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China's carbon satellite won the first chlorophyll fluorescence inversion map to monitor global vegetation

via:CnBeta     time:2018/3/1 8:30:59     readed:406

Li Daqing / Science and Technology Daily


China's first TanSat satellite global chlorophyll fluorescence product (July 2017, up; December 2017, under)

On December 22, 2016, China launched the first scientific experimental satellite for observing carbon dioxide, TanSat, making it the third country in the world to provide carbon satellite data. The TanSat satellite is a scientific experiment satellite project undertaken by the Ministry of Science and Technology under the Ministry of Science and Technology during the 12th Five-Year Plan period. The CASS is responsible for the overall project and a number of scientific experiments satellite programs jointly undertaken by various units to cope with global climate change and monitor the global distribution of carbon dioxide concentration. Chlorophyll fluorescence remote sensing is an important application of the satellite.

The main payload of the TanSat satellite, the Hyperspectral CO 2 detector, has three channels, of which the spectral resolution of the O2-A channel at 760 nm is up to 0.04 nm. Capable of capturing vegetation-induced chlorophyll fluorescence on Fe (758 nm ) And KI (771 nm) fill the effects of the two Fraunhofer Hoffman lines, which can not only dynamically monitor the global carbon dioxide concentration but also accurately reflect vegetation chlorophyll fluorescence. Satellite-scale chlorophyll fluorescence can accurately estimate photosynthetic productivity of the world's vegetation. Combined with simultaneous inversion of atmospheric carbon dioxide concentration data, the synergy between the two will greatly enhance the global carbon sink observation capability.

Researcher Liu Liangyun has long been engaged in the research of vegetation chlorophyll fluorescence remote sensing, which is the pioneer of chlorophyll fluorescence remote sensing research in China. The results of the first global chlorophyll fluorescence inversion successfully obtained by his team show clearly that the North American corn belt, the European plains, agricultural areas in East Asia and Southeast Asia in July 2017 and DecemberAmazonRainforests and other regions have strong vegetation productivity, and the dynamic changes of vegetation productivity and carbon sequestration capacity in the summer and winter in the northern and southern hemispheres are also very accurate.

The researchers compared the TanSat satellite chlorophyll fluorescence product of China with that of NASA's Orbital Carbon Observation 2 (OCO-2) satellite product in the same period. Their spatial pattern, seasonal variation characteristics, range of values, mean value and dynamic distribution Highly consistent. This shows that our TanSat satellite has reached the highest international level.

In order to quantitatively evaluate the potential applications of TanSat satellite chlorophyll fluorescence products in vegetation growth and productivity monitoring, researchers compared the TanSat satellite chlorophyll fluorescence products with the US OCO-2 satellite products and MODIS EVI vegetation index products. The results showed that the chlorophyll fluorescence of TanSat satellite in China had a very consistent and positive correlation with the chlorophyll fluorescence and MODIS EVI index of OCO-2 satellite, which could be used to monitor the global vegetation growth and vegetation productivity.

(Original title: China's carbon satellite obtained the first global chlorophyll fluorescence inversion map)

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