Atmospheric Measurement Techniques (Jul 2012)

Seven years of global retrieval of cloud properties using space-borne data of GOME

  • L. Lelli,
  • A. A. Kokhanovsky,
  • V. V. Rozanov,
  • M. Vountas,
  • A. M. Sayer,
  • J. P. Burrows

DOI
https://doi.org/10.5194/amt-5-1551-2012
Journal volume & issue
Vol. 5, no. 7
pp. 1551 – 1570

Abstract

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We present a global and regional multi-annual (June 1996–May 2003) analysis of cloud properties (spherical cloud albedo – CA, cloud optical thickness – COT and cloud top height – CTH) of optically thick (COT > 5) clouds, derived using measurements from the GOME instrument on board the ESA ERS-2 space platform. We focus on cloud top height, which is obtained from top-of-atmosphere backscattered solar light measurements in the O<sub>2</sub> A-band using the Semi-Analytical CloUd Retrieval Algorithm SACURA. The physical framework relies on the asymptotic equations of radiative transfer. The dataset has been validated against independent ground- and satellite-based retrievals and is aimed to support trace-gases retrievals as well as to create a robust long-term climatology together with SCIAMACHY and GOME-2 ensuing retrievals. We observed the El Niño-Southern Oscillation anomaly in the 1997–1998 record through CTH values over the Pacific Ocean. The global average CTH as derived from GOME is 5.6 ± 3.2 km, for a corresponding average COT of 19.1 ± 13.9.