Roman G Harrison

Biographic Data

ID134153
NAMERoman G Harrison
GIVEN NAMESRoman G
FAMILY NAMEHarrison
SIGNATUREHARRISON R G
AFFILIATIONSUniversity of Reading
ORCID0000-0003-0693-347X
VERIFIEDYes
TOTAL WORKS24
TOTAL CITATIONS29
AUTHOR COUNT24
EDITOR COUNT0
FIRST PUBLICATION YEAR1966
LATEST PUBLICATION YEAR2022
H-INDEX2

  • Empirical evidence for multidecadal scale global atmospheric electric circuit modulation by the El Niño-Southern Oscillation

    Open AccessRoman G Harrison, Keri Nicoll et al.ARTICLEEnvironmental Research Letters2022

    The El Niño-Southern Oscillation (ENSO) modifies precipitation patterns across the planet. Charge separation in disturbed weather and thunderstorms drives the global atmospheric electric circuit (GEC), hence ENSO-induced precipitation changes are anticipated to affect the global circuit. By analysing historical atmospheric electricity data using a new data processing procedure based on the Carnegie curve, signals correlated with ENSO sea surface …

  • Consistent dust electrification from Arabian Gulf sea breezes

    Open AccessKeri Nicoll, Roman G Harrison et al.ARTICLEEnvironmental Research Letters2020

    The Arabian Gulf region experiences regular thermally driven sea breeze circulations which occur all year round, penetrating hundreds of kilometres inland. As a sea breeze front moves inland, substantial electric fields are generated by separation of charged desert dust. In the first surface electric field measurements made in the United Arab Emirates (UAE), consistent and repeatable substantial electric field changes with magnitudes up to 7 kV m…

  • Saharan dust plume charging observed over the UK

    Open AccessRoman G Harrison, Keri Nicoll et al.ARTICLEEnvironmental Research Letters2018

    A plume of Saharan dust and Iberian smoke was carried across the southern UK on 16th October 2017, entrained into an Atlantic cyclone which had originated as Hurricane Ophelia. The dust plume aloft was widely noticed as it was sufficiently dense to redden the visual appearance of the sun. Time series of backscatter from ceilometers at Reading and Chilbolton show two plumes: one carried upwards to 2.5 km, and another below 800 m into the boundary …

  • Focus on high energy particles and atmospheric processes

    Open AccessRoman G Harrison, Keri Nicoll et al.ARTICLEEnvironmental Research Letters2015

    The letters published in the 'Focus issue on high energy particles and atmospheric processes' serve to broaden the discussion about the influence of high energy particles on the atmosphere beyond their possible effects on clouds and climate. These letters link climate and meteorological processes with atmospheric electricity, atmospheric chemistry, high energy physics and aerosol science from the smallest molecular cluster ions through to liquid …

  • Atmospheric electric field measurements in urban environment and the pollutant aerosol weekly dependence

    Open AccessHugo Silva, H G Silva et al.ARTICLEEnvironmental Research Letters2014

    The weekly dependence of pollutant aerosols in the urban environment of Lisbon (Portugal) is inferred from the records of atmospheric electric field at Portela meteorological station (3847N, 908W). Measurements were made with a Bendorf electrograph. The data set exists from 1955 to 1990, but due to the contaminating effect of the radioactive fallout during 1960 and 1970s, only the period between 1980 and 1990 is considered here. Using a relative …

  • Modulation of UK lightning by heliospheric magnetic field polarity

    Open AccessM J Owens, Christopher J Scott et al.ARTICLEEnvironmental Research Letters2014

    Observational studies have reported solar magnetic modulation of terrestrial lightning on a range of time scales, from days to decades. The proposed mechanism is two-step: lightning rates vary with galactic cosmic ray (GCR) flux incident on Earth, either via changes in atmospheric conductivity and/or direct triggering of lightning. GCR flux is, in turn, primarily controlled by the heliospheric magnetic field (HMF) intensity. Consequently, global …

  • Evidence for solar wind modulation of lightning

    Open AccessChristopher J Scott, Roman G Harrison et al.ARTICLEEnvironmental Research Letters2014

    The response of lightning rates over Europe to arrival of high speed solar wind streams at Earth is investigated using a superposed epoch analysis. Fast solar wind stream arrival is determined from modulation of the solar wind Vy component, measured by the Advanced Composition Explorer spacecraft. Lightning rate changes around these event times are determined from the very low frequency arrival time difference (ATD) system of the UK Met Office. A…

  • Electrical signature in polar night cloud base variations

    Open AccessRoman G Harrison, Maarten H P AmbaumARTICLEEnvironmental Research Letters2013

    Layer clouds are globally extensive. Their lower edges are charged negatively by the fair weather atmospheric electricity current flowing vertically through them. Using polar winter surface meteorological data from Sodankylä (Finland) and Halley (Antarctica), we find that when meteorological diurnal variations are weak, an appreciable diurnal cycle, on average, persists in the cloud base heights, detected using a laser ceilometer. The diurnal clo…

  • Electron acceleration above thunderclouds

    Open AccessMartin Füllekrug, Ivana Kolmašová et al.ARTICLEEnvironmental Research Letters2013

    The acceleration of electrons results in observable electromagnetic waves which can be used for remote sensing. Here, we make use of ~4 Hz–66 MHz radio waves emitted by two consecutive intense positive lightning discharges to investigate their impact on the atmosphere above a thundercloud. It is found that the first positive lightning discharge initiates a sprite where electrons are accelerated during the exponential growth and branching of the s…

