Application of atmospheric low-frequency oscillation on meteorological drought forecast in Eastern part of the Northwest China

Jianying Feng; Yuanpu Liu; Zhilan Wang

doi:10.1117/12.2324833

24 October 2018 Application of atmospheric low-frequency oscillation on meteorological drought forecast in Eastern part of the Northwest China

Jianying Feng, Yuanpu Liu, Zhilan Wang

Author Affiliations +

Proceedings Volume 10776, Remote Sensing of the Atmosphere, Clouds, and Precipitation VII; 107761A (2018) https://doi.org/10.1117/12.2324833
Event: SPIE Asia-Pacific Remote Sensing, 2018, Honolulu, Hawaii, United States

Abstract

Characteristics of the atmospheric low-frequency oscillation on the drought process during the flood season (May to September) in eastern part of the northwest China are analyzed using the NCEP/NCAR reanalysis data and conventional surface precipitation data. Results show the low-frequency characteristics of the southward and eastward propagation in the middle and high latitudes, and the divergence airflow over eastern part of the northwest China during the drought. Drought event occurs during propagation of the low-frequency north wind and before convergence of the north and south airflows. The drought process mainly occurs in the negative phase of relative vorticity low-frequency oscillation and in the positive phase of the OLR low-frequency oscillation, i.e., in the period of relatively weak convection. A method based on the atmospheric Low-Frequency diagnosis was used to predict the meteorological drought event in eastern part of the northwest China. The forecast results are promising on the meteorological drought event during the flood season from 2010 to 2017.

Citation Download Citation

Jianying Feng, Yuanpu Liu, and Zhilan Wang "Application of atmospheric low-frequency oscillation on meteorological drought forecast in Eastern part of the Northwest China", Proc. SPIE 10776, Remote Sensing of the Atmosphere, Clouds, and Precipitation VII, 107761A (24 October 2018); https://doi.org/10.1117/12.2324833

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