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  • MODIS
  • Newer radiometers such as the Multi-angle Imaging Spectroadiometer (MISR) and the Moderate Resolution Imaging Spectroradiomer (MODIS) are capable of viewing aerosols at many more angles and wavelengths, providing more accurate results. (nasa.gov)
  • Our previous POMINO algorithm explicitly accounts for aerosol effects to improve the retrieval, especially in polluted situations over China, by using aerosol information from GEOS-Chem simulations with further monthly constraints by MODIS/Aqua aerosol optical depth (AOD) data. (atmos-meas-tech.net)
  • The MODIS Dark Target (DT) aerosol algorithm, developed for global applications, significantly underestimated regional aerosol optical depth (AOD) during this episode. (atmos-chem-phys.net)
  • Thus, using this new less-absorbing aerosol model, cloud masking based on results of the MODIS cloud optical properties algorithm, and relaxed thresholds on both inland water tests and upper limits of the AOD retrieval, we created a research algorithm and applied it to 80 appropriate MODIS granules during the event. (atmos-chem-phys.net)
  • This amount of missing AOD can skew the perception of the severity of the event, affect estimates of regional aerosol forcing, and alter aerosol modeling and forecasting that assimilate MODIS aerosol data products. (atmos-chem-phys.net)
  • measurements
  • We will present initial results on Cn2 and aerosol variability in the coastal zone using simultaneous measurements from a Twin Otter research aircraft, two instrumented ocean vessels [R/V John Martin and a rigid hull inflatable boat (RHIB)] , and a coastal land site. (spie.org)
  • Aerosol measurements from a remote sensing perspective and the advances that have been made in this regard are enlisted. (springer.com)
  • The future requirements in terms of measurements, remote sensing techniques, and modeling studies for better detection and attribution of climate change due to aerosols is envisioned. (springer.com)
  • Although it became clear about 40 years ago that aerosols could affect climate, the measurements needed to establish the magnitude of such effects-or even whether specific aerosol types warm or cool the surface-were lacking. (nasa.gov)
  • The first satellite instrument capable of crudely monitoring aerosol optical depth from space-the Advanced Very High Resolution Radiometer (AVHRR)-retrieved optical depth from measurements in the visible and near-infrared spectrum, beginning in the late 1970s. (nasa.gov)
  • The team of researchers will take daily measurements of trace gases and aerosols the city emits (known as the Sacramento urban plume) under relatively well defined and regular weather conditions. (enn.com)
  • NASA
  • While other NASA instruments - including ground, aircraft, and satellite-based instruments - have studied aerosols in the past, APS is NASA's first satellite-based instrument capable of measuring the polarization, the orientation of light-wave vibrations. (northdenvernews.com)
  • solar radiation
  • White sheets of sea ice, for example, reflect a great deal of radiation, whereas darker surfaces, such as the ocean, tend to absorb solar radiation and have a net warming effect. (nasa.gov)
  • 1991
  • In 1991, the eruption of Mount Pinatubo in the Philippines ejected more than 20 million tons of sulfur dioxide-a gas that reacts with other substances to produce sulfate aerosol-as high as 60 kilometers (37 miles) above the surface, creating particles in the stratosphere. (nasa.gov)
  • A recent example is the eruption of Mount Pinatubo in 1991, whose production of sulphate aerosols pushed down global average temperatures for as long as two to three years. (axa-research.org)
  • CALIPSO
  • Here we present a major algorithm update, POMINO v1.1, by constructing a monthly climatological dataset of aerosol extinction profiles, based on level 2 CALIOP/CALIPSO data over 2007-2015, to better constrain the modeled aerosol vertical profiles. (atmos-meas-tech.net)
  • MISR
  • Diner DJ et al (2001) MISR aerosol optical depth retrievals over southern Africa during the SAFARI-2000 winter season campaign. (springer.com)
  • This map shows the average distribution of aerosols from June 2000 through May 2010, measured by the Multi-angle Imaging Spectroradiometer (MISR). (nasa.gov)
  • conclude
  • We conclude that the specific representation of aerosols in global climate models, including aerosol mixing state, has important implications for climate modelling. (atmos-chem-phys.net)
  • Recent studies of the Sahel drought and major increases since 1967 in rainfall over the Northern Territory, Kimberley, Pilbara and around the Nullarbor Plain have led some scientists to conclude that the aerosol haze over South and East Asia has been steadily shifting tropical rainfall in both hemispheres southward. (enn.com)
  • properties
  • However, since aerosols comprise such a broad collection of particles with different properties, the overall effect is anything but simple. (nasa.gov)
  • Depending on their composition and other properties, aerosols can scatter or absorb the sun's heat, and can thus both warm and cool the planet depending on the circumstances. (nasa.gov)
  • Aircraft and other ground stations deploy in situ instruments that measure certain aerosol properties with greater accuracy, but less frequently. (nasa.gov)
  • wildfires
  • In the Arctic especially, aerosols from wildfires and industrial pollution are likely hastening the melting of ice. (nasa.gov)
  • CALIOP
  • Improved aerosol correction for OMI tropospheric NO 2 retrieval over East Asia: constraint from CALIOP aerosol vertical profile OMI tropospheric NO 2 retrieval over East Asia Mengyao Liu et al. (atmos-meas-tech.net)
  • We find that GEOS-Chem captures the month-to-month variation in CALIOP aerosol layer height (ALH) but with a systematic underestimate by about 300-600 m (season and location dependent), due to a too strong negative vertical gradient of extinction above 1 km. (atmos-meas-tech.net)
  • observations
  • There is still considerable ambiguity about the dominant types of aerosol in satellite observations and the amount of observed aerosol that can be attributed to human activities," he said. (nasa.gov)
  • dust
  • It is shown that typical dust scenarios such as those seen by the MER long-term monitorization of ground-based aerosol optical depth, τ≈0.45 and 0.9, produce UV nadir viewing reflectance values of the order of 0.02 and 0.04, respectively, which are comparable with those actually measured by Mars Express. (csic.es)
  • By more accurately identifying a broad suite of aerosol types - such as salt, mineral dust and smoke - the instrument should help climatologists fill in key gaps in climate models. (northdenvernews.com)
  • extinction profiles
  • Model results of aerosol optical depths (AODs) and extinction profiles are analyzed and compared to satellite retrievals and two ground-based lidars located in northern India. (osti.gov)
  • Doubling the calculated aerosol extinctions below 850 hPa generates much better agreement with the observed AOD and extinction profiles averaged over South Asia. (osti.gov)
  • optical depth
  • An optical depth of less than 0.05 indicates a clear sky with relatively few aerosols and maximum visibility, whereas a value of 1 indicates hazy conditions. (nasa.gov)
  • Aerosol optical depth is the fundamental measurement of quantity and distribution of aerosols. (nasa.gov)
  • Sensor
  • Despite its small size, Glory will deploy an innovative aerosol-sensing instrument called the Aerosol Polarimetry Sensor (APS) that many specialists predict will produce dramatic improvements in measuring airborne particles, as well as an important sensor that will help maintain a 32-year record of the sun's irradiance. (nasa.gov)
  • An instrument even more sensitive to the polarization of light, the Aerosol Polarimetery Sensor (APS), will gather additional insights after its launch aboard NASA's Glory mission in 2011. (nasa.gov)
  • Glory, which contains an innovative aerosol-sensing instrument called the Aerosol Polarimetry Sensor (APS), aims to change this. (northdenvernews.com)
  • global
  • The Global Hawk Uninhabited Aerial Vehicle (bottom) can carry several instruments to measure aerosols from the air. (nasa.gov)