Modis scatter and absorb aerosols. Medical search. Frequent questions

In 2002, NASA scientists and visualizers stitched together strips of brand new data, in natural color, collected over four months from the Moderate Resolution Imaging Spectroradiometer, or MODIS, instrument aboard Terra. (nasa.gov)
The biggest changes affect the "1.X" (1.0, 1.1, 1.2) models, which are based on a modified Kasten clear-sky model that incorporates atmospheric aerosol and water vapor values from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) instruments. (vaisala.com)
This natural-color image was acquired on July 19 by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite. (nasa.gov)
Moderate Resolution Imaging Spectroradiometer (MODIS) data are available through LANCE generally within 60 to 125 minutes after a satellite observation. (nasa.gov)
Moderate Resolution Imaging Spectroradiometer (MODIS) Corrected Reflectance Imagery is produced in near real-time (NRT) to provide natural looking images. (nasa.gov)
DCCs are identified in terms of the Moderate Resolution Imaging Spectroradiometer (MODIS) 10.8- μ m brightness temperature (TB 11 ) on the basis of a criterion specified by TB 11 ≤ 190 K. To determine the characteristics of these clouds, the MODIS-based cloud optical thickness (COT) and effective radius ( r e ) for a number of identified DCCs are analyzed. (ametsoc.org)
Cloud thermodynamic phase (ice, liquid, undetermined) classification is an important first step for cloud retrievals from passive sensors such as MODIS (Moderate-Resolution Imaging Spectroradiometer). (bvsalud.org)

Overall, single-scattering albedo of anthropogenic aerosols and the interaction of aerosols with the short-wave cloud radiative effects are found to be important factors. (copernicus.org)

Although aerosols are usually found in boundary layer beneath clouds, they can be elevated during long-range transport and rise above low-level clouds. (confex.com)
2013). For example, marine-boundary layer clouds in SE Atlantic region are persistently covered by light-absorbing smoke aerosols originating from biomass burning acativities in African Savanna during austral winter (July ~ September). (confex.com)
In contrast, when aerosols reside above clouds, their absorption effect can be significantly enhanced by cloud reflection, and offset or even exceed the scattering effect of the aerosol leading to a less negative or even positive (i.e., warming) DRE at TOA. (confex.com)
While it lacks some precision, it has the benefit of seeing aerosols over and around clouds. (nasa.gov)
The relative ASCAT wind field (black flow arrows in the same image) shows a sizeable wind convergence along the leading edge of the haze layer, giving rise to shallow convection and indicated by a string of small cumulus clouds well depicted by MODIS on Aqua (Figure 3). (eumetsat.int)
A second is the presence of clouds, which must be distinguished from aerosols, and block the view of aerosols and the surface below them. (databasefootball.com)
Atmospheric ionization produced by cosmic rays has been suspected to influence aerosols and clouds, but its actual importance has been questioned. (nature.com)
A link involving ionization, aerosols, and clouds would be an exciting interconnection between Earth and the Galaxy. (nature.com)
However, these results do not by themselves assure that aerosols survive to cloud condensation nuclei (CCN) such that variations in ionization can change CCN concentrations and subsequently clouds. (nature.com)
The goal of the AeroCom Radiative Transfer Code Experiment is to assess the solar radiative transfer schemes in AeroCom global models without aerosols or clouds given a prescribed surface albedo and standard atmospheres (AGFL tropical and sub arctic winter O3 and water vapor profiles). (met.no)
2004), The impact of humidity above stratiform clouds on indirect aerosol climate forcing , Nature, 432 , 1014-1017, doi:10.1038/nature03174. (nasa.gov)
The cycling of atmospheric aerosols through clouds can change their chemical and physical properties and thus modify how aerosols affect cloud microphysics and, subsequently, precipitation and climate. (uni-bielefeld.de)
Current knowledge about aerosol processing by clouds is rather limited to chemical reactions within water droplets in warm low-altitude clouds. (uni-bielefeld.de)
However, in cold high-altitude cirrus clouds and anvils of high convective clouds in the tropics and midlatitudes, humidified aerosols freeze to form ice, which upon exposure to subsaturation conditions with respect to ice can sublimate, leaving behind residual modified aerosols. (uni-bielefeld.de)
Using a combination of satellite and radiosonde data, we show that highly porous aerosol formation can readily occur in highly convective clouds, which are widespread in the tropics and midlatitudes. (uni-bielefeld.de)
Formation of highly porous aerosol particles by atmospheric freeze-drying in ice clouds", Proceedings of the National Academy of Sciences , vol. 110, 2013, pp. 20414-20419. (uni-bielefeld.de)
Anthropogenic Aerosol Indirect Effects in Cirrus Clouds. (uni-bielefeld.de)
Because ice and liquid phase clouds have very different scattering and absorbing properties, an incorrect cloud phase decision can lead to substantial errors in the cloud optical and microphysical property products such as cloud optical thickness or effective particle radius. (bvsalud.org)
For MODIS Collection 6 (C6), the shortwave-derived cloud thermodynamic phase algorithm used by the optical and microphysical property retrievals has been completely rewritten to improve the phase discrimination skill for a variety of cloudy scenes (e.g., thin/thick clouds, over ocean/land/desert/snow/ice surface, etc). (bvsalud.org)

