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CAIPEEX - Indian cloud seeding scientific experiment

Urheber*innen

Prabhakaran,  Thara
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Prabhakaran, T. (2023): CAIPEEX - Indian cloud seeding scientific experiment, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1850


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017741
Zusammenfassung
Authors: CAIPEEX Team <br><br>The demands for more effective methods to increase precipitation over arid regions of India have been increasing over the past several decades. A scientific investigation of weather modification was conducted over the Indian rain shadow region of the Western Ghats (WG) Mountains to understand the efficacy of cloud seeding better and to develop a protocol. The study region, on average, receives ten times less rainfall than the windward side of the WG. The WMO peer-reviewed report (WMO, 2018) suggests a physical, statistical, and numerical investigation before operational seeding. <p>The fourth phase of the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) was conducted in 2018 and 2019 with two instrumented aircraft, a ground-based dual-polarized C-band radar, a rain gauge network, radiosondes, and surface aerosol measurements. Among the significant results are tracking the seeding material by measuring hydrometeor residual with mass spectrometry, documentation of the chain of microphysical processes modified by seeding and complemented with the background aerosol, and seeding flare particle composition. The randomized experiment resulted in 276 cases with hygroscopic seeding. The seeded clouds lasted longer, grew deeper, and produced more rainfall. Over 5000 cloud passes were analyzed, providing consistent details about the convective cloud properties as the key indicators for a seeding strategy. The experiment suggests that cloud seeding can be effective when approached scientifically.