Search Results - "Schmidt, Johan A"

A new mechanism for atmospheric mercury redox chemistry: implications for the global mercury budget by Horowitz, Hannah M, Jacob, Daniel J, Zhang, Yanxu, Dibble, Theodore S, Slemr, Franz, Amos, Helen M, Schmidt, Johan A, Corbitt, Elizabeth S, Marais, Eloïse A, Sunderland, Elsie M

“…Mercury (Hg) is emitted to the atmosphere mainly as volatile elemental Hg0. Oxidation to water-soluble HgII plays a major role in Hg deposition to ecosystems…”
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Global impacts of tropospheric halogens (Cl, Br, I) on oxidants and composition in GEOS-Chem by Sherwen, Tomás, Schmidt, Johan A, Evans, Mat J, Carpenter, Lucy J, Großmann, Katja, Eastham, Sebastian D, Jacob, Daniel J, Dix, Barbara, Koenig, Theodore K, Sinreich, Roman, Ortega, Ivan, Volkamer, Rainer, Saiz-Lopez, Alfonso, Prados-Roman, Cristina, Mahajan, Anoop S, Ordóñez, Carlos

“…We present a simulation of the global present-day composition of the troposphere which includes the chemistry of halogens (Cl, Br, I). Building on previous…”
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Carbon dioxide photolysis from 150 to 210 nm: Singlet and triplet channel dynamics, UV-spectrum, and isotope effects by Schmidt, Johan A., Johnson, Matthew S., Schinke, Reinhard

“…We present a first principles study of the carbon dioxide (CO ₂) photodissociation process in the 150- to 210-nm wavelength range, with emphasis on photolysis…”
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Particulate air pollution in the Copenhagen metro part 2: Low-cost sensors and micro-environment classification by Russell, Hugo S., Kappelt, Niklas, Fessa, Dafni, Frederickson, Louise B., Bagkis, Evangelos, Apostolidis, Pantelis, Karatzas, Kostas, Schmidt, Johan A., Hertel, Ole, Johnson, Matthew S.

“…[Display omitted] •Particulate matter (PM) levels on the CPH metro are measured with low-cost sensors.•Low-costs sensors perform well, due to stable conditions…”
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Active and widespread halogen chemistry in the tropical and subtropical free troposphere by Wang, Siyuan, Schmidt, Johan A., Baidar, Sunil, Coburn, Sean, Dix, Barbara, Koenig, Theodore K., Apel, Eric, Bowdalo, Dene, Campos, Teresa L., Eloranta, Ed, Evans, Mathew J., DiGangi, Joshua P., Zondlo, Mark A., Gao, Ru-Shan, Haggerty, Julie A., Hall, Samuel R., Hornbrook, Rebecca S., Jacob, Daniel, Morley, Bruce, Pierce, Bradley, Reeves, Mike, Romashkin, Pavel, Schure, Arnout ter, Volkamer, Rainer

“…Halogens in the troposphere are increasingly recognized as playing an important role for atmospheric chemistry, and possibly climate. Bromine and iodine react…”
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Clumped isotope perturbation in tropospheric nitrous oxide from stratospheric photolysis by Schmidt, Johan A., Johnson, Matthew S.

“…Nitrous oxide (N2O) is potent greenhouse gas and source of ozone depleting NO to the stratosphere. Recent advances in mass spectrometry allow accurate…”
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Isotopic constraints on the role of hypohalous acids in sulfate aerosol formation in the remote marine boundary layer by Chen, Qianjie, Geng, Lei, Schmidt, Johan A, Xie, Zhouqing, Kang, Hui, Dachs, Jordi, Cole-Dai, Jihong, Schauer, Andrew J, Camp, Madeline G, Alexander, Becky

“…Sulfate is an important component of global atmospheric aerosol, and has partially compensated for greenhouse gas-induced warming during the industrial period…”
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SO₂ photoexcitation mechanism links mass-independent sulfur isotopic fractionation in cryospheric sulfate to climate impacting volcanism by HATTORI, Shohei, SCHMIDT, Johan A, JOHNSON, Matthew S, DANIELACHE, Sebastian O, YAMADA, Akinori, UENO, Yuichiro, YOSHIDA, Naohiro

“…Natural climate variation, such as that caused by volcanoes, is the basis for identifying anthropogenic climate change. However, knowledge of the history of…”
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Recoil Inversion in the Photodissociation of Carbonyl Sulfide near 234 nm by Sofikitis, Dimitris, Suarez, Jaime, Schmidt, Johan A, Rakitzis, T Peter, Farantos, Stavros C, Janssen, Maurice H M

