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  • 1
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    Intercomparison of Field Measurements of Nitrous Acid (HONO) during the SHARP Campaign (2014)
    Wiley
    Details
    Publication Date: 2014-04-11
    Description: Because of the importance of HONO as a radical reservoir, consistent and accurate measurements of its concentration are needed. As part of SHARP (Study of Houston Atmospheric Radical Precursors), time series of HONO were obtained by six different measurement techniques on the roof of the Moody Tower (MT) at the University of Houston. Techniques used were long path differential optical absorption spectroscopy (DOAS), stripping coil- visible absorption photometry (SC-AP), long-path absorption photometry (LOPAP®), mist chamber/ ion chromatography (MC-IC), quantum cascade-tunable infrared laser differential absorption spectroscopy (QC-TILDAS) and ion drift -chemical ionization mass spectrometry (ID-CIMS). Various combinations of techniques were in operation from 15 April through 31 May 2009. All instruments recorded a similar diurnal pattern of HONO concentrations with higher median and mean values during the night than during the day. Highest values were observed in the final two weeks of the campaign. Inlets for the MC-IC, SC-AP, and QC-TILDAS were collocated and agreed most closely with each other based on several measures. Largest differences between pairs of measurements were evident during the day for concentrations 〈 ~100 ppt. Above ~ 200 ppt, concentrations from the SC-AP, MC-IC and QC-TILDAS converged to within about 20%, with slightly larger discrepancies when DOAS was considered. During the first two weeks, HONO measured by ID-CIMS agreed with these techniques, but ID-CIMS reported higher values during the afternoon and evening of the final four weeks, possibly from interference from unknown sources. A number of factors, including building related sources, likely affected measured concentrations.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Direct measurements of the convective recycling of the upper troposphere (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-01-06
    Description: We present a statistical representation of the aggregate effects of deep convection on the chemistry and dynamics of the upper troposphere (UT) based on direct aircraft observations of the chemical composition of the UT over the eastern United States and Canada during summer. These measurements provide unique observational constraints on the chemistry occurring downwind of convection and the rate at which air in the UT is recycled. These results provide quantitative measures that can be used to evaluate global climate and chemistry models.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bertram, Timothy H -- Perring, Anne E -- Wooldridge, Paul J -- Crounse, John D -- Kwan, Alan J -- Wennberg, Paul O -- Scheuer, Eric -- Dibb, Jack -- Avery, Melody -- Sachse, Glen -- Vay, Stephanie A -- Crawford, James H -- McNaughton, Cameron S -- Clarke, Antony -- Pickering, Kenneth E -- Fuelberg, Henry -- Huey, Greg -- Blake, Donald R -- Singh, Hanwant B -- Hall, Samuel R -- Shetter, Richard E -- Fried, Alan -- Heikes, Brian G -- Cohen, Ronald C -- New York, N.Y. -- Science. 2007 Feb 9;315(5813):816-20. Epub 2007 Jan 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17204609" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Lightning NOx Emissions: Reconciling measured and modeled estimates with updated NOx chemistry (2017)
    Wiley
    Details
    Publication Date: 2017-09-07
    Description: Lightning is one of the most important sources of upper tropospheric NO x ; however, there is a large spread in estimates of the global emission rates (2–8 Tg N yr −1 ). We combine upper tropospheric in situ observations from the Deep Convective Clouds and Chemistry (DC3) experiment and global satellite retrieved NO 2 tropospheric column densities to constrain mean lightning NO x (LNO x ) emissions flash −1 . Insights from DC3 indicate that the NO x lifetime is ~3 hours in the region of outflow of thunderstorms, mainly due to production of methyl peroxy nitrate and alkyl and multifunctional nitrates. The lifetime then increases further downwind from the region of outflow. Reinterpreting previous analyses using the 3 hour lifetime reduces the spread among various methods that have been used to calculate mean LNO x emissions flash −1 and indicates a global LNO x emission rate of ~9 Tg N yr −1 , a flux larger than the high end of recent estimates.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
    Electronic Resource
    Electronic Resource
    Initial findings of recent investigations of air-snow relationships in the summit region of the Greenland ice sheet (1992)
    Springer
    Journal of atmospheric chemistry 14 (1992), S. 167-180 
    Details
    ISSN: 1573-0662
    Keywords: Beryllium-7 ; Lead-210 ; Air to Snow Transfer ; Greenland Ice Sheet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The concentrations of7Be,210Pb and major ions have been measured in acrosol and snow samples collected near Summit, Greenland (72°20′N, 38°45′W) in the summers of 1989 and 1990. Comparison to previous results from free tropospheric sampling of the North American Arctic indicates that some acrosol-associated species are as much as 50% depleted in near surface air over the Greenland Ice Sheet. It is shown that local atmospheric processes, particularly isolation of air masses beneath a near surface inversion, can exert dominant influence on the chemistry of surface-level air. These findings illustrate the extreme caution that must be taken if the results of surface-based atmospheric sampling are to be used to examine the relationship between the chemistry of the atmosphere and snow falling from it. Depth profiles of7Be in the surface layers of the snowpack near Summit suggest that up to half of the annual accumulation of snow may occur in the two to three month late spring-early summer period. If this is generally true for the Summit region, previous regional studies of snow chemistry that assumed linear dependence of age on depth to convert depth profiles to time series will have to be reassesed. However, spatial heterogeneity of near surface snow chemistry, that is currently not well understood, makes interpretation of the7Be profiles tentative at present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115232
