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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2016-403
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
13 Sep 2016
Review status
This discussion paper is a preprint. It has been under review for the journal Hydrology and Earth System Sciences (HESS). The revised manuscript was not accepted.
Tropical Moisture Exports, Extreme Precipitation and Floods in Northeast US
Mengqian Lu1,2 and Upmanu Lall2,3 1Department of Civil & Environmental Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong
2Columbia Water Center, Columbia University, New York, NY, USA
3Department of Earth & Environmental Engineering, Columbia University, New York, NY, USA
Abstract. A statistically and physically based framework is put forward that investigates the relationship between Tropical Moisture Exports (TME), and extreme Precipitation and floods in the Northeast United States (N.E. USA). TME correspond to the meridional transport of moist air masses, primarily born in tropical oceanic areas, to higher latitudes; contribute to the global climatology precipitation and its extremes; and are closely related to flood events, especially in the mid-latitudes. The birth process and the steering of TME have seasonal and interannual variability. In this study, we explore how the TME are related to extreme precipitation and floods in the N.E. USA with a focus on seasonal variability and the potential impact of the El Niño Southern Oscillation. Links of TME to large floods events in N.E. USA in different seasons are first identified. The major moisture sources of the TME that contribute to precipitation extremes and floods in N.E. USA are then identified, together with the seasonally and interannually varying characteristics in terms of both TME birth and entrance to the N.E. USA, and their subsequent contribution to extreme precipitation. We show that the extreme daily precipitation events are dominated by extreme TME entering the N.E. USA events in every season.

Citation: Lu, M. and Lall, U.: Tropical Moisture Exports, Extreme Precipitation and Floods in Northeast US, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2016-403, 2016.
Mengqian Lu and Upmanu Lall
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'Review', Anonymous Referee #1, 28 Sep 2016 Printer-friendly Version Supplement 
AC1: 'Response to the comments', Mengqian Lu, 18 Nov 2016 Printer-friendly Version Supplement 
 
RC2: 'review of Lu and Lall - very major revisions are required', Anonymous Referee #2, 08 Oct 2016 Printer-friendly Version 
AC2: 'Response to the comments', Mengqian Lu, 18 Nov 2016 Printer-friendly Version Supplement 
Mengqian Lu and Upmanu Lall
Mengqian Lu and Upmanu Lall

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Short summary
This paper studies the nexus of air moisture, heavy rain and floods in the Northeast USA, with key research questions of how the moisture from the tropics move to the region, how they are related to heavy rain and floods in the area for different seasons, and what are the roles of atmosphere and climate. The study demonstrates the utility of statistics to understand physical system. It provides a statistically and physically based framework that similar studies can be conducted for other areas.
This paper studies the nexus of air moisture, heavy rain and floods in the Northeast USA, with...
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