Identification

Title

A new pathway of tropical cycloneâ€“trough interaction as illustrated by the overâ€land reâ€intensification of Oswald (2013)

Abstract

Tropical Cyclone (TC) Oswald (2013) significantly impacted Australia with extensive rainfall and prolonged circulation over land, largely influenced by two mid‐latitude troughs. Unlike other documented studies, Oswald's interaction with the two troughs occurred in the mid‐troposphere, not the upper troposphere. Under the high vertical wind shear, the upper TC circulation was greatly weakened. However, in the middle levels between 400 and 600 hPa, high cyclonic potential vorticity (PV) air, was transported from the troughs to Oswald's mid‐layer circulation, replenishing its outer circulation. With the inner circulation, PV redistribution between the inner core and outer core was observed over the southeastern quadrant. This process enhanced mid‐to‐lower updrafts and boundary‐layer convergence, supporting the downshear reformation of mesovortices. Hence, despite sustained unfavorable strong shear and the absence of a warm ocean surface, the lower half of Oswald's circulation persisted and reorganized over land, significantly extending its impact after landfall.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.net/ark:/85065/d7tm7gkv

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2025-07-28T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

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Constraints related to access and use

Constraint set

Use constraints

<span style="font-family:Arial;font-size:10pt;font-style:normal;font-weight:normal;" data-sheets-root="1">Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.</span>

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact