Journal article

Gravity Wave Influences On Mesoscale Divergence: An Observational Case Study

CC Stephan, TP Lane, C Jakob

Geophysical Research Letters | American Geophysical Union | Published : 2020

Abstract

Characteristics of tropospheric low-frequency gravity waves are diagnosed in radiosonde soundings from the TropicalWarm Pool-International Cloud Experiment near Darwin, Australia. The waves have typical vertical wavelengths of about 4 km, horizontal wavelengths of about 600 km, and intrinsic periods of about 12 hr. These scales match those of the vertical, horizontal, and temporal variability found in area-averaged horizontal wind divergence over the same domain. Vertical profiles of divergence show wave-like structures with variability of the order of 2 × 10−5 s−1 in the free troposphere. The results for Darwin are similar to previously reported observed mesoscale patterns of divergence/con..

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University of Melbourne Researchers

Grants

Awarded by ARC Centre of Excellence for Climate Extremes


Funding Acknowledgements

C. C. Stephan was supported by the Minerva Fast Track Programme of the Max Planck Society. T. P. Lane and C. Jakob were supported by the ARC Centre of Excellence for Climate Extremes (CE170100023). C. C. Stephan is grateful for the joint funding from the ARC Centre of Excellence for Climate Extremes (CE170100023) and the Max Planck Institute for Meteorology to enable the research visit to Australia that has led to the research reported here. The authors also acknowledge the support of the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Program for the TWP-ICE campaign. The data used in this study are available from the ARM data archive (https://www.arm.gov/data).