A5084816044- Meteorological Phenomena and Simulations
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Cryospheric studies and observations
- Wind and Air Flow Studies
- Ionosphere and magnetosphere dynamics
- Fluid Dynamics and Turbulent Flows
- Oil Spill Detection and Mitigation
- Plant Ecology and Soil Science
- Atmospheric chemistry and aerosols
- Oil, Gas, and Environmental Issues
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Tropical and Extratropical Cyclones Research
- Plant Water Relations and Carbon Dynamics
- Acoustic Wave Phenomena Research
- Climate change and permafrost
- Oceanographic and Atmospheric Processes
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Advanced Thermodynamics and Statistical Mechanics
- Offshore Engineering and Technologies
- Coastal and Marine Dynamics
- Ocean Waves and Remote Sensing
University of Leeds
2011-2024
National Centre for Atmospheric Science
2012-2024
University of Trento
2020
Météo-France
2020
Universität Innsbruck
2020
Universitat de les Illes Balears
2020
Federal Office of Meteorology and Climatology MeteoSwiss
2020
University of Virginia
2020
Met Office
1982-1999
University of Reading
1992-1999
Abstract Within the framework of international field campaign COPS (Convective and Orographically‐induced Precipitation Study), a large suite state‐of‐the‐art meteorological instrumentation was operated, partially combined for first time. This includes networks in situ remote‐sensing systems such as Global Positioning System well synergy multi‐wavelength passive active instruments advanced radar lidar systems. The phase performed from 01 June to 31 August 2007 low‐mountain area southwestern...
The Autonomous Modular Scanner, onboard the Ikhana remotely operated aircraft, captured fires over Basin Fire Complex in Monterey County, California, on 8 July 2008.The image has been overlaid onto terrain data within Google Earth to provide additional information fire managers effects of behavior.The yellow areas depict active areas, with reds and purples showing burned-over areas.
The Terrain-Induced Rotor Experiment (T-REX) is a coordinated international project, composed of an observational field campaign and research program, focused on the investigation atmospheric rotors closely related phenomena in complex terrain. T-REX took place during March April 2006 lee southern Sierra Nevada eastern California. Atmospheric have been traditionally defined as quasi-two-dimensional vortices that form parallel to downwind mountain ridge under conditions conducive generation...
Precipitating convection in a mountain region of moderate topography is investigated, with particular emphasis on its initiation response to boundary-layer and mid-and upper-tropospheric forcing mechanisms.The data used the study are from COPS (Convective Orographically-induced Precipitation Study) that took place southwestern Germany eastern France summer 2007.It found precipitating can be roughly classified as being due either: (i) surface heating low-level flow convergence; (ii) moisture...
Abstract An overview of advances in the observation, modelling, forecasting, and understanding flows through gaps achieved Mesoscale Alpine Programme is given. Gaps are lateral constrictions topography (level gaps) often combined with vertical terrain changes (passes). Of possible flow configurations, only an asymmetric one (relatively deep slow upstream, accelerating thinning downstream), which connects two different ‘reservoirs’ on each side gap, examined. The strongly nonlinear, making...
The global drive to produce low-carbon energy has resulted in an unprecedented deployment of onshore wind turbines, representing a significant land use change for generation with uncertain consequences local climatic conditions and the regulation ecosystem processes. Here, we present high-resolution data from farm collected during operational idle periods that shows affected several measures ground-level climate. Specifically, discovered turbines raised air temperature by 0.18 °C absolute...
Abstract In this essay, we highlight some challenges the atmospheric community is facing concerning adequate treatment of flows over mountains and their implications for numerical weather prediction (NWP), climate simulations, impact modeling. With recent increases in computing power (and hence model resolution) models start to face new limitations (such as instability steep terrain). At same time there a growing need sufficiently reliable NWP output drive various (for hydrology, air...
Abstract The present study investigates the initiation of precipitating deep convection in an ensemble convection‐resolving mesoscale models. Results eight different model runs from five non‐hydrostatic models are compared for a case Convective and Orographically‐induced Precipitation Study (COPS). An isolated convective cell initiated east Black Forest crest southwest Germany, although available potential energy was only moderate inhibition high. Measurements revealed that, due to absence...
