The CM SAF TOA Radiation Data Record Using MVIRI and SEVIRI

Abstract

Abstract:The CM SAF Top of Atmosphere (TOA) Radiation MVIRI/SEVIRI Data Record provides a homogenised satellite-based climatology of TOA Reflected Solar (TRS) and Emitted Thermal (TET) radiation in all-sky conditions over the Meteosat field of view. The continuous monitoring of these two components of the Earth Radiation Budget is of prime importance to study climate variability and change. Combining the Meteosat MVIRI and SEVIRI instruments allows an unprecedented temporal (30 min/15 min) and spatial (2.5 km/3 km) resolution compared to, e.g., the CERES products. It also opens the door to the generation of a long data record covering a 32 years time period and extending from 1 February 1983 to 30 April 2015. The retrieval method used to process the CM SAF TOA Radiation MVIRI/SEVIRI Data Record is discussed. The overlap between the MVIRI and GERB instruments in the period 2004-2006 is used to derive empirical narrowband to broadband regressions. The CERES TRMM angular dependency models and theoretical models are respectively used to compute the TRS and TET fluxes from the broadband radiances. The TOA radiation products are issued as daily means, monthly means and monthly averages of the hourly integrated values (diurnal cycle). The data is provided on a regular grid at a spatial resolution of 0.05 degrees and covers the region 70 • N-70 • S and 70 • W-70 • E. The quality of the data record has been evaluated by intercomparison with several references. In general, the stability in time of the data record is found better than 4 Wm −2 and most products fulfill the predefined accuracy requirements.

Performance Assessment of the COMET Cloud Fractional Cover Climatology across Meteosat Generations

“…The CM SAF cLouds, Albedo and Radiation dataset from the AVHRR (CLARA-A2) data record [10] is the second edition of the CM SAF's global data record of cloud, surface albedo and surface radiation products derived from homogenized measurements of AVHRR on board the polar orbiting NOAA (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) and Metop (A) satellites. Herein, we used CFC monthly means compiled from all AVHRR sensors over a time period 1982-2015 and provided by CM SAF on a global regular latitude-longitude grid with 0.25 degree resolution.…”

Retrieval of Reflected Shortwave Radiation at the Top of the Atmosphere Using Himawari-8/AHI Data

“…), are used to conduct research on understanding the effects of aerosols [61] and clouds [62], which have large temporal and spatial variabilities, on radiation [18]. It can also be applied as basic input for numerical prediction and climate models, which will contribute to improving the accuracy of the calculation [63] and further monitoring of radiation balance to understand the mechanism of climate change [64]. As a preliminary study for the radiative element output of GK-2A/AMI, the successor satellite of the Republic of Korea, this study will guide future research and development of the sensor.…”

Evaluation of Five Satellite Top-of-Atmosphere Albedo Products over Land

“…The long data record is helpful in analyzing the changes in the Earth's energy budget during the past several decades. Narrowband to broadband regressions have been derived based on the overlap between the MVIRI and Geostationary Earth Radiation Budget instruments from 2004 to 2006, and the CERES Tropical Rainfall Measurement Mission (TRMM) ADMs have been used to compute the TOA reflected solar radiation from the broadband radiances [16]. The products include daily means, monthly means, and monthly averages of the hourly integrated values.…”

“…Estimation of TOA albedo from remote sensing data is a unique means to generate TOA albedo products at regional or global scales. Different algorithms have been proposed to estimate TOA albedo from satellite data, and multiple TOA albedo products from both broadband and narrowband sensors have been developed [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], some of which have a relatively high spatial resolution that is helpful in studying the energy budget at regional scales [15][16][17].…”

“…For instance, Wang and Liang [15] have developed TOA albedo products over land based on Moderate Resolution Imaging Spectroradiometer (MODIS) data (TAL-MODIS) and compared them to CERES data. Urbain et al [16] released the Climate Monitoring Satellite Application Facility (CM SAF) TOA radiation MVIRI/SEVIRI data record and made intercomparisons to the CERES data. Song et al [17] developed a long-term record of TOA albedo over land from Advanced Very High Resolution Radiometer (AVHRR) data (TAL-AVHRR) and compared it to both CM SAF and CERES data.…”