Browsing UMBC Physics Department by Title

Now showing items 41-60 of 863

    • Assessing Water Budget Sensitivity to Precipitation Forcing Errors in Potomac River Basin Using the VIC Hydrologic Model CyberTraining: Big Data + High-Performance Computing + Atmospheric Sciences 

      Majumder, Reetam; Walid, Redwan; Zheng, Jianyu; Zhang, Zhibo; Wang, Jianwu; Gobbert, Matthias K.; Gangopadhyay, Aryya; Barajas, Carlos; Guo, Pei; Rajapakshe, Chamara; Markert, Kel; Mehta, Amita; Neerchal, Nagaraj K. (2019)
      The Potomac River Basin is a watershed located on the East Coast of the USA across West Virginia, Virginia, Pennsylvania, Maryland, and the District of Columbia. Inter-annual variations in precipitation makes it challenging ...

    • Assessment of Planetary Boundary Layer parametrizations and urban heat island comparison: Impacts and implications for tracer transport 

      Lopez-Coto, Israel; Hicks, Micheal; Karion, Anna; Sakai, Ricardo K.; Prasad, Kuldeep; Whetstone, James (American Meteorological Society (AMS), 2020-08-27)
      Accurate simulation of planetary boundary layer height (PBLH) is key to greenhouse gas emission estimation, air quality prediction and weather forecasting. This manuscript describes an extensive performance assessment of ...

    • An Assessment of the Impacts of Cloud Vertical Heterogeneity on Global Ice Cloud Data Records From Passive Satellite Retrievals 

      Wang, Chenxi; Platnick, Steven; Fauchez, Thomas; Meyer, Kerry; Zhang, Zhibo; Iwabuchi, Hironobu; Kahn, Brian H. (AGU Pubication, 2019-02-02)
      Spaceborne passive instruments are widely used to infer long‐term ice cloud properties due to their large temporal and spatial coverage. Although observations from active instruments demonstrate ice particle variability ...

    • An assessment of the tropical humidity‐temperature covariance using AIRS 

      Gambacorta, A.; Barnet, C.; Soden, B.; Strow, L. (American Geophysical Union, 2008-05-29)
      We investigate the horizontal and vertical structure of the covariance between water vapor and temperature in the tropical troposphere, using satellite measurements from the Atmospheric InfraRed Sounder (AIRS). Our analysis ...

    • Assimilation of lidar back-scatter and wind retrievals of planetary boundary layer height into WRF atmospheric forecast states 

      Tangborn, Andrew; Demoz, Belay; Carroll, Brian J.; Santanello, Joseph A.; Anderson, Jeffrey L. (Copernicus Publications, 2020-04-29)
      Lidar backscatter and wind retrievals of the planetary boundary layer height (PBLH) are assimilated into forecasts from the NASA Unified - Weather and Research Forecast (NU-WRF) model during the Plains Elevated Convection ...

    • Assimilation of lidar planetary boundary layer height observations 

      Tangborn, Andrew; Demoz, Belay; Carroll, Brian J.; Santanello, Joseph; Anderson, Jeffrey L. (EGU Publications, 2020-07-07)
      Lidar backscatter and wind retrievals of the planetary boundary layer height (PBLH) are assimilated into 22 hourly forecasts from the NASA Unified – Weather and Research Forecast (NU-WRF) model during the Plains Elevated ...

    • AST/RO Observations of Atomic Carbon near the Galactic Center 

      Ojha, Roopesh; Stark, Antony A.; Hsieh, Henry H.; Lane, Adair P.; Chamberlin, Richard A.; Bania, Thomas M.; Bolatto, Alberto D.; Jackson, James M.; Wright, Gregory A. (IOP, 2001-02-10)
      We present a coarsely sampled map of the region |l| ≤ 2°, |b| ≤ 0°1 in the 492 GHz (³P₁ → ³P₀) fine-structure transition of neutral carbon, observed with the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO). ...

    • Astrometry of 25 Southern Hemisphere Radio Sources from a VLBI Short-Baseline Survey 

      Fey, Alan L.; Ojha, Roopesh; Reynolds, John E.; Ellingsen, Simon P.; McCulloch, Peter M.; Jauncey, David L.; Johnston, Kenneth J. (IOP, 2004-11)
      Milliarcsecond-accurate radio positions for 25 southern hemisphere extragalactic sources are reported. These positions are derived from Mark III Very Long Baseline Interferometry observations made between 2003 September ...

    • ATCA monitoring of gamma-ray loud AGN 

      Stevens, J.; Edwards, P. G.; Ojha, R.; Kadler, M.; Hungwe, F.; Dutka, M.; Tingay, S.; Macquart, J. P.; Moin, A.; Lovell, J.; Blanchard, J. (2012-11-12)
      As a critical part of the Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry (TANAMI) program, in November 2007 the Australia Telescope Compact Array (ATCA) started monitoring the radio spectra of ...

    • ATCA Observations of the New Gamma-ray Source PKS 1824-582 

      Edwards, Philip G.; Stevens, Jamie; Ojha, Roopesh (2014-04-17)

    • Atmospheric Acetaldehyde: Importance of Air‐Sea Exchange and a Missing Source in the Remote Troposphere 

      Wang, Siyuan; Hornbrook, Rebecca S.; Hills, Alan; Emmons, Louisa K.; Tilmes, Simone; Lamarque, Jean‐François; Jimenez, Jose L.; Campuzano‐Jost, Pedro; Nault, Benjamin A.; Crounse, John D.; Wennberg, Paul O.; Kim, Michelle; Allen, Hannah; Ryerson, Thomas B.; Thompson, Chelsea R.; Peischl, Jeff; Moore, Fred; Nance, David; Hall, Brad; Elkins, James; Tanner, David; Huey, L. Gregory; Hall, Samuel R.; Ullmann, Kirk; Orlando, John J.; Tyndall, Geoff S.; Flocke, Frank M.; Ray, Eric; Hanisco, Thomas F.; Wolfe, Glenn M.; Clair, Jason St.; Commane, Róisín; Daube, Bruce; Barletta, Barbara; Blake, Donald R.; Weinzierl, Bernadett; Dollner, Maximilian; Conley, Andrew; Vitt, Francis; Wofsy, Steven C.; Riemer, Daniel D.; Apel, Eric C. (American Geophysical Union, 2019-05-28)
      We report airborne measurements of acetaldehyde (CH₃CHO) during the first and second deployments of the National Aeronautics and Space Administration Atmospheric Tomography Mission (ATom). The budget of CH₃CHO is examined ...

    • Atmospheric Correction of Satellite Ocean-Color Imagery During the PACE Era 

      Frouin, Robert J.; Franz, Bryan A.; Ibrahim, Amir; Knobelspiesse, Kirk D.; Ahmad, Ziauddin; Cairns, Brian; Chowdhary, Jacek; Dierssen, Heidi M.; Tan, Jing; Dubovik, Oleg; Huang, Xin; Davis, Anthony B.; Kalashnikova, Olga; Thompson, David R.; Remer, Lorraine Ann; Boss, Emmanuel; Coddington, Odele; Deschamps, Pierre-Yves; Gao, Bo-Cai; Gross, Lydwine; Hasekamp, Otto; Omar, Ali; Pelletier, Bruno; Ramon, Didier; Steinmetz, François; Zhai, Peng-wang (Frontiers, 2019-07-26)
      The Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission will carry into space the Ocean Color Instrument (OCI), a spectrometer measuring at 5 nm spectral resolution in the ultraviolet (UV) to near infrared (NIR) with ...

    • Atmospheric Refraction at Optical Wavelengths: Problems and Solutions 

      Mendes, V. B.; Pavlis, E.C. (NASA, 2002-10)
      Atmospheric refraction is an important accuracy-limiting factor in the application of satellite laser ranging (SLR) to high-accuracy applications. The modeling of that source of error in the analysis of SLR data comprises ...

    • Atomic oxygen reactions with semifluorinated and n-alkanethiolate self-assembled monolayers 

      Wagner, A. J.; Wolfe, G. M.; Fairbrother, D. H. (AIP publishing, 2004-02-20)
      The interaction of atomic oxygen (O(³P)) with semifluorinated self-assembled monolayers (CF-SAMs), two different n-alkanethiolate self-assembled monolayers, and a carbonaceous overlayer derived from an x-ray modified ...

    • AuScope Simulations for 3rd SLR Site in Australia 

      Pavlis, Erricos C.; MacMillan, Dan; Altamimi, Zuheir (International Earth Rotation and Reference Systems Service, 2007-04-16)

    • AXIS Advanced X-ray Imaging Satellite 

      Mushotzky, Richard F.; Aird, James; Barger, Amy J.; Cappelluti, Nico; Chartas, George; Corrales, Lia; Eufrasio, Rafael; Fabian, Andrew C.; Falcone, Abraham D.; Gallo, Elena; Gilli, Roberto; Grant, Catherine E.; Hardcastle, Martin; Hodges-Kluck, Edmund; Kara, Erin; Koss, Michael; Li, Hui; Lisse, Carey M.; Loewenstein, Michael; Markevitch, Maxim; Meyer, Eileen T.; Miller, Eric D.; Mulchaey, John; Petre, Robert; Ptak, Andrew J.; Reynolds, Christopher S.; Russell, Helen R.; Safi-Harb, Samar; Smith, Randall K.; Snios, Bradford; Tombesi, Francesco; Valencic, Lynne; Walker, Stephen A.; Williams, Brian J.; Winter, Lisa M.; Yamaguchi, Hiroya; Zhang, William W. (2019-03-11)
      Much of the baryonic matter in the Universe, including the most active and luminous sources, are best studied in the X-ray band. Key advances in X-ray optics and detectors have paved the way for the Advanced X-ray Imaging ...

    • Bell's Inequality Tests and Quantum Communication with Entangled Photon Holes 

      Pittman, T.B.; Franson, J.D. (OSA Publishing, 2007-06)
      We report on experimental work towards the realization of quantum communication with entangled photon holes. These experiments involve two-photon interferometry and photon hole states generated through quantum interference ...

    • Benchmarking parallel implementations of cloud type clustering from satellite data 

      Barajas, Carlos A.; Mukherjee, Lipi; Guo, Pei; Hoban, Susan; Jin, Daeho; Gangopadhyay, Aryya; Wang, Jianwu
      The study of clouds, i.e., where they occur and what are their characteristics, plays a key role in the understanding of climate change. The aim of this project is to use machine learning in conjunction with parallel ...

    • Benchmarking Parallel K-Means Cloud Type Clustering from Satellite Data 

      Barajas, Carlos; Guo, Pei; Mukherjee, Lipi; Hoban, Susan; Wang, Jianwu; Jin, Daeho; Gangopadhyay, Aryya; Gobbert, Matthias K. (Springer, Cham, 2019-10-08)
      The study of clouds, i.e., where they occur and what are their characteristics, plays a key role in the understanding of climate change. Clustering is a common machine learning technique used in atmospheric science to ...

    • Blazar Sheath Illumination of the Outer Molecular Torus: A Resolution of the Seed Photon Problem for the Far-GeV Blazar Flares 

      Breiding, Peter; Georganopoulos, Markos; Meyer, Eileen T. (IOP, 2018-01-18)
      Recent multiwavelength work led by the Boston University blazar group (e.g., Marscher et al.) strongly suggests that a fraction of the blazar flares seen by the Fermi Large Area Telescope (LAT) take place a few to several ...