NASA Technical Reports Server (NTRS) : Upper pdf

NASA Technical Reports Server (NTRS) : Upper

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This study evaluates the spatial distributions and seasonal cycles in upper tropospheric ozone (pressure range 200-500 hPa) from low to high latitudes (60S to 60N) derived from the satellite retrieval method called “Cloud Slicing.” Cloud Slicing is a unique technique for determining ozone profile information in the troposphere by combining co-located measurements of cloud-top, pressure and above-cloud column ozone. For upper tropospheric ozone, co-located measurements of Nimbus 7 Total Ozone Mapping Spectrometer (TOMS) above-cloud column ozone, and Nimbus 7 Temperature Humidity Infrared Radiometer (THIR) cloud-top pressure during 1979-1984 were incorporated. In the tropics, upper tropospheric ozone shows year-round enhancement in the Atlantic region and evidence of a possible semiannual variability. Upper tropospheric ozone outside the tropics shows greatest abundance in winter and spring seasons in both hemispheres with largest seasonal and largest amounts in the NH. These characteristics are similar to lower stratospheric ozone. Comparisons of upper tropospheric column ozone with both stratospheric ozone and a proxy of lower stratospheric air mass (i.e., tropopause pressure) from National Centers for Environmental Prediction (NCEP) suggest that stratosphere-troposphere exchange (STE) may be a significant source for the seasonal variability of upper tropospheric ozone almost everywhere between 60S and 60N except

in low latitudes around 10S to 25N where other sources (e.g., tropospheric transport, biomass burning, aerosol effects, lightning, etc.) may have a greater role

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 1/1/2002
• Year: 2002
• Book Topics/Themes: NASA Technical Reports Server (NTRS), TROPOSPHERE, OZONE, NIMBUS 7 SATELLITE, TOTAL OZONE MAPPING SPECTROMETER, INFRARED RADIOMETERS, SPATIAL DISTRIBUTION, ATMOSPHERIC CIRCULATION, BIOMASS BURNING, TROPICAL REGIONS, STRATOSPHERE, AIR MASSES, Ziemke, Jerald R., Chandra, Sushil, Bhartia, P. K

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