What frequency grid are you running on in the two cases? If you have sensor_do and backend_do your output frequencies will be determined by you instrument backend, while if you have sensor_do = false it will be given by f_grid.
Could you attach your Q file? Ole Martin ________________________________ From: [email protected] [[email protected]] on behalf of Pauline Martinet [[email protected]] Sent: Tuesday, May 19, 2015 8:50 AM To: [email protected] Subject: [Qpack] monochromatic pencil beam calculation Hi everybody, I am used to simulate ground-based microwave spectra with qpack (22GHz to 58 GHz). I normally define a double side band average but now I would like to test my simulations with the assumption of monochromatic pencil beam. I keep the same qpack code and I only changed the variable Q.SENSOR_DO to false instead of true. However I obtain unreasonable brightness temperature in the most opaque channels of the O2 absorption band. Here is the spectrum that I simulate with the double side band average: 37.1335 36.2098 31.8496 23.8967 21.4893 18.8657 17.9993 109.5801 151.6191 249.6631 278.5141 283.6000 283.8424 283.9169 whereas this is what I obtain with a monochromatic pencil beam calculation: 36.9074 37.6239 36.9598 35.3325 33.2136 30.9684 28.8201 26.8801 25.1884 23.7449 22.5305 21.5187 20.6823 19.9959 I obtain 19K instead of 283 K for the most opaque channels, this is weird (the last 7 channels). Does anyone see what the problem is, I probably did not define all the variables needed, I just turned out the SENSOR_DO variable.. Thank you very much for your help. Best regards, Pauline ----- Météo-France ----- Dr. Pauline Martinet Chercheur CNRM/GMEI/LISA [email protected] Fixe : +33 561079031 Site web: www.sites.google.com/site/martinetpauline31 <https://www.sites.google.com/site/martinetpauline31/>
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