Evaluating Changes in the Moisture Sources for Tropical Cyclones Precipitation in the North Atlantic That Underwent Extratropical Transition

Abstract In this study, we investigated the changes in the origin of moisture for the precipitation associated with tropical cyclones (TCs) after extratropical transition (ET) over the North Atlantic Ocean basin from 1980 to 2018. We analyzed the 24 hr before and after the occurrence of ET events. B...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Albenis Pérez‐Alarcón, Patricia Coll‐Hidalgo, José C. Fernández‐Alvarez, Ricardo M. Trigo, Raquel Nieto, Luis Gimeno
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
tropical cyclones
extratropical transition
precipitation
moisture sources
Lagrangian approach
Geophysics. Cosmic physics
QC801-809
North Atlantic
Online Access:https://doi.org/10.1029/2022GL102120
https://doaj.org/article/3ccab05cb969449e86a468c7344545c9
Description
Summary:Abstract In this study, we investigated the changes in the origin of moisture for the precipitation associated with tropical cyclones (TCs) after extratropical transition (ET) over the North Atlantic Ocean basin from 1980 to 2018. We analyzed the 24 hr before and after the occurrence of ET events. By applying a TC‐centric methodology we found that the moisture uptake (MU) occurred predominantly in the south and southwest sectors within ∼2,000 km of TC center before ET and from the southwest and west sectors after ET. In addition, the development of the cold front and the warm conveyor belt after ET induces changes in the moisture transport pattern. Overall, the secondary circulation of TCs favored the moisture flux inward for TCs precipitation, while the large‐scale baroclinic environment controlled the MU after ET.

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