Cross the Pacific ITCZ
From CruisersWiki
Crossing the Pacific ITCZ
|
Description
The Intertropical Convergence Zone (ITCZ), also known as the Intertropical Front, Monsoon trough, Doldrums or the Equatorial Convergence Zone, is a belt of low pressure girdling Earth at the equator. It is formed by the vertical ascent of warm, moist air from the latitudes above and below the equator.
The air is drawn into the intertropical convergence zone by the action of the Hadley cell, a macroscale atmospheric feature which is part of the Earth's heat and moisture distribution system. It is transported aloft by the convective activity of thunderstorms; regions in the intertropical convergence zone receive precipitation over 200 days in a year.
The location of the intertropical convergence zone varies over time. Over the oceans, where the convergence zone is better defined, the seasonal cycle is more subtle, as the convection is constrained by the distribution of ocean temperatures.
Sometimes, a double ITCZ forms, with one located north and another south of the equator. When this occurs, a narrow ridge of high pressure forms between the two convergence zones, one of which is usually stronger than the other.
Variation in the location of the intertropical convergence zone drastically affects rainfall in many equatorial nations, resulting in the wet and dry seasons of the tropics rather than the cold and warm seasons of higher latitudes. Longer term changes in the intertropical convergence zone can result in severe droughts or flooding in nearby areas.
In some cases, the ITCZ may become narrow, especially when it moves away from the equator; the ITCZ can then be interpreted as a front along the leading edge of the equatorial air.
Within the ITCZ the average winds are slight, unlike the zones north and south of the equator where the trade winds feed. Early sailors named this belt of calm the doldrums because of the inactivity and stagnation they found themselves in after days of no wind. To find oneself becalmed in this region in a hot and muggy climate could mean death in an era when wind was the only effective way to propel ships across the ocean.
Climate & Weather Information
Give expected climatic & weather conditions for this passage or refer to another page (a region or island group) that covers these conditions.
Sources for Weather forecasts:
Weather Windows
Give the best time/s of year for this passage and expected weather conditions.
Radio Nets
Also see World Cruiser's Nets.
Give charts applicable to this port or refer to a Chart section of another page (Country or Region) that lists the charts.
- Source
- Chart Number - Chart Name
- Chart Number - Chart Name
- Source
- Chart Number - Chart Name
Forum discussions
List links to discussion threads on partnering forums. (see link for requirements)
External Links
List links external to the wiki such as in Wikipedia.
References
- Crossing the Pacific ITCZ - A free .pdf download
Personal Notes
Personal experiences?
| This page has an outline in place but needs completing. Please contribute if you can to help it grow further. Click on Comments to suggest further content or alternatively, if you feel confident to edit this page, click on the edit tab at the top and enter your changes directly. |
|
|---|
|
Names: Lighthouse |
| |
|---|
| | HOMEPAGE | Wiki Contents | Pacific Ocean | East Pacific | Cross the Pacific ITCZ | |
