Detlev Helmig : rechercher sur Z-Library

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1

Discrepancy between simulated and observed ethane and propane levels explained by underestimated fossil emissions

Dalsøren, Stig B., Myhre, Gunnar, Hodnebrog, Øivind, Myhre, Cathrine Lund, Stohl, Andreas, Pisso, Ignacio, Schwietzke, Stefan, Höglund-Isaksson, Lena, Helmig, Detlev, Reimann, Stefan, Sauvage, Stéphan

Journal:

Nature Geoscience

Année:

2018

Langue:

english

Fichier:

PDF, 3.37 MB

english, 2018

2

Biogenic volatile organic compound emissions (BVOCs) II. Landscape flux potentials from three continental sites in the U.S.

Detlev Helmig, Lee F. Klinger, Alex Guenther, Lee Vierling, Chris Geron, Patrick Zimmerman

Journal:

Année:

1999

Langue:

english

Fichier:

PDF, 846 KB

english, 1999

3

Biogenic volatile organic compound emissions (BVOCs) I. Identifications from three continental sites in the U.S.

Detlev Helmig, Lee F. Klinger, Alex Guenther, Lee Vierling, Chris Geron, Patrick Zimmerman

Journal:

Année:

1999

Langue:

english

Fichier:

PDF, 1.35 MB

english, 1999

4

Isoprene Biosynthesis in Bacillus subtilis via the Methylerythritol Phosphate Pathway

Wagner, William P., Helmig, Detlev, Fall, Ray

Journal:

Journal of Natural Products

Année:

2000

Langue:

english

Fichier:

PDF, 64 KB

english, 2000

5

Estimating urban vegetation cover fraction using Google Earth® images

Duhl, Tiffany R., Guenther, Alex, Helmig, Detlev

Journal:

Journal of Land Use Science

Année:

2012

Langue:

english

Fichier:

PDF, 988 KB

english, 2012

6

Isoprene emissions and impacts over an ecological transition region in the U.S. Upper Midwest inferred from tall tower measurements

Hu, Lu, Millet, Dylan B., Baasandorj, Munkhbayar, Griffis, Timothy J., Turner, Peter, Helmig, Detlev, Curtis, Abigale J., Hueber, Jacques

Journal:

Journal of Geophysical Research Atmospheres

Année:

2015

Langue:

english

Fichier:

PDF, 19.99 MB

english, 2015

7

White on Green: Under-Snow Microbial Processes and Trace Gas Fluxes through Snow, Niwot Ridge, Colorado Front Range || Process-Level Controls on CO₂ Fluxes from a Seasonally Snow-Covered Subalpine Meadow Soil, Niwot Ridge, Colorado

Daniel Liptzin, Mark W. Williams, Detlev Helmig, Brian Seok, Gianluca Filippa, Kurt Chowanski and Jacques Hueber

Journal:

Biogeochemistry

Année:

2009

Langue:

english

Fichier:

PDF, 2.56 MB

english, 2009

8

Flame control accessory for GC-FID operation with autosampler injection

Detlev Helmig, Norbert Schwarzer, Jürgen Steinhanses

Journal:

Journal of Separation Science

Année:

1990

Langue:

english

Fichier:

PDF, 292 KB

english, 1990

9

Artifact formation from the use of potassium-iodide-based ozone traps during atmospheric sampling of trace organic gases

Detlev Helmig, Jim Greenberg

Journal:

Journal of Separation Science

Année:

1995

Langue:

english

Fichier:

PDF, 479 KB

english, 1995

10

Sampling, storage, and analysis of C2–C7 non-methane hydrocarbons from the US National Oceanic and Atmospheric Administration Cooperative Air Sampling Network glass flasks

Jan Pollmann, Detlev Helmig, Jacques Hueber, Christian Plass-Dülmer, Pieter Tans

Journal:

Journal of Chromatography A

Année:

2008

Langue:

english

Fichier:

PDF, 1.62 MB

english, 2008

11

Gas chromatography system for the automated, unattended, and cryogen-free monitoring of C2 to C6 non-methane hydrocarbons in the remote troposphere

David Tanner, Detlev Helmig, Jacques Hueber, Paul Goldan

Journal:

Journal of Chromatography A

Année:

2006

Langue:

english

Fichier:

PDF, 643 KB

english, 2006

12

Evaluation of solid adsorbent materials for cryogen-free trapping—gas chromatographic analysis of atmospheric C2–C6 non-methane hydrocarbons

Jan Pollmann, Detlev Helmig, Jacques Hueber, David Tanner, Pieter P. Tans

Journal:

