Now change the date to July 1st, 2019. Intertropical convergence zone (ITCZ), also called equatorial convergence zone, belt of converging trade winds and rising air that encircles the Earth near the Equator.The rising air produces high cloudiness, frequent thunderstorms, and heavy rainfall; the doldrums, oceanic regions of calm surface air, occur within the zone.The ITCZ shifts north and south seasonally with the Sun. It should be pointed out that the term “Monsoon” alone refers simply to the rains produced by the shift nortwards or southwards of the ITCZ during summer of either hemisphere as in northern India, making the rains seasonal. Fig. Position of the intertropical convergence zone in January (in blue) and in July (in red). Figure 7.9 in The Atmosphere, 8th edition, Lutgens and Tarbuck, 8th edition, 2001. Furthermore, a shift in the ITCZ between the months of January to July creates an intense Sun in July. Changes in present-day precipitation rates in the NEP are paced by seasonal ITCZ migrations that induce strong salinity changes, while there is no discernable effect of ENSO on rainfall variability ( Fig. Pages 74; Ratings 100% (1) 1 out of 1 people found this document helpful. According to scientists, the ITCZ is the wettest zone on earth since it receives precipitation up to 200 days in a single year. In South America, the ITCZ lies across the Amazon in January and swings northward by about 20°. The Intertropical Convergence Zone, or ITCZ, is the region that circles the Earth, near the equator, where the trade winds of the Northern and Southern Hemispheres come together. 2 ). Hydroclimatic maps showing the location of Klang Cave and other paleoclimate sites. It seems that the annual displacement of this system is coordinated with the sun. Categories: About the Author David Urmann. Despite large SST indices in 1997 and a large ITCZ shift in that year, a strong meridional or zonal SST index does not imply large ITCZ shifts (Figures 4(a) and (b)). A) Southern shift of ITCZ in January. Contact. The ITCZ in this position is often called the Monsoon Trough [maximum rainfall]. The mean annual position of the thermal equator is near 10° N lat. 2. It will shift to the south in January and north in July. Since ecosystems are dependent mainly on weather patterns and temperature, shifts in weather affect animal and plant life directly or indirectly. You might want to switch back and forth between January and July while observing the ITCZ at several locations around the globe. Carlos Carlos. Note that in January, the ITCZ is mostly located in the Southern Hemisphere, where summer is occurring. In January, the ITCZ is... below the equator (the direct rays of the sun are just above the Tropic of Capricorn). Bands of heavy precipitation in the tropics indicate the ITCZ.C Also are shown the location of sediment cores shown as depicted in Fig. Trade Winds, Horse Latitudes, and the Doldrums . Sign up to view the full content. The intense sun and warm water of the equator heats the air in the ITCZ, raising its humidity and making it buoyant. Aided by the convergence of the trade winds, the buoyant air rises. The seasonal shift of the ITCZ has given the concept of Northern Inter-Tropical Convergence Zone (NITCZ) in summer (July – rainy season) and Southern Inter-Tropical Convergence Zone … Notice the shift in location of the ITCZ. It encircles Earth near the thermal equator, though its specific position varies seasonally.When it lies near the geographic Equator, it is called the near-equatorial trough. The data are separated into three decades (1981-1990, 1991-2000 and 2001-2010) and their monthly mean values are compared with each other and with the corresponding magnitudes over the whole period (1981-2010). Inter Tropical Convergence Zone (ITCZ) is one of the major systems in making the general circulation of atmosphere. Uploaded By SinMoi. Captions. This creates the Asiatic Low. … toll free Costa Rica travel desk! You might want to switch back and forth between January and July while observing the ITCZ at several locations around the globe. In Africa in July and August, for instance, the ITCZ is located just south of the Sahel desert at about 20 degrees north of the Equator, but the ITCZ over the Pacific and Atlantic Oceans is usually only 5 to 15 degrees North; meanwhile, over Asia, the ITCZ can go as far as 30 degrees North. MacCracken et al. In the winter months, the movement of the ITCZ develops the Asian monsoon season (Pidwirny & Jones, n.d.). The effect of the volcanic eruptions on the ITCZ and hence on TC activity lasts for at least 4 years. c) What direction does the ITCZ shift from January to July? It is also a zone of rising air, resulting in low air pressure, cloudiness, frequent thunderstorms, and heavy rainfall. Position of ITCZ in January and July. share | improve this answer | follow | edited May 17 '18 at 1:19. answered May 4 '18 at 16:41. Summary . Fig. But, the ITCZ drifts northward as the seasons change and is mostly located in the Northern Hemisphere in July (when it's summer in the Northern Hemisphere and solar heating is stronger there). When Can We Travel to Costa Rica? The Intertropical Convergence Zone (ITCZ), known by sailors as the doldrums or the calms because of its monotonous, windless weather, is the area where the northeast and southeast trade winds converge. The ITCZ shift and the associated surface temperature anomalies then cause changes to the genesis poten-tial indices and TC potential intensity. Test Prep. Eventually, the picture emerged of a global zone in which the pressure minimum, cloud and rainfall maxima, and low-level wind convergence coincided. The ITCZ can also result in the slowing of ocean currents and even stopping ocean currents. c) What direction does the ITCZ shift from January to July? By the small-angle approximation, fractional changes in ITCZ width and area are very similar. West Region: East Region: Latest Text Summary. AMD keynote announced for January 12th during CES 2021. The most important consequence of this shifting is the annual alteration of wet and dry seasons in tropical Africa. View large Download slide. Tehran, Iran has a unique geographical placement. northward, respectively. The radio bands below 2000 kHz or 150 meters cannot be used for reception because of radio noise in this area. The ITCZ shifts between January and July Lecture 16 midlatitude. The ITCZ (dotted line) over Africa in Jul–Aug and Jan (from Nicholson 2011). This was also found in Weller et al. In January the thermal equator coincides with the geographic equator; the mean air temperature here for January is approximately 26°C. A and B display the global mean precipitation in January and July, respectively, in Indo-Pacific between 1988 AD and 2004 AD. The fractional ITCZ width changes correspond to a median absolute narrowing of − 0.14°/K, which is associated primarily with a northward shift of the southern ITCZ edge (the observed ITCZ narrowing over recent decades is also due mostly to a northward shift of the southern ITCZ edge ). (2013) showed that solar irradiance reduction, when imposed in NH high latitudes to reduce the Arctic climate change, would lead to a southward shift in ITCZ during both June–July–August (JJA) and Decem-ber–January–February (DJF) seasons. 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