Within the National Oceanic and Atmospheric Administration National Weather Service, the hybrid ensemble-variational system (Gridpoint Statistical Interpolation, GSI) is run together with the 80-member ensemble square root filter (EnSRF) operationally for the global forecast data assimilation system. EnSRF uses observation operator from GSI: current operational configuration requires 81 runs of GSI in the observation operator mode to run EnSRF (for each of the 80 ensemble members and for the ensemble mean). To reduce data assimilation cycle computation time, a GSI-EnSRF configuration that requires a single run of the GSI system in the observation operator mode was developed. In this configuration EnSRF uses full observation operator for the ensemble mean and linearized observation operator for the ensemble perturbations. Comparison of the two approaches shows that using linearized observation operator for ensemble perturbations compared to using full observation operator does not change the analysis results significantly and allows to reduce overall data assimilation cycle computation time.
Bergman, J. W.; Pfister, L.; Kinnison, D. E.; Hintsa, E. J.; Thornberry, T. D.;
Published Date:
2017
Source:
Journal of Geophysical Research-Atmospheres, 122(11), 6025-6042.
Description:
To evaluate the utility of trajectory analysis in the tropical upper troposphere/lower stratosphere, Lagrangian predictions of ozone mixing ratio are compared to observations from the Airborne Tropical TRopopause EXperiment. Model predictions are bas...
Liu, J.; Scheuer, E.; Dibb, J.; Diskin, G. S.; Ziemba, L. D.; Thornhill, K. L.; Anderson, B. E.; Wisthaler, A.; Mikoviny, T.; Devi, J. J.; Bergin, M.; Perring, A. E.; Markovic, M. Z.; Schwarz, J. P.; Campuzano-Jost, P.; Day, D. A.; Jimenez, J. L.; Weber, R. J.;
Published Date:
2015
Source:
Atmospheric Chemistry and Physics, 15(14), 7841-7858.
Description:
Chemical components of organic aerosol (OA) selectively absorb light at short wavelengths. In this study, the prevalence, sources, and optical importance of this so-called brown carbon (BrC) aerosol component are investigated throughout the North Ame...
Baidar, S.; Hardesty, R. M.; Kim, S. W.; Langford, A. O.; Oetjen, H.; Senff, C. J.; Trainer, M.; Volkamer, R.;
Published Date:
2015
Source:
Geophysical Research Letters, 42(21), 9457-9464.
Description:
We have observed lower nitrogen dioxide (NO2) and ozone (O-3) during a hot weekend (summer 2010) from aircraft over the entire South Coast Air Basin (SoCAB). Surface concentrations of NO2, O-3, and temperature from 1996 to 2014 corroborate that this ...
Jubb, A. M.; McGillen, M. R.; Portmann, R. W.; Daniel, J. S.; Burkholder, J. B.;
Published Date:
2015
Source:
Geophysical Research Letters, 42(21), 9505-9511.
Description:
A previously uncharacterized atmospheric source of the persistent greenhouse gas tetrafluoromethane, CF4, has been identified in the UV photolysis of trifluoroacetyl fluoride, CF3C(O)F, which is a degradation product of several halocarbons currently ...
Hayes, P. L.; Carlton, A. G.; Baker, K. R.; Ahmadov, R.; Washenfelder, R. A.; Alvarez, S.; Rappengluck, B.; Gilman, J. B.; Kuster, W. C.; de Gouw, J. A.; Zotter, P.; Prevot, A. S. H.; Szidat, S.; Kleindienst, T. E.; Offenberg, J. H.; Ma, P. K.; Jimenez, J. L.;
Published Date:
2015
Source:
Atmospheric Chemistry and Physics, 15(10), 5773-5801.
Description:
Four different literature parameterizations for the formation and evolution of urban secondary organic aerosol (SOA) frequently used in 3-D models are evaluated using a 0-D box model representing the Los Angeles metropolitan region during the Califor...
Jordan, C. E.; Pszenny, A. A. P.; Keene, W. C.; Cooper, O. R.; Deegan, B.; Maben, J.; Routhier, M.; Sander, R.; Young, A. H.;
Published Date:
2015
Source:
Journal of Geophysical Research-Atmospheres, 120(2), 678-694.
