Identification

Title

Assessing the impact of the South Indian Ocean Highâ€Pressure system using a novel index

Abstract

The South Indian Ocean High‐Pressure (SIOHP) system plays a crucial role in modulating atmospheric circulation, precipitation, and temperature patterns across the Indian Ocean basin and adjacent regions. Despite its significance, a comprehensive index for quantifying SIOHP variability, intensity, and impacts has been lacking. To address this gap, this study utilises a novel SIOHP index to systematically assess its climatic influence. Our findings reveal that the SIOHP's seasonal variability significantly impacts regional precipitation, temperature, and humidity. During austral winter (JJA), a stronger SIOHP is associated with drier and cooler conditions in southeastern Africa and Madagascar, while its weakening in summer (DJF) corresponds to increased precipitation in these regions. Additionally, a westward shift of the SIOHP enhances rainfall in southwestern Australia, mitigating drought conditions. Furthermore, the SIOHP‐driven moisture transport plays a vital role in shaping regional hydroclimate variability, influencing moisture advection and precipitation. These findings highlight the SIOHP's critical role in regional climate variability, underscoring the need for further research on its drivers and interactions with larger climate modes. This study provides a quantitative framework for improving seasonal forecasting, climate adaptation planning, and early warning systems in a changing climate.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.net/ark:/85065/d7280d2c

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

2025-07-06T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

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