Summaries, photographs, and abstracts about the current projects of our researchers.
Our researchers are currently doing work in many exciting fields. In addition to the summaries, photographs, and abstracts listed here, relevant information can also be found in Publications & Presentations, JPL-Supported Research, and Extramural Projects.
SEPARATING REFLECTIVE CLOUD LAYERS
Separating Reflective Layers of Clouds in Earth Remote Sensing Images
Researchers: Igor Yanovsky and Anthony Davis
We introduce a methodology for separating reflective layers of clouds in Earth remote sensing images. We propose a single-channel layer separation framework and extend it to multispectral layer separation. Efficient alternating minimization and fast operator-splitting methods are used to solve minimization problems. Read More...
DECONVOLUTION AND SUPER-RESOLUTION TECHNIQUES
Sparse Optimization-based Deconvolution and Super-Resolution Methods for Microwave Imagery
Researchers: Igor Yanovsky, Bjorn Lambrigtsen, Alan Tanner, Luminita Vese
We develop efficient deconvolution and super-resolution methodologies and apply these techniques to reduce image blurring and distortion inherent in an aperture synthesis system. Such a system produces ringing at sharp edges and other transitions in the observed field. The conventional approach to suppressing sidelobes is to apply linear apodization, which has the undesirable side effect of degrading spatial resolution. Read More...
UV-VIS RADIATIVE TRANSFER MODELING
Air quality remains one of the major environmental challenges in the Los Angeles Basin and many other urban areas in the world. Despite an extensive ground monitoring network, there remains a lack of information on the temporal and spatial distribution of pollutants and greenhouse gases, in particular at elevated altitudes. Consequently our understanding of emissions and chemical processing remains limited . Read More...
VARIATION OF DUST DEPOSITION TO THE SNOW AND VEGETATION DYNAMICS
The deposition of desert dust to mountain snow directly impacts the hydrologic cycle and water resource management through the depression of snow albedo and acceleration of snowmelt. However, the key processes that control the variation of dust deposition to snow are poorly understood. In this research, we compared a remotely sensed estimate of bare soil exposure from MODIS reflectance data for the period of 2002 to 2011, with dust loading at downwind mountain sites in the Western United States. Read More...
ATMOSPHERIC COMPOSITION AND AIR QUALITY SCIENCE
Atmospheric Composition and Air Quality Science using data from the European METOP infrared atmopsheric sounding interferometer (IASI) (7/2013)
Researchers: Hilke Oetjen, Annmarie Eldering et al.
Ozone (O3) is the third most important anthropogenic greenhouse gas and a significant pollutant at the surface affecting human and plant health. Rapidly increasing Asian emissions of ozone precursors, land-surface changes from burning, and decreasing surface emissions in Europe and North America have resulted in unknown changes to the distribution of tropospheric ozone. The goal of this project is to create a long-term record of tropospheric ozone using Infrared Atmospheric Sounding Interferometer (IASI, launch in 2006, 2012, and 2016/17) satellite measurements Read More...
ANTARCTIC SEA ICE
Scatterometer Algorithm Development for Antarctic Sea Ice Mapping (2/2013)
Researcher: Son V. Nghiem
Son V. Nghiem has been developing, adapting, and testing algorithms to detect and monitor Antarctic sea ice using scatterometer data. The objective of this research is to use QuikSCAT and Oceansat-2 scatterometer backscatter measurements to develop advanced algorithms to classify and map the Antarctic sea ice cover. While Arctic sea ice has been reduced drastically, Antarctic sea ice has increased. Read More...
GPS RADIO OCCULTATION OF ATMOSPHERIC BOUNDARY LAYER
The shallow atmospheric boundary layer (ABL) over the southeast (SE) Pacific Ocean is featured with a strong temperature inversion and a sharp moisture gradient across the ABL top, which is notoriously difficult to simulate in weather and climate models and is extremely challenge to measure from the space. The strong moisture and temperature gradients result in a sharp refractivity gradient that can be precisely detected by the high vertical resolution Global Positioning System (GPS) radio occultation (RO) bending angle and refractivity measurements. Read More...
CLIMATE VARIABILITY OF TROPICAL ATMOSPHERE
During boreal summer, convective activity over the eastern Pacific (EPAC) inter-tropical convergence zone (ITCZ) exhibits vigorous intraseasonal variability (ISV), which exerts significant influences on regional weather and climate systems, including N. American monsoon as well as tropical cyclone activity over both EPAC and Gulf and Mexico. Read More...
Vertical Diabatic Heating Structures of the Madden-Julian Oscillation and Convectively-Couples Equatorial Waves (CCEWs)
Researchers: Xianan Jiang & Duane Waliser
As a dominant subseasonal mode of tropical atmospheric variability, the Madden-Julian Oscillation (MJO) exerts pronounced influences on global climate and weather systems , and represents primary sources of predictability on subseasonal time scales. Current general circulation models (GCMs), however, exhibit limited capability in representing this prominent tropical variability mode. Read More...