But the data from satellite instruments can tell us even more - including how much carbon dioxide plants are absorbing from the atmosphere during photosynthesis. (nasa.gov)
The DRE of aerosols at the top of the atmosphere (TOA) is strongly dependent on the underlying surface. (confex.com)
These algorithms require information about the constituents of the atmosphere that scatter and absorb solar radiation. (vaisala.com)
All of these changes improve the representation of aerosols, which strongly affect the transmission of solar radiation through the atmosphere. (vaisala.com)
Case Study: How Do Carbon Monoxide and Aerosol Concentrations Affect Earth's Atmosphere? (carleton.edu)
In this chapter, you will explore the temporal and spatial patterns of aerosol and carbon monoxide concentrations in the atmosphere to discover and describe the interactions between them. (carleton.edu)
In 2010 it was estimated that human-made (anthropogenic) aerosols account for about 10 percent of the total mass of aerosols in the atmosphere. (knowpia.com)
Forty years ago, scientists began developing instruments that could monitor Earth's ozone layer by observing how the atmosphere scattered certain wavelengths of ultraviolet (UV) light. (nasa.gov)
The denser the aerosol level in the atmosphere, the darker the shade of orange. (nasa.gov)
While the word 'aerosol' conjures up images of spray cans, to atmospheric scientists the term refers to something different: small particles suspended in the atmosphere, often many times smaller than the width of a human hair. (databasefootball.com)
By scattering and absorbing light in the atmosphere, and interacting with cloud development they affect weather and climate. (databasefootball.com)
Algorithms have been developed using a variety of satellite instruments to use these measurements to quantify the amount and sometimes the type of aerosols in the atmosphere. (databasefootball.com)
Aerosols are small (sub-micron to several microns) suspended particles in the solid or liquid phase in the atmosphere. (sepehr.org)
2010), Improved algorithm for MODIS satellite retrievals of aerosol optical thickness over land in dusty atmosphere: Implications for air quality monitoring in China , Remote Sensing of Environment, 114 , 2575-2583, doi:10.1016/j.rse.2010.05.034. (nasa.gov)
A mechanism accelerating aerosol growth in the real atmosphere would lead to a higher survival rate of aerosols growing to CCN sizes. (nature.com)
New modelling approaches including models with fully coupled atmosphere, vegetation and soil matrices led to improved interpretations of the spectral and spatio-temporal variability of RS signals including those of atmospheric aerosols and water vapour. (copernicus.org)

A more dedicated focus on the contribution from the cloud-free and cloud-covered sky fraction, respectively, to the aerosol-radiation interaction will benefit the quantification of the radiative forcing and its uncertainty range. (copernicus.org)
New observations and related modelling studies of the aerosol-cloud-climate. (copernicus.org)
A fundamental question during the last two decades has been whether changes in atmospheric ionization can perturb aerosols and thereby cloud properties. (nature.com)
However, for the ion-aerosol-cloud link to be important, the changes in atmospheric ionization should significantly influence Earth's energy balance. (nature.com)
Using the Vector LInearized Discrete Ordinate Ra- Ozone Mapping and Profiler Suite (OMPS), and eventually diative Transfer (VLIDORT) code as the main driver for for- the Plankton, Aerosol, Cloud and ocean Ecosystem (PACE) ward model simulations, a first-of-its-kind data assimilation mission. (readkong.com)
2016). Variational and ensemble-based assim- passive-based aerosol optical depth (AOD) products over ilation of satellite-derived aerosol products such as aerosol cloud-free skies and dark surfaces. (readkong.com)
Nasa will be launching an advanced satellite mission in January 2024 called Pace (plankton, aerosol, cloud, ocean ecosystem) which will also measure hundreds of colours in the ocean instead of a handful, progressing studies like these further. (theindependentghana.com)
These observations may have implications for subsequent cloud formation cycles and aerosol albedo near cloud edges. (uni-bielefeld.de)
The MODIS Level-2 cloud product (Earth Science Data Set names MOD06 and MYD06 for Terra and Aqua MODIS, respectively) provides pixel-level retrievals of cloud-top properties (day and night pressure, temperature, and height) and cloud optical properties (optical thickness, effective particle radius, and water path for both liquid water and ice cloud thermodynamic phases-daytime only). (bvsalud.org)
While the emphasis is on the suite of cloud optical property datasets, other MODIS cloud datasets are discussed when relevant. (bvsalud.org)

