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Retrieval of cloud pressure and chlorophyll content using raman scattering in gome ultraviolet spectra
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Flittner, David Gleason Sr., James Bhartia, P. K. Vasikov, Alexander Joiner, Joanna Atlas, Robert Technical Monitor |
| Copyright Year | 2002 |
| Description | Reliable cloud pressure estimates are needed for accurate retrieval of ozone and other trace gases using satellite-borne backscatter ultraviolet (buv) instruments such as the global ozone monitoring experiment (GOME). Cloud pressure can be derived from buv instruments by utilizing the properties of rotational-Raman scattering (RRS) and absorption by O2-O2. In this paper we estimate cloud pressure from GOME observations in the 355-400 nm spectral range using the concept of a Lambertian-equivalent reflectivity (LER) surface. GOME has full spectral coverage in this range at relatively high spectral resolution with a very high signal-to-noise ratio. This allows for much more accurate estimates of cloud pressure than were possible with its predecessors SBUV and TOMS. We also demonstrate the potential capability to retrieve chlorophyll content with full-spectral buv instruments. We compare our retrieved LER cloud pressure with cloud top pressures derived from the infrared ATSR instrument on the same satellite. The findings confirm results from previous studies that showed retrieved LER cloud pressures from buv observations are systematically higher than IR-derived cloud-top pressure. Simulations using Mie-scattering radiative transfer algorithms that include O2-O2 absorption and RRS show that these differences can be explained by increased photon path length within and below cloud. |
| File Size | 1701799 |
| Page Count | 45 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030025444 |
| Archival Resource Key | ark:/13960/t8gf5rp6p |
| Language | English |
| Publisher Date | 2002-12-01 |
| Access Restriction | Open |
| Subject Keyword | Meteorology And Climatology Raman Spectra High Resolution Solar Backscatter Uv Spectrometer Ultraviolet Spectra Ozone Photons Computerized Simulation Mie Scattering Chlorophylls Dissolved Organic Matter Spectral Resolution Total Ozone Mapping Spectrometer Clouds Meteorology Absorption Spectra Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
