High-resolution simulation of a nocturnal narrow convective line off the southeastern coast of Taiwan in the Mei-yu season

Details High-resolution simulation of a nocturnal narrow convective line off the southeastern coast of Taiwan in the Mei-yu season High-resolution simulation of a nocturnal narrow convective line off the southeastern coast of Taiwan in the Mei-yu season

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3606815w&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 6, CiteID L06815

Physics

1

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Global Change: Regional Climate Change, Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Climate Dynamics (0429, 3309), Atmospheric Processes: Radiative Processes

Scientific paper

This study performed high-resolution numerical simulation on a convective line that occurred roughly 10-30 km offshore of southeastern Taiwan overnight of 14-15 May 1998. Three experiments at successively higher resolution (10, 2, and 0.5 km) but smaller domain were carried out, and the narrow line is eventually reproduced. It is found that shallow (offshore) return flow along the coast appeared since daytime due to topographic blocking on the weak prevailing (onshore) south-southeasterly wind, producing convergence at their interface near shore. During the night, mountain breeze further strengthened the offshore flow and convergence, and the line initiated. Once developed, downdrafts and outflow boundaries from old clouds triggered new clouds, and this was more active along the (eastern) boundaries against the undisturbed environmental flow. Thus, repeated new cloud formation took place throughout the night and into the next morning.

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