NDLI: Effects of tropical North Atlantic SST on tropical cyclone genesis in the western North Pacific

Content Provider	Springer Nature Link
Author	Yu, Jinhua Li, Tim Tan, Zhemin Zhu, Zhiwei
Copyright Year	2015
Abstract	The tropical cyclone genesis number (TCGN) in July–October (JASO) over the western North Pacific (WNP) exhibits a robust interannual variation. It shows a longitudinally tri-pole pattern with a high in the eastern WNP and South China Sea (SCS) and a low in the western WNP, which explain 42.2 and 23.4 % of total TCGN variance in the eastern WNP and SCS, respectively. The high–low–high pattern is similar to that derived from a TC genesis potential index (GPI). To understand the cause of the longitudinal distribution of the dominant interannual mode, we examine the contributions of environmental parameters associated with GPI. It is found that relative humidity and relative vorticity are important factors responsible for TC variability in the SCS, while vertical shear and relative vorticity are crucial in determining TC activity in eastern WNP. A simultaneous correlation analysis shows that the WNP TCGN in JASO is significantly negatively correlated (with a correlation coefficient of −0.5) with sea surface temperature anomalies (SSTA) in the tropical North Atlantic (TNA). The longitudinal distribution of TC genesis frequency regressed onto TNA SSTA resembles that regressed upon the WNP TCGN series. The spatial patterns of regressed environmental variables onto the SSTA over the TNA also resemble those onto TCGN in the WNP, that is, an increase of relative humidity in the SCS and a weakening of vertical shear in the eastern WNP are all associated with cold SSTA in the TNA. Further analyses show that the cold SSTA in the TNA induce a negative heating in situ. In response to this negative heating, a low (upper)-level anomalous aniti-cyclonic (cyclonic) flows appear over the subtropical North Atlantic and eastern North Pacific, and to east of the cold SSTA, anomalous low-level westerlies appear in the tropical Indian Ocean. Given pronounced mean westerlies in northern Indian Ocean in boreal summer, the anomalous westerly flows increase local surface wind speed and surface evaporation and cool the SST in situ. Cold SSTA in northern Indian Ocean further suppress local convection, inducing anomalous westerlies to its east, leading to enhanced cyclonic vorticity and low surface pressure over the WNP monsoon trough region. Idealized numerical experiments further confirm this Indian Ocean relaying effect, through which cold SSTA in the tropical Atlantic exert a remote impact to circulation in the WNP.
Starting Page	865
Ending Page	877
Page Count	13
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	46
Issue Number	3-4
e-ISSN	14320894
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-04-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tropical North Atlantic SST Tropical cyclone genesis in the western North Pacific Teleconnection Geophysics/Geodesy Climatology Oceanography
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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

Intensified impact of northern tropical Atlantic SST on tropical cyclogenesis frequency over the western North Pacific after the late 1980s

Atmospheric teleconnection mechanisms of extratropical North Atlantic SST influence on Sahel rainfall

Tropical cyclone genesis frequency over the western North Pacific simulated in medium-resolution coupled general circulation models

Dynamical downscaling forecasts of Western North Pacific tropical cyclone genesis and landfall

Intensified impact of tropical Atlantic SST on the western North Pacific summer climate under a weakened Atlantic thermohaline circulation

ENSO and Western North Pacific tropical cyclone activity simulated in a CGCM

Seasonal forecasting of intense tropical cyclones over the North Atlantic and the western North Pacific basins

Variations in large-scale tropical cyclone genesis factors over the western North Pacific in the PMIP3 last millennium simulations

Effects of tropical North Atlantic SST on tropical cyclone genesis in the western North Pacific

Similar Documents

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

Intensified impact of northern tropical Atlantic SST on tropical cyclogenesis frequency over the western North Pacific after the late 1980s

Atmospheric teleconnection mechanisms of extratropical North Atlantic SST influence on Sahel rainfall

Tropical cyclone genesis frequency over the western North Pacific simulated in medium-resolution coupled general circulation models

Dynamical downscaling forecasts of Western North Pacific tropical cyclone genesis and landfall

Intensified impact of tropical Atlantic SST on the western North Pacific summer climate under a weakened Atlantic thermohaline circulation

ENSO and Western North Pacific tropical cyclone activity simulated in a CGCM

Seasonal forecasting of intense tropical cyclones over the North Atlantic and the western North Pacific basins

Variations in large-scale tropical cyclone genesis factors over the western North Pacific in the PMIP3 last millennium simulations

Effects of tropical North Atlantic SST on tropical cyclone genesis in the western North Pacific