DOI number:10.1002/2016JD025053
Journal:Journal of Geophysical Research: Atmospheres
Abstract:A novel dynamically based index that reflects the strength of the regional potential vorticity (PV) intrusion on the 300 K isentropic surface is proposed as a reliable measure of East Asian winter monsoon (EAWM) intensity. The index captures essential aspects of the EAWM, including its climatic influences on East Asia, its continuous weakening trend since the 1980s, and its close relationships with the Siberian high, Arctic Oscillation, and El Niño. The use of a potential vorticity framework enables the definition of a new metric called continuous PV intrusion duration (CPVID), which can be used to monitor and explain wintertime weather extremes like the extreme snowfall event that occurred in south China during January 2008. The CPVID of March is comparable to that of December, indicating that data from this month should be included in estimates of the strength of the EAWM.
Note:Huang, W., B. Wang and J. S. Wright
Indexed by:Journal paper
Discipline:Natural Science
First-Level Discipline:Atmospheric Sciences
Volume:121
Issue:16
Page Number:9382-9399
Translation or Not:no
Included Journals:SCI
Links to published journals:https://doi.org/10.1002/2016JD025053