ESA’s EarthCARE satellite has been launched, marking a significant advancement in our understanding of how clouds and aerosols impact our climate. This remarkable satellite began its mission on 29 May at 00:20 CEST (28 May, 15:20 local time), launched aboard a Falcon 9 rocket from the Vandenberg Space Force Base in California, USA. Just ten minutes post-launch, EarthCARE separated from the rocket, and at 01:14 CEST, the Hartebeesthoek ground station in South Africa received the first signal confirming its successful orbit.
As the climate crisis becomes increasingly urgent, EarthCARE, short for Earth Cloud Aerosol and Radiation Explorer, is set to deliver essential data on the interactions between clouds, aerosols, and radiation within Earth’s atmosphere. This mission represents a joint venture between ESA and the Japan Aerospace Exploration Agency (JAXA).
ESA’s Director of Earth Observation Programmes, Simonetta Cheli, highlighted the mission’s significance, describing EarthCARE as the most complex of ESA’s research missions to date. She acknowledged the crucial cooperation with JAXA, which contributed the cloud profiling radar instrument, and praised the collective efforts of all involved space industry teams. Cheli emphasized the mission’s critical timing for advancing scientific knowledge to address climate change.
JAXA’s Project Manager for the cloud profiling radar, Eiichi Tomita, emphasized the mission’s potential to enhance the accuracy of global climate models. By utilizing EarthCARE data, better climate predictions and necessary mitigation measures can be achieved. Tomita noted that the radar, the world’s first to measure the velocity of cloud flows, promises remarkable data products.
Clouds, often perceived as simple weather phenomena, play a complex and not fully understood role in atmospheric heating and cooling. They reflect solar energy back into space while trapping infrared energy, resulting in either cooling or warming effects. The impact of clouds on climate depends on various factors, including their shape, location, altitude, water content, and particle size.
Aerosols, tiny particles like dust and pollutants suspended in the atmosphere, significantly influence Earth’s climate. They affect climate directly by reflecting and absorbing solar radiation and indirectly by serving as nuclei for cloud formation. Human activities, such as industrial processes, transportation, and agriculture, are altering aerosol concentrations, affecting regional climate patterns.
Although clouds and aerosols currently exert a cooling effect, changes and feedback loops driven by the climate crisis could diminish this potential, exacerbating climate change. EarthCARE’s mission aims to address these uncertainties.
Equipped with four state-of-the-art instruments, EarthCARE will provide comprehensive data on clouds and aerosols. The cloud profiling radar will offer insights into the vertical structure and dynamics of clouds. The atmospheric lidar will deliver profiles of aerosols and thin clouds, and the multispectral imager will provide a wide-scene overview in multiple wavelengths. Additionally, the broadband radiometer will measure reflected solar radiation and outgoing infrared radiation.
These instruments will work in unison to offer a holistic view of the interplay between clouds, aerosols, and radiation, providing new insights into Earth’s radiation balance amid the climate crisis. EarthCARE is now under the control of ESA’s European Space Operations Centre in Darmstadt, Germany, where controllers will meticulously check and calibrate the mission during its commissioning phase.
The satellite’s development involved a consortium of over 75 companies, with Airbus serving as the prime contractor. This collaboration underscores the global effort and technological expertise dedicated to enhancing our understanding of climate dynamics through the EarthCARE mission.