John Robinson
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View article: TROPOMI/WFMD v2.0: Improved retrievals of XCH <sub>4</sub> and XCO with XGBoost-based quality filtering
TROPOMI/WFMD v2.0: Improved retrievals of XCH <sub>4</sub> and XCO with XGBoost-based quality filtering Open
The TROPOspheric Monitoring Instrument (TROPOMI) on board the Sentinel-5 Precursor satellite provides daily global observations of atmospheric methane (CH4) and carbon monoxide (CO) at relatively high spatial resolution. The dense spatial …
View article: Ultrastable lasers: investigations of crystalline mirrors and closed cycle cooling at 124 K
Ultrastable lasers: investigations of crystalline mirrors and closed cycle cooling at 124 K Open
We have investigated crystalline AlGaAs/GaAs optical coatings with three ultra-stable cavities operating at 4 K, 16 K, 124 K and 297 K. The response of the resonance frequencies of cavities to variations in optical power indicates effects …
View article: Comment on egusphere-2023-2534
Comment on egusphere-2023-2534 Open
Abstract. This study presents an updated and homogenised ozone time series covering 34 years (1987–2020) of ozonesonde measurements at Lauder, New Zealand, and derived vertically resolved ozone trends. Over the period of 1…
View article: Comment on egusphere-2023-2534
Comment on egusphere-2023-2534 Open
Abstract. This study presents an updated and homogenised ozone time series covering 34 years (1987–2020) of ozonesonde measurements at Lauder, New Zealand, and derived vertically resolved ozone trends. Over the period of 1…
View article: Comment on egusphere-2023-2668 by Owen Cooper
Comment on egusphere-2023-2668 by Owen Cooper Open
Abstract. Long-term ground-based ozone measurements are crucial to study the recovery of stratospheric ozone as well as the trends of tropospheric ozone. This study is performed in the context of the LOTUS (Long-term Ozone…
View article: Analysis of a newly homogenised ozonesonde dataset from Lauder, New Zealand
Analysis of a newly homogenised ozonesonde dataset from Lauder, New Zealand Open
This study presents an updated and homogenised ozone time series covering 34 years (1987–2020) of ozonesonde measurements at Lauder, New Zealand, and derived vertically resolved ozone trends. Over the period of 1987–1999, the ozone trends …
View article: Intercomparison of long-term ground-based measurements of tropospheric and stratospheric ozone at Lauder, New Zealand (45S)
Intercomparison of long-term ground-based measurements of tropospheric and stratospheric ozone at Lauder, New Zealand (45S) Open
Long-term ground-based ozone measurements are crucial to study the recovery of stratospheric ozone as well as the trends of tropospheric ozone. This study is performed in the context of the LOTUS (Long-term Ozone Trends and Uncertainties i…
View article: Pathways to interoperable electronic patient records for health and social care: Part 1: for those involved directly in care
Pathways to interoperable electronic patient records for health and social care: Part 1: for those involved directly in care Open
View article: Excess Noise and Photoinduced Effects in Highly Reflective Crystalline Mirror Coatings
Excess Noise and Photoinduced Effects in Highly Reflective Crystalline Mirror Coatings Open
Thermodynamically induced length fluctuations of high-reflectivity mirror coatings put a fundamental limit on sensitivity and stability of precision optical interferometers like gravitational-wave detectors and ultrastable lasers. The main…
View article: Evidence of a dual African and Australian biomass burning influence on the vertical distribution of aerosol and carbon monoxide over the Southwest Indian Ocean basin in early 2020
Evidence of a dual African and Australian biomass burning influence on the vertical distribution of aerosol and carbon monoxide over the Southwest Indian Ocean basin in early 2020 Open
The pristine atmosphere of the southwest Indian Ocean (SWIO) basin underwent significant perturbations during the 2020 austral summer. This study documents the complex variability of aerosols and carbon monoxide (CO) over this remote ocean…
View article: Opportunistic observations of Mount Erebus volcanic plume HCl, HF and SO2 by high resolution solar occultation mid infra-red spectroscopy
Opportunistic observations of Mount Erebus volcanic plume HCl, HF and SO2 by high resolution solar occultation mid infra-red spectroscopy Open