Description:
The Nitrogen, Aerosol Composition, and Halogens on a Tall Tower campaign (February-March 2011) near Boulder, Colorado, investigated nighttime ClNO2 production and processing. Virtually all particulate Cl was in the form of ionic Cl-. The size distrib...
Fleming, E. L.; George, C.; Heard, D. E.; Jackman, C. H.; Kurylo, M. J.; Mellouki, W.; Orkin, V. L.; Swartz, W. H.; Wallington, T. J.; Wine, P. H.; Burkholder, J. B.;
Published Date:
2015
Source:
Journal of Geophysical Research-Atmospheres, 120(10), 5267-5293.
Description:
The atmospheric loss processes of N2O and CH4, their estimated uncertainties, lifetimes, and impacts on ozone abundance and long-term trends are examined using atmospheric model calculations and updated kinetic and photochemical parameters and uncert...
Sun, K.; Cady-Pereira, K.; Miller, D. J.; Tao, L.; Zondlo, M. A.; Nowak, J. B.; Neuman, J. A.; Mikoviny, T.; Muller, M.; Wisthaler, A.; Scarino, A. J.; Hostetler, C. A.;
Published Date:
2015
Source:
Journal of Geophysical Research-Atmospheres, 120(10), 5140-5154.
Description:
Ammonia measurements from a vehicle-based, mobile open-path sensor and those from aircraft were compared with Tropospheric Emission Spectrometer (TES) NH3 columns at the pixel scale during the NASA Deriving Information on Surface conditions from Colu...
The recently developed NOAA Water instrument is a two-channel, closed-path, tunable diode laser absorption spectrometer designed for the measurement of upper troposphere/lower stratosphere water vapor and enhanced total water (vapor + inertially enha...
Journal of Advances in Modeling Earth Systems, 7(2), 791-805.
Description:
Model intercomparisons have identified important deficits in the representation of the stable boundary layer by turbulence parametrizations used in current weather and climate models. However, detrimental impacts of more realistic schemes on the larg...
Graven, H.; Allison, C. E.; Etheridge, D. M.; Hammer, S.; Keeling, R. F.; Levin, I.; Meijer, H. A. J.; Rubino, M.; Tans, P. P.; Trudinger, C. M.; Vaughn, B. H.; White, J. W. C.;
Published Date:
2017
Source:
Geoscientific Model Development, 10(12), 4405-4417.
Description:
The isotopic composition of carbon (Delta C-14 and delta C-13) in atmospheric CO2 and in oceanic and terrestrial carbon reservoirs is influenced by anthropogenic emissions and by natural carbon exchanges, which can respond to and drive changes in cli...
Xiong, F.; McAvey, K. M.; Pratt, K. A.; Groff, C. J.; Hostetler, M. A.; Lipton, M. A.; Starn, T. K.; Seeley, J. V.; Bertman, S. B.; Teng, A. P.; Crounse, J. D.; Nguyen, T. B.; Wennberg, P. O.; Misztal, P. K.; Goldstein, A. H.; Guenther, A. B.; Koss, A. R.; Olson, K. F.; de Gouw, J. A.; Baumann, K.; Edgerton, E. S.; Feiner, P. A.; Zhang, L.; Miller, D. O.; Brune, W. H.; Shepson, P. B.;
Published Date:
2015
Source:
Atmospheric Chemistry and Physics, 15(19), 11257-11272.
Description:
Isoprene hydroxynitrates (IN) are tracers of the photochemical oxidation of isoprene in high NOx environments. Production and loss of IN have a significant influence on the NOx cycle and tropospheric O-3 chemistry. To better understand IN chemistry, ...
Huang, C.; Wang, H. L.; Li, L.; Wang, Q.; Lu, Q.; de Gouw, J. A.; Zhou, M.; Jing, S. A.; Lu, J.; Chen, C. H.;
Published Date:
2015
Source:
Atmospheric Chemistry and Physics, 15(19), 11081-11096.
