GCAP 2.0: a global 3-D chemical-transport model framework for past, present, and future climate scenarios

Murray, Lee T.; Leibensperger, E. M.; Orbe, Clara; Mickley, Loretta J.; Sulprizio, Melissa P.

doi:10.5194/gmd-14-5789-2021

Cited by 22 publications

(18 citation statements)

References 179 publications

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“…Atmospheric chemistry simulations for online Δ 36 calculations were performed using GEOS-Chem (version 12.9.0; http://www.geos-chem.org), a three-dimensional global chemical transport model with the unified chemical mechanism (UCX; Eastham et al, 2014) driven by the meteorology of the Goddard Institute of Space Science E2.1 (GISS-E2.1) model archived at 2° latitude by 2.5° longitude spatial and 3 hr (3-D) or hourly (2-D) temporal resolution, which contains 40 vertical layers extending from the surface to about 60 km (about 28 in the tropical troposphere) (Kelley et al, 2020;Murray et al, 2014Murray et al, , 2021Rind et al, 1988;Schmidt et al, 2006). The simulations reported here degrade the GISS-E2.1 spatial resolution to 4° × 5° (latitude × longitude) for computational expediency.…”

Section: Atmospheric Chemistry Modelingmentioning

confidence: 99%

“…Here, we report new clumped-isotope measurements of O 2 trapped in polar ice cores and argue that they constrain the upper-tropospheric temperature change between the LGM and the late preindustrial Holocene (PI) and present day (PD). We use the Ice Age Chemistry and Proxies (ICECAP) modeling framework (Murray et al, 2014(Murray et al, , 2021 to estimate tropospheric O 3 changes and infer climate-driven changes in atmospheric temperature structure.…”

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confidence: 99%

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Clumped‐Isotope Constraint on Upper‐Tropospheric Cooling During the Last Glacial Maximum

et al. 2022

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Atmospheric lapse rates affect the emission of longwave radiation to space and thus the climate system's response to changes in greenhouse gas concentrations (Bony et al., 2006;Soden & Held, 2006). Accurately predicting how they and other atmospheric properties change when subject to different climate forcing, however, remains a challenge (Bony et al., 2006(Bony et al., , 2015Shepherd, 2014;Sherwood et al., 2014). Simulated lapse-rate responses to climate forcing differ substantially among models and they are, on average, a factor of two smaller than what proxy-based reconstructions imply for the most recent glacial period in the tropics (

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Section: Atmospheric Chemistry Modelingmentioning

confidence: 99%

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confidence: 99%

Clumped‐Isotope Constraint on Upper‐Tropospheric Cooling During the Last Glacial Maximum

et al. 2022

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“…We simulated tropospheric Δ 36 values under different climate and emission scenarios using GEOS‐Chem (version 12.9.0; http://www.geos-chem.org), an atmospheric chemistry‐transport model with comprehensive halogen chemistry, in a configuration as described by Murray et al. (2021). The unified chemical mechanism [UCX (Eastham et al., 2014)] was used to simulate atomic oxygen chemistry explicitly.…”

Section: Methodsmentioning

confidence: 99%

Tropospheric Ozone During the Last Interglacial

Yan

Banerjee

Murray

et al. 2022

Geophysical Research Letters

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Human activities have modified the atmosphere's composition since the Industrial Revolution in the 18th century, if not earlier (Ruddiman et al., 2020). While anthropogenic impacts on carbon dioxide and other long-lived greenhouse gases are well constrained (Rubino et al., 2019), much less is known about the human influence on atmospheric oxidation chemistry, and in particular, on tropospheric ozone (O 3 ).The most important photochemical cycle in the tropospheric O 3 budget involves nitrogen oxides (NO x = NO + NO 2 ) and volatile organic compounds (VOCs; here including methane and ethane). Photolysis of NO 2 produces atomic oxygen, which can react with molecular O 2 to form O 3 . This O 3 can also oxidize NO to form NO 2 and O 2 :(1)In low-NO x environments, this null photochemical cycle explains basic trends in ozone mixing ratios (Jacob, 1999). At steady state, the O 3 mixing ratio determined by this set of reactions, [O 3_ss ], can be expressed as:Here, J NO2 is the photodissociation rate of NO 2 , and k NO+O3 is the rate coefficient for Equation 3. Equation 4reveals that steady-state O 3 mixing ratios scale with the [NO 2 ]/[NO] ratio. The atmospheric oxidation of VOCs and carbon monoxide (CO) can increase the [NO 2 ]/[NO] ratio in low-NO x environments, elevating O 3 mixing ratios in both urban and remote atmospheres. The increasing use of fossil fuels over the late 20th century has led to the increases in the emission of NO x , VOCs, and CO into the atmosphere (Faïn et al., 2022;Rubino et al., 2019) and ultimately an increase in the observed tropospheric O 3 burden (Archibald et al., 2020).

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“…Extending from 1980 to around one month earlier than the present date, MERRA-2 is the first long term global reanalysis data that assimilates observational records of aerosol and its impact on other physical processes. MERRA-2 is widely used as meteorological fields for the GEOS-Chem chemical transport model (Hu et al, 2017;Lu et al, 2021;Murray et al, 2021).…”

Section: Merra-2mentioning

confidence: 99%

Estimates of spatially complete, observational data-driven planetary boundary layer height over the contiguous United States

Ayazpour

Shen

et al. 2022

Preprint

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Abstract. This study aims to generate a spatially complete planetary boundary layer height (PBLH) product over the contiguous US (CONUS) with minimal biases from observational data sets. An eXtreme Gradient Boosting (XGB) regression model was developed using selected meteorological and geographical data fields as explanatory variables to fit the PBLH values that are derived from Aircraft Meteorological DAta Reporting (AMDAR) hourly profiles at 13:00–14:00 local solar time (LST) during 2005–2019. The PBLH prediction by this work as well as PBLHs from three reanalysis datasets (ERA5, MERRA-2, and NARR) were evaluated by independent PBLH observations from spaceborne lidar (CALIPSO), airborne lidar (High Spectral Resolution Lidar, HSRL), and in-situ aircraft profiles from the DISCOVER-AQ campaigns. Compared with PBLH products from reanalyses, the model prediction from this work shows in general closer agreement with the reference observations. The reanalysis datasets show significant high biases in the west CONUS relative to the reference observations. One direct application of this dataset is that it enables sampling PBLH at the sounding locations and times of sensors aboard satellites with overpass time in the early afternoon, e.g., the A-train, Suomi-NPP, JPSS, and Sentinel 5-Precursor satellite sensors. Since both AMDAR and ERA5 are continuous at hourly resolution, future work is expected to extend the observational data-driven PBLHs to other daytime hours for the TEMPO mission.

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GCAP 2.0: a global 3-D chemical-transport model framework for past, present, and future climate scenarios

Cited by 22 publications

References 179 publications

Clumped‐Isotope Constraint on Upper‐Tropospheric Cooling During the Last Glacial Maximum

Clumped‐Isotope Constraint on Upper‐Tropospheric Cooling During the Last Glacial Maximum

Tropospheric Ozone During the Last Interglacial

Estimates of spatially complete, observational data-driven planetary boundary layer height over the contiguous United States

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