Journal of Chromatography A

Année:

2006

Langue:

english

Fichier:

PDF, 2.19 MB

english, 2006

13

Minimization of water vapor interference in the analysis of non-methane volatile organic compounds by solid adsorbent sampling

Christine M. Karbiwnyk, Craig S. Mills, Detlev Helmig, John W. Birks

Journal:

Journal of Chromatography A

Année:

2002

Langue:

english

Fichier:

PDF, 244 KB

english, 2002

14

Calibration system and analytical considerations for quantitative sesquiterpene measurements in air

Detlev Helmig, Tobias Revermann, Jan Pollmann, Oliver Kaltschmidt, Aidaris Jiménez Hernández, Florence Bocquet, Donald David

Journal:

Journal of Chromatography A

Année:

2003

Langue:

english

Fichier:

PDF, 888 KB

english, 2003

15

Air analysis by gas chromatography

Journal:

Journal of Chromatography A

Année:

1999

Langue:

english

Fichier:

PDF, 125 KB

english, 1999

16

Winter and summer nitrous oxide and nitrogen oxides fluxes from a seasonally snow-covered subalpine meadow at Niwot Ridge, Colorado

Gianluca Filippa, Michele Freppaz, Mark W. Williams, Detlev Helmig, Daniel Liptzin, Brian Seok, Brad Hall, Kurt Chowanski

Journal:

Biogeochemistry

Année:

2009

Langue:

english

Fichier:

PDF, 507 KB

english, 2009

17

An automated system for continuous measurements of trace gas fluxes through snow: an evaluation of the gas diffusion method at a subalpine forest site, Niwot Ridge, Colorado

Brian Seok, Detlev Helmig, Mark W. Williams, Daniel Liptzin, Kurt Chowanski, Jacques Hueber

Journal:

Biogeochemistry

Année:

2009

Langue:

english

Fichier:

PDF, 1.07 MB

english, 2009

18

Process-level controls on CO2fluxes from a seasonally snow-covered subalpine meadow soil, Niwot Ridge, Colorado

Daniel Liptzin, Mark W. Williams, Detlev Helmig, Brian Seok, Gianluca Filippa, Kurt Chowanski, Jacques Hueber

Journal:

Biogeochemistry

Année:

2009

Langue:

english

Fichier:

PDF, 850 KB

english, 2009

19

Release and uptake of volatile inorganic and organic gases through the snowpack at Niwot Ridge, Colorado

Detlev Helmig, Eric Apel, Donald Blake, Laurens Ganzeveld, Barry L. Lefer, Simone Meinardi, Aaron L. Swanson

Journal:

Biogeochemistry

Année:

2009

Langue:

english

Fichier:

PDF, 492 KB

english, 2009

20

Fluxes and chemistry of nitrogen oxides in the Niwot Ridge, Colorado, snowpack

Detlev Helmig, Brian Seok, Mark W. Williams, Jacques Hueber, Robert Sanford

Journal:

Biogeochemistry

Année:

2009

Langue:

english

Fichier:

PDF, 672 KB

english, 2009

21

White on green: under-snow microbial processes and trace gas fluxes through snow, Niwot Ridge, Colorado Front Range

Mark W. Williams, Detlev Helmig, Peter Blanken

Journal:

Biogeochemistry

Année:

2009

Langue:

english

Fichier:

PDF, 331 KB

english, 2009

22

Automated in situ gas chromatographic-mass spectrometric analysis of ppt level volatile organic trace gases using multistage solid-adsorbent trapping

Detlev Helmig, James P. Greenberg

Journal:

Journal of Chromatography A

Année:

1994

Langue:

english

Fichier:

PDF, 936 KB

english, 1994

23

Artifact-free preparation, storage and analysis of solid adsorbent sampling cartridges used in the analysis of volatile organic compounds in air

Journal:

Journal of Chromatography A

Année:

1996

Langue:

english

Fichier:

PDF, 255 KB

english, 1996

24

Water Adsorption Capacity of the Solid Adsorbents Tenax TA, Tenax GR, Carbotrap, Carbotrap C, Carbosieve SIII, and Carboxen 569 and Water Management Techniques for the Atmospheric Sampling of Volatile Organic Trace Gases

Helmig, Detlev., Vierling, Lee.

