Top-of-Atmosphere Shortwave and Longwave Broadband Fluxes Derived using Various Satellites over ARM Domains

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Description

Ongoing efforts towards a continuous satellite-derived cloud and radiative property dataset over the ARM domains are facilitated by use of the VISST (Visible Infrared Solar Split-Window Technique) satellite retrieval algorithm. Top-of-Atmosphere (TOA) broadband (BB) shortwave (SW) and longwave (LW) fluxes fluxes are currently calculated from empirically derived narrowband-to-broadband (NB-BB) conversion coefficients, derived from matched satellite narrowband fluxes and either ERBE (Earth’s Radiant Budget Experiment) or CERES (Clouds and the Earth's Radiant Energy System) broadband fluxes. Typically these NB-BB conversions have been created for geostationary satellite platforms. However, polar-orbiting satellites such as the NOAA-xx series can cover a wide range of areas that fill in gaps in geostationary coverage. These include polar regions such as the North Slope of Alaska (NSA), and other areas where geostationary satellite coverage is sparse or presents challenges, such as over Gan Island during the AMIE (ARM MJO Investigation Experiment) campaign. TOA fluxes derived from both geostationary and polar-orbiting satellites will be presented. MTSAT2- derived TOA fluxes over the ARM Tropical Western Pacific (TWP), calculated using 2011-2012 CERES and MTSAT2 NB-BB conversions, will be shown. NB-BB conversions have been developed to apply to AVHRR data, including coincident ERBE and NOAA-9 AVHRR data from 1986, as well as CERES and NOAA-18 data from 2008. TOA fluxes derived from the AVHRR (Advanced Very High Resolution Radiometer) aboard NOAA-18, covering Gan Island during AMIE, will be presented and validated.