TITLE:
Analysis of More Tropical Cyclone Genesis over the Western North Pacific in 2016
AUTHORS:
Jian Li
KEYWORDS:
Western North Pacific, Sea Surface Temperature, Western Pacific Subtropical High, Environmental Factors
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.7 No.12,
December
30,
2019
ABSTRACT: Tropical cyclone (TC) is the most
catastrophic weather system characterized by strong winds and heavy rains, and
is therefore the main research object of tropical meteorology. Based on National
Oceanic and Atmospheric Administration (NOAA) Sea Surface Temperature (SST),
Outgoing Long wave Radiation (OLR) and National
Centers for Environmental Prediction (NCEP) monthly reanalysis data and Regional Specialized Meteorological Center (RSMC) Tokyo best track data and China Meteorological Administration (CMA)
tropical cyclone during 1979-2016, we analyze
the feathers of tropical cyclones and causes of more tropical cyclones (TCs) over the western north Pacific(including the South China Sea) (WNP)
in 2016. The results show that compared the
number of tropical cyclone genesis was higher, the originated time was later and concentrated in autumn, the
region of more cyclones formed in north and east, and the number of
landing TCs was higher. Negative sea surface temperature anomaly in the
equatorial eastern Pacific and a westward
deviation of the ascending branch of Walker circulation can strengthen
the intensity of convection activity based on an existing lead-lag correlation
during the period of TC activity (from August to September).The West Pacific
subtropical high (WPSH) was exceptionally
stronger than in other years and its west ridge point appreciably stretched westward
and northward from August to September in 2016, which is favorable to TC genesis. At the same time, ω positive anomaly located in northward which was favorable for
more TC genesis in WNP. In addition, the anomalous distribution of
environmental factors such as low vorticity, OLR and vertical wind shear may
also be the cause of the formation of tropical cyclones in the West North
Pacific in 2016.