American Meteorological Society;Boston, MA: American Meteorological Society
摘要:
摘要： AbstractThe heavy rainfall/flood (HRF) event in central Vietnam usually occurs in October–November, the maximum rainfall season. This rainfall maximum undergoes a distinct interannual variation, opposite the interannual variation of sea surface temperature (SST) anomalies averaged over the NOAA Niño-3.4 area—ΔSST(Niño-3.4)—but coincident with the intensification (weakening) of the low-level easterlies at 15°N and westerlies at 5°N. The changes of low-level zonal winds reflect the strengthening (weakening) of the tropical cyclonic shear flow in tropical South/Southeast Asia in response to the tropical Pacific SST anomalies. Because the rainfall maximum in central Vietnam is primarily produced by the HRF cyclone, the interannual rainfall variation in this region should be attributed to the HRF cyclone activity—a new perspective of the climate change in precipitation. On average, one HRF cyclone occurs in each cold late fall. The population of the HRF cyclone may not be an important factor causing the interannual rainfall variation in central Vietnam. During the cold late fall, the rain-producing efficiency of the individual HRF cyclone is statistically almost twice those during warm and normal late falls and the most crucial factor leading to the interannual rainfall variation in central Vietnam. It is shown by further hydrological analysis that the increase (decrease) of the HRF cyclone’s rain-producing efficiency is determined by the large-scale environmental flow through the enhancement (weakening) of the regional convergence of water vapor flux. 出版者： Boston, MA: American Meteorological Society 出版日期： 2012-01-01 出處： Journal of Climate, 2012-01, Vol.25 (1), p.392-413 資源來源： EBSCOhost OmniFile Full Text Select 版權： 2012 American Meteorological Society 版權： 2015 INIST-CNRS 版權： Copyright American Meteorological Society 2012 版權： Copyright American Meteorological Society Jan 1, 2012 識別號： ISSN: 0894-8755 識別號： EISSN: 1520-0442 識別號： DOI: 10.1175/jcli-d-11-00068.1