  • Inferring convective responses to El Niño with atmospheric electricity measurements at Shetland

    Open AccessRoman G Harrison, Manoj Joshi et al.ARTICLEEnvironmental Research Letters2011

    Pacific ocean temperature anomalies associated with the El Niño–Southern Oscillation (ENSO) modulate atmospheric convection and hence thunderstorm electrification. The generated current flows globally via the atmospheric electric circuit, which can be monitored anywhere on Earth. Atmospheric electricity measurements made at Shetland (in Scotland) display a mean global circuit response to ENSO that is characterized by strengthening during ‘El Niño…

  • The solar influence on the probability of relatively cold UK winters in the future

    Open AccessM Lockwood, Roman G Harrison et al.ARTICLEEnvironmental Research Letters2011

    Recent research has suggested that relatively cold UK winters are more common when solar activity is low (Lockwood et al 2010 Environ. Res. Lett. 5 024001). Solar activity during the current sunspot minimum has fallen to levels unknown since the start of the 20th century (Lockwood 2010 Proc. R. Soc. A 466 303–29) and records of past solar variations inferred from cosmogenic isotopes (Abreu et al 2008 Geophys. Res. Lett. 35 L20109) and geomagnetic…

  • Solar Influences on Climate

    Open AccessLesley J Gray, Jeremy Beer et al.ARTICLEReviews of Geophysics2010

    Understanding the influence of solar variability on the Earth's climate requires knowledge of solar variability, solar-terrestrial interactions, and the mechanisms determining the response of the Earth's climate system. We provide a summary of our current understanding in each of these three areas. Observations and mechanisms for the Sun's variability are described, including solar irradiance variations on both decadal and centennial time scales …

  • Self-charging of the Eyjafjallajökull volcanic ash plume

    Open AccessRoman G Harrison, K A Nicoll et al.ARTICLEEnvironmental Research Letters2010

    Volcanic plumes generate lightning from the electrification of plume particles. Volcanic plume charging at over 1200 km from its source was observed from in situ balloon sampling of the April 2010 Eyjafjallajökull plume over Scotland. Whilst upper and lower edge charging of a horizontal plume is expected from fair weather atmospheric electricity, the plume over Scotland showed sustained positive charge well beneath the upper plume edge. At these …

  • Are cold winters in Europe associated with low solar activity

    Open AccessM Lockwood, Roman G Harrison et al.ARTICLEEnvironmental Research Letters2010

    Are cold winters in Europe associated with low solar activity? This article has been downloaded from IOPscience. Please scroll down to see the full text article

  • Top-down solar modulation of climate: Evidence for centennial-scale change

    Open AccessM Lockwood, C Bell et al.ARTICLEEnvironmental Research Letters2010

    During the descent into the recent ‘exceptionally’ low solar minimum, observations have revealed a larger change in solar UV emissions than seen at the same phase of previous solar cycles. This is particularly true at wavelengths responsible for stratospheric ozone production and heating. This implies that ‘top-down’ solar modulation could be a larger factor in long-term tropospheric change than previously believed, many climate models allowing o…

  • Observations of Saharan dust layer electrification

    Open AccessK A Nicoll, Keri Nicoll et al.ARTICLEEnvironmental Research Letters2010

    Electrification of atmospheric dust influences the coagulation, wet removal and fall speeds of dust particles. Alignment of dust particles can also occur in fair weather atmospheric electrical conditions if the particles are charged. However, very few electrical measurements made in elevated dust layers exist. Balloon-borne charge and particle instrumentation have been used to investigate the electrical properties of elevated Saharan dust layers.…

  • Observed atmospheric electricity effect on clouds

    Open AccessRoman G Harrison, Maarten H P AmbaumARTICLEEnvironmental Research Letters2009

    The atmosphere's fair weather electric field is a permanent feature, arising from the combination of distant thunderstorms, Earth's conducting surface, a charged ionosphere and cosmic ray ionization. Despite its ubiquity, no fair weather electricity effect on clouds has been hitherto demonstrated. Here we report surface measurements of radiation emitted and scattered by extensive thin continental cloud, which, after ~2 min delay, shows changes cl…

  • Program and Conference Schedule

    Open AccessJoseph W Kemnitz, Local Host et al.ARTICLEAmerican Journal of Primatology2004

  • Paleodiet studies using stable carbon isotopes from bone apatite and collagen: Examples from Southern Ontario and San Nicolas Island, California

    Open AccessRoman G Harrison, M Anne KatzenbergARTICLEJournal of Anthropological…2003

  • What's in a bone? Recent advances in archaeological bone chemistry

    Open AccessM Anne Katzenberg, Roman G HarrisonARTICLEJournal of Archaeological Research1997Cited by: 23References: 90

  • Serological evidence for the parentage of Tut'ankhamūn and Smenkhkarē'

    Open AccessR C Connolly, Roman G Harrison et al.ARTICLEThe Journal of Egyptian Archaeology1976

  • Serological Evidence for the Parentage of Tut'ankhamun and Smenkhkare'

    R C Connolly, Roman G Harrison et al.ARTICLEThe Journal of Egyptian Archaeology1976

  • Building a TEA Laser: The Caprices of Communication

    Open AccessHarold Maurice Collins, Roman G HarrisonARTICLESocial Studies of Science1975Cited by: 6

  • An Anatomical Examination of the Pharaonic Remains Purported to Be Akhenaten

    Roman G HarrisonARTICLEThe Journal of Egyptian Archaeology1966