COVID-19 highlights why UK-EU collaboration is so vital
Nature
Abstract:
The Equatorial Jet Speed on Tidally Locked Planets. I. Terrestrial Planets
ASTROPHYSICAL JOURNAL 901:1 (2020) ARTN 78
Neptune’s HCl upper limit from Herschel/HIFI
Icarus Elsevier 354 (2020) 114045
Abstract:
Here we search for hydrogen chloride (HCl) in Neptune’s stratosphere using observations of the 1876.22 GHz J=3–2 transition from the Heterodyne Instrument for the Far-Infrared (HIFI) on Herschel. Observations comprise a 7.2 hr disc-averaged integration, originally designed to investigate stratospheric methane. Significant HCl emission was not detected. Instead, we determine upper limits using step-type abundance profiles, defined by zero deep abundance and uniform volume mixing ratio for pressures less than a transition pressure (assumed to be 0.1 or 1 mbar). These profiles are a reasonable first-order approximation for an externally sourced species; at higher pressures HCl is expected to be removed by aerosol scavenging and reactions with ammonia. The 3 upper limits are 0.70 parts per billion (ppb) for a 0.1 mbar transition pressure and 0.076 ppb for a 1 mbar transition pressure. These upper limits are the most stringent to date and are consistent with current estimates of interplanetary dust particle flux and the hypothesis that Neptune experienced a large comet impact in the past 1000 years.Potential vorticity structure of Titan’s polar vortices from Cassini CIRS observations
Icarus Elsevier BV (2020) 114030
First detection of ozone in the mid-infrared at Mars: implications for methane detection
Astronomy & Astrophysics EDP Sciences 639 (2020) A141
Abstract:
Aims: The ExoMars Trace Gas Orbiter (TGO) was sent to Mars in March 2016 to search for trace gases diagnostic of active geological or biogenic processes.
Methods: We report the first observation of the spectral features of Martian ozone (O3) in the mid-infrared range using the Atmospheric Chemistry Suite (ACS) Mid-InfaRed (MIR) channel, a cross-dispersion spectrometer operating in solar occultation mode with the finest spectral resolution of any remote sensing mission to Mars.
Results: Observations of ozone were made at high northern latitudes (> 65◦N) prior to the onset of the 2018 global dust storm (Ls = 163–193◦). During this fast transition phase between summer and winter ozone distribution, the O3 volume mixing ratio observed is 100–200 ppbv near 20 km. These amounts are consistent with past observations made at the edge of the southern polar vortex in the ultraviolet range. The observed spectral signature of ozone at 3000–3060 cm−1 directly overlaps with the spectral range of the methane (CH4) ν3 vibration-rotation band, and it, along with a newly discovered CO2 band in the same region, may interfere with measurements of methane abundance.