Abstract
Two different products from Atmospheric Infrared Sounder (AIRS) with different number of vertical levels were evaluated for their ability to identify near-surface temperature inversion in a case study over New Delhi during a winter month of November–December 2010, when the city is dominated by morning dense fog due to temperature inversion. The standard product with 28 vertical levels and the support product with 100 vertical levels from AIRS were used to study the early morning temperature profile and to compare it with the temperature profile measured by the radiosonde. It was found that the AIRS support product with more vertical levels includes more information than the AIRS standard product that has only 28 vertical levels. The support product identifies more accurately the inversion depth and strength compared with the standard product. We also compared the radiosonde profiles showing near-surface temperature inversion with the temperature profiles retrieved from Advanced TIROS Operational Vertical Sounder (ATOVS). Comparison with ATOVS shows that the hyperspectral sounder such as AIRS provides more information about the temperature inversion.
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