A5051523890- Meteorological Phenomena and Simulations
- Climate variability and models
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Wind and Air Flow Studies
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Aeolian processes and effects
- Atmospheric Ozone and Climate
- Solar Radiation and Photovoltaics
- Planetary Science and Exploration
- Tropical and Extratropical Cyclones Research
- Hydrology and Watershed Management Studies
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Oceanographic and Atmospheric Processes
- Spacecraft and Cryogenic Technologies
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Fluid Dynamics and Turbulent Flows
- Precipitation Measurement and Analysis
- Remote Sensing and LiDAR Applications
- Fire effects on ecosystems
- Space Exploration and Technology
- Landslides and related hazards
Cooperative Institute for Research in Environmental Sciences
2021-2025
University of Colorado Boulder
2021-2025
NOAA Physical Sciences Laboratory
2021-2024
National Oceanic and Atmospheric Administration
2021-2024
Ceres
2023
Karlsruhe Institute of Technology
2013-2022
National Institute of Meteorology
2019-2020
University of Basel
2019
University of Bonn
2019
University of Utah
2012-2017
The exchange of heat, momentum, and mass in the atmosphere over mountainous terrain is controlled by synoptic-scale dynamics, thermally driven mesoscale circulations, turbulence. This article reviews key challenges relevant to understanding processes mountain boundary layer outlines possible research priorities for future. review describes limitations experimental study turbulent complex terrain, impact slope valley breezes on structure convective layer, role intermittent mixing...
This paper reviews the current understanding of moist orographic convection and its regulation by surface-exchange processes. Such tends to develop when where instability coincides with sufficient terrain-induced ascent locally overcome convective inhibition. The can be owing mechanical (airflow over or around an obstacle) and/or thermal (differential heating sloping terrain) forcing. For former, location initiation depends on dynamical flow regime. In “unblocked” flows that ascend barrier,...
Abstract The European Union (EU)-funded project Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) investigates the relationship between weather, climate, and air pollution southern Africa—an area with rapid population growth, urbanization, an increase anthropogenic aerosol emissions. over this region contains a unique mixture of natural gases, liquid droplets, particles, emitted environment which multilayer clouds frequently form. These exert large influence on local...
Abstract ScaleX is a collaborative measurement campaign, collocated with long-term environmental observatory of the German Terrestrial Environmental Observatories (TERENO) network in mountainous terrain Bavarian Prealps, Germany. The aims both TERENO and include modeling land surface–atmosphere interactions energy, water, greenhouse gases. motivated by recognition that intensive observational research over years or decades must be based on well-proven, mostly automated systems, concentrated...
Abstract. The land surface and the atmospheric boundary layer are closely intertwined with respect to exchange of water, trace gases, energy. Nonlinear feedback scale-dependent mechanisms obvious by observations theories. Modeling instead is often narrowed single compartments terrestrial system or bound traditional viewpoints definite scientific disciplines. Coupled hydrometeorological modeling systems attempt overcome these limitations achieve a better integration processes relevant for...
With the increase of spatial resolution weather forecast models to order O(1 km), need for adequate observations model validation becomes evident.Therefore, we designed and constructed ''KITcube'', a mobile observation platform convection studies processes on meso-c scale.The KITcube consists in-situ remote sensing systems which allow measuring energy balance components Earth's surface at different sites; mean atmospheric conditions by radiosondes, GPS station, microwave radiometer;...
Abstract. A ground-based field campaign was conducted in southern West Africa from mid-June to the end of July 2016 within framework Dynamics–Aerosol–Chemistry–Cloud Interactions (DACCIWA) project. It aimed provide a high-quality comprehensive data set for process studies, particular interactions between low-level clouds (LLCs) and boundary-layer conditions. In this region missing observations are still major issue. During campaign, extensive remote sensing situ measurements were at three...
Abstract. Thermodynamic profiles are often retrieved from the multi-wavelength brightness temperature observations made by microwave radiometers (MWRs) using regression methods (linear, quadratic approaches), artificial intelligence (neural networks), or physical iterative methods. Regression and neural network tuned to mean conditions derived a climatological dataset of thermodynamic collected nearby. In contrast, retrievals use radiative transfer model starting climatologically reasonable...
Abstract. During the Chequamegon Heterogeneous Ecosystem Energy-balance Study Enabled by a High-density Extensive Array of Detectors 2019 (CHEESEHEAD19) field campaign, held in summer northern Wisconsin, USA, active and passive ground-based remote sensing instruments were deployed to understand response planetary boundary layer heterogeneous land surface forcing. These include radar wind profilers, microwave radiometers, atmospheric emitted radiance interferometers, ceilometers, high...