2017), Article MODIS Retrieval of Aerosol Optical Depth over Turbid Coastal Water , www.mdpi.com/journal/remotesensing, 9 , 595, doi:10.3390/rs9060595. (nasa.gov)

We incorporated the new MODIS aerosol and water vapor products into our 1.X models and released new versions of the resulting data sets in November 2019. (vaisala.com)
This allows us to understand how each model treats Raleigh scattering, ozone absorption, and water vapor absorption. (met.no)

Aerosols can be natural or anthropogenic (the result of human activities), and include substances such as mineral dust (blown from deserts or bare soil by the wind), smoke (from wildfires as well as intentional burning), ash and sulphate from volcanic eruptions and degassing, sea spray, haze from industrial activities or vegetation emissions, and more. (databasefootball.com)
The main origins of aerosols are natural and anthropogenic. (sepehr.org)

The MODIS instruments on Aqua and Terra measure this carbon absorption, allowing scientists to compare plant productivity around the world. (nasa.gov)
The reason being that any changes in ion-nucleated aerosol number density get attenuated by absorption on existing aerosols before the particles can grow to CCN. (nature.com)

Over a period of several months in early 2002, the MODIS instrument on Terra observed one of these ice shelves collapse and disappear, giving scientists and the world a birds-eye view to "see" this dramatic phenomenon. (nasa.gov)
Earth's surface albedo is regularly estimated via Earth observation satellite sensors such as NASA's MODIS instruments on board the Terra and Aqua satellites, and the CERES instrument on the Suomi NPP and JPSS. (wikipedia.org)
Collection 6 (C6) reprocessing of the product was completed in May 2014 and March 2015 for MODIS Aqua and Terra, respectively. (bvsalud.org)

First, as it drifts over the ice, the smoke particles scatter solar radiation and reduce how much is received at the surface. (severe-weather.eu)
We find that highly porous aerosol particles scatter solar light less efficiently than nonporous aerosol particles. (uni-bielefeld.de)

The NASA GEOS-5 model also nicely shows the smoke spreading, being tracked by the aerosols of Carbon Monoxide (CO). Most of the fires are remote and hard to reach, yet still having widespread influence. (severe-weather.eu)
Here, we demonstrate how observations of carbon monoxide and aerosol optical depth retrieved from polar orbiting and geostationary meteorological satellites can be used to study the long-range transport and evolution of smoke plumes. (bvsalud.org)

Evaluation of black carbon estimations in global aerosol models Atmos. (met.no)

Improvements in and sinks and long-range transport of aerosol events such model simulations demonstrate the utility of OMI AI data as biomass burning aerosols from fires and dust outbreaks, assimilation for aerosol model analysis over cloudy regions is now commonplace at global meteorology centers for air and bright surfaces. (readkong.com)

Twenty years after starting those measurements, scientists figured out that they could use the same observations to detect UV-absorbing aerosols in the air, such as volcanic ash, dust, and smoke. (nasa.gov)
With these measurements, researchers can examine the movement of aerosols over time and space, and even make some general assessments of trends. (nasa.gov)
These had not been used widely for aerosol monitoring over land before, mainly because they lack measurements at several of the main wavelengths used for monitoring aerosols over land and their digitization (for the earlier members of the series) meant that the data could be noisy. (databasefootball.com)
scheme has been developed for assimilating Ozone Monitor- ing Instrument (OMI) aerosol index (AI) measurements into the Naval Aerosol Analysis and Predictive System (NAAPS). (readkong.com)
Further, as AI assimila- optical depth (AOD), lidar backscatter measurements, and tion requires the