Abstract
The interannual variability of spring lightning activity over South China (SC) and its driving mechanism are examined using the Tropical Rainfall Measuring Mission (TRMM) satellite-estimated convective rain rate and merged lightning flash rate datasets together with atmospheric and oceanic reanalysis products over the TRMM period (1998–2014). SC is climatologically characterized by high lightning flash densities, strong convective rainfall, and large convective available potential energy (CAPE) during spring. The spring SC lightning activity (SCLA) has a strong year-to-year variability, and the standard deviation of flash rates shows a spatially coherent annular distribution centered over the Pearl River Delta. The interannual variations of spring SCLA are not only highly correlated with those of convective rainfall and CAPE, but also significantly correlated with El Niño–Southern Oscillation (ENSO). The anomalously frequent SCLA tends to follow El Niño events, while infrequent SCLA preferentially follows La Niña events. Composite analyses demonstrate that during spring for the more frequent SCLA cases, the upper tropospheric atmospheric response to El Niño-related sea surface temperature anomaly (SSTA) patterns leads to strong southwesterlies over SC in conjunction with tropical westerlies over the tropical Indian Ocean, forming a divergent environment over SC. The upper-level divergence is coupled with low-level moisture convergence, generating strong mid-tropospheric updrafts to lift more air parcels to reach their level of free convection, thereby producing stronger convection with frequent SCLA. In contrast, the anomalous circulation forced by La Niña-related SSTA patterns is conducive to suppressed convection over SC and infrequent SCLA.
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Acknowledgements
Lightning flash rate data are from the NASA Global Hydrology Resource Center (GHRC) website (https://ghrc.nsstc.nasa.gov/hydro/?q=LRMTS). TRMM-estimated convective rainfall along with total rainfall were derived from https://disc.gsfc.nasa.gov/datasets/TRMM_3A25_V7/summary?keywords=3A25. The atmospheric circulation variables and CAPE were obtained from the ERA-Interim dataset (https://www.ecmwf.int/en/forecasts/datasets/browse-reanalysis-datasets). The Extended Reconstructed SST (ERSST) data are available at https://www1.ncdc.noaa.gov/pub/data/cmb/ersst/v5/netcdf/, with the Niño 3.4 index calculated from the ERSST dataset from the NOAA website (https://origin.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/ONI_v5.php). This research was jointly supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB40000000), the SOA Program on Global Change and Air–Sea Interactions (Grant No. GASI-IPOVAI-03), and the Natural Science Foundation of China (Grant Nos. 41876020 and 41730963).
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Mao, J., Li, M. Interannual variations in spring lightning activity and convective rainfall over South China during the TRMM era. Theor Appl Climatol 142, 483–495 (2020). https://doi.org/10.1007/s00704-020-03322-0
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DOI: https://doi.org/10.1007/s00704-020-03322-0