what is the climatic conditions in the sub continent before monsoon ? Why ? unavailable answers from website
Answers
Explanation:
I
n the last two chapters you have read about
the landforms and the drainage of
our country. These are the two of the three
basic elements that one learns about the natural
environment of any area. In this chapter you
will learn about the third, that is, the
atmospheric conditions that prevail over our
country. Why do we wear woollens in December
or why it is hot and uncomfortable in the month
of May, and why it rains in June - July? The
answers to all these questions can be found out
by studying about the climate of India.
Climate refers to the sum total of weather
conditions and variations over a large area for
a long period of time (more than thirty years).
Weather refers to the state of the atmosphere
over an area at any point of time. The elements
of weather and climate are the same, i.e.
temperature, atmospheric pressure, wind,
humidity and precipitation. You may have
observed that the weather conditions fluctuate
very often even within a day. But there is some
common pattern over a few weeks or months,
i.e. days are cool or hot, windy or calm, cloudy
or bright, and wet or dry. On the basis of the
generalised monthly atmospheric conditions,
the year is divided into seasons such as winter,
summer or rainy seasons.
The world is divided into a number of
climatic regions. Do you know what type of
climate India has and why it is so? We will
learn about it in this chapter.
• The word monsoon is
derived from the Arabic word ‘mausim’ which
literally means season.
• ‘Monsoon’ refers to the seasonal reversal in the
wind direction during a year.
CLIMATE
The climate of India is described as the
‘monsoon’ type. In Asia, this type of climate
is found mainly in the south and the southeast.
Despite an overall unity in the general pattern,
there are perceptible regional variations in
climatic conditions within the country. Let us
take two important elements – temperature and
precipitation, and examine how they vary from
place to place and season to season.
In summer, the mercury occasionally
touches 50°C in some parts of the Rajasthan
desert, whereas it may be around 20°C in
Pahalgam in Jammu and Kashmir. On a winter
night, temperature at Drass in Jammu and
Kashmir may be as low as minus 45°C.
Thiruvananthapuram, on the other hand, may
have a temperature of 22°C.
In certain places there is a
wide difference between day and night
temperatures. In the Thar Desert the day
temperature may rise to 50°C, and drop down
to near 15°C the same night. On the other hand,
there is hardly any difference in day and night
temperatures in the Andaman and Nicobar
islands or in Kerala.
Let us now look at precipitation. There are
variations not only in the form and types of
precipitation but also in its amount and the
seasonal distribution. While precipitation is
mostly in the form of snowfall in the upper parts
of Himalayas, it rains over the rest of the
country. The annual precipitation varies from
over 400 cm in Meghalaya to less than 10 cm
in Ladakh and western Rajasthan. Most parts
of the country receive rainfall from June to
September. But some parts like the Tamil Nadu