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    Paper (German National Licenses)
    Fulltext
  • 5
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    ATM aerosol concentrations around the GISP ice core site (1999)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: AERO; Aerological investigations; ALTITUDE; Ammonium; ATM; Calcium; DATE/TIME; Date/time end; Date/time start; GISP; Greenland Ice Core Projects; GRIP/GISP/NGRIP; Ion chromatography; Magnesium; Methane sulfonic acid; Nitrate; Potassium; Sampling/drilling ice; Sodium; Sulfate
    Type: Dataset
    Format: text/tab-separated-values, 1105 data points
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  • 6
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    ATM Concentration of H2O2 in atmosphere (1999)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: DATE/TIME; Day of the year; DRILL; Drilling/drill rig; GISP; GISP2; Greenland Ice Core Projects; GRIP/GISP/NGRIP; Hydrogen peroxide; Peroxidase; Sampling/drilling ice
    Type: Dataset
    Format: text/tab-separated-values, 8448 data points
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  • 7
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    GISP2 Concentration of H2O2 in surface snow (1999)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: DATE/TIME; Day of the year; DRILL; Drilling/drill rig; GISP; GISP2; Greenland Ice Core Projects; GRIP/GISP/NGRIP; Hydrogen peroxide, water; Peroxidase; Sampling/drilling ice
    Type: Dataset
    Format: text/tab-separated-values, 162 data points
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  • 8
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    GISP2 H2O2 Snow Pit Data (1999)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: ADG; Age; AGE; Automatic depth gauges; DEPTH, ice/snow; Event label; GISP; GISP2ADG; GISPThermocouple; Greenland; Greenland Ice Core Projects; GRIP/GISP/NGRIP; Hydrogen peroxide; KentonADG; Latitude of event; Longitude of event; Sampling/drilling ice; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 369 data points
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  • 9
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    Stable isotope record from snow pit South_Pole_SP92 (2017)
    PANGAEA
    Details
    Publication Date: 2023-07-19
    Keywords: DEPTH, ice/snow; East Antarctica; ICEDRILL; Ice drill; South_Pole_SP92; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 540 data points
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  • 10
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    Aircraft and satellite derived arctic BrO profiles of the tropospheric column (2012)
    PANGAEA
    In:  Supplement to: Choi, Su-Jin; Wang, Yujie; Salawitch, Ross J; Canty, T; Joiner, J; Zeng, T; Kurosu, T P; Chance, K; Richter, Astrid; Huey, L G; Liao, Jingjuan; Neuman, J A; Nowak, J B; Dibb, J E; Weinheimer, A J; Diskin, G S; Ryerson, T B; da Silva, A; Curry, J; Kinnison, D; Tilmes, S; Levelt, P F (2012): Analysis of satellite-derived Arctic tropospheric BrO columns in conjunction with aircraft measurements during ARCTAS and ARCPAC. Atmospheric Chemistry and Physics, 12(3), 1255-1285, https://doi.org/10.5194/acp-12-1255-2012
    Details
    Publication Date: 2023-12-13
    Description: We derive tropospheric column BrO during the ARCTAS and ARCPAC field campaigns in spring 2008 using retrievals of total column BrO from the satellite UV nadir sensors OMI and GOME-2 using a radiative transfer model and stratospheric column BrO from a photochemical simulation. We conduct a comprehensive comparison of satellite-derived tropospheric BrO column to aircraft in-situ observations of BrO and related species. The aircraft profiles reveal that tropospheric BrO, when present during April 2008, was distributed over a broad range of altitudes rather than being confined to the planetary boundary layer (PBL). Perturbations to the total column resulting from tropospheric BrO are the same magnitude as perturbations due to longitudinal variations in the stratospheric component, so proper accounting of the stratospheric signal is essential for accurate determination of satellite-derived tropospheric BrO. We find reasonably good agreement between satellite-derived tropospheric BrO and columns found using aircraft in-situ BrO profiles, particularly when satellite radiances were obtained over bright surfaces (albedo 〉0.7), for solar zenith angle 〈80° and clear sky conditions. The rapid activation of BrO due to surface processes (the bromine explosion) is apparent in both the OMI and GOME-2 based tropospheric columns. The wide orbital swath of OMI allows examination of the evolution of tropospheric BrO on about hourly time intervals near the pole. Low surface pressure, strong wind, and high PBL height are associated with an observed BrO activation event, supporting the notion of bromine activation by high winds over snow.
    Keywords: Barrow_Utqiagvik; Barrow, Alaska, USA; International Polar Year (2007-2008); IPY; MULT; Multiple investigations; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158
    Type: Dataset
    Format: application/zip, 4 datasets
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