Retrieval of cloud pressure and oceanic chlorophyll content using Raman scattering in GOME ultraviolet spectra

[1] Reliable cloud pressure estimates are needed for accurate retrieval of ozone and other trace gases using satellite-borne hyperspectral backscatter ultraviolet (buv) instruments. The cloud pressures should be consistent with the assumptions made in the retrieval algorithms. Cloud pressure can be derived from buv instruments using the properties of rotational-Raman scattering (RRS) and absorption by O2-O2. Here we estimate cloud pressure using the concept of a Lambert-equivalent reflectivity (LER) surface that is also used in many trace gas retrieval algorithms. An LER cloud pressure (PLER) algorithm is being developed for the ozone monitoring instrument (OMI) that will fly on NASA EOS Aura. As a demonstration, we apply the approach to data from the global ozone monitoring experiment (GOME) in the 355–400 nm spectral range. GOME has full spectral coverage in this range at relatively high spectral resolution with a very high signal-to-noise ratio. This allows for more accurate estimates of cloud pressure than were possible with its predecessors SBUV and TOMS. We also demonstrate for the first time the retrieval of oceanic chlorophyll content using oceanic Raman scattering in buv observations. We compare our retrieved PLER with cloud top pressures, Ptop, derived from the infrared ATSR-2 instrument on the same satellite for overcast situations. The findings confirm results from previous studies that showed retrieved PLER from buv observations is systematically higher than IR-derived Ptop. Simulations using Mie-scattering radiative transfer algorithms with O2-O2 absorption show that these differences can be explained by increased absorption within and below the cloud as well as between multiple cloud decks.

[1]  James B. Burkholder,et al.  Absorption measurements of oxygen between 330 and 1140 nm , 1990 .

[2]  E. Shettle,et al.  Models for the aerosols of the lower atmosphere and the effects of humidity variations on their optical properties , 1979 .

[3]  J. Hovenier,et al.  A fast method for retrieval of cloud parameters using oxygen A band measurements from the Global Ozone Monitoring Experiment , 2001 .

[4]  J. Joiner,et al.  The determination of cloud pressures from rotational Raman scattering in satellite backscatter ultraviolet measurements , 1995 .

[5]  Pawan K. Bhartia,et al.  Two new methods for deriving tropospheric column ozone from TOMS measurements: Assimilated UARS MLS/HALOE and convective‐cloud differential techniques , 1998 .

[6]  R. Mcpeters,et al.  Effect of an improved cloud climatology on the total ozone mapping spectrometer total ozone retrieval , 1997 .

[7]  William G. Read,et al.  Effects of 1997–1998 El Niño on tropospheric ozone and water vapor , 1998 .

[8]  S. Chandra,et al.  An 11‐year solar cycle in tropospheric ozone from TOMS measurements , 1999 .

[9]  J. Burrows,et al.  Inelastic scattering in ocean water and its impact on trace gas retrievals from satellite data , 2003 .

[10]  Piet Stammes,et al.  A novel approach to the polarization correction of spaceborne spectrometers , 2003 .

[11]  Stanley C. Solomon,et al.  On the interpretation of zenith sky absorption measurements , 1987 .

[12]  G. Kattawar,et al.  Filling in of Fraunhofer lines in the ocean by Raman scattering. , 1992, Applied optics.

[13]  George W. Kattawar,et al.  Inelastic scattering in planetary atmospheres. I - The Ring effect, without aerosols , 1981 .

[14]  D. R. Bates Rayleigh scattering by air , 1984 .

[15]  P. Bhartia,et al.  Nimbus-7 Total Ozone Mapping Spectrometer (TOMS) Data Products User`s Guide , 1993 .

[16]  Ernest Hilsenrath,et al.  Scientific requirements and optical design of the ozone monitoring instrument on EOS-CHEM , 1999, Optics & Photonics.

[17]  J. Dave,et al.  Meaning of Successive Iteration of the Auxiliary Equation in the Theory of Radiative Transfer. , 1964 .

[18]  R. Stolarski,et al.  Measured Trends in Stratospheric Ozone , 1992, Science.

[19]  P. Bhartia,et al.  Rotational Raman scattering (Ring effect) in satellite backscatter ultraviolet measurements. , 1995, Applied optics.

[20]  D. Deirmendjian Electromagnetic scattering on spherical polydispersions , 1969 .

[21]  Xiong Liu,et al.  On the accuracy of Total Ozone Mapping Spectrometer retrievals over tropical cloudy regions , 2001 .

[22]  Kelly Chance,et al.  Analysis of BrO measurements from the Global Ozone Monitoring Experiment , 1998 .

[23]  T. I. Quickenden,et al.  The ultraviolet absorption spectrum of liquid water , 1980 .

[24]  John P. Burrows,et al.  RING EFFECT: IMPACT OF ROTATIONAL RAMAN SCATTERING ON RADIATIVE TRANSFER IN EARTH’S ATMOSPHERE , 1998 .

[25]  A. J. Miller,et al.  Record Low Global Ozone in 1992 , 1993, Science.

[26]  John P. Burrows,et al.  The ring effect in the cloudy atmosphere , 2001 .

[27]  K. Chance,et al.  Ring effect studies: Rayleigh scattering, including molecular parameters for rotational Raman scattering, and the Fraunhofer spectrum. , 1997, Applied optics.

[28]  E. Fry,et al.  Absorption spectrum (380-700 nm) of pure water. II. Integrating cavity measurements. , 1997, Applied optics.

[29]  P. Bhartia,et al.  Effect of molecular anisotropy on backscattered ultraviolet radiance. , 1995, Applied optics.

[30]  Carl M. Penney,et al.  Absolute rotational Raman cross sections for N2, O2, and CO2 , 1974 .

[31]  R. B. A. Koelemeijer,et al.  Effects of clouds on ozone column retrieval from GOME UV measurements , 1999 .

[32]  Lawrence E. Flynn,et al.  Long‐term ozone trends derived from the 16‐year combined Nimbus 7/Meteor 3 TOMS Version 7 record , 1996 .

[33]  Michael Eisinger,et al.  The Global Ozone Monitoring Experiment (GOME): Mission Concept and First Scientific Results , 1999 .

[34]  H. Schlager,et al.  Introduction to special section: Subsonic Assessment Ozone and Nitrogen Oxide Experiment (SONEX) and Pollution From Aircraft Emissions in the North Atlantic Flight Corridor (POLINAT 2) , 2000 .

[35]  Xiong Liu,et al.  Occurrence of ozone anomalies over cloudy areas in TOMS version-7 level-2 data , 2003 .

[36]  Benjamin M. Herman,et al.  Evaluation of the pseudo‐spherical approximation for backscattered ultraviolet radiances and ozone retrieval , 1997 .

[37]  K. Baker,et al.  Optical properties of the clearest natural waters (200-800 nm). , 1981, Applied optics.

[38]  S. Hooker An overview of SeaWiFS and ocean color , 1992 .

[39]  Soon K. Cho,et al.  Electromagnetic Scattering , 2012 .

[40]  J. Grainger,et al.  Anomalous Fraunhofer Line Profiles , 1962, Nature.

[41]  Kathleen I. Strabala,et al.  Seasonal and Diurnal Changes in Cirrus Clouds as Seen in Four Years of Observations with the VAS , 1992 .

[42]  W. Rossow,et al.  ISCCP Cloud Data Products , 1991 .

[43]  Pawan K. Bhartia,et al.  “Cloud slicing”: A new technique to derive upper tropospheric ozone from satellite measurements , 2001 .

[44]  James F. Gleason,et al.  Ocean Raman scattering in satellite backscatter UV measurements , 2002 .