water cycle

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water cycle

the circulation of the earth's water, in which water evaporates from the sea into the atmosphere, where it condenses and falls as rain or snow, returning to the sea by rivers or returning to the atmosphere by evapotranspiration

Water Cycle


the continuous migration of water on earth (in its atmosphere, hydrosphere, and crust), accompanied by phase transitions of the water and possessing a more or less pronounced cyclical character.

The water cycle consists of the evaporation of water from the underlying surface and its transport by air currents from the evaporation site, condensation of water vapor, precipitation, and shifting of water in bodies of water over the land surface and within the earth’s crust. Most of the water evaporates from the oceans and returns to them; less is transported by air currents from the oceans to land. The transport of moisture evaporating from land to the oceans by air currents is slight. The water cycle is characterized quantitatively by the water balance.

A small cycle—sea (ocean) → atmosphere → sea (ocean)— and a large cycle—ocean → atmosphere → land — ocean—are distinguished according to the site of the evaporation and precipitation of water and the modes of its transport. Moisture repeatedly evaporates from the continents, is transported in the atmosphere, condenses, and again falls in the form of precipitation and again evaporates. This complex of processes is called the intracontinental cycle. An internal moisture cycle is characteristic of closed intermontane basins. The water cycle on the earth is part of the total complex of processes participating in the cycle of matter on the earth. (See alsoHYDROLOGIC CYCLE.)


water cycle

[′wȯd·ər ‚sī·kəl]
References in periodicals archive ?
The earth's hydrological cycle acts like a giant water pump that continually transfers freshwater from the oceans to the land and back again.
5 billion years ago, incorporates interactions between the atmosphere, ocean, land, ice and hydrological cycles, said CU-Boulder doctoral student Eric Wolf of the atmospheric and oceanic sciences department.
It was marked by a 5-8[degrees]C warming in both low and high-latitude regions, a perturbation of the hydrological cycle and major biotic response on land and in the oceans, including radiations, extinctions and migrations (see overviews in Bowen et al.
Pittock also introduced intriguing and counter-intuitive climate possibilities: Reduced sulphate aerosol pollution, which previously helped cool the atmosphere through "global dimming," may lead to larger warming than previously projected, and an enhanced hydrological cycle, which results from more heat in the atmosphere and leads to more precipitation at high latitudes, could conceivably cause Antarctica to accumulate instead of lose ice, relatively lowering sea level instead of raising it.
of Rajasthan) and Jat (geography, Government PG College, Neem-Ka-Thana) offer both theory and practical information as they describe the scope of water resources geography, the inventory and distribution of the world's water resources, groundwater, the hydrological cycle, irrigation methods, demand and use, problems of water quality, water pollution, industrial use of water, flood management, drought and dry farming, conservation (including traditional methods), integrated basin planning, watershed management, river water disputes, remote sensing technologies, environmental disasters and water crises.
What we have seen in our latest climate simulations is that the "Asian haze" is having an effect on the Australian hydrological cycle and generated increasing rainfall and cloudiness since 1950, especially over north-west and central Australia.
We have found on Titan the equivalent of a hydrological cycle, and that's a big deal" says Wall.
The constitutional-reform proposal, drawn up by lawyer Guillermo Garcia Ducchini and reviewed by well-known legal experts, would add a clause to Article 47 of the Constitution stating: "Surface water, as well as subterranean water that is part of the hydrological cycle, except for rainwater, constitutes a one-time resource subordinated to the common interest, which forms part of the state public domain as the Hydraulic Public Domain.
Each aspect of the hydrological cycle has been dealt with.
Writes Brown: "Three of the Earth's natural limits are already slowing the growth in world food production: the sustainable yield of oceanic fisheries, the amount of fresh water produced by the hydrological cycle, and the amount of fertilizer that existing crop varieties can effectively use.
From new construction to the retrofitting of existing systems, this book presents the case for a new urban relationship to water, one with a more sustainable connection to the environment and the hydrological cycle.
We will generate quantitative paleohydrological data by developing a dual biomarker approach as a novel and direct proxy for fluxes in the hydrological cycle from 10 of the most precisely dated terrestrial climate records encompassing the European continent.

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