AN UNDERSTANDING OF CLIMATE AND CLIMATE CHANGE Part I : Definitions

Setting the Agenda

• Objective & Purpose

• Weather & Climate

• Atmosphere

• Weather – Climate-Climate System

• Climate Change : Definition

• Discussions & Feedback

Watch this Video for a moment

. • Video

What was the Video all about ?

Basics :If this is happening frequently & repeatedly at a place for

last many decades and it’s a regular phenomenon then it is

referred as CLIMATE of the area .

If this is a non –frequent occurrence or for a short period or

it is not the regular phenomenon of the area then it is

referred as the WEATHER of the area.

Time Frame

Climate of the Day

Weather of the Day

Understanding

When we talk for a short period – WEATHER

When we are discussing for a very long period may be 20-30 -40 years or more - CLIMATE

Question: What are we talking

about ?

The Conditions of

ATMOSPHERE

Atmosphere is the envelop of Gases Surrounding the Earth

Atmosphere : Specific Characteristics

TEMP.

Humidity

Wind Velocity

Pressure

Visibility

Cloudiness

Revisiting our Definition :Weather and Climate

WEATHER :

It is the combination of all the specific

characteristics of the atmosphere in a region.

Day to day state of the atmosphere in a region and

its short term variation ( days to week )

Revisiting our Definition :Weather and Climate

CLIMATE:

It is WEATHER of a region averaged over a long

time period ( 25-30) yrs.

Revisiting our Definition :Weather and Climate

Weather Statistics

Averaged over a long time period Climate

METROLOGY

CLIMATOLOGY

We Say :• Cloudy Weather• Cold Waves• Snowy• Scorching Heat

We Say :• Desert Climate• Polar Climate• Monsoon Climate• Tropical Climate

Are these things so SimpleWeather and Climate

Weather is a day to day state of Atmosphere

That is

State of the Characteristics of the atmosphere

Now What is Climate ?

To Understand this aspect we have to first build understanding of

Climate System ?

Climate System

Components of Climate System

Climate System

Weather Climate Climate System

Climate System

When we talk about climate …

The Context is large

( 5 Components )

Area is wide.

(Region)

Studies are deep

( 30 yrs or more...)

Climate System

All Natural or Man Made activities within the Components

of Climate System of a region affects largely or partially the

Weather or Climatic conditions of the area.

Changes in components of Climate system

Climate SystemSample Factors affecting Changes in components of

Climate system

Geosphere

Volcanic Eruptions Land use Pattern Earth quake

Climate SystemSample Factors affecting Changes in components of

Climate system

Biosphere

Fossil Fuel Burning Nuclear Emission

Climate SystemSample Factors affecting Changes in components of

Climate system

Hydrosphere

Oil SpillsSewageWaste dumping

Climate SystemSample Factors affecting Changes in components of

Climate system

Cryosphere

Melting of ice caps Receding glacier

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