Abstract The ‘Convective and Orographically‐induced Precipitation Study’ (COPS) analyses the processes driving deep convection over complex terrain. Convection initiation (CI) is mainly not only expressed by a single process, but variety of them, which interact on different scales in time space finally can lead to convection. A study such case inhomogeneous terrain presented this article. Data from COPS network stations are taken identify location CI. In many cases same as first convective...
Abstract. Gas flaring is a substantial global source of carbon emissions to atmosphere and targeted as route mitigating the oil gas sector footprint due waste resources involved. However, quantifying from resource-intensive, no studies have yet assessed for offshore regions. In this work, we present dioxide (CO2), methane (CH4), ethane (C2H6), NOx (nitrogen oxide) data 58 emission plumes identified flaring, measured during aircraft campaigns over North Sea (UK Norway) in 2018 2019. Median...
Redistribution of snow by the wind can drive spatial and temporal variations in accumulation that may affect reconstruction paleoclimate records from ice cores. In this paper we investigate how along a 13 km transect across Lyddan Ice Rise, Antarctica, are related to wind‐borne redistribution. Rise is an approximately two‐dimensional ridge which rises about 130 m above surrounding shelves. Local slopes on its flanks never exceed 0.04. Despite very smooth profile, there pronounced gradient...
Abstract Doppler‐On‐Wheels radar observations made during the Convective and Orographically‐induced Precipitation Study (COPS) on 12 August 2007 showed that precipitating clouds only developed between north–south orientated Murg Nagold Valleys of northern Black Forest. The produced moderate precipitation. Weather Research Forecasting (WRF) model run at 700 m horizontal resolution in inner domain was able to simulate location Insight is therefore gained into physical mechanisms responsible...
Stably stratified flows past three-dimensional orography have been investigated using a towing tank. Flows idealized axisymmetric in which the Froude number, F h = U / Nh (where is speed, N buoyancy frequency and height of obstacle) less than unity studied. The considered consists two sizes hemisphere cones different slope. For all obstacles measurements show that as decreases, drag coefficient increases, reaching between 2.8 5.4 times value neutral flow (depending on obstacle shape) for...
Abstract. An uncontrolled gas leak from 25 March to 16 May 2012 led evacuation of the Total Elgin wellhead and neighbouring drilling production platforms in UK North Sea. Initially atmospheric flow rate leaking condensate was very poorly known, hampering environmental assessment well control efforts. Six flights by FAAM chemically instrumented BAe-146 research aircraft were used quantify rate. The calculated assuming plume may be modelled a Gaussian distribution with two different solution...
Abstract. The North Sea is Europe's key oil and gas (O&G) basin with the output currently meeting 3 %–4 % of global supply. Despite this, there are few observational constraints on nature atmospheric emissions from this region, most information derived bottom-up inventory estimates. This study reports airborne measurements volatile organic compounds (VOCs) emitted O&G-producing regions in Sea. VOC source emission signatures for primary extraction products offshore fields...
Abstract Paltridge has recently hypothesized that the mean global climate operates near a state of maximum entropy production. In this paper an attempt is made to justify hypothesis by parametrizing eddy heat fluxes in terms diffusivities and using local potential method Glansdorff Prigogine. With independent temperature its gradient principle minimum production fact found. However, more realistic parametrization, quantity closely related found be maximized. The relevance models discussed.
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...
Abstract Volcanoes are a key natural source of CO 2 , but global estimates volcanic flux predominantly based on measurements from fraction world's actively degassing volcanoes. We combine high‐precision airborne 2016 and 2017 with atmospheric dispersion modeling to quantify emissions Katla, major subglacial caldera in Iceland that last erupted 100 years ago has been undergoing significant unrest recent decades. Katla's sustained flux, 12–24 kt/d, is up an order magnitude greater than...
Advances in computing are enabling atmospheric models to operate at increasingly fine resolution, giving rise more variations the underlying orography being captured by model grid. Consequently, high-resolution must overcome problems associated with traditional terrain-following approaches of spurious winds and instabilities generated vicinity steep complex terrain. Cut-cell representations present an alternative vertical coordinates. This work explores capabilities a cut-cell representation...