Modulation of western North Pacific tropical cyclone activity by the Atlantic Meridional Mode

Wei Zhang; Gabriel Vecchi; Gabriele Villarini; Hiroyuki Murakami; Anthony Rosati; Xiaosong Yang; Liwei Jia; Fanrong Zeng

doi:10.1007/s00382-016-3099-2

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Modulation of western North Pacific tropical cyclone activity by the Atlantic Meridional Mode

Journal article

Peer reviewed

Modulation of western North Pacific tropical cyclone activity by the Atlantic Meridional Mode

Wei Zhang, Gabriel Vecchi, Gabriele Villarini, Hiroyuki Murakami, Anthony Rosati, Xiaosong Yang, Liwei Jia and Fanrong Zeng

Climate dynamics, Vol.48(1), pp.631-647

01/2017

DOI: 10.1007/s00382-016-3099-2

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Abstract

This study examines the year-to-year modulation of the western North Pacific (WNP) tropical cyclones (TC) activity by the Atlantic Meridional Mode (AMM) using both observations and the Geophysical Fluid Dynamics Laboratory Forecast-oriented Low Ocean Resolution Version of CM2.5 (FLOR) global coupled model. 1. The positive (negative) AMM phase suppresses (enhances) WNP TC activity in observations. The anomalous occurrence of WNP TCs results mainly from changes in TC genesis in the southeastern part of the WNP. 2. The observed responses of WNP TC activity to the AMM are connected to the anomalous zonal vertical wind shear (ZVWS) caused by AMM-induced changes to the Walker circulation. During the positive AMM phase, the warming in the North Atlantic induces strong descending flow in the tropical eastern and central Pacific, which intensifies the Walker cell in the WNP. The intensified Walker cell is responsible for the suppressed (enhanced) TC genesis in the eastern (western) part of the WNP by strengthening (weakening) ZVWS. 3. The observed WNPTC–AMM linkage is examined by the long-term control and idealized perturbations experiment with FLOR-FA. A suite of sensitivity experiments strongly corroborate the observed WNPTC–AMM linkage and underlying physical mechanisms.

Atlantic Meridional Mode

Climatology

Earth Sciences

Geophysics/Geodesy

Oceanography

Tropical cyclone

Western North Pacific

Details

Title: Subtitle: Modulation of western North Pacific tropical cyclone activity by the Atlantic Meridional Mode
Creators: Wei Zhang - Princeton University
Gabriel Vecchi - Princeton University
Gabriele Villarini - University of Iowa
Hiroyuki Murakami - Princeton University
Anthony Rosati - National Oceanic and Atmospheric Administration
Xiaosong Yang - National Oceanic and Atmospheric Administration
Liwei Jia - Princeton University
Fanrong Zeng - National Oceanic and Atmospheric Administration
Resource Type: Journal article
Publication Details: Climate dynamics, Vol.48(1), pp.631-647
DOI: 10.1007/s00382-016-3099-2
ISSN: 0930-7575
eISSN: 1432-0894
Publisher: Springer Berlin Heidelberg
Grant note: AGS-1262091; AGS-1262099 / National Science Foundation (http://dx.doi.org/10.13039/100000001)
Language: English
Date published: 01/2017
Academic Unit: Civil and Environmental Engineering; IIHR--Hydroscience and Engineering
Record Identifier: 9984197061102771

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