Description:
Volatile organic compound (VOC) species from vehicle exhausts and gas evaporation were investigated by chassis dynamometer and on-road measurements of nine gasoline vehicles, seven diesel vehicles, five motorcycles, and four gas evaporation samples. ...
Lee, L.; Wooldridge, P. J.; deGouw, J.; Brown, S. S.; Bates, T. S.; Quinn, P. K.; Cohen, R. C.;
Published Date:
2015
Source:
Atmospheric Chemistry and Physics, 15(16), 9313-9325.
Description:
Organic nitrates in both gas and condensed (aerosol) phases were measured during the Uintah Basin Winter Ozone Study from January to February in 2012. A high degree of correlation between total aerosol volume at diameters less than 500 nm and the par...
Atmospheric Chemistry and Physics, 15(13), 7351-7367.
Description:
The two-way transition between closed and open cellular convection is addressed in an idealized cloud-resolving modeling framework. A series of cloud-resolving simulations shows that the transition between closed and open cellular states is asymmetri...
Schmitt, C. G.; All, J. D.; Schwarz, J. P.; Arnott, W. P.; Cole, R. J.; Lapham, E.; Celestian, A.;
Published Date:
2015
Source:
Cryosphere, 9(1), 331-340.
Description:
Glaciers in the tropical Andes have been rapidly losing mass since the 1970s. In addition to the documented increase in temperature, increases in light-absorbing particles deposited on glaciers could be contributing to the observed glacier loss. Here...
Janssens-Maenhout, G.; Crippa, M.; Guizzardi, D.; Dentener, F.; Muntean, M.; Pouliot, G.; Keating, T.; Zhang, Q.; Kurokawa, J.; Wankmuller, R.; van der Gon, H. D.; Kuenen, J. J. P.; Klimont, Z.; Frost, G.; Darras, S.; Koffi, B.; Li, M.;
Published Date:
2015
Source:
Atmospheric Chemistry and Physics, 15(19), 11411-11432.
Description:
The mandate of the Task Force Hemispheric Transport of Air Pollution (TF HTAP) under the Convention on Long-Range Transboundary Air Pollution (CLRTAP) is to improve the scientific understanding of the intercontinental air pollution transport, to quan...
Atmospheric Chemistry and Physics, 15(16), 9109-9127.
Description:
Laboratory experiments of efficient oligomerization from methyl vinyl ketone (MVK) in the bulk aqueous phase were simulated in a box model. Kinetic data are applied (if known) or fitted to the observed MVK decay and oligomer mass increase. Upon model...
Van Damme, M.; Clarisse, L.; Dammers, E.; Liu, X.; Nowak, J. B.; Clerbaux, C.; Flechard, C. R.; Galy-Lacaux, C.; Xu, W.; Neuman, J. A.; Tang, Y. S.; Sutton, M. A.; Erisman, J. W.; Coheur, P. F.;
Limited availability of ammonia (NH3) observations is currently a barrier for effective monitoring of the nitrogen cycle. It prevents a full understanding of the atmospheric processes in which this trace gas is involved and therefore impedes determin...
Fried, A.; Barth, M. C.; Bela, M.; Weibring, P.; Richter, D.; Walega, J.; Li, Y.; Pickering, K.; Apel, E.; Hornbrook, R.; Hills, A.; Riemer, D. D.; Blake, N.; Blake, D. R.; Schroeder, J. R.; Luo, Z. J.; Crawford, J. H.; Olson, J.; Rutledge, S.; Betten, D.; Biggerstaff, M. I.; Diskin, G. S.; Sachse, G.; Campos, T.; Flocke, F.; Weinheimer, A.; Cantrell, C.; Pollack, I.; Peischl, J.; Froyd, K.; Wisthaler, A.; Mikoviny, T.; Woods, S.;
Published Date:
2016
Source:
Journal of Geophysical Research-Atmospheres, 121(12), 7430-7460.
Description:
We have developed semi-independent methods for determining CH2O scavenging efficiencies (SEs) during strong midlatitude convection over the western, south-central Great Plains, and southeastern regions of the United States during the 2012 Deep Convec...
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