Journal:

Analytical Chemistry

Année:

1995

Langue:

english

Fichier:

PDF, 816 KB

english, 1995

25

Improvements in analysis of atmospheric peroxyacetyl nitrate (PAN)

Detlev Helmig, Josef Müller, Werner Klein

Journal:

Atmospheric Environment (1967)

Année:

1967

Langue:

english

Fichier:

PDF, 615 KB

english, 1967

26

Bioassay-directed fractionation of mutagenic PAH atmospheric photooxidation products and ambient particulate extracts

Janet Arey, William P. Harger, Detlev Helmig, Roger Atkinson

Journal:

Mutation Research Letters

Année:

1992

Langue:

english

Fichier:

PDF, 752 KB

english, 1992

27

Analytical techniques for sesquiterpene emission rate studies in vegetation enclosure experiments

Detlev Helmig, Florence Bocquet, Jan Pollmann, Tobias Revermann

Journal:

Atmospheric Environment

Année:

2004

Langue:

english

Fichier:

PDF, 520 KB

english, 2004

28

Sesquiterpene emissions from loblolly pine and their potential contribution to biogenic aerosol formation in the Southeastern US

Detlev Helmig, John Ortega, Alex Guenther, Jeffrey D. Herrick, Chris Geron

Journal:

Atmospheric Environment

Année:

2006

Langue:

english

Fichier:

PDF, 304 KB

english, 2006

29

What is causing high ozone at Summit, Greenland?

Detlev Helmig, Samuel J. Oltmans, Thomas O. Morse, Jack E. Dibb

Journal:

Atmospheric Environment

Année:

2007

Langue:

english

Fichier:

PDF, 1.88 MB

english, 2007

30

Boundary-layer dynamics and its influence on atmospheric chemistry at Summit, Greenland

Lana Cohen, Detlev Helmig, William D. Neff, Andrey A. Grachev, Christopher W. Fairall

Journal:

Atmospheric Environment

Année:

2007

Langue:

english

Fichier:

PDF, 1.47 MB

english, 2007

31

A review of surface ozone in the polar regions

Detlev Helmig, Samuel J. Oltmans, Daniel Carlson, Jean-Francois Lamarque, Anna Jones, Casper Labuschagne, Kurt Anlauf, Katherine Hayden

Journal:

Atmospheric Environment

Année:

2007

Langue:

english

Fichier:

PDF, 4.32 MB

english, 2007

32

Elevated ozone in the boundary layer at South Pole

Detlev Helmig, Bryan Johnson, Samuel J. Oltmans, William Neff, Fred Eisele, Douglas D. Davis

Journal:

Atmospheric Environment

Année:

2008

Langue:

english

Fichier:

PDF, 1.94 MB

english, 2008

33

Flux estimates and OH reaction potential of reactive biogenic volatile organic compounds (BVOCs) from a mixed northern hardwood forest

John Ortega, Detlev Helmig, Alex Guenther, Peter Harley, Shelley Pressley, Christoph Vogel

Journal:

Atmospheric Environment

Année:

2007

Langue:

english

Fichier:

PDF, 820 KB

english, 2007

34

Episodes of high surface-ozone amounts at South Pole during summer and their impact on the long-term surface-ozone variation

Samuel J. Oltmans, Bryan J. Johnson, Detlev Helmig

Journal:

Atmospheric Environment

Année:

2008

Langue:

english

Fichier:

PDF, 1.57 MB

english, 2008

35

Nitric oxide in the boundary-layer at South Pole during the Antarctic Tropospheric Chemistry Investigation (ANTCI)

Detlev Helmig, Bryan J. Johnson, Matt Warshawsky, Thomas Morse, William D. Neff, Fred Eisele, Douglas D. Davis

Journal:

Atmospheric Environment

Année:

2008

Langue:

english

Fichier:

PDF, 1.01 MB

english, 2008

36

Antarctic Tropospheric Chemistry Investigation (ANTCI) 2003 overview

Fred Eisele, Douglas D. Davis, Detlev Helmig, Samuel J. Oltmans, William Neff, Greg Huey, David Tanner, Gao Chen, Jim Crawford, Richard Arimoto, Martin Buhr, Lee Mauldin, Manuel Hutterli, Jack Dibb, D

Journal:

Atmospheric Environment

Année:

2008

Langue:

english

Fichier:

PDF, 204 KB

english, 2008

37

Evaluation of ozone measurements from a tethered balloon-sampling platform at South Pole Station in December 2003

Bryan J. Johnson, Detlev Helmig, Samuel J. Oltmans

Journal:

Atmospheric Environment

Année:

2008

Langue:

english

Fichier:

PDF, 1.03 MB

english, 2008

38

A reassessment of Antarctic plateau reactive nitrogen based on ANTCI 2003 airborne and ground based measurements

