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In the multi-channel sea surface temperature (MC SST) retrieval technique, brightness temperatures obtained from different satellite radiometer window channels viewing the same area are used to eliminate the atmospheric effects. The MC SST technique cannot be used with satellite radiometers having a single infrared window, e.g., INSAT-1.B \'HRR. In the present paper, a method has been proposed to split up the radiance received over a single channel, .10.5-12.5 /L, as a sum of two component radiances over .10.5- 11.5 and 11.5-12.5 /L bands parametrically in terms of the atmospheric water vapour content, thus allowing the MC SST algorithm to be applied if the water vapour content is known or assumed. The difference between MC SST and the single-window brightness temperature (Tsw) is defined interms of Tsw and the total atmospheric Water vapour content. Using climatological (IIOE) water vapour data, isotherms of INSAT-IB sea surface temperature over Arabian Sea, Bay of Bengal and Indian Ocean are presented for Jaruary and May. 1986. Comparison with NOAA retrievals shows good agreement. The method is meant for cloud-free areas.

ABSTRACT. Concentration of ozone near the ground has been recorded at Pune (India) since 1972 with the help of a continuous surface ozone recorder using electro-chemical sensor. The analysis of the records of winter season indicates a sharp rise in ozone amount in the forenoon around 1000 to 1200 LST. Prior to 1985  this forenoon: higher value in surface ozone concentration was followed by another maximum in the afternoon hours coinciding with the maximum temperature epoch of the day. After 1985 the surface ozone data  indicates that the forenoon peak value has become invariably higher than the afternoon value. Due to increasing concentration of anthropogenic gases in the atmosphere there is a possibility of photochemical production of ozone in the troposphere which may give rise to higher  surface ozone values,  when the meteorological conditions are favourable for the accumulation of such gases which are involved in ozone production.