Showing papers by "Barbara Brooks published in 2018"
TL;DR: In this article, the authors combine high-precision airborne measurements from 2016 and 2017 with atmospheric dispersion modeling to quantify CO2 emissions from Katla, a major subglacial volcanic caldera in Iceland that last erupted 100 years ago but has been undergoing significant unrest in recent decades.
Abstract: Volcanoes are a key natural source of CO2, but global estimates of volcanic CO2 flux are predominantly based on measurements from a fraction of world's actively degassing volcanoes We combine high‐precision airborne measurements from 2016 and 2017 with atmospheric dispersion modeling to quantify CO2 emissions from Katla, a major subglacial volcanic caldera in Iceland that last erupted 100 years ago but has been undergoing significant unrest in recent decades Katla's sustained CO2 flux, 12–24 kt/d, is up to an order of magnitude greater than previous estimates of total CO2 release from Iceland's natural sources Katla is one of the largest volcanic sources of CO2 on the planet, contributing up to 4% of global emissions from nonerupting volcanoes Further measurements on subglacial volcanoes worldwide are urgently required to establish if Katla is exceptional, or if there is a significant previously unrecognized contribution to global CO2 emissions from natural sources We combine high‐precision airborne measurements from 2016 and 2017 with atmospheric dispersion modelling to quantify CO2 emissions from Katla, a major subglacial volcanic caldera in Iceland that last erupted 100 years ago but has been undergoing significant unrest in recent decades Katla's sustained CO2 flux, 12‐24 kt/d, is up to an order of magnitude greater than previous estimates of total CO2 release from Iceland's natural sources Katla is one of the largest volcanic sources of CO2 on the planet, contributing up to 4% of global emissions from non‐erupting volcanoes Further measurements on subglacial volcanoes world‐wide are urgently required to establish if Katla is exceptional, or if there is a significant previously unrecognized contribution to global CO2 emissions from natural sources
20 citations
TL;DR: The National Centre for Atmospheric Science (NCAS) mobile X-band dual-polarization Doppler weather radar (NXPol) as discussed by the authors is the first radar of its kind in the UK.
Abstract: . In recent years, dual-polarisation Doppler X-band radars have become a widely
used part of the atmospheric scientist's toolkit for examining cloud dynamics
and microphysics and making quantitative precipitation estimates. This is
especially true for research questions that require mobile radars. Here we
describe the National Centre for Atmospheric Science (NCAS) mobile X-band
dual-polarisation Doppler weather radar (NXPol) and the infrastructure used
to deploy the radar and provide an overview of the technical specifications.
It is the first radar of its kind in the UK. The NXPol is a
Meteor 50DX manufactured by Selex-Gematronik (Selex ES GmbH), modified to
operate with a larger 2.4 m diameter antenna that produces a 0.98 ∘
half-power beam width and without a radome. We provide an overview of the
technical specifications of the NXPol with emphasis given to the description
of the aspects of the infrastructure developed to deploy the radar as an
autonomous observing facility in remote locations. To demonstrate the radar's
capabilities, we also present examples of its use in three recent field
campaigns and its ongoing observations at the NERC Facility for
Atmospheric Radio Research (NFARR).
11 citations