A5048198025- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Solar Radiation and Photovoltaics
- Infrared Target Detection Methodologies
- Meteorological Phenomena and Simulations
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Distributed and Parallel Computing Systems
- Remote Sensing in Agriculture
- Climate variability and models
- Geochemistry and Geologic Mapping
- Radiative Heat Transfer Studies
- Urban Heat Island Mitigation
- Ionosphere and magnetosphere dynamics
- Advanced Image Fusion Techniques
- Hydrocarbon exploration and reservoir analysis
- Satellite Image Processing and Photogrammetry
- Advanced Aircraft Design and Technologies
- Spacecraft Design and Technology
- Impact of Light on Environment and Health
- Air Traffic Management and Optimization
- Precipitation Measurement and Analysis
Langley Research Center
2015-2024
National Aeronautics and Space Administration
2018-2020
Naval Research Laboratory Information Technology Division
2016
Analytical Services & Materials (United States)
1998-2007
Science Systems and Applications (United States)
2007
Science Applications International Corporation (United States)
2002
Abstract Despite recent improvements in satellite instrument calibration and the algorithms used to determine reflected solar (SW) emitted thermal (LW) top-of-atmosphere (TOA) radiative fluxes, a sizeable imbalance persists average global net radiation at TOA from observations. This is problematic applications that use earth budget (ERB) data for climate model evaluation, estimate earth’s annual mean energy budget, studies infer meridional heat transports. study provides detailed error...
The Clouds and the Earth’s Radiant Energy System (CERES) Balanced Filled (EBAF) top-of-atmosphere (TOA), Edition 4.0 (Ed4.0), data product is described. EBAF Ed4.0 an update to Ed2.8, incorporating all of suite CERES algorithm improvements consistent input datasets throughout record. A one-time adjustment shortwave (SW) longwave (LW) TOA fluxes made ensure that global mean net flux for July 2005–June 2015 with in situ value 0.71 W m −2 . While all-sky differences between Ed2.8 are within 0.5...
Abstract The algorithm to produce the Clouds and Earth’s Radiant Energy System (CERES) Edition 4.0 (Ed4) Balanced Filled (EBAF)-surface data product is explained. forces computed top-of-atmosphere (TOA) irradiances match with Ed4 EBAF-TOA by adjusting surface, cloud, atmospheric properties. Surface are subsequently adjusted using radiative kernels. adjustment process composed of two parts: bias correction Lagrange multiplier. in temperature specific humidity between 200 500 hPa used for...
Abstract The Clouds and the Earth’s Radiant Energy System (CERES) instruments on board Terra Aqua spacecraft continue to provide an unprecedented global climate record of earth’s top-of-atmosphere (TOA) energy budget since March 2000. A critical step in determining accurate daily averaged flux involves estimating between CERES or overpass times. employs CERES-only (CO) geostationary (CG) temporal interpolation methods. CO method assumes that cloud properties at time observation remain...
Abstract The estimate of surface irradiance on a global scale is possible through radiative transfer calculations using satellite-retrieved surface, cloud, and aerosol properties as input. Computed top-of-atmosphere (TOA) irradiances, however, do not necessarily agree with observation-based values, for example, from the Clouds Earth’s Radiant Energy System (CERES). This paper presents method to determine irradiances observational constraints TOA CERES. A Lagrange multiplier procedure used...
Radiative flux anomalies derived from the National Aeronautics and Space Administration (NASA) spaceborne Earth Radiation Budget Experiment were used to determine volcanic radiative forcing that followed eruption of Mount Pinatubo in June 1991. They are first unambiguous, direct measurements large-scale forcing. The aerosols caused a strong cooling effect immediately; amount increased through September 1991 as shortwave relative longwave primary effects increase albedo over mostly clear...
Abstract The Clouds and the Earth’s Radiant Energy System Synoptic (SYN1deg), edition 3, product provides climate-quality global 3-hourly 1° × 1°gridded top of atmosphere, in-atmosphere, surface radiant fluxes. in-atmosphere fluxes are computed hourly using a radiative transfer code based upon inputs from Terra Aqua Moderate Resolution Imaging Spectroradiometer (MODIS), geostationary (GEO) data, meteorological assimilation data Goddard Earth Observing System. GEO visible infrared imager...
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission will provide a calibration laboratory in orbit for the purpose of accurately measuring attributing climate change. CLARREO measurements establish new change benchmarks with high absolute radiometric accuracy statistical confidence across wide range essential variables. CLARREO's inherently be verified traceable on to Système Internationale (SI) units. established by critical assessing changes Earth system model...
Abstract The Clouds and the Earth’s Radiant Energy System (CERES) project has provided climate community 15 years of globally observed top-of-the-atmosphere fluxes critical for cloud feedback studies. To accurately monitor earth’s radiation budget, CERES instrument footprint must be spatially temporally averaged properly. synoptic 1° (SYN1deg) product incorporates derived from geostationary satellites (GEOs) to account regional diurnal flux variations in between Terra Aqua measurements....
Abstract Errors in top-of-atmosphere (TOA) radiative fluxes from the Clouds and Earth’s Radiant Energy System (CERES) instrument due to uncertainties radiance-to-flux conversion CERES Terra angular distribution models (ADMs) are evaluated through a series of consistency tests. These tests show that overall bias regional monthly mean shortwave (SW) TOA flux is less than 0.2 W m−2 RMS error ranges 0.70 1.4 m−2. In contrast, SW inferred using theoretical ADMs assume clouds plane parallel...
