A5042313108- Atmospheric chemistry and aerosols
- Geochemistry and Elemental Analysis
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- COVID-19 impact on air quality
- Geology and Paleoclimatology Research
- Radioactivity and Radon Measurements
- Central Venous Catheters and Hemodialysis
- Heavy metals in environment
- Methane Hydrates and Related Phenomena
- Climate Change, Adaptation, Migration
- Urban Heat Island Mitigation
- Wetland Management and Conservation
- Dialysis and Renal Disease Management
- Antibiotics Pharmacokinetics and Efficacy
- COVID-19 and healthcare impacts
- Botany and Geology in Latin America and Caribbean
- Mercury impact and mitigation studies
- Geotourism and Geoheritage Conservation
- Infection Control and Ventilation
University of Leeds
2018-2022
Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics
2020-2021
University of Oxford
2020-2021
University of Cambridge
2020
University of Toronto
2017
Abstract. There is considerable interest in using low-cost optical particle counters (OPCs) to supplement existing routine air quality networks that monitor mass concentrations. In order do this, OPC data need be comparable with reference instrumentation; however, there currently no widely agreed upon methodology accomplish this. Aerosol hygroscopicity known a key parameter consider when correcting concentrations derived from OPCs, particularly at high ambient relative humidity (RH)....
The 2014–2015 Bárðarbunga fissure eruption at Holuhraun in central Iceland was distinguished by the high emission of gases, total 9.6 Mt SO2, with almost no tephra. This work collates all ground-based measurements this extraordinary cloud made under particularly challenging conditions: remote location, optically dense SO2 column amounts, low UV intensity, frequent clouds and precipitation, an extensive hot lava field, developing ramparts, high-latitude winter conditions. Semi-continuous flux...
Residual kidney function contributes to the clearance of antibiotics excreted by kidneys, lowering antibiotic concentration, which may adversely affect treatment peritoneal dialysis-associated peritonitis. The objective our study was examine relationship between residual kidneyfunction and peritonitis outcomes.Our included 181 participants who experienced 339 episodes Gram-positive, Gram-negative, culture-negative at a single centerfrom 2003 2010. Episodes were categorized according...
Abstract Volcanoes represent one of the largest natural sources metals to Earth’s surface. Emissions these can have important impacts on biosphere as pollutants or nutrients. Here we use ground- and drone-based direct measurements compare gas particulate chemistry magmatic lava–seawater interaction (laze) plumes from 2018 eruption Kīlauea, Hawai’i. We find that plume contains abundant volatile metalloids whereas laze is further enriched in copper seawater components, like chlorine, with also...
The 2018 Lower East Rift Zone (LERZ) eruption of Kilauea volcano, Hawai'i, resulted in a significant increase gas emissions from the volcano and change dominant location emissions. This led to changes air quality downwind communities. We analyse two sets open-access data present measurements atmospheric sulfur dioxide (SO2) aerosol particulate matter smaller than 2.5 um (PM2.5) collected by Hawai'i Department Health (HDOH) National Park Service (NPS) operational monitoring networks between...
Abstract Long-lived basaltic volcanic eruptions are a globally important source of environmentally reactive, volatile metal pollutant elements such as selenium, cadmium and lead. The 2018 eruption Kīlauea, Hawai’i produced exceptionally high discharge pollutants, was an unprecedented opportunity to track them from vent deposition. Here we show, through geochemical sampling the plume that pollutants were depleted in up 100 times faster than refractory species, magnesium iron. We propose this...
Abstract. The 2021 Fagradalsfjall fissure eruption was the first of ongoing eruptions in most densely populated part Iceland (70 % population within 50 km). It monitored by an exceptionally dense reference-grade air quality network (14 stations 40 km), and time that a timeseries PM1 collected during eruption. We used these measurements to identify fine-scale dispersion patterns volcanic pollutants (SO2, PM1, PM2.5, PM10) areas. Despite its small size caused statistically-significant increase...
Gas and particulate matter (PM) emissions from Masaya volcano, Nicaragua, cause substantial regional volcanic air pollution (VAP). We evaluate the suitability of low-cost SO2 PM sensors for a continuous air-quality network. The network was deployed six months in five populated areas (4-16 km crater). failed recorded erroneous values on multiple occasions, likely due to corrosion, requiring significant maintenance commitment. were found be robust but data required correction humidity....
Abstract. There is considerable interest in using low-cost optical particle counters (OPC) to supplement existing routine air quality networks that monitor mass concentrations. In order do this, OPC data needs be cross-comparable with reference instrumentation, and as yet, there no widely agreed methodology. Aerosol hygroscopicity known a key parameter consider when correcting concentrations derived from OPC, particularly at high ambient Relative Humidity (RH). Correction factors have been...
Aerosol is a health risk to theatre staff. This laboratory study quantifies the reduction in particulate matter aerosol concentrations produced by electrocautery and drilling when using mitigation strategies such as irrigation, respirator filtration suction lab environment prepare for future work under live OR conditions.We combined one aerosol-generating procedure (monopolar cutting or coagulating diathermy high-speed diamond- steel-tipped of cadaveric porcine tissue) with multiple...
<p>The 2018 eruption on the Lower East Rift Zone of Kilauea volcano, Hawai’i released unprecedented fluxes gases (>200 kt/d SO<sub>2</sub>) and aerosol into troposphere [1,2]. The affected air quality across island lava flows reached ocean, forming a halogen-rich plume as rapidly boiled evaporated seawater.</p><p>We present at-source composition – gas size-segregated both magmatic...
<p>The 2018 eruption of Kīlauea volcano, Hawai'i, resulted in enormous gas emissions from the Lower East Rift Zone (LERZ) volcano. This led to important changes air quality downwind communities. We analyse and present measurements atmospheric sulfur dioxide (SO<sub>2</sub>) aerosol particulate matter < 2.5 µm (PM<sub>2.5</sub>) collected by Hawai'i Department Health (HDOH) National Park...
Abstract The authors have withdrawn this preprint due to author disagreement.
<p>Volcanoes are a large global source of almost every element, including ~20 environmentally reactive trace elements classified as metal pollutants (e.g. selenium, cadmium and lead). Fluxes from individual eruptions can be comparable to total anthropogenic emissions countries such China.</p><p>The 2018 Lower East Rift Zone eruption Kīlauea, Hawaii produced exceptionally high emission rates major chemical species compared other basaltic...
Abstract Volcanoes represent one of the largest natural sources metals to Earth’s surface. Emissions these pollutants and/or nutrients have important implications for biosphere. We compare gas and particulate chemistry, including metals, substantial magmatic (≥200 kt/day SO 2 ) lava-seawater interaction (laze) plumes from 2018 eruption Kīlauea, Hawai’i. The plume contains abundant volatile chalcophile (e.g. Se), whereas laze is enriched in seawater components Cl), yet Cu concentrations are...
Gas and particulate matter (PM) emissions from Masaya volcano, Nicaragua, cause substantial regional volcanic air pollution (VAP). We evaluate the suitability of low-cost SO2 PM sensors for a continuous air-quality network. The network was deployed six months in five populated areas (4–16 km crater). failed recorded erroneous values on multiple occasions, likely due to corrosion, requiring significant maintenance commitment. were found be robust but data required correction humidity....