Impact of TROPICS Radiances on Tropical Cyclone Prediction in an OSSE

Christophersen, Hui W.; Dahl, Brittany A.; Dunion, Jason P.; Rogers, Robert F.; Marks, Frank D.; Atlas, Robert; Blackwell, William J.

doi:10.1175/MWR-D-20-0339.1

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Impact of TROPICS Radiances on Tropical Cyclone Prediction in an OSSE

2021
By Christophersen, Hui W. ; Dahl, Brittany A. ; Dunion, Jason P. ; ...
Source: Monthly Weather Review, 149(7), 2279-2298

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Journal Title:

Monthly Weather Review
Personal Author:

Christophersen, Hui W. ; Dahl, Brittany A. ; Dunion, Jason P. ; Rogers, Robert F. ; Marks, Frank D. ; ... More +

Christophersen, Hui W. ; Dahl, Brittany A. ; Dunion, Jason P. ; Rogers, Robert F. ; Marks, Frank D. ; Atlas, Robert ; Blackwell, William J. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

As part of the NASA Earth Venture-Instrument program, the Time-Resolved Observations of Precipitationstructure and storm Intensity with a Constellation of Smallsats (TROPICS) mission, to be launched in January 2022, willdeliver unprecedented rapid-update microwave measurements over the tropics that can be used to observe the evolution ofthe precipitation and thermodynamic structure of tropical cyclones (TCs) at meso- and synoptic scales. TROPICS consistsof six CubeSats, each hosting a passive microwave radiometer that provides radiance observations sensitive to atmospherictemperature, water vapor, precipitation, and precipitation-sized ice particles. In this study, the impact of TROPICS all-skyradiances on TC analyses and forecasts is explored through a regional mesoscale observing system simulation experiment(OSSE). The results indicate that the TROPICS all-sky radiances can have positive impacts on TC track and intensityforecasts, particularly when some hydrometeor state variables and other state variables of the data assimilation system thatare relevant to cloudy radiance assimilation are updated. The largest impact on the model analyses is seen in the humidityfields, regardless of whether or not there are radiances assimilated from other satellites. TROPICS radiances demonstratelarge impact on TC analyses and forecasts when other satellite radiances are absent. The assimilation of the all-skyTROPICS radiances without default radiances leads to a consistent improvement in the low- and midtropospheric tem-perature and wind forecasts throughout the 5-day forecasts, but only up to 36-h lead time in the humidity forecasts at allpressure levels. This study illustrates the potential benefits of TROPICS data assimilation for TC forecasts and provides apotentially streamlined pathway for transitioning TROPICS data from research to operations postlaunch.
Keywords:

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Data Assimilation Ensembles Remote Sensing Tropical Cyclones
Source:

Monthly Weather Review, 149(7), 2279-2298
DOI:

https://doi.org/10.1175/MWR-D-20-0339.1
Document Type:

Journal Article
Funding:

Grant no. NA20OAR4320472 ; Grant no. NA67RJ0149

Grant no. NA20OAR4320472 ; Grant no. NA67RJ0149 Less -
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urn:sha256:37577972622a9407e57b766914241f2ec467d34f9e615a8d050b3080ded0ca9f
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https://repository.library.noaa.gov/view/noaa/30752/noaa_30752_DS1.pdf
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Impact of TROPICS Radiances on Tropical Cyclone Prediction in an OSSE

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