Changes

==Origin==

==Origin==

Apparently in its [[origin]] a [[slang]] term, probably a derivative of ''dold'' adj., or of ''dol'' , dull   

Apparently in its [[origin]] a [[slang]] term, probably a derivative of ''dold'' adj., or of ''dol'' , dull   

*[http://en.wikipedia.org/wiki/19th_century 1811]

*[https://en.wikipedia.org/wiki/19th_century 1811]

==Definitions==

==Definitions==

*1: a spell of listlessness or despondency

*1: a spell of listlessness or despondency

The Intertropical Convergence Zone (ITCZ), known by sailors as The '''Doldrums''', is the area encircling the [[earth]] near the [[equator]] where [[winds]] originating in the northern and southern hemispheres come [[together]].

The Intertropical Convergence Zone (ITCZ), known by sailors as The '''Doldrums''', is the area encircling the [[earth]] near the [[equator]] where [[winds]] originating in the northern and southern hemispheres come [[together]].

The ITCZ was originally identified from the 1920s to the 1940s as the "Intertropical Front" (ITF), but after the [[recognition]] in the 1940s and 1950s of the significance of [http://en.wikipedia.org/wiki/Convergence_zone wind field convergence] in tropical [[weather]] production, the term "ITCZ" was then applied. When it lies near the [[equator]], it is called the [http://en.wikipedia.org/wiki/Near-equatorial_trough near-equatorial trough]. Where the ITCZ is drawn into and merges with a [http://en.wikipedia.org/wiki/Monsoon monsoonal circulation], it is sometimes referred to as a [http://en.wikipedia.org/wiki/Monsoon_trough monsoon trough], a usage more common in Australia and parts of Asia. In the seamen's [[speech]] the zone is referred as the ''doldrums'' because of its erratic [[weather]] patterns with stagnant calms and [[violent]] thunderstorms.[http://en.wikipedia.org/wiki/Doldrums]

The ITCZ was originally identified from the 1920s to the 1940s as the "Intertropical Front" (ITF), but after the [[recognition]] in the 1940s and 1950s of the significance of [https://en.wikipedia.org/wiki/Convergence_zone wind field convergence] in tropical [[weather]] production, the term "ITCZ" was then applied. When it lies near the [[equator]], it is called the [https://en.wikipedia.org/wiki/Near-equatorial_trough near-equatorial trough]. Where the ITCZ is drawn into and merges with a [https://en.wikipedia.org/wiki/Monsoon monsoonal circulation], it is sometimes referred to as a [https://en.wikipedia.org/wiki/Monsoon_trough monsoon trough], a usage more common in Australia and parts of Asia. In the seamen's [[speech]] the zone is referred as the ''doldrums'' because of its erratic [[weather]] patterns with stagnant calms and [[violent]] thunderstorms.[https://en.wikipedia.org/wiki/Doldrums]

[[Category: Earth Science]]

[[Category: Earth Science]]