Douglas D. Davis, Jon Seelig, Greg Huey, Jim Crawford, Gao Chen, Yuhang Wang, Marty Buhr, Detlev Helmig, William Neff, Don Blake, Rich Arimoto, Fred Eisele

Journal:

Atmospheric Environment

Année:

2008

Langue:

english

Fichier:

PDF, 973 KB

english, 2008

39

Seasonal ozone behavior along an elevation gradient in the Colorado Front Range Mountains

Molly Brodin, Detlev Helmig, Samuel Oltmans

Journal:

Atmospheric Environment

Année:

2010

Langue:

english

Fichier:

PDF, 2.78 MB

english, 2010

40

Comparison of ozone concentrations on a surface elevation gradient with balloon-borne ozonesonde measurements

Molly Brodin, Detlev Helmig, Bryan Johnson, Samuel Oltmans

Journal:

Atmospheric Environment

Année:

2011

Langue:

english

Fichier:

PDF, 1.01 MB

english, 2011

41

Ozone and meteorological boundary-layer conditions at Summit, Greenland, during 3–21 June 2000

Detlev Helmig, James Boulter, Donald David, John W Birks, Nicolas J Cullen, Konrad Steffen, Bryan J Johnson, Samuel J Oltmans

Journal:

Atmospheric Environment

Année:

2002

Langue:

english

Fichier:

PDF, 556 KB

english, 2002

42

Ozone removal techniques in the sampling of atmospheric volatile organic trace gases

Journal:

Atmospheric Environment

Année:

1997

Langue:

english

Fichier:

PDF, 1.75 MB

english, 1997

43

Long-term decline of global atmospheric ethane concentrations and implications for methane

Simpson, Isobel J., Sulbaek Andersen, Mads P., Meinardi, Simone, Bruhwiler, Lori, Blake, Nicola J., Helmig, Detlev, Rowland, F. Sherwood, Blake, Donald R.

Journal:

Année:

2012

Langue:

english

Fichier:

PDF, 2.20 MB

english, 2012

44

Comparison of computed and measured photooxidant concentrations at a forest site

Eberhard Renner, Wolfgang Rolle, Detlev Helmig

Journal:

Année:

1993

Langue:

english

Fichier:

PDF, 656 KB

english, 1993

45

Approaches for quantifying reactive and low-volatility biogenic organic compound emissions by vegetation enclosure techniques – Part B: Applications

John Ortega, Detlev Helmig, Ryan W. Daly, David M. Tanner, Alex B. Guenther, Jeffrey D. Herrick

Journal:

Année:

2008

Langue:

english

Fichier:

PDF, 1.52 MB

english, 2008

46

Approaches for quantifying reactive and low-volatility biogenic organic compound emissions by vegetation enclosure techniques – Part A

John Ortega, Detlev Helmig

Journal:

Année:

2008

Langue:

english

Fichier:

PDF, 294 KB

english, 2008

47

Ozone uptake to the polar snowpack at Summit, Greenland

Detlev Helmig, Florence Bocquet, Lana Cohen, Samuel J. Oltmans

Journal:

Atmospheric Environment

Année:

2007

Langue:

english

Fichier:

PDF, 2.27 MB

english, 2007

48

Measurements of landscape-scale fluxes of carbon dioxide in the Peruvian Amazon by vertical profiling through the atmospheric boundary layer

Kuck, Laura R., Smith, Tyrell, Balsley, Ben B., Helmig, Detlev, Conway, Thomas J., Tans, Pieter P., Davis, Kenneth, Jensen, Michael L., Bognar, John A., Arrieta, Rosaura Vazquez, Rodriquez, Rodolfo, B

Journal:

Journal of Geophysical Research

Année:

2000

Langue:

english

Fichier:

PDF, 983 KB

english, 2000

49

Spring and summertime diurnal surface ozone fluxes over the polar snow at Summit, Greenland

Helmig, Detlev, Cohen, Lana D., Bocquet, Florence, Oltmans, Samuel, Grachev, Andrey, Neff, William

Journal:

Geophysical Research Letters

Année:

2009

Langue:

english

Fichier:

PDF, 176 KB

english, 2009

50

Net ecosystem fluxes of isoprene over tropical South America inferred from Global Ozone Monitoring Experiment (GOME) observations of HCHO columns

Barkley, Michael P., Palmer, Paul I., Kuhn, Uwe, Kesselmeier, Juergen, Chance, Kelly, Kurosu, Thomas P., Martin, Randall V., Helmig, Detlev, Guenther, Alex

Journal:

Journal of Geophysical Research

Année:

2008

Langue:

english

Fichier:

PDF, 4.10 MB

english, 2008