China’s first dedicated mission to monitor Carbon Dioxide in Earth’s atmosphere blasted off atop a Long March 2D rocket on Wednesday, embarking on a three-year mission designed to inform Chinese policy makers in the continued effort to reduce emissions of the greenhouse gas while also studying its role in global climate change.
The 620-Kilogram TanSat spacecraft hosts a pair of instruments to measure atmospheric carbon dioxide accurate to 4 parts per million and deliver a resolution of 1 by 2 Kilometers, detecting CO2 by the same absorption lines that make it a prime contributor to global warming. The mission’s main instrument is a high-resolution spectrometer tuned to the two near-infrared absorption bands of carbon dioxide plus a third channel covering the Oxygen A-Band.
TanSat’s spectrometer collects data across a 20-Kilometer wide ground swath with a global revisit time of 16 days which, in case of events of interest, can be reduced by the instrument’s off-nadir imaging function. The second instrument on the TanSat spacecraft is a supporting Cloud and Aerosol Polarimetry Imager covering a wide ground swath of 400 Kilometers and collecting imagery at an 0.5-Kilometer resolution in five spectral bands from ultraviolet to near-infrared. This data will be used to correct measurements from the spectrometers which can be contaminated when clouds and suspended particles are in the air. TanSat’s combined instrument is hoped to deliver CO2 dry air mole fraction accurate to 1ppm once fully calibrated.
Riding shotgun with TanSat atop the Long March 2D rocket was a group of three small satellites, including two 40-centimeter tall hyper-spectral Earth-Imaging satellites. The two satellites, referred to as Spark01 & Spark02, each host seven solar panels to deliver 130 Watts of power for the operation of a hyperspectral-imaging payload delivering image data across a 102-Kilometer swath. According to press reports, the two satellites will be operated in close coordination to broaden the ground coverage area to 200 Kilometers with data primarily used for environmental monitoring, agriculture and land-use assessments.
nice .... civilian satellites with 0.5 resolution, so it is obvious the Chiese military will have much better than 0.5m resolutionGaojing (Superview) 1&2 optical satellites launched