Map showing 36-hour track forecast for Typhoon Maria and chart showing track errors for different experiments.
The left panel shows the 36-hour track forecast for Typhoon Maria at 0000 UTC on 10 July 2018. The black line is the observed track; the control experiment is shown in blue; the red, green, cyan and magenta lines experiments include data at different time intervals (15 mins, 30 mins, 1 hour, and 3 hours, respectively). The right panel shows the track errors in kilometers for the control and the four different time intervals. Credit: Yin et al. [2021], Figure 4, top panels
Editors’ Highlights are summaries of recent papers by AGU’s journal editors.
Source: Geophysical Research Letters

The Geostationary Interferometric Infrared Sounder (GIIRS) is a space-borne instrument making fast and accurate measurements of temperature and humidity, which can portray atmospheric structure in three-dimensions.  Yin et al. [2021] use data from GIIRS at 15-minute temporal resolution and, for the first time, show the impact of assimilating target high-resolution temporal observations in typhoon track forecasts. The authors show significant improvement in the track and intensity (sea level pressure) forecasts as the temporal resolution of the data assimilated is increased. They also show that the precipitation forecasts improve during landfall by assimilating the same high-resolution data. These improvements are connected with the improvement in simulation of the details of structure of the typhoon, in particular temperature, leading to better initial fields for the forecasts.

Citation: Yin, R., Han, W., Gao, Z., & Li, J. [2021]. Impact of high temporal resolution FY-4A Geostationary Interferometric Infrared Sounder (GIIRS) radiance measurements on Typhoon forecasts: Maria (2018) case with GRAPES global 4D-Var assimilation system. Geophysical Research Letters, 48, e2021GL093672.

―Suzana Camargo, Editor, Geophysical Research Letters

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