Infrared Channel of the Driada Spectrometer for Greenhouse-Gas Measurement from Space

The concept of a high aperture near-infrared cross-dispersion echelle-spectrometer is presented for greenhouse gases remote measurements from space. This task is of a global nature, industrial and household emissions are anthropogenic sources of greenhouse-gas emissions. In recent years, average levels of carbon (CO 2 ) and methane (CH 4 ) have continued to increase, reaching levels of 410 ppm and 1877 ppb, respectively, to date. Obtaining objective information about the state of the carbon balance in the atmosphere is possible only with the use of space-based instruments. The Driada instrument consists of three channels. The main one is a high-resolution spectrometer for the 1.4- to 1.67-μm wavelength range and is designed to measure CO 2 absorption lines at 1.58 and 1.6 μm, CH 4 lines at 1.65 μm, and a number of H 2 O lines. Two additional channels are designed to measure the O 2 band at 0.76 μm and aerosol characterization. The scientific tasks and key parameters of the main infrared channel are discussed.