2006-09-13 06:59:36 · 7 answers · asked by tapanroy 1 in Science & Mathematics ➔ Geography
Monsoon (Arabic mauism, “season”), wind that changes direction with the change of seasons. The monsoon prevails mainly in the Indian Ocean. It blows from the southwest, generally from April to October, and from the opposite direction, the northeast, from October to April. The southwest, or summer, monsoon is usually accompanied by heavy rain in areas of India and the East Indies, constituting the dominant climate event of the area. The appearance of this wind pattern over geological time has been linked, through sedimentary evidence, to the uplift of the Himalayas and the Tibetan Plateau (Qing Zang Gaoyuan) as the Indian subcontinent began to collide with the Asian crustal plate about 20 million years ago. The northern land mass was high enough by about 6 million years ago to cause air rising from the southern land mass to be replaced by the monsoon, establishing this wind pattern.
Monsoons, in weaker form, also occur in other parts of the world.
2006-09-13 23:42:55 · answer #1 · answered by WA KKG 4 · 0⤊ 0⤋
One popular theory of monsoon offers the possibility that monsoons involve much rain. It's just a theory, though. But a popular one.
2006-09-16 16:34:50 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Monsoons are caused by the larger amplitude of the seasonal cycle of temperature over land as compared to the adjacent oceans. This differential warming results from the fact that heat in the ocean is mixed vertically through a "mixed layer" that may be 50 meters deep, through the action of wind and buoyancy-generated turbulence, whereas the land surface conducts heat slowly, with the seasonal signal penetrating perhaps a meter or so. Additionally, the specific heat of liquid water is significantly higher than that of most materials that make up land. Together, these factors mean that the heat capacity of the layer participating in the seasonal cycle is much larger over the oceans than over land, with the consequence that land warms faster and reaches a higher temperature than the ocean. The hot air over the land tends to rise, creating an area of low pressure. This creates a steady wind blowing toward the land, bringing the moist near-surface air over the oceans with it. Associated rainfall is caused by the moist ocean air being lifted upward by mountains, surface heating, convergence at the surface, divergence aloft, or from storm-produced outflows at the surface. However the lifting occurs, the air cools due to adiabatic expansion, which in turn produces condensation.
In winter, the land cools off quickly, but the ocean retains heat longer. The hot air over the ocean rises, creating a low pressure area and a breeze from land to ocean while a large area of high pressure is formed over the land, intensified by wintertime radiational cooling.
Monsoons are similar to sea breezes, a term usually referring to the localized, diurnal (daily) cycle of circulation near coastlines everywhere, but they are much larger in scale, stronger and seasonal.
2006-09-16 18:57:01 · answer #3 · answered by KARIZMATIC_VJ 1 · 0⤊ 0⤋
Latest theory of monsoon propounded by Koteshwarao, it speaks of the effect of indoneaia air mass over indian moonsoon.
is this for your school gepgraphy reffer to CLIMATOLOGY by D.S.LAL.
DOnt use this form to do your home work
2006-09-16 05:05:48 · answer #4 · answered by savetgfdfgh 2 · 0⤊ 0⤋
Put up umbrella or get lots wet
2006-09-13 07:02:53 · answer #5 · answered by treejamin 2 · 0⤊ 1⤋
It is looming large over your head.
2006-09-13 09:38:16 · answer #6 · answered by A 4 · 0⤊ 1⤋
pick and choose ,favored states with anti quota ideology
2006-09-13 07:59:39 · answer #7 · answered by doctor asho 5 · 0⤊ 1⤋