Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 31 for “"Satellite retrievals"”.
-
Improving Our Understanding of Atmospheric Aerosols and Their Climate Effects: Implications for Satellite Retrievals and GCM Simulations
… of aerosols. They may also potentially impact satellite retrievals of aerosol properties as generally a constant SSA is assumed in the retrieval algorithms. In order to assess satellite retrieved aerosol optical properties, collocated pixel level Aerosol Optical Depth (AOD) and Ångström …
-
Reducing errors in simulated satellite views of clouds from large-scale models
… climate against available observations. Satellite retrievals of cloud properties provide an attractive baseline for this evaluation because they can provide near global coverage and long records. However, comparisons of modeled and satellite-retrieved cloud properties are difficult …
-
Cloud drop effective radius for trade wind cumuli observed during RICO by aircraft and MODIS
… about such clouds is relatively plentiful from satellites. But warm tropical clouds, such as those found in the trades, are often horizontally heterogeneous over the pixel scales of meteorological satellite imagers; the clouds may even be sub-pixel in size. Due to the 1-D nature of the radiative …
-
Determining The Effectiveness Of Satellite Remote Sensing Products To Quantify Aerosol Pollution In The Semi-Arid Western U.S.
… diameter smaller than 2.5 μm) concentrations. Satellite-derived PM2.5 estimates are relevant to improve the spatial resolution of air pollution concentration estimates due to the sparse number of PM2.5 monitoring stations. PM2.5 concentrations have been successfully estimated from Moderate …
-
Arctic Cloud, Radiation and their Interactions with Sea Ice
… in five global reanalysis products using NASA satellite retrievals and conclude that all five reanalysis products estimate radiative fluxes better than cloud properties, and MERRA-2 and JRA-55 have relatively better performance on the representation of Arctic cloud and radiation properties. …
-
ASSESSING PERFORMANCE OF NCEP RAPID REFRESH MODEL TO PREDICT BOUNDARY LAYER PROPERTIES
… relative humidity can affect aerosol retrieval. Satellite retrievals of Relative Humidity are extremely complicated since they need to resolve 1km vertical resolution for temperature and water vapor. The AIRS hyperspectral sensor may be able to retrieve relative humidity with 20% RMSE but low …
-
Development of a multispectral albedometer and deployment on an unmanned aircraft for evaluating satellite retrieved surface reflectance over Nevada's Black Rock Desert
… atmospheric aerosol characteristics derived from satellite measurements areneeded over a variety of land surfaces. Inhomogeneous and bright surface reflectanceacross California and Nevada may be a contributing factor in the discrepancies observedbetween ground based and satellite-retrieved …
-
Bridging the gap : comparative analysis of a gap filling X-band radar QPE algorithms and their implications for nowcasting and hydrological modeling
… X-band and S-band radars with Integrated Multi-satellitE Retrievals for GPM (IMERG) showed comparable performances within 80km, with both radars surpassing IMERG estimations. However, the X-band's efficacy decreased with range. To address this, the "dynamic distance algorithm" was introduced for …
-
Integrative Analysis of Policy Changes for a Coastal Watershed: Implications for Agriculture and Ecosystem Health
… chapter assesses the effectiveness of various satellite precipitation products and autocalibration techniques on river flow prediction, highlighting the superior performance of the Global Precipitation Measurement Integrated Multi-satellitE Retrievals (GPM IMERG) dataset when combined with the …
-
Advancing the Accuracy of Watershed Analysis Across Diverse Hydrometeorological and Geologic Regimes via Classification and Analysis of GPM-IMERG Products
… spring hydrographs with high-resolution, satellite-based Global Precipitation Measurement – Integrated Multi-satellitE Retrievals for GPM (GPM-IMERG) data, I improve the speed and accuracy of catchment identification and hydrodynamic characterization via an enhanced Empirically Constrained …
-
Atmospheric Pollutant Levels in Southeast Brazil During COVID-19 Lockdown: Combined Satellite and Ground-based Data Analysis
… going to be addressed using a combination of satellite and ground-based data analysis. We explored nitrogen dioxide (NO2) and particulate matter (PM2.5) daily levels for the month of May during different years within 2015-2020. Daily measurements of NO2 column concentrations from the Ozone …
-
Air Pollutant Concentrations and Trends over the Eastern U.S. and China: Aircraft Measurements and Numerical Simulations
… I successfully validated the SO2 columns with satellite retrievals, and proved that the new OMI SO2 algorithm performs better than the conventional algorithm. An emission inventory was evaluated through a combination of model simulations and satellite products. Between 2006 and 2008, the SO2 …
-
INVESTIGATION OF TRACER GAS VARIABILITY FROM OBSERVATIONS AND MODELS
… was investigated utilizing in-situ measurements, satellite retrievals, and model simulations. In the tropical region, using Atmospheric Infrared Sounder (AIRS) mid-tropospheric CO2 retrievals led to the discovery of a signal with a periodicity of around two years, which was found to be related to …
-
Temporal variability of fluorescent dissolved organic matter at a brackish, tidal marsh-estuary interface
… and advances in coastal DOC remote sensing satellite retrievals. In addition to carbon analysis, we were able to analyze particulate and physicochemical exchanges at the marsh-estuary interface between low and high tide water, and spatially within the Rhode River sub-estuary using two end …
-
Machine learning and remote sensing in the physical sciences : applications in Earth surface and atmospheric modeling.
… onto NASA Soil Moisture Active Passive (SMAP) SM retrievals from January 1, 2016 – January 1, 2019. The best-performing model predicted SM with a mean error of 0.02 cm3 cm–3 with respect to SMAP SM retrievals. Part 2 analyzed aerosol-cloud interactions (ACIs) using NASA satellite retrievals and …
-
Validation, Analysis of Annual Cycle, and Biogenic Sequestration of CO2, and Modulation of CH4
… warming and climate change. Retrieved CO2 from satellites (e.g., OCO 2, GOSAT, AIRS, TES) offer a fresh opportunity to understand the variability of CO2 over the global domain that was unattainable before due to sparse in situ measurements. First, two innovative satellite data sets, Orbiting …
-
Spatial pattern of African Easterly Waves and their Precipitation in Northern Africa
… Waves Climatology and the Integrated Multi-satellite Retrievals for Global Precipitation Measurement (IMERG). First, a spatial filter is used to limit 2001-2021 tropical easterly waves to only waves over the northern Africa region. The resulting AEWs are then split into categories based on …
-
The vertical structure of stratospheric planetary waves and its variability : theory and observations
… obvious, given the low vertical resolution of satellite retrievals. The goal of this thesis is to understand the sources of observed variability of vertical wave structure, in particular, to determine whether linear wave theory can explain this variability, and whether the observations are …
-
Quantifying various thunderstorm characteristics during high impact events using radar and satellite observations
… including their changes, using radar and satellite observations. Using an object-based technique, I compare the Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (IMERG) and ground radar based Multi-Radar Multi-Sensor Quantitative Precipitation Estimates (MRMS) …
-
Unraveling atmospheric physics and chemistry of long-range transport of pollutants: Development of novel tools and methods
… downwind region. In this study, we assimilated satellite retrievals (i.e., column NO2, formaldehyde, and Aerosol Optical Depth) and meteorological variables to constrain model results to achieve the best possible simulation. We observed the formation and dissipation of O3 plumes (~ 80-90 ppb) …
Page 1 of 2