Abstract The second Meteor Crater Experiment (METCRAX II) was conducted in October 2013 at Arizona’s Crater. experiment designed to investigate nighttime downslope windstorm−type flows that form regularly above the inner southwest sidewall of 1.2-km diameter crater as a southwesterly mesoscale katabatic flow cascades over rim. objective METCRAX II is determine causes these strong, intermittent, and turbulent inflows bring warm-air intrusions into part crater. This article provides an...
Abstract. Southern West Africa (SWA) is undergoing rapid and significant socioeconomic changes associated with a massive increase in air pollution. Still, the impact of atmospheric pollutants, particular that aerosol particles, on weather climate this region virtually unexplored. In study, regional-scale model framework COSMO-ART applied to SWA for summer monsoon process study 2–3 July 2016 assess direct indirect effect clouds dynamics. The modeling supported by observational data obtained...
In the region of Corsica located in western Mediterranean Sea, mean daily lightning activity as an indicator for deep convection late summer and autumn shows a distinct maximum mid‐afternoon secondary at night. During night, most is offshore near island's coastline. Currently there are no observational data which could be used to explain this nocturnal convection, but understanding its formation mechanism important accurately forecasting regional weather. article, we explore two possible...
Abstract An intensive observation period was conducted in September 2017 the central Namib, Namibia, as part of project Namib Fog Life Cycle Analysis (NaFoLiCA). The purpose field campaign to investigate spatial and temporal patterns coastal fog that occurs regularly during nighttime morning hours. is often linked advection a marine stratus intercepts with terrain up 100 km inland. Meteorological data, including cloud base height, deposition, liquid water path, vertical profiles wind...
Abstract. During the West African summer monsoon season, extended nocturnal stratiform low-level clouds (LLCs) frequently form in atmospheric boundary layer over southern Africa and persist long into following day affecting regional climate. A unique data set was gathered within framework of Dynamics–Aerosol–Chemistry–Cloud Interactions (DACCIWA) project, which allows, for first time, an observational analysis processes parameters crucial LLC formation. In this study, situ remote sensing...
Abstract While the exchange of mass, momentum, moisture, and energy over horizontally homogeneous, flat terrain is mostly driven by vertical turbulent mixing, thermally dynamically mesoscale flows substantially contribute to Earth–atmosphere in atmospheric boundary layer mountainous (MoBL). The interaction these processes acting on multiple scales leads a large spatial variability MoBL, whose observational detection requires comprehensive instrumentation sophisticated measurement strategy....
Abstract. We performed a high-resolution numerical simulation to study the development of extensive low-level clouds that frequently form over southern West Africa during monsoon season. This was made in preparation for field campaign 2016 within Dynamics-aerosol-chemistry-cloud interactions (DACCIWA) project and focuses on an area around city Savè Benin. Nocturnal evolve few hundred metres above ground same level as distinct jet. Several processes are found determine spatio-temporal...
Comprehensive measurements were carried out on the mountainous island of Corsica during Hydrological cycle in Mediterranean Experiment (HyMeX) field campaign 2012. Using data from an operational GPS network, radiosondes and microwave radiometers, we studied spatio‐temporal variability integrated water vapour (IWV) convection‐related parameters pre‐convective environment over island. The following spatial differences IWV evolution occurred frequently. In interior strongly increased around...
Abstract. This study presents the first detailed observational analysis of complete diurnal cycle stratiform low-level clouds (LLC) and involved atmospheric processes over southern West Africa (SWA). The data used here were collected during comprehensive DACCIWA (Dynamics-Aerosol-Chemistry-Cloud-Interactions in Africa) ground-based campaign, which aimed at monitoring LLC characteristics capturing wide range conditions related to African monsoon flow. In this study, situ remote sensing...
Abstract Studies of land‐atmosphere interactions under a clear sky and low cumulus cloud conditions are common from long‐term observatories like at the southern great plains. How well relationships responses surface radiative turbulent heat fluxes determined these investigations hold for more heterogeneous surfaces in other climate regimes, however, is uncertain. In this study, detailed observations energy budget daytime boundary layer properties analyzed using measurements Chequamegon...
Abstract The field campaign ‘Convective and Orographically‐induced Precipitation Study’ (COPS) was performed in south‐western Germany eastern France summer 2007. Within the COPS context this study focused on process chain of soil moisture, surface fluxes, conditions convective boundary layer (CBL), convection‐related parameters. results were different for valley mountain sites. Only Rhine did ratios sensible latent heat to net radiation at surface, H 0 / Q E respectively, reveal a weak...