Abstract
The aim of this work is assessment of regional atmospheric influence on satellite derivation of Adriatic Sea surface temperature (SST). To this end the European Centre for Medium-Range Weather Forecast (ECMWF) ERA-40 reanalysis dataset has been employed to provide the temperature and humidity profiles and surface data, while the RTTOV 8.7 radiative transfer model was used to calculate the top-of-atmosphere brightness temperatures for the advanced very high-resolution radiometer (AVHRR) channels. Ten ERA-40 grid points over the Adriatic Sea were used in the analysis, providing 29,590, 00 UTC and 12 UTC, clear-sky profiles. Climatological analysis of the ERA-40 profiles demonstrated distinct seasonal variability over the Adriatic Sea. Seasonality noted in the temperature and specific humidity profiles also evinced in the atmospheric transmittance, thermal channels temperature deficit, and derived γ and ρ parameters. A multivariate analysis was applied to relate the simulated top-of-atmosphere brightness temperatures to the Adriatic SSTs in order to generate exploratory sets of SST retrieval coefficients. All derived coefficient sets exhibited smaller noise amplification factor than the global counterpart. A test comparison of satellite-derived SST with an 11-month in situ SST series showed than locally derived coefficients provide smaller scatter (improved precision), and skin-centred bias that requires additional adjustment. Almost identical SST residual and error metric was obtained with seasonally adjusted classical split-window coefficients and with coefficients explicitly accommodating water-vapor dependence. Comparison with data reinforces the notion that the atmosphere over the Adriatic may exhibit variability that cannot be fully accommodated by globally adjusted correction.
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Acknowledgments
This work has been supported by the Croatian Ministry of Science, Education, and Sports through research grant 098-0982705-2707. The ECMWF kindly allowed access to their ERA-40 data. Dr. John Sapper provided the NOAA/NESDIS global coefficients. The authors are grateful to INAgip and Croatian Hydrographical Institute for making available the SST data collected at the Ivana-A platform. Two reviewers provided constructive and insightful comments that greatly improved the manuscript.
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Tomažić, I., Kuzmić, M. ERA-40-aided assessment of the atmospheric influence on satellite retrieval of Adriatic Sea surface temperature. Meteorol Atmos Phys 104, 37–51 (2009). https://doi.org/10.1007/s00703-008-0015-2
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DOI: https://doi.org/10.1007/s00703-008-0015-2