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


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..

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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.