Abstract. A parametric study of the instantaneous radiative impact contrails is presented using three different transfer models for a series model atmospheres and cloud parameters. Contrails are treated as geometrically optically thin plane parallel homogeneous cirrus layers in static atmosphere. The ice water content varied function ambient temperature. include tropical, mid-latitude, subarctic summer winter atmospheres. Optically cause positive net forcing at top At surface negative during...
Objective techniques have been developed to consistently identify cloudy pixels over nonpolar regions in multispectral imager data coincident with measurements taken by the Clouds and Earth's Radiant Energy System (CERES) on Tropical Rainfall Measuring Mission (TRMM), Terra, Aqua satellites. The daytime method uses 0.65-, 3.8-, 10.8-, 12.0-mum channels TRMM Visible Infrared Scanner (VIRS) Terra MODIS. VIRS 1.6-mum channel 1.38- 2.1-mum are used secondarily. primary nighttime radiances from...
To monitor land surface processes over a wide range of temporal and spatial scales, it is critical to have coordinated observations the Earth's acquired from multiple spaceborne imaging sensors. However, an integrated global observation framework requires understanding how are seen differently by various This particularly true for sensors acquiring data in spectral bands whose relative responses (RSRs) not similar thus may produce different results while observing same target. The intrinsic...
A set of cloud retrieval algorithms developed for CERES and applied to MODIS data have been adapted analyze other satellite imager in near-real time. The products, including single-layer amount, top base height, optical depth, phase, effective particle size, liquid ice water paths, are being retrieved from GOES- 10/11/12, MTSAT-1R, FY-2C, Meteosat as well MODIS. comprehensive system normalize the calibrations has implemented maximize consistency products across platforms. Estimates surface...
The Global Space-based Inter-Calibration System (GSICS) is a new international program to assure the comparability of satellite measurements taken at different times and locations by instruments operated agencies. Sponsored World Meteorological Organization Coordination Group for Satellites, GSICS will intercalibrate constellation operational low-earth-orbiting (LEO) geostationary earth-orbiting (GEO) environmental satellites tie these common reference standards. intercomparability...
This paper highlights how the emerging record of satellite observations from Earth Observation System (EOS) and A-Train constellation are advancing our ability to more completely document understand underlying processes associated with variations in Earth's top-of-atmosphere (TOA) radiation budget. Large-scale TOA changes during past decade observed be within 0.5 Wm−2 per based upon comparisons between Clouds Radiant Energy (CERES) instruments aboard Terra Aqua other instruments. Tropical...
Deep convective clouds (DCCs) are ideal visible calibration targets because they bright nearly isotropic solar reflectors located over the tropics and can be easily identified using a simple infrared threshold. Because all satellites view DCCs, DCCs provide opportunity to uniformly monitor stability of operational sensors, both historical present. A collective DCC anisotropically corrected radiance approach is used construct monthly probability distribution functions (PDFs) sensor stability....
Abstract Understanding how marine low clouds and their radiative effects respond to changing meteorological conditions is crucial constrain low-cloud feedbacks greenhouse warming internal climate variability. In this study, we use observations quantify the response perturbations over global oceans shed light on physical processes governing planetary radiation budget variability in different regimes. We assess independent effect of sea surface temperature, estimated inversion strength,...
Monitoring and adjusting calibrations of various satellite imagers is often exacerbated by differences in their spectral response functions (SRFs). To help account for disparities among imagers, a web-based band difference correction calculator has been developed to characterize the relationship between specified pair imager channels hyperspectral wavelength range 240-1750 nm. These adjustment factors (SBAFs) are derived convolving data from SCIAMACHY instrument with SRFs reference target...
Abstract The Clouds and the Earth’s Radiant Energy System (CERES) project has provided climate community 20 years of globally observed top atmosphere (TOA) fluxes critical for cloud feedback studies. CERES Flux By Cloud Type (FBCT) product contains radiative by type, which can provide more stringent constraints when validating models also reveal insight into interactions between clouds climate. FBCT provides 1° regional daily monthly shortwave (SW) longwave (LW) cloud-type properties sorted...
Accurate long-term sensor calibration and periodic re-processing to ensure consistency continuity of atmospheric, land ocean geophysical retrievals from space within the mission period across different missions is a major requirement climate data records. In this work, we applied Multi-Angle Implementation Atmospheric Correction (MAIAC)-based vicarious technique over Libya-4 desert site perform analysis Visible Infrared Imaging Radiometer Suite (VIIRS) on Suomi National Polar-orbiting...
The global distribution of radiative forcing by persistent linear contrails has been estimated for 1992 and 2050 using contrail cover computed aircraft fuel consumption scenarios the two periods, a detailed prescription properties Earth's surface cloudy atmosphere, flux computations with an established transfer model. mean line‐shaped is ∼0.02 Wm −2 in ∼0.1 2050. At northern mid‐latitudes, zonal five times larger than mean. Diffuse indirect effects emissions on natural cirrus are not...
The Moderate Resolution Imaging Spectroradiometer (MODIS) has successfully operated onboard the Terra spacecraft for more than 12 years and Aqua ten years. It 20 reflective solar bands covering visible (VIS), near infrared (NIR), short-wave (SWIR) spectral regions. They are calibrated on orbit using regularly scheduled diffuser measurements lunar observations. In recent years, observations over selected ground targets also used to monitor detector responses at different angles of incidence....
The latest CERES FM-5 instrument launched onboard the S-NPP spacecraft will use VIIRS visible radiances from NASA Land Product Evaluation and Analysis Tool Elements (PEATE) product for retrieving cloud properties associated with its TOA flux measurement. In order to provide climate quality datasets, retrieved must be consistent throughout record, which is dependent on calibration stability of imager. This paper assesses reflective solar bands using Libya-4 desert deep convective clouds...