Print Email Facebook Twitter Improving soil moisture and surface turbulent heat flux estimates by assimilation of SMAP brightness temperatures or soil moisture retrievals and GOES land surface temperature retrievals Title Improving soil moisture and surface turbulent heat flux estimates by assimilation of SMAP brightness temperatures or soil moisture retrievals and GOES land surface temperature retrievals Author Lu, Y. (TU Delft Water Resources) Steele-Dunne, S.C. (TU Delft Water Resources) De Lannoy, Gabriëlle J.M. (Katholieke Universiteit Leuven) Date 2020 Abstract Surface heat fluxes are vital to hydrological and environmental studies, but mapping them accurately over a large area remains a problem. In this study, brightness temperature (TB) observations or soil moisture retrievals from the NASA Soil Moisture Active Passive (SMAP) mission and land surface temperature (LST) product from the Geostationary Operational Environmental Satellite (GOES) are assimilated together into a coupled water and heat transfer model to improve surface heat flux estimates. A particle filter is used to assimilate SMAP data, while a particle smoothing method is adopted to assimilate GOES LST time series, correcting for both systematic biases via parameter updating and for short-term error via state updating. One experiment assimilates SMAP TB at horizontal polarization and GOES LST, a second experiment assimilates SMAP TB at vertical polarization and GOES LST, and a third experiment assimilates SMAP soil moisture retrievals along with GOES LST. The aim is to examine if the assimilation of physically consistent TB and LST observations could yield improved surface heat flux estimates. It is demonstrated that all three assimilation experiments improved flux estimates compared to a no-assimilation case. Assimilating TB data tends to produce smaller bias in soil moisture estimates compared to assimilating soil moisture retrievals, but the estimates are influenced by the respective bias correction approaches. Despite the differences in soil moisture estimates, the flux estimates from different assimilation experiments are in general very similar. Subject EvaporationAtmosphere-land interactionSoil moistureSurface temperatureData assimilation To reference this document use: http://resolver.tudelft.nl/uuid:4267f8d0-b120-4bf8-9ae9-af5a82ce401b DOI https://doi.org/10.1175/JHM-D-19-0130.1 Embargo date 2020-07-31 ISSN 1525-755X Source Journal of Hydrometeorology, 21 (2), 183-203 Part of collection Institutional Repository Document type journal article Rights © 2020 Y. Lu, S.C. Steele-Dunne, Gabriëlle J.M. De Lannoy Files PDF jhm_d_19_0130.1.pdf 3.42 MB Close viewer /islandora/object/uuid:4267f8d0-b120-4bf8-9ae9-af5a82ce401b/datastream/OBJ/view