Earth's atmosphere contains how much water?

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There is a great deal of water in our atmosphere.

This planet is sometimes referred to as "the blue world" because of its abundance of freshwater. The quantity of liquid water on Earth, unlike on other planets in the solar system and beyond, has allowed countless species to form and thrive. According to the US Geological Survey, 71% of the Earth's surface is covered by water, while 96.55% of the planet's water supply is in the oceans (USGS). The water cycle (also known as the hydrologic cycle) involves water moving up and out of the Earth's crust and into the atmosphere.

How much water is in the air at any given time? How much is above our heads right now, and what would happen if it all came down at once?

A massive downpour might pose severe problems for millions of people since billions of gallons of water vapor are in the atmosphere.

Water on Earth is estimated to be 332.5 million cubic miles, according to the United States Geological Survey (USGS) (1.4 billion cubic kilometers). It would take 1.66 million Olympic-sized swimming pools to fill a cubic mile of water — enough to supply 1.66 million cubic miles of water.

Hydrologic cycles ensure that Earth's water never stays in one location for long. It changes to vapor, condenses to form clouds, and then returns to the Earth as precipitation after all these transformations. After that, the process repeats itself.

According to Britannica, evaporated water can be found in the atmosphere for up to ten days. As a result, the atmosphere is wholly saturated with water vapor.

Frédéric Fabry, the director of the J. Stewart Marshall Radar Observatory and an associate professor of the environment and the Department of Atmospheric and Oceanic Sciences at McGill University in Canada, tells Live Science that on average, there is about the equivalent of 30 mm [1.2 inches] of rain in the form of vapor available to fall over any point on Earth's surface.

According to him, approximately 55 pounds (25 kilograms) of water are dispersed over every square yard.

Fabry estimates atmospheric water volume as 37.5 million billion gallons given Earth's 197 million-square-mile surface area (510 million square kilometers). He noted that global ocean levels would rise by around 1.5 inches (3.8 cm) if all of this material fell at once.

Even if all of this vapor were to fall at once, the sea level would rise dramatically, which might have disastrous implications. According to the Climate Change Post, global sea levels would "seriously damage" low-lying cities like Mumbai, Kochi, Abidjan, and Jakarta if they increase by just 2 inches (5 cm). These cities have a combined population of more than 28 million and are already prone to coastal floods.

A 2017 study published in Scientific Reports found that if sea levels rise 2 to 4 inches (5 to 10 centimeters) during the next century, the frequency of floods will double in a wide range of places, ", especially in the tropics."

You wouldn't have an equitable distribution of rain if every drop of water in the atmosphere fell to the ground. Some places on Earth are drier than others.

There is a delicate balancing act that determines how much water in the atmosphere there is, Fabry explained. "The movement of air in the atmosphere is determined by the amount of water on the surface and the temperature. The warmth of the surface provides the energy needed to evaporate water. The largest evaporation occurs in warm waters, while the smallest amounts occur on Arctic land."

In general, the amount of water vapor in the atmosphere changes seasonally and geographically, but Fabry noted that warm air is better at transporting water than cold air. Therefore tropical oceans and wet tropical locations contain the most.

Geology and topography also play a role, as sloping terrain affects the speed at which air rises to the upper atmosphere, where it cools. As a result, Fabry said, mountainous places upwind "receive more than their share of precipitation.". According to the USGS, this helps to explain why Seattle, Washington, which is located near the Cascade Mountains, receives so much rain.

The amount of water vapor in the atmosphere is expected to decrease in the following decades due to climate change. As temperatures rise, Fabry predicts an increase in surface evaporation and, ultimately, the amount of water in the atmosphere.

As a result, the rate of global warming is on the verge of accelerating. Increasing the amount of water vapor in the atmosphere will positively impact global warming and the greenhouse effect.

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Reference : https://www.livescience.com/how-much-water-earth-atmosphere

Image source : https://pixabay.com/id/photos/awan-langit-suasana-berawan-414198/

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