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Bin Guan, Duane E. Waliser, and F. Martin Ralph

1. Introduction Characterized by enhanced water vapor transport in long and narrow corridors in the lower troposphere, atmospheric rivers (ARs) play important roles in the global water cycle ( Zhu and Newell 1998 ) and deliver precious freshwater to many arid/semiarid regions ( Guan et al. 2010 ; Dettinger et al. 2011 ; Rutz and Steenburgh 2012 ), but they can also represent a significant hazard around the globe due to the associated extreme wind and precipitation (e.g., Waliser and Guan

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Allison B. Marquardt Collow, Michael G. Bosilovich, and Randal D. Koster

are a similar number of events in both groupings (~200; see Table S1 in the supplemental material). This number is representative of roughly 10% of the number of days with at least 1 mm of precipitation as opposed to the total number of days within the time period due to the threshold used in the percentile calculation. Note that such a compositing approach has been used to study events (e.g., atmospheric rivers) in other regions ( Grotjahn and Faure 2008 ; Warner et al. 2012 ; Gao et al. 2014

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