Opportunistic large bandwidth, high resolution, high signal to noise ratio mid-infrared solar occultation spectral measurements of the Mount Erebus (Ross Island, Antarctica) volcanic plume have been analysed to retrieve HCl, HF and SO2 plu…
View article: Frequency stability of cryogenic silicon cavities with semiconductor crystalline coatings
Frequency stability of cryogenic silicon cavities with semiconductor crystalline coatings Open
State-of-the-art optical oscillators employing cryogenic reference cavities are limited in performance by the Brownian thermal noise associated with the mechanical dissipation of the mirror coatings. Recently, crystalline Al 1− x Ga x As/G…
View article: Direct comparison of two spin squeezed optical clocks below the quantum projection noise limit
Direct comparison of two spin squeezed optical clocks below the quantum projection noise limit Open
Building scalable quantum systems that demonstrate genuine performance enhancement based on entanglement is a major scientific goal for fields including computing, networking, simulations, and metrology. The tremendous challenge arises fro…
View article: Excess noise and photo-induced effects in highly reflective crystalline mirror coatings
Excess noise and photo-induced effects in highly reflective crystalline mirror coatings Open
Thermodynamically induced length fluctuations of high-reflectivity mirror coatings put a fundamental limit on sensitivity and stability of precision optical interferometers like gravitational wave detectors and ultra-stable lasers. The mai…
View article: Unexpected Repartitioning of Stratospheric Inorganic Chlorine After the 2020 Australian Wildfires
Unexpected Repartitioning of Stratospheric Inorganic Chlorine After the 2020 Australian Wildfires Open
The inorganic chlorine (Cl y ) and odd nitrogen (NO y ) chemical families influence stratospheric O 3 . In January 2020 Australian wildfires injected record‐breaking amounts of smoke into the southern stratosphere. Within 1–2 months ground…
View article: Global Atmospheric OCS Trend Analysis From 22 NDACC Stations
Global Atmospheric OCS Trend Analysis From 22 NDACC Stations Open
Carbonyl sulfide (OCS) is a non‐hygroscopic trace species in the free troposphere and a large sulfur reservoir maintained by both direct oceanic, geologic, biogenic, and anthropogenic emissions and the oxidation of other sulfur‐containing …
View article: Determination and analysis of time series of CFC-11 (CCl<sub>3</sub>F) from FTIR solar spectra, <i>in situ</i> observations, and model data in the past 20 years above Jungfraujoch (46°N), Lauder (45°S), and Cape Grim (40°S) stations
Determination and analysis of time series of CFC-11 (CCl<sub>3</sub>F) from FTIR solar spectra, <i>in situ</i> observations, and model data in the past 20 years above Jungfraujoch (46°N), Lauder (45°S), and Cape Grim (40°S) stations Open
Analysis of the last 20 years ground-based FTIR time series of CFC-11 from NDACC stations in the northern and southern hemispheres confirm the slowdown in the CFC-11 atmospheric concentration decay, related to emissions from non-reported p…
View article: Global Atmospheric OCS Trend Analysis from 22 NDACC Stations
Global Atmospheric OCS Trend Analysis from 22 NDACC Stations Open
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Atmospheres. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be preli…
View article: Validation of methane and carbon monoxide from Sentinel-5 Precursor using TCCON and NDACC-IRWG stations
Validation of methane and carbon monoxide from Sentinel-5 Precursor using TCCON and NDACC-IRWG stations Open
The Sentinel-5 Precursor (S5P) mission with the TROPOspheric Monitoring Instrument (TROPOMI) on board has been measuring solar radiation backscattered by the Earth's atmosphere and surface since its launch on 13 October 2017. In this paper…
View article: Resolving the gravitational redshift within a millimeter atomic sample
Resolving the gravitational redshift within a millimeter atomic sample Open
Einstein's theory of general relativity states that clocks at different gravitational potentials tick at different rates - an effect known as the gravitational redshift. As fundamental probes of space and time, atomic clocks have long serv…
View article: Transport and Variability of Tropospheric Ozone over Oceania and Southern Pacific during the 2019–20 Australian Bushfires
Transport and Variability of Tropospheric Ozone over Oceania and Southern Pacific during the 2019–20 Australian Bushfires Open
