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Title: CAPE Threshold for Lightning Over the Tropical Ocean

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1029/2021jd035621· OSTI ID:1978548

Abstract We investigate the relationship between convective available potential energy (CAPE), precipitation, the number and size of storms and overshooting tops, and lightning stroke density ( f ) over the Central America region. While f increases almost linearly with CAPE 1/2 over land, f is nearly muted over the ocean when CAPE is small. In the high‐CAPE regime, on the contrary, oceanic storms produce as many lightning flashes as land storms. We show that individual oceanic storms are smaller and contain fewer overshooting tops compared to land storms, although the difference exists across low‐ and high‐CAPE regimes. While f increases as individual storm size increases, the storm size required to produce lightning appears to be disproportionately high in the low‐CAPE regime, likely due to the stronger entrainment effect. The entrainment effect on f in the low‐CAPE regime appears to be much weaker over land. Applying the CAPE threshold for lightning over the ocean to the CAPE‐based lightning parameterization scheme of Romps et al. (2014), https://doi.org/10.1126/science.1259100 improves its performance, in particular, at representing the land‐sea contrast in f .

Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Oceanic and Atmospheric Administration (NOAA); Korean Meteorological Administration (KMA)
Grant/Contract Number:
SC0016223; 80NSSC17K0227; NA18OAR4310276; NA18OAR4310300; KMI2021-01210; DE‐SC0016223
OSTI ID:
1978548
Alternate ID(s):
OSTI ID: 1826836
Journal Information:
Journal of Geophysical Research: Atmospheres, Vol. 126, Issue 20; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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