MEVE 011 Solved Assignment 2021-22

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Course Code : MEVE 011

Course Title : Global Climate Change

Assignment Code : MEVE 011/TMA-01/2021-2022

Coverage : All Blocks

Note: This assignment is based on the entire course. Answer any five questions. MEVE 011 Solved Assignment 2021-22 All question carries equal marks. The marks for each question are indicated against it within brackets on the right-hand side. Please write all answers in your own words.

1. Write short notes on the following: (20 marks)

a. Structure of the atmosphere

The structure of the atmosphere is represented in a pictorial form below:

There are five layers in the structure of the atmosphere depending upon temperature. These layers are:

·        Troposphere

·        Stratosphere

·        Mesosphere

·        Thermosphere

·        Exosphere

This is an important topic in the Geography syllabus for UPSC 2021 Exam.

Troposphere

·        It is considered as the lowest layer of Earth’s atmosphere.

·        The troposphere starts at the surface of the earth and goes up to a height of 8 kms (poles) to 18 kms (equator). The main reason of higher height at the equator is due to presence of hot convection currents that push the gases upward.

·        All kinds of weather changes occurs within this layer.

·        This layer has water vapor and mature particles.

·        Temperature decreases with increasing height of atmosphere at the rate of 1 degree Celsius for every 165 m of height. This is called Normal lapse rate.

·        Tropopause, the transitional zone, separates Troposphere and Stratosphere.

Stratosphere

·        It is the second layer of the atmosphere found above the troposphere.

·        It extends up to a height of 50 km from the earth’s surface.

·        This layer is very dry as it contains little water vapour.

·        This layer provides some advantages for flight because it is above stormy weather and has steady, strong, horizontal winds.

·        The ozone layer is found in this layer.

·        The ozone layer absorbs UV rays and safeguards earth from harmful radiation.

·        Stratopause separates Stratosphere and Mesosphere.

Mesosphere

·        The Mesosphere is found above the stratosphere.

·        It is the coldest of the atmospheric layers.

·        The mesosphere starts at 50 km above the surface of Earth and goes up to 80 km.

·        The temperature drops with altitude in this layer.

·        By 80 km it reaches -100 degrees Celsius.

·        Meteors burn up in this layer.

·        The upper limit is called Mesopause which separates Mesosphere and Thermosphere.

Thermosphere

·        This layer is found above Mesopause from 80 to 400 km.

·        Radio waves that are transmitted from the earth are reflected by this layer.

·        The temperature starts increasing again with increasing height in this layer.

·        Aurora and satellites occur in this layer.

Ionosphere

·        The lower Thermosphere is called the Ionosphere.

·        The ionosphere consists of electrically charged particles known as ions.

·        This layer is defined as the layer of the atmosphere of Earth that is ionized by cosmic and solar radiation.

·        It is positioned between 80 and 400 km above the Mesopause.

Exosphere

·        It is the outermost layer of the atmosphere.

·        The zone where molecules and atoms escape into space is mentioned as the exosphere.

·        It extends from the top of the thermosphere up to 10,000 km.

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b. Radiative forcing

2. Write short notes on the following: (20 marks)

a. Anthropogenic drivers of climate change

b. “Cloud feedback” and “Lapse-rate feedback”

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3. Explain the sources of palaeoclimatic data. (20 marks)

4. Explain the direct and indirect effects of climate change on agriculture. (20 marks)

5. Explain the impacts of climate change on human health. (20 marks)

6. Write short notes on the following: (20 marks)

a. Glacier Lake Outburst floods b. Paris Agreement

7. Explain the National Action Plan on Climate change. (20 marks)

8. Write short notes on the following: (20 marks)

a. Concept of mitigation and adaptation

b. UNFCCC

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