“…We report the observation of recoil inversion of the CO (v=0, J_{CO}=66) state in the UV dissociation of lab-frame oriented carbonyl sulfide (OCS). This state…”
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Synthesis of 13C-depleted organic matter from CO in a reducing early Martian atmosphere by Ueno, Yuichiro, Schmidt, Johan A., Johnson, Matthew S., Zang, Xiaofeng, Gilbert, Alexis, Kurokawa, Hiroyuki, Usui, Tomohiro, Aoki, Shohei

“…Organic matter found in early Martian sediment may yield clues to the planet’s environmental conditions, prebiotic chemistry and habitability, but its origin…”
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Halogen chemistry reduces tropospheric O3 radiative forcing by Sherwen, Tomás, Evans, Mat J, Carpenter, Lucy J, Schmidt, Johan A, Mickley, Loretta J

“…Tropospheric ozone (O3) is a global warming gas, but the lack of a firm observational record since the preindustrial period means that estimates of its…”
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Halogen chemistry reduces tropospheric O 3 radiative forcing by Sherwen, Tomás, Evans, Mat J., Carpenter, Lucy J., Schmidt, Johan A., Mickley, Loretta J.

“…Tropospheric ozone (O3) is a global warming gas, but the lack of a firm observational record since the preindustrial period means that estimates of its…”
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Clumped isotope effects during OH and Cl oxidation of methane by Whitehill, Andrew R., Joelsson, Lars Magnus T., Schmidt, Johan A., Wang, David T., Johnson, Matthew S., Ono, Shuhei

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Hydrogen shift reactions in four methyl-buten-ol (MBO) peroxy radicals and their impact on the atmosphere by Knap, Hasse C., Schmidt, Johan A., Jørgensen, Solvejg

“…We investigate the hydrogen shift (H-shift) reactions in the peroxy radicals derived from four different methyl-buten-ol (MBO) molecules; 2-methyl-3-buten-2-ol…”
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On the structure of Si(100) surface: importance of higher order correlations for buckled dimer by Back, Seoin, Schmidt, Johan A, Ji, Hyunjun, Heo, Jiyoung, Shao, Yihan, Jung, Yousung

“…We revisit a dangling theoretical question of whether the surface reconstruction of the Si(100) surface would energetically favor the symmetric or buckled…”
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Global modeling of tropospheric iodine aerosol by Sherwen, Tomás M., Evans, Mat J., Spracklen, Dominick V., Carpenter, Lucy J., Chance, Rosie, Baker, Alex R., Schmidt, Johan A., Breider, Thomas J.

“…Natural aerosols play a central role in the Earth system. The conversion of dimethyl sulfide to sulfuric acid is the dominant source of oceanic secondary…”
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Isotope Effect in the Carbonyl Sulfide Reaction with O(3 P) by Hattori, Shohei, Schmidt, Johan A, Mahler, Denise W, Danielache, Sebastian O, Johnson, Matthew S, Yoshida, Naohiro

“…The sulfur kinetic isotope effect (KIE) in the reaction of carbonyl sulfide (OCS) with O(3 P) was studied in relative rate experiments at 298 ± 2 K and 955 ±…”
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On the origin of the asymmetric shape of the HCl photodissociation cross section by Schmidt, Johan A., Johnson, Matthew S., Grage, Mette M.-L., Nyman, Gunnar

“…The photodissociation of HCl from 50 000 cm −1 to 75 000 cm −1. A wave packet evolving on two coupled potential energy curves. A first principles treatment of…”
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Urban vertical air pollution gradient and dynamics investigated with low-cost sensors and large-eddy simulations by Frederickson, Louise B., Russell, Hugo S., Raasch, Siegfried, Zhang, Zhaoxi, Schmidt, Johan A., Johnson, Matthew S., Hertel, Ole

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A three-dimensional model of the atmospheric chemistry of E and Z-CF3CH=CHCl (HCFO-1233(zd) (E/Z)) by Sulbaek Andersen, Mads P., Schmidt, Johan A., Volkova, Aleksandra, Wuebbles, Donald J.

“…Using a 3-dimensional global atmospheric chemistry and transport model we investigated the atmospheric degradation of HCFO-1233zd(E), E-CF3CH=CHCl, a…”
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