The present study contributes to the scientific effort for a better understanding of the potential of the Australian biomass burning events to influence tropospheric trace gas abundances at the regional scale. In order to exclude the influ…
View article: Comment on amt-2021-36
Comment on amt-2021-36 Open
Abstract. The Sentinel-5 Precursor (S5P) mission with the TROPOspheric Monitoring Instrument (TROPOMI) on board has been measuring solar radiation backscattered by the Earth's atmosphere and surface since its launch on 13 …
View article: Validation of Methane and Carbon Monoxide from Sentinel-5 Precursor using TCCON and NDACC-IRWG stations
Validation of Methane and Carbon Monoxide from Sentinel-5 Precursor using TCCON and NDACC-IRWG stations Open
The Sentinel-5 Precursor (S5P) mission with the TROPOspheric Monitoring Instrument (TROPOMI) onboard has been measuring solar radiation backscattered by the Earth's atmosphere and its surface since its launch on 13 October 2017. Methane (C…
View article: Intercomparison of Total Carbon Column Observing Network (TCCON) data from two Fourier transform spectrometers at Lauder, New Zealand
Intercomparison of Total Carbon Column Observing Network (TCCON) data from two Fourier transform spectrometers at Lauder, New Zealand Open
We describe the change in operational instrument for the routine measurement of column-averaged dry-air mole fraction of several greenhouse gases (denoted Xgas) at the Lauder Total Carbon Column Observing Network (TCCON) site and the steps…
View article: Characterization and potential for reducing optical resonances in Fourier transform infrared spectrometers of the Network for the Detection of Atmospheric Composition Change (NDACC)
Characterization and potential for reducing optical resonances in Fourier transform infrared spectrometers of the Network for the Detection of Atmospheric Composition Change (NDACC) Open
Although optical components in Fourier transform infrared (FTIR) spectrometers are preferably wedged, in practice, infrared spectra typically suffer from the effects of optical resonances (“channeling”) affecting the retrieval of weakly ab…
View article: Evolution of observed ozone, trace gases, and meteorological variables over Arrival Heights, Antarctica &#x00028;77.8&#x000B0;S, 166.7&#x000B0;E&#x00029; during the 2019 Antarctic stratospheric sudden warming
Evolution of observed ozone, trace gases, and meteorological variables over Arrival Heights, Antarctica (77.8°S, 166.7°E) during the 2019 Antarctic stratospheric sudden warming Open
We use ground-based spectroscopic remote sensing measurements of the stratospheric trace gases O3, HCl, ClO, BrO, HNO3, NO2, OClO, ClONO2, N2O and HF, along with radiosonde profiles of temperature to track the springtime development of the…
View article: Precision Metrology Meets Cosmology: Improved Constraints on Ultralight Dark Matter from Atom-Cavity Frequency Comparisons
Precision Metrology Meets Cosmology: Improved Constraints on Ultralight Dark Matter from Atom-Cavity Frequency Comparisons Open
We conduct frequency comparisons between a state-of-the-art strontium optical lattice clock, a cryogenic crystalline silicon cavity, and a hydrogen maser to set new bounds on the coupling of ultralight dark matter to standard model particl…
View article: Solar tracker with optical feedback and continuous rotation
Solar tracker with optical feedback and continuous rotation Open
Solar trackers are often used by spectrometers to measure atmospheric trace gas concentrations using direct sun spectroscopy. The ideal solar tracker should be sufficiently accurate, highly reliable, and with a longevity that exceeds the l…
View article: Intercomparison of TCCON data from two Fourier transform spectrometers at Lauder, New Zealand
Intercomparison of TCCON data from two Fourier transform spectrometers at Lauder, New Zealand Open
We describe the change of operational instrument for the routine measurement of column-averaged dry-air mole fraction of several greenhouse gases (denoted Xgas) at the Lauder Total Carbon Column Observing Network (TCCON) site and the steps…
View article: Optical atomic clock comparison through turbulent air
Optical atomic clock comparison through turbulent air Open
We use frequency comb-based optical two-way time-frequency transfer (O-TWTFT) to measure the optical frequency ratio of state-of-the-art ytterbium and strontium optical atomic clocks separated by a 1.5 km open-air link. Our free-space meas…