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SOIR Exercises

SOIR Exercises. A.C. Vandaele, R. Drummond, A. Mahieux, S. Robert, V. Wilquet SOIR Team @ Belgian Institute for Space Aeronomy (IASB-BIRA). Overview. Data overview tool (Orbit_Order) Plot Occultation tool (PlotOccultationPDS_0) Synthetic spectrum construction. SOIR tools (1).

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SOIR Exercises

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  1. SOIRExercises A.C. Vandaele, R. Drummond, A. Mahieux, S. Robert, V. Wilquet SOIR Team @ Belgian Institute for Space Aeronomy (IASB-BIRA)

  2. Overview • Data overview tool (Orbit_Order) • Plot Occultation tool (PlotOccultationPDS_0) • Synthetic spectrum construction

  3. SOIR tools (1) • Exercise 1: Find two orbits, one close to the equator and one close to the pole, for which CO2 626 has been measured simultaneously in transition band • 21103-00001 (orders 141, 142, 143) – low altitude • 21102-00001 (orders 148, 149, 150) – mid altitude • 10011-00001 (orders 164, 165, 166) – high altitude • Exercise 2: Find orbits for which the HDO/H2O ratio can be calculated, i.e. H2O and HDO has been measured simultaneously. Check if the latitude dependence can be studied. • HDO: orders 119 to 124 • H2O: orders 167 to 172 Check if the altitude range overlap using the PlotOccultationPDS_0 tool.

  4. SOIR tools (2) • Exercise 3: Find orbits for which the CO volume mixing ratio can be calculated simultaneously with the HCl volume mixing ratio, and who were measured between 60 and 80°N. • CO: orders 187 to 192 • HCl: orders 127 to 132 • CO2: orders 141 to 143 and 148 to 151 Check if the altitude range where the species absorb in each orbit overlap using the PlotOccultationPDS_0 tool. Check if the detector temperature was below 88 K.

  5. Synthetic spectra construction (1) • Exercise 4: The CO2 main isotopologue 626 21102-00001 vibrational transition band absorbs in diffraction order 149. Using the precalculated absorption cross section (ACS) from file (under Matlab) or (CSV file), reconstruct the synthetic spectrum using 5 adjacent orders (147 to 152).

  6. Synthetic spectra construction (2) • 4.1. Determine the wavenumber range in each order • 4.2. Calculate the ACS in each order • 4.3. Multiply by the blaze function in each order • 4.4. Multiply by the AOTF function in each order • 4.5. Convolve the spectrum • 4.6. Sum the orders • 4.7. Make the same operation with the denominator (ACS = 1) • 4.8. Perform the division • Data: • nCO2 = 1018 molec/cm3 • T = 200 K • p = 0.01 bar • Path length = 100 km • Instrument resolution = 0.15 cm-1 • Pixel to wavenumber relation

  7. Thank you for your attention

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