Assimilation of SAPHIR radiance: impact on hyperspectral radiances in 4D-VAR

Indira Rani S.; Amy Doherty; Nigel Atkinson; William Bell; Stuart Newman; Richard Renshaw; John P. George; E. N. Rajagopal

doi:10.1117/12.2222781

30 April 2016 Assimilation of SAPHIR radiance: impact on hyperspectral radiances in 4D-VAR

Indira Rani S., Amy Doherty, Nigel Atkinson, William Bell, Stuart Newman, Richard Renshaw, John P. George, E. N. Rajagopal

Author Affiliations +

Proceedings Volume 9880, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques and Applications VI; 98800M (2016) https://doi.org/10.1117/12.2222781
Event: SPIE Asia-Pacific Remote Sensing, 2016, New Delhi, India

Abstract

Assimilation of a new observation dataset in an NWP system may affect the quality of an existing observation data set against the model background (short forecast), which in-turn influence the use of an existing observation in the NWP system. Effect of the use of one data set on the use of another data set can be quantified as positive, negative or neutral. Impact of the addition of new dataset is defined as positive if the number of assimilated observations of an existing type of observation increases, and bias and standard deviation decreases compared to the control (without the new dataset) experiment. Recently a new dataset, Megha Tropiques SAPHIR radiances, which provides atmospheric humidity information, is added in the Unified Model 4D-VAR assimilation system. In this paper we discuss the impact of SAPHIR on the assimilation of hyper-spectral radiances like AIRS, IASI and CrIS. Though SAPHIR is a Microwave instrument, its impact can be clearly seen in the use of hyper-spectral radiances in the 4D-VAR data assimilation systems in addition to other Microwave and InfraRed observation. SAPHIR assimilation decreased the standard deviation of the spectral channels of wave number from 650 -1600 cm^-1 in all the three hyperspectral radiances. Similar impact on the hyperspectral radiances can be seen due to the assimilation of other Microwave radiances like from AMSR2 and SSMIS Imager.

Citation Download Citation

Indira Rani S., Amy Doherty, Nigel Atkinson, William Bell, Stuart Newman, Richard Renshaw, John P. George, and E. N. Rajagopal "Assimilation of SAPHIR radiance: impact on hyperspectral radiances in 4D-VAR", Proc. SPIE 9880, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques and Applications VI, 98800M (30 April 2016); https://doi.org/10.1117/12.2222781

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