Earth Explorer 3 – CryoSat-2

The European Space Agency's Earth Explorer 3 mission, CryoSat-2, was launched on April 8, 2010, with the aim of studying the Earth's polar regions and monitoring changes in the thickness of ice sheets and sea ice. This mission was a continuation of the CryoSat-1 mission, which failed shortly after launch in 2005 due to a launch vehicle malfunction. In this article, we will delve deeper into the history, goals, implementation, costs, and achievements of the CryoSat-2 mission.

Background

The CryoSat-1 mission was the first satellite dedicated to measuring the thickness of polar ice sheets and sea ice using a radar altimeter. The mission was designed to address an important scientific question: how much ice is being lost from the polar ice sheets and how quickly? The mission was launched in 2005, but unfortunately, a failure in the launch vehicle led to the mission's premature end. The loss of CryoSat-1 was a significant setback for the scientific community, but it also provided an opportunity to improve the design and implementation of the mission. The European Space Agency began work on CryoSat-2, which was launched in 2010.

Goals

The main goal of the CryoSat-2 mission was to measure changes in the thickness of ice sheets and sea ice in the Arctic and Antarctic. The satellite carried a radar altimeter, which measured the height of the ice surface above the sea level. By comparing these measurements over time, scientists could determine whether the ice was thickening or thinning. The data gathered by CryoSat-2 was expected to improve our understanding of the polar regions' response to climate change and its potential impact on global sea levels.

CryoSat-2 was designed to provide measurements of ice thickness with an accuracy of about 1 cm, significantly higher than that of the previous generation of altimeters. The satellite also carried a radio receiver to measure the thickness of sea ice, which could help scientists understand how much of the ice cover was being lost due to melting.

Implementation

CryoSat-2 was launched on April 8, 2010, from the Baikonur Cosmodrome in Kazakhstan on a Dnepr rocket. The satellite was placed into a polar orbit at an altitude of 717 km. The orbit was designed to cover the polar regions, with a repeat cycle of 369 days. This repeat cycle ensured that the satellite would pass over the same location on the Earth's surface at approximately the same time each year, providing the opportunity to compare measurements taken at different times.

CryoSat-2 was designed to operate for at least three years, with the potential for up to five years of operation. The satellite's data was transmitted to the European Space Operations Centre in Darmstadt, Germany, where it was processed and made available to the scientific community.

Costs

The cost of the CryoSat-2 mission was approximately €140 million. This cost included the development, launch, and operation of the satellite. The mission was funded by the European Space Agency and contributions from various national space agencies, including the UK, Germany, France, Italy, and Sweden.

Achievements

The CryoSat-2 mission has been a resounding success. The satellite has provided a wealth of data on the thickness of ice sheets and sea ice in the polar regions. One of the most significant achievements of the mission was the measurement of the thickness of the Antarctic ice sheet, which is the largest ice sheet on the planet. Prior to CryoSat-2, there was a significant amount of uncertainty about the thickness of the ice sheet. The satellite's measurements have improved our understanding of the ice sheet's dynamics and how it is responding to climate change.

Another major achievement of the CryoSat-2 mission was the measurement of the Arctic sea ice thickness. The satellite's measurements have revealed a significant decline in the thickness of sea ice in the Arctic region over the past decade. This decline is consistent with the effects of global warming and has important implications for the Arctic ecosystem and its inhabitants.

CryoSat-2 has also provided valuable data for climate models, which are used to predict future climate change. The satellite's measurements have improved the accuracy of these models, particularly in the polar regions, where the impacts of climate change are most pronounced.

In addition to its scientific achievements, the CryoSat-2 mission has also had practical applications. The satellite's data has been used by the shipping industry to plan routes through ice-covered waters, reducing the risk of accidents and environmental damage. The data has also been used by governments to monitor changes in the polar regions and to inform policies on climate change.

Overall, the CryoSat-2 mission has been a significant success. The satellite has provided a wealth of data on the thickness of ice sheets and sea ice in the polar regions, improving our understanding of the impacts of climate change on these sensitive ecosystems. The data has practical applications and has been used to inform policies on climate change and to reduce the risks associated with shipping in ice-covered waters. The mission has demonstrated the importance of investing in scientific research and the value of international cooperation in addressing global challenges.