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| Titel |
Charge analysis on lightning discharges to the ground in Chinese inland plateau (close to Tibet) |
| VerfasserIn |
X. Qie, Y. Yu, X. Liu, C. Guo, D. Wang, T. Watanabe, T. Ushio |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 10 ; Nr. 18, no. 10, S.1340-1348 |
| Datensatznummer |
250014083
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1340-2000.pdf |
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| Zusammenfassung |
Since the summer of 1996, scientists from
China and Japan have conducted a joint observation of natural cloud-to-ground
lightning discharges in the Zhongchuan area that is located close to
Qinghai-Xizang (Tibet) Plateau, China. It has been found that the long-duration
of intracloud discharge processes, just before the first return stroke, lasted
more than 120 ms for 85% of cloud-to-ground flashes in this area, with a mean
duration of 189.7 ms and a maximum of 300 ms. We present the results of charge
sources neutralized by four ground flashes and two intracloud discharge
processes, just before the first return stroke, by using the data from a 5-site
slow antenna network synchronized by GPS with 1 µs time resolution. The result
shows that the altitudes of the neutralized negative charge for three negative
ground flashes were between 2.7 to 5.4 km above the ground, while that of
neutralized positive charges for one positive ground flash and one continuing
current process were at about 2.0 km above the ground. The comparison with radar
echo showed that the negative discharges initiated in the region greater than 20
dBZ or near the edge of the region with intense echoes greater than 40 dBZ,
while positive discharge initiated in the weak echo region.
Key words: Meterology and atmospheric dynamics
(atmospheric electricity; convective processes; lightning)
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