Validation of the Lightning Mapping Imager on FY-4A with the Lightning Imaging Sensor on ISS
Abstract
The Lightning Mapping Imager (LMI) aboard FY-4A was launched on December 11 2016, one month after the launch of the GOES-16. The LMI was the first space borne lightning observation sensor developed by China. Here, we collect one year's observation of LMI events and validate its performance with the Lightning Imaging Sensor (LIS) on International Space Sensor (ISS). First, LMI events that occurred within one minute before or after ISS flash times are picked from raw L1 dataset, then the radiance of LMI events are investigated. To compare two different observations for the same lightning flash event, if a ISS group is matched with one or more LMI events under certain temporal (1s, 5s, 10s etc.) and spatial thresholds (0.2 degree and 0.5 degree), the ISS group is defined as matched ISS group, or it is regarded as missed ISS group. The ratio of matched ISS group number and total ISS group number is defined as detection ratio (DR). Meanwhile, because the LMI observes the Northern (Southern) hemisphere during April to September (October to March) in the specific region, the DR is discussed in the two regions separately. After the collocation, factors like group area, diurnal cycle, and group radiance are discussed to understand the variation of the detection ratio. Group area, diurnal cycle, and group radiance do not have obvious impacts on DR in present results. However, lower DR values are found on Tibetan Plateau. The relationship between lightning detection performance and the cloud properties from other sensors are further examined. The validation between observations from LMI and ISS-LIS could advance our understanding of the lightning observation from geo-stationary satellite and also contribute to the development of the next-generation of lightning sensor.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMAE13B2718L
- Keywords:
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- 3304 Atmospheric electricity;
- ATMOSPHERIC PROCESSESDE: 3314 Convective processes;
- ATMOSPHERIC PROCESSESDE: 3324 Lightning;
- ATMOSPHERIC PROCESSESDE: 3329 Mesoscale meteorology;
- ATMOSPHERIC PROCESSES