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Highlighted publications selected by the EOL Science Group and the EOL Directors Office. These include papers considered and nominated for the UCAR Outstanding Publication award, plus other papers chosen to represent a cross section of the wide range of research carried out in EOL. This list is under revision, please visit again soon. A complete list of EOL publications is available in OpenSky.
Abstract. The island of Madeira is well known for giving rise to atmospheric wakes. Strong and unsteady atmospheric wakes, resembling a von Kármán vortex street, are frequently observed in satellite images leeward of Madeira, especially during summer months, when conditions favoring the formation of atmospheric wakes occur frequently under the influence of the Azores high.
Reported here is the analysis of the first airborne measurements of Madeira’s wake collected during the 2010 Island-induced Wake (I-WAKE) campaign. High-resolution in situ and remote sensing data were collected in the I-WAKE by a research aircraft. The measurements reveal distinctive wake signatures, including strong lateral wind shear zones and warm and dry eddies downwind of the island. A strong anticorrelation of the horizontal wind speed and sea surface temperature (SST) was found within the wake. [...]
Citation: Grubišić, V., J. Sachsperger, and R. Caldeira,: Atmospheric wake of Madeira: First aerial observations and numerical simulations. J. Atmos. Sci., 72, 4755-4776, doi: 10.1175/JAS-D-14-0251.1, 2015.
Atmospheric Measurement Techniques, 8, 1073-1087.
Abstract. A field-deployable water vapor profiling instrument that builds on the foundation of the preceding generations of diode-laser-based differential absorption lidar (DIAL) laboratory prototypes was constructed and tested. Significant advances are discussed, including a unique shared telescope design that allows expansion of the outgoing beam for eye-safe operation with optomechanical and thermal stability; multistage optical filtering enabling measurement during daytime bright-cloud conditions; rapid spectral switching between the online and offline wavelengths enabling measurements during changing atmospheric conditions; and enhanced performance at lower ranges by the introduction of a new filter design and the addition of a wide field-of-view channel. [...]
Citation: Spuler, S. M., Repasky, K. S., Morley, B., Moen, D., Hayman, M., and Nehrir, A. R.: Field-deployable diode-laser-based differential absorption lidar (DIAL) for profiling water vapor, Atmos. Meas. Tech., 8, 1073-1087, doi:10.5194/amt-8-1073-2015, 2015.
(This paper was EOL's nomination for the UCAR Outstanding Publication Award for 2015)
For more information see the Water Vapor DIAL web page
Atmospheric Measurement Techniques, 7, 3215-3231.
Abstract:A new laser air-motion sensor measures the true airspeed with a standard uncertainty of less than 0.1 m s−1 and so reduces uncertainty in the measured component of the relative wind along the longitudinal axis of the aircraft to about the same level. The calculated pressure expected from that airspeed at the inlet of a pitot tube then provides a basis for calibrating the measurements of dynamic and static pressure, reducing standard uncertainty in those measurements to less than 0.3 hPa and the precision applicable to steady flight conditions to about 0.1 hPa. [...]
Citation: Cooper, W. A., Spuler, S. M., Spowart, M., Lenschow, D. H., and Friesen, R. B.: Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor, Atmos. Meas. Tech., 7, 3215-3231, doi:10.5194/amt-7-3215-2014, 2014.
For more information see the LAMS web page
Journal of the Atmospheric Sciences, 72, 2703-2718.
Abstract: Based upon on the findings of Y. Li and R. E. Carbone, the association of tropical rainfall with SST structure is further explored, with emphasis on the MJO passband. Analyses include the tropical Indian Ocean, Maritime Continent, and tropical western Pacific regions. The authors examine the anomalies of and correlations between SST structure, the frequency of rainfall events, and rainfall amount. Based on detailed examination of a 49-month time series, all findings are statistical inferences and interpretations consistent with established theory. [...]
Citation: Carbone, R.E., and Y. Li, 2015: Tropical oceanic rainfall and sea surface temperature structure: Parsing causation from correlation in the MJO. J. Atmos. Sci., 72, 2703-2718, DOI: 10.1175/JAS-D-14-0226.1.
Boundary-Layer Meteorology,155, 371-395
Abstract: We propose that flow distortion within a non-orthogonal CSAT3 sonic anemometer is primarily due to transducer shadowing, which is caused by wakes in the lee of the acoustic transducers impinging on their measurement paths. The dependence of transducer shadowing on sonic path geometry, wind direction and atmospheric stability is investigated with simulations that use surface-layer data from the Horizontal Array Turbulence Study (HATS) field program and canopy roughness-sublayer data from the CHATS (Canopy HATS) field program. We demonstrate the efficacy of correcting the CSAT3 for transducer shadowing with measurements of its flow distortion in the NCAR wind tunnel, combined with 6 months of data collected in the atmospheric surface layer with adjacent CSAT3 and orthogonal ATI-K sonic anemometers at the NCAR Marshall field site. [...]
Citation: Horst, T.W., S.R. Semmer, & G. Maclean, 2015: Bound-Layer Meteorol, 155, 371. doi:10.1007/s10546-015-0010-3
Optics Express, 22, 16976-16990.
Abstract: Oriented particles can exhibit different polarization properties than randomly oriented particles. These properties cannot be resolved by conventional polarization lidar systems and are capable of corrupting the interpretation of depolarization ratio measurements. Additionally, the typical characteristics of backscatter phase matrices from atmospheric oriented particles are not well established. The National Center for Atmospheric Research High Spectral Resolution Lidar was outfitted in spring of 2012 to measure the backscatter phase matrix, allowing it to fully characterize the polarization properties of oriented particles. [...]
Citation: Hayman, M., S. M. Spuler, and B. M. Morley, 2014: Polarization lidar observations of backscatter phase matrices from oriented ice crystals and rain. Optics Express, 22, 16976-16990, doi:10.1364/OE.22.016976.
For more information see the HSRL web page
Monthly Weather Review, 142, 573-589
Abstract: The concept and mathematical framework of the distance velocity–azimuth display (DVAD) methodology is presented. DVAD uses rVd (Doppler velocity scaled by the distance from the radar to a gate, r) as the basis to display, interpret, and extract information from single Doppler radar observations. Both linear and nonlinear wind fields can be represented by the same Cartesian polynomial with different orders. DVAD is mathematically concise and superior to the velocity–azimuth display (VAD) in interpreting and deducing flow characteristics. [...]
Citation: Lee, W.-C., X. Tang, and B.J. Jou, 2014: Distance Velocity-Azimuth Display (DVAD)—New interpretation and analysis of Doppler velocity. Mon. Weather Rev., 142, 573-589, DOI: 10.1175/MWR-D-13-00196.1.
Bulletin of the American Meteorological Society, 94, 1661-1674.
Abstract: Constellations of driftsonde systems— gondolas floating in the stratosphere and able to release dropsondes upon command— have so far been used in three major field experiments from 2006 through 2010. With them, high-quality, high-resolution, in situ atmospheric profiles were made over extended periods in regions that are otherwise very difficult to observe. The measurements have unique value for verifying and evaluating numerical weather prediction models and global data assimilation systems; they can be a valuable resource to validate data from remote sensing instruments, especially on satellites, but also airborne or ground-based remote sensors. [...]
Citation: Cohn, S.A., T.F. Hock, P. Cocquerez (more) , 2013: Driftsondes: Providing in situ long-duration dropsonde observations over remote regions. Bull. Amer. Met. Soc., 94, 1661-1674, DOI: 10.1175/BAMS-D-12-00075.1.
For more information see the Driftsonde web page
Journal of Atmospheric Science, 69, 2983-2994
Abstract: The authors have examined 4 years of satellite-derived SST and rainfall data in anticipation of a relationship between SST structure and the excitation of convective rainfall. The results exhibit a strong excitation signal consistent with the presence of mesoscale SST gradients in about 75% of approximately 10 000 rainfall onset events. Rainfall onset events occur at locations with enhanced horizontal convergence, as inferred by the Laplacian of SST on scales of order 100 km. The daily SST field exhibits multiscale patchiness, spanning a 2+°C range. The signal is disproportionately large at SSTs that are 0.25°C above the mean, [...]
Citation: Yanping Li and R. E. Carbone, 2012: Excitation of Rainfall over the Tropical Western Pacific. J. Atmos. Sci., 69, 2983-2994, doi: 10.1175/JAS-D-11-0245.1
(This paper received the UCAR Outstanding Publication Award for 2016)
Radio Science, 45, DOI: 10.1029/2009RS004280.
Abstract: A technique for the estimation of humidity in the lower troposphere using simultaneous dual-wavelength radar observations is proposed and tested. The method compares the reflectivity from clouds and precipitation of a non-attenuated wavelength (S-band, 10 cm) and an attenuated wavelength (Ka-band, 8 mm) to compute the clear-air gaseous attenuation at the attenuated wavelength. These estimates are of total gaseous attenuation on radar ray segments that extend from the radar to a cloud/precipitation echo or from one echo to another. [...]
Citation: Ellis, S.M., and J. Vivekanandan, 2010: Water vapor estimates using simultaneous dual-wavelength radar observations. Radio Science, 45, RS5002, DOI: 10.1029/2009RS004280.
Journal of Atmospheric and Oceanic Technology, 27, 1583–1598
Abstract: In this two-part paper the biases of polarimetric variables from simultaneous horizontally and vertically transmitted (SHV) data are investigated. Here, in Part I, a radar-scattering model is developed and antenna polarization errors are investigated and estimated. In Part II, experimental data from the National Center for Atmospheric Research S-band dual-polarization Doppler radar (S-Pol) and the National Severe Storms Laboratory polarimetric Weather Surveillance Radar-1988 Doppler (WSR-88D) radar, KOUN, are used to illustrate biases in differential reflectivity (Zdr). [...]
Citation: Hubbert, J.C., S.M. Ellis, M.J. Dixon, and G. Meymaris, 2010: Modeling, error analysis and evaluation of dual polarization variables obtained from simultaneous horizontal and vertical polarization transmit radar. Part I: Modeling and antenna errors. J. Atmos. Ocean. Tech., 27, 1583–1598, DOI: 10.1175/2010JTECHA1336.1.
(A two part paper nominated by EOL to the UCAR Outstanding Publication Award in 2014)