What is meant by atmospheric river?

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Arvind Singh Popular answer

Atmospheric river is a long, narrow, and transient corridor of strong horizontal water vapour transport that is typically associated with a low-level jet stream ahead of the cold front of an extra-tropical cyclone. The water vapor in atmospheric rivers is supplied by tropical and/or extra-tropical moisture sources. Atmospheric rivers frequently lead to heavy precipitation where they are forced upward—for example, by mountains or by ascent in the warm conveyor belt. Horizontal water vapor transport in the mid-latitudes occurs primarily in atmospheric rivers and is focused in the lower troposphere. Atmospheric rivers are the largest “rivers” of fresh water on Earth, transporting on average more than double the flow of the Amazon River. For more detail information please have a look at these useful RG links and PDF attachment.

Article Atmospheric rivers: A mini-review

Article How Do Atmospheric Rivers Form?

Article Life Cycle of Atmospheric Rivers: Identification and Climato...

Article On the relationship between atmospheric rivers, weather type...

Article Global Assessment of Atmospheric River Prediction Skill

Article Global Floods and Water Availability Driven by Atmospheric Rivers

Article The concurrence of Atmospheric Rivers and explosive cyclogen...

Article Atmospheric rivers as Lagrangian coherent structures

Article Atmospheric River Tracking Method Intercomparison Project (A...

Conference Paper The Impacts of Atmospheric Rivers on Precipitation over the ...

William F. Hansen

This explains the concept. https://en.m.wikipedia.org/wiki/Atmospheric_river

Arvind Singh

Muhammad Usman Saleem

An atmospheric river (AR) is a narrow corridor or filament of concentrated moisture in the atmosphere.

Yehya A. Salih

Atmospheric rivers are relatively long, narrow regions in the atmosphere – like rivers in the sky – that transport most of the water vapor outside of the tropics. These columns of vapor move with the weather, carrying an amount of water vapor roughly equivalent to the average flow of water at the mouth of the Mississippi River. When the atmospheric rivers make landfall, they often release this water vapor in the form of rain or snow.