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Radiometric Offset Impact on L2 Anu Dudhia University of Oxford

Radiometric Offset Impact on L2 Anu Dudhia University of Oxford. Microwindow selection and error analysis has assumed uncertainty in radiometric offset error which is fully correlated (i.e., constant) with altitude, uncorrelated between microwindows, and

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Radiometric Offset Impact on L2 Anu Dudhia University of Oxford

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  1. Radiometric Offset Impact on L2 Anu Dudhia University of Oxford

  2. Microwindow selection and error analysis has assumed uncertainty in radiometric offset error which is • fully correlated (i.e., constant) with altitude, • uncorrelated between microwindows, and • of magnitude ±1 = NESR (apodised) • What would be the impact of an additional error which is • uncorrelated (i.e., randomly varying) with altitude, • fully correlated between microwindows, and • of magnitude ±1 = 20% nominal, unapodised NESR • Plots show current error analysis, plus additional systematic error in green with (solid) and without (open) continuum fitted for each microwindow

  3. Conclusions • For the assumed amplitudes (e.g., 10nW/etc for A band) altitude-varying, spectrally-correlated radiometric offsets • are effectively removed by the continuum fit, • but would have a significant impact on the retrieval if no continuum fit were applied

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