## Latest news - **[23.04.2025]** [[SLOCS#^output-Mol2025|New paper]] on the mechanisms driving surface solar irradiance variability by [[The team#^team-Wouter|Wouter Mol]]. We show that nearly all patterns of variability can be described using four mechanisms (figure from paper). ![](figures/mol2025_mechanisms.png) - **[9.04.2025]** As part of the [[EWED]] project, we analysed the fire plume of the destructive Palisades fire in Los Angeles in January 2025. Our simulations capture the strong wind gusts (blue / green colors) and the highly turbulent nature of this plume. ![](figures/palisades_fire.mp4) - **[5.12.2024]** In the [[EWED]] project meeting we have been discussion the formation of pyrocumulus clouds, leading to escalating fires during the 2024 Varnavas fires in Greece. The [[MicroHH]] simulation below shows the formation of such clouds under strong wind conditions. ![](figures/movie_fire_deep.mp4) - **[14.10.2024]** After seven years of work, we released [[MicroHH]] version 2.0. The latest version can be downloaded from [github.com/microhh/microhh](https://github.com/microhh/microhh). - **[04.10.2024]** Last week [[The team#^team-Wouter|Wouter Mol]] defended his thesis *[Sunlight variations under broken clouds](https://edepot.wur.nl/660879)* successfully. ![[wouter_phd.jpg]] - **[24.09.2024]** [[SLOCS#^output-Tijhuis2024|New paper]] on the impact of 3D radiation of cloud evolution by [[The team#^team-mirjam|Mirjam Tijhuis]]. In short: big impact on cloud properties, very little on global surface irradiance. - **[12.08.2024]** New visualization of boundary-layer evolution visualized from surface-released heat. <div style="padding:56.25% 0 0 0;position:relative;"><iframe src="https://player.vimeo.com/video/999067936?h=39f4893bbd&autoplay=1&loop=1&title=0&byline=0&portrait=0" style="position:absolute;top:0;left:0;width:100%;height:100%;" frameborder="0" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe></div><script src="https://player.vimeo.com/api/player.js"></script> - **[29.05.2024]** New visualization of 3D simulation of pyrocumulus formation. See [[EWED]]. - **[09.04.2024]** [[SLOCS]] and [[nextGEMS]] presentations at the EGU General Assembly 2024: - Tuesday 16 April, 11.55: [Surface irradiance variability over land in storm-resolving models](https://meetingorganizer.copernicus.org/EGU24/EGU24-19072.html) by [[The team#^team-Menno|Menno Veerman]]. - Thursday 18 April, 8.30: [The Shedding Light On Cloud Shadows project: measuring and simulating surface solar irradiance under broken clouds](https://meetingorganizer.copernicus.org/EGU24/EGU24-18173.html) by [[The team#^team-Chiel|Chiel van Heerwaarden]]. - Thursday 18 April, 8.40: [Coupled 3D radiation deepens cumulus clouds without changing the mean surface solar irradiance](https://meetingorganizer.copernicus.org/EGU24/EGU24-5996.html) by [[The team#^team-mirjam|Mirjam Tijhuis]]. - **[02.04.2024]** [[SLOCS#^output-Mol2024|New publication]] by [[The team#^team-Wouter|Wouter Mol]] on the analysis of observations of cloud-driven solar irradiance variability from field campaigns. ## About With my [[The team|research group]] I study boundary-layer meteorology and atmospheric convection and the role of radiation and land-atmosphere interactions. - **Research**: Read about our [[Projects overview|projects]] and [[Publications|publications]]. - **Software**: Read about our 3D simulation code [[MicroHH]]. - **Teaching**: Read about [[Introduction|boundary-layer meteorology]]. <div style="padding:56.25% 0 0 0;position:relative;"><iframe src="https://player.vimeo.com/video/764263410?h=beddab2fc1&autoplay=1&loop=1&title=0&byline=0&portrait=0" style="position:absolute;top:0;left:0;width:100%;height:100%;" frameborder="0" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe></div><script src="https://player.vimeo.com/api/player.js"></script> <div align="center"><i>Simulation of clouds throughout the years. Visualization made for the "Building bridges in cloudy atmospheres" symposium held in October 2022 at Wageningen University.</i></div> <div class="copyright"> Copyright (c) 2024 Chiel van Heerwaarden. All rights reserved. <a href="https://www.flaticon.com/free-icons/cloud" title="cloud icons">Cloud icons created by Freepik - Flaticon</a></div>