Premium
Interdecadal variability in tropical cyclone frequency over the South China Sea and its association with the Indian Ocean sea surface temperature
Author(s) -
Wang Lei,
Huang Ronghui,
Wu Renguang
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/grl.50171
Subject(s) - climatology , tropical cyclone , sea surface temperature , indian ocean , anticyclone , oceanography , environmental science , walker circulation , geology
During the period 1958–2001, the frequency of tropical cyclone (TC) genesis over the South China Sea (SCS) experienced an obvious interdecadal change around the mid‐1970s. Compared to the period from late 1950s to early 1970s, the number of TCs is significantly reduced during mid‐1970s through late 1990s. This interdecadal change in the TC frequency appears to relate to the increase in sea surface temperature (SST) of the tropical Indian Ocean. The difference of the circulation between the warm phase and the cold phase of the tropical Indian Ocean SST provides support for the influence of the tropical Indian Ocean warming on the variability of the TC frequency over the SCS. In the warm phase, lower‐level convergent and ascending flows over the tropical Indian Ocean are accompanied by upper‐level divergent flows, part of which go toward the SCS, leading to upper‐level convergence and descent there. Consequently, two lower‐level anticyclones develop and the TC genesis is suppressed over the SCS.