preliminary analysis of the telemetry data indicates that the first stage performed nominally. The second stage performed nominally until main engine cut-off was to occur. Due to a missing command from the onboard flight control system the main engine continued to operate until depletion of the remaining fuel," the satellite's owner, the European Space Agency, said in a statement announcing the launch failure.

"As a consequence, the separation of the second stage from upper stage did not occur. Thus, the combined stack of the two stages and the CryoSat satellite fell into the nominal drop zone north of Greenland close to the North Pole into high seas with no consequences to populated areas.

"An investigating commission by the Russian State authorities has been established to further analyze the reasons for the failure, results are expected within the next weeks. This commission will work in close cooperation with a failure investigation board consisting of Eurockot, ESA and Khrunichev representatives."

Plans called for Cryosat to be released at 1636 GMT (12:36 p.m. EDT) after two burns of the Rockot's Breeze-KM upper stage. The first two stages of the rocket were to complete their role in the flight within the first five minutes after launch.

Russian ground stations were expected to lose communications with the launcher at eight minutes after liftoff, but the Redu site in Belgium was scheduled to acquire signals from the Breeze upper stage and Cryosat just a few minutes before spacecraft separation.

But only silence was heard, immediately prompting concern that something had gone wrong.

"We have no information on what the status of the mission is - whether separation has taken place or not and whether the satellite is healthy," said Volker Liebig, ESA's Director of Earth Observation, said earlier in the day amid confusion over what had happened.

Within six hours of liftoff, ESA officials announced CryoSat was gone.

"Jury Bakhvalov, first deputy director general of the Khrunichev Space Center on behalf of the Russian State Commission officially confirmed that the launch of CryoSat ended in a failure due to an anomaly in the launch sequence and expressed his regret to ESA and all partners involved," the ESA statement said.

This was the sixth commercial launch of the Rockot booster since 2000. The previous five had been successful for the marketing firm Eurockot. What impact Saturday's failure will have on plans to launch a Korean science satellite in December is not immediately clear.

Europe's Cryosat satellite was to begin its three-year mission Saturday to fly over the polar regions using a sophisticated radar altimeter to determine the thickness and mass of fragile land and sea ice sheets and their rates of change.

Cryosat was to fly in a circular orbit almost 450 miles high with an inclination of 92 degrees, allowing the observation platform to pass almost directly above the poles.

The 1,500-pound satellite carried a radar instrument to pierce thick ice sheets to precisely measure their thickness as it changes over time. The Synthetic Aperture Interferometric Radar Altimeter device featured an operating mode to improve resolution above earlier experiments probing polar ice, and was the first radar altimeter ever exclusively designed to study the frozen ice masses.

The radar would have worked by sending short pulses toward the surface and measuring the time it takes for the pulse to be reflected back to receivers aboard Cryosat.

With two antennas, SIRAL was to determine depths within just a few tens of centimeters, an unprecedented level of resolution. The 136-pound instrument was largely based on the Poseidon 2 altimeter currently aboard the U.S.-French Jason mission.

The Ku-band radar included several improvements that make SIRAL unique, including a second antenna that provides the across-track interferometry needed to augment results in rough terrain on the edges of large ice masses.

Cryosat also included a radio receiver that gathers data from several dozen ground sites around the world to provide position data to further refine measurements from the craft's radar instrument. This information would have been needed to help correlate SIRAL data with geographical location on Earth.

Scientists are seeking data on changes in Earth's ice caps to help their studies of global warming and its affect on the planet's climate and sea levels. Land ice covering most of Greenland and Antarctica are somewhat protected from melting by their sheer size, while more sensitive ocean ice sheets are more rapidly thinning in the Arctic Ocean and on the periphery of Antarctica.

For example, estimates are that if all ice on Antarctica and Greenland were to melt, Earth's sea level would rise up to 200 feet. In addition, temperatures would significantly rise and climates across the globe would be impacted.

Cryosat was to attempt to answer fundamental questions in climatology and global warming, such as whether the reports of shrinkage of ice sheets was true on a global scale, whether this has been induced by global climate change, and how long it will be until this issue begins to affect human society.

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