Characteristic Long-range Variation Of Latent Heat Release Over The Tropical Western Pacific And Tropical Atlantic

Using63years data of latent heat,10m wind speed above the sea surface andtemperature difference between oceanic and atmospheric, the characteristics of thelong-range change of latent heat transport variation in West Pacific and the Atlanticwarm pool region have been studied. The relationship between latent heat and windspeed and temperature difference were also examined. Results show that:1) the latent heat in the tropical west Pacific Ocean continued to increase in theoffshore, while reduce far from the sea since1960s, Tropical Atlantic latent heatincreased significantly in hurricane activity central area after1996compared with theprevious20years. There are important effects of strong typhoons and hurricanes onthe tropical Pacific and Atlantic latent heat.2) Latent in two seas increase in winter while reduce in summer in a similar way.Latent heat of the tropical western Pacific warm pool shows different changes indifferent stages in a year: April to June shows a decreasing trend, July to Septembershows in70-90’s latent heat to reduce while after1990latent heat has increased.November to January the following year shows an increasing trend. Latent heat in thetropical Atlantic shows in three changes in a year: January to March latent heatchange irregularly. April to September continue to reduce, October to Decembershows1971-1995to an overall reduction while after1996continue to increase. Latentheat in two seas both increase in winter, Statistics found that the high-frequency timeof strong typhoons each year gradually after the extension, reduced in July August andSeptember, increased in October and November. The number of strong typhoons inthis sea area and the latent heat increased at the same time.3) The two impacting factors on the latent heat are sea surface wind speed andsea-air temperature difference. In tropical west Pacific Ocean, the wind speed effectslatent heat obviously in the sea near Luzon. In west Atlantic, wind speed can explainthe changes of the latent heat perfectly in nearly entire sea area. The impact of air-seahumidity difference (expressed as the sea temperature difference) on latent heatreflects mainly in the warm current.