WMO originated from the International Meteorological Organization (IMO), which was founded in 1873 to facilitate the exchange of weather information across national borders. Established in 1950, the WMO became a specialized agency of the United Nations in 1951.
WMO used to earlier provide information related to shipping and travel and with time it has covered all the aspects related to climate, weather and water. The due importance of WMO has increased manifold.
It shows the vital contribution of National Meteorological and Hydrological Services to the safety and well-being of society. The themes which are chosen for World Meteorological Day reflects climate, weather and water related issues.
It is WMO’s top priorities to protect lives, livelihoods, and property from the risks related to weather, climate and water events. The theme for World Meteorological Day 2019 is, The Sun, The Earth and the Weather.
The Sun is the primary source of energy for Earth’s climate system. It delivers the energy that powers all life on Earth. It drives the weather, ocean currents and hydrological cycle. Sun also helps in shaping our moods and daily activities. The amount of sunlight received on Earth’s surface is affected by the reflectivity of the surface, the angle of the Sun, the output of the Sun, and the cyclic variations of the Earth’s orbit around the Sun.
Sun has an impact on the Earth. The air surrounding us consists of different gases and some particles. The layer of air, known as the Earth’s atmosphere, is retained by the gravity. Nitrogen (78%) and oxygen (21%) are the main components. Besides containing the oxygen, human beings and other organisms also need to live. The atmosphere has several other features as well. Like, absorption of ultraviolet radiation from the Sun by the ozone layer and heat retention known as the greenhouse effect.
Image Credit: Greening The Blue
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