ATom: Aircraft Flight Track and Navigational Data

Wofsy, S.C.

doi:10.3334/ornldaac/1613

Cited by 5 publications

(3 citation statements)

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“…S16 ). SI Appendix , Table S5 describes the measurements used in our analysis ( 72 – 88 ), which spans ATom-1, 2, 3, and 4, corresponding to Northern Hemisphere summer (28 July to 22 August, 2016), winter (26 January to 22 February, 2017), fall (28 September to 26 October, 2017), and spring (24 April to 21 May, 2018).…”

Section: Methodsmentioning

confidence: 99%

An observation-based, reduced-form model for oxidation in the remote marine troposphere

Baublitz

Fiore

Ludwig

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The hydroxyl radical (OH) fuels atmospheric chemical cycling as the main sink for methane and a driver of the formation and loss of many air pollutants, but direct OH observations are sparse. We develop and evaluate an observation-based proxy for short-term, spatial variations in OH (Proxy OH ) in the remote marine troposphere using comprehensive measurements from the NASA Atmospheric Tomography (ATom) airborne campaign. Proxy OH is a reduced form of the OH steady-state equation representing the dominant OH production and loss pathways in the remote marine troposphere, according to box model simulations of OH constrained with ATom observations. Proxy OH comprises only eight variables that are generally observed by routine ground- or satellite-based instruments. Proxy OH scales linearly with in situ [OH] spatial variations along the ATom flight tracks (median r 2 = 0.90, interquartile range = 0.80 to 0.94 across 2-km altitude by 20° latitudinal regions). We deconstruct spatial variations in Proxy OH as a first-order approximation of the sensitivity of OH variations to individual terms. Two terms modulate within-region Proxy OH variations—water vapor (H 2 O) and, to a lesser extent, nitric oxide (NO). This implies that a limited set of observations could offer an avenue for observation-based mapping of OH spatial variations over much of the remote marine troposphere. Both H 2 O and NO are expected to change with climate, while NO also varies strongly with human activities. We also illustrate the utility of Proxy OH as a process-based approach for evaluating intermodel differences in remote marine tropospheric OH.

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Section: Methodsmentioning

confidence: 99%

An observation-based, reduced-form model for oxidation in the remote marine troposphere

Baublitz

Fiore

Ludwig

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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“…We consider three main sources of errors in the retrieval algorithm, including (a) measurement noise and spectral fitting errors during the slant column fitting, (b) errors in separating stratospheric and tropospheric BrO, and (c) systematic errors due to uncertainties in model parameters affecting the tropospheric AMF. We use error propagation (Boersma et al, 2004;De Smedt et al, 2008, 2018Theys et al, 2011) to derive the total error on the tropospheric vertical columns ( 𝐴𝐴 𝐴𝐴𝑉𝑉 tropo ) as:…”

Section: Error Budget Of the Retrieved Tropospheric Bro Columnsmentioning

confidence: 99%

“…𝐴𝐴𝑀𝑀 tropo is derived from individual input parameters (Boersma et al, 2004;De Smedt et al, 2008, 2018 as: Overall, the retrieval error on monthly averaged tropospheric BrO columns 𝐴𝐴 ( 𝜎𝜎𝑉𝑉 tropo ) is <70%. For the slant column, 𝐴𝐴 𝐴𝐴𝑆𝑆 rand is 5 × 10 13 molecules cm −2 , estimated following a statistical method (Boersma et al, 2007)…”

Section: 𝐴𝐴mentioning

confidence: 99%

Global Observations of Tropospheric Bromine Monoxide (BrO) Columns From TROPOMI

Chen,

Liu,

Zhu

et al. 2023

JGR Atmospheres

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Bromine monoxide (BrO) plays an important role in tropospheric chemistry. The state‐of‐the‐science TROPOspheric Monitoring Instrument (TROPOMI) offers the potential to monitor atmospheric composition with a fine spatial resolution of up to 5.5 × 3.5 km2. We present here the retrieval of tropospheric BrO columns from TROPOMI. We implement a stratospheric correction scheme using a climatological approach based on the latest GEOS‐Chem High Performance chemical transport model, and improve the tropospheric air mass factor calculation with TROPOMI surface albedo data accounting for the geometrical dependency. Our product presents a good level of consistency in comparison with measurements from ground‐based zenith‐sky differential optical absorption spectroscopy (r = 0.67), aircrafts (r = 0.46), and satellites (similar spatial distributions of BrO columns). Furthermore, our retrieval captures BrO enhancements in the polar springtime with values up to 7.8 × 1013 molecules cm−2 and identifies small‐scale emission sources such as volcanoes and salt marshes. Based on TROPOMI data, we probe a blowing snow aerosol bromine mechanism in which the snow salinity is reduced to better match simulation and observation. Our TROPOMI tropospheric BrO product contributes high‐resolution global information to studies investigating atmospheric bromine chemistry.

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Global-scale constraints on light-absorbing anthropogenic iron oxide aerosols

et al. 2021

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Anthropogenic iron oxide aerosols (FeOx) have been identified as a climatically significant atmospheric light absorber, and as a contributor of free iron to the oceans. Here we provide global-scale constraints on their atmospheric abundance with measurements over the remote Pacific and Atlantic Oceans from aircraft campaigns spanning 10 years. We find FeOx-like aerosols are transported far from source regions with similar efficiency as black carbon particles. Strong contrast in concentrations was observed between the Northern and Southern Hemisphere Pacific. We provide observational constraints in remote regions on the ambient ratios of FeOx relative to BC from fossil fuel burning. Comparison with a global aerosol model tuned to recent observations in East-Asian source regions confirm an upward revision of emissions based on model/observation comparison over the Pacific receptor region. We find that anthropogenic FeOx-like particles generate global-scale shortwave atmospheric heating 0.3–26% of that of black carbon in remote regions where concentrations of both aerosols are very low.

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ATom: Aircraft Flight Track and Navigational Data

Cited by 5 publications

References 0 publications

An observation-based, reduced-form model for oxidation in the remote marine troposphere

An observation-based, reduced-form model for oxidation in the remote marine troposphere

Global Observations of Tropospheric Bromine Monoxide (BrO) Columns From TROPOMI

Global-scale constraints on light-absorbing anthropogenic iron oxide aerosols

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