Science, asked by meerarustagi, 5 months ago

write the cause of law rainfall lamba saa batana likhne me maja aata hai​

Answers

Answered by HimanshuSomvanshi
26

The proximate or immediate cause of a rainfall shortage may be due to one or more factors including an absence of available moisture in the atmosphere; large scale subsidence (downward movement of air within the atmosphere) which suppresses convective activity; and the absence or non-arrival of rain-bearing systems...❤️

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Answered by Goldenjungkookie
8

Answer:

Causes of reduced rainfall

When discussing the causes of drought it is helpful to distinguish between short drought episodes lasting 1-3 years and long dry regimes of predominantly subnormal rainfall spanning about a decade or more and, which may, include several intense drought episodes.

The proximate or immediate cause of a rainfall shortage may be due to one or more factors including an absence of available moisture in the atmosphere; large scale subsidence (downward movement of air within the atmosphere) which suppresses convective activity; and the absence or non-arrival of rain-bearing systems. Changes in such factors involve changes in weather systems on many spatial scales ranging from local to regional to global. While it may be possible to indicate the immediate cause of a meteorological drought occurring in any particular location, it is often not possible to indicate the underlying cause.

Short term episodes can often be linked to global-scale fluctuations in the atmosphere and oceans elsewhere in the world. For example, the El Niouthern Oscillation (ENSO) phenomenon, which involves the periodic invasion of warm surface water into the normally colder waters off the Pacific coast of South America, affects the levels of rainfall in many different parts of the world, including south-eastern Africa. However, knowledge about causes of the invasion of the warmer currents is presently incomplete.

On a larger scale, the link between sea surface temperatures and rainfall has been suggested as a possible cause of long dry regimes. Thus it has been suggested that the fact that the southern Atlantic has been consistently warmer than the northern Atlantic since around 1970 is related to the predominantly dry period in the Sahel since the mid-1960s.

Increasing levels of carbon dioxide and other “greenhouse” gasses have been suggested as causes of rainfall changes in the Sahel and elsewhere. However, as with all the postulated causes there is insufficient understanding of the physical processes involved to state with certainty that the postulations are correct.

Many causes of long dry “regimes” have been postulated. Among the local level causes are human-induced changes resulting from vegetation loss due to overgrazing and deforestation either in the general vicinity or “upwind” of the area along the line of the prevailing, moisture carrying winds. Such changes may involve “biogeophysical” feedback mechanisms, i.e. once they start, they feed back on themselves and perpetuate the drought conditions.

However, one of the main problems with the postulations involving human induced change is that of distinguishing human induced change from natural long term fluctuations. For instance, there would seem to be a 50 year fluctuation in rainfall in the western Sahel with the predominantly dry period since the mid-1960s being part of such a cycle. However, reliable rainfall data for the Sahel and many other parts of the world are available only for the last 80-90 years, and this is too short a period to support the assertion that there is such a rainfall cycle in the area. The World Meteorological Office believes that five or six such cycles are necessary to confidently predict trends (WMO 1966). Clearly however, land use patterns which result in environmental degradation, desertification, and deforestation are inextricably linked in a causal way to drought.

Explanation:

ye lijiye......

hnji mujhe bhi likhne mai maza aata hai.... hehe

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