Doldrums of the 1960s in the song Holy Mountain “get out of the doldrums, baby now!” Doldrums The doldrums is a colloquial expression derived from historical maritime usage, which refers to those parts of the Atlantic Ocean and the Pacific Ocean affected by a low-pressure area around the equator where the prevailing winds are calm. The doldrums are also noted for calm periods when the winds disappear altogether, trapping sailing ships for periods of days or weeks. The term appears to have arisen in the eighteenth century, when trans-equator sailing voyages became more common. Since this zone is where two trade
Asymmetry of the Intertropical Convergence Zone northern tropicalSST slightly. Vice versa, SST of southern part to the equator is much reduced. Therefore, SST of northern tropical is much higher, and higher than southern tropical, by which increases the CESG. As a result, this positive feedback, which is defined as Wind-Evaporation-SST (WES) will intensify this process. In this way, the WES keeps the ITCZ north of the equator. And the precondition of WES is the asymmetric distribution of SST, and WES also strengthens this process. According to the observation of equatorial upwelling and obvious asymmetry of the ITCZ in the Pacific and Atlantic, it is inferred that