Journal article

Evidence of a diurnal cycle in precipitation over the Southern Ocean as observed at Macquarie Island

Francisco Lang, Yi Huang, Steven Siems, Michael Manton

Atmosphere | MDPI | Published : 2020

Abstract

Due to a lack of observations, relatively large discrepancies exist between precipitation products over the Southern Ocean. In this manuscript, surface hourly precipitation observations from Macquarie Island (54.62° S, 158.85° E) are analysed (1998-2016) to reveal a diurnal cycle. The precipitation rate is at a maximum during night/early morning and a minimum in the afternoon at Macquarie Island station. Seasonally, the diurnal cycle is strongest in summer and negligible over winter. Such a cycle is consistent with precipitation arising from marine boundary layer clouds, suggesting that such clouds are making a substantial contribution to total precipitation over Macquarie Island and the Sou..

View full abstract

University of Melbourne Researchers

Grants

Funding Acknowledgements

This study was supported by the National Commission for Scientific and Technological Research (CONICYT) Chile Doctoral Fellowship program. All the data used are listed in the references; we thank ECMWF for providing the ERA-Interim reanalysis data and Blair Trewin from the Australian Bureau of Meteorology for providing Macquarie Island observations.