EGU25-7132, updated on 14 Mar 2025
https://doi.org/10.5194/egusphere-egu25-7132
EGU General Assembly 2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Interaction between cloud-radiative effects and convective systems measured during the ORCESTRA field campaign in Aug-Sep 2024
Wei-Ting Hsiao1, Allison Wing1, Sarah Kennison1, Michael Bell2, and James Ruppert3
Wei-Ting Hsiao et al.
  • 1Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida, United States of America
  • 2Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, United States of America
  • 3School of Meteorology, University of Oklahoma, Norman, Oklahoma, United States of America

As convective aggregation has been found to be supported by radiative heating in idealized simulations, this study seeks to answer whether such a property of convection exists in the observed convective organization. Data was collected during the ORCESTRA field campaign over the tropical Atlantic in August and September 2024. Cloud properties, precipitation, atmospheric radiative fluxes, and the derived degree of convective organization are measured by the Sea-Pol radar and other instruments on a shipborne platform (RV Meteor) supported by sub-campaigns including PICCOLO and BOW-TIE. We analyze how atmospheric radiative effects support the spatial organization of tropical deep convection, and also inversely, how the convective organization affects the strength of convective-radiative feedback. In particular, the strength of convective-radiative feedback is assessed by the temporal covariance between atmospheric radiative heatings and either moist static energy tendency or precipitation rate. We will show the observed dependency of convective-radiative feedback on the occurrence of various convective organization phenomena, including mesoscale convective organization and the passage of tropical waves. The effect of radiative heating and its induced circulation on the state of convective organization during the field campaign will also be derived from mechanism-denial numerical simulations.

How to cite: Hsiao, W.-T., Wing, A., Kennison, S., Bell, M., and Ruppert, J.: Interaction between cloud-radiative effects and convective systems measured during the ORCESTRA field campaign in Aug-Sep 2024, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-7132, https://doi.org/10.5194/egusphere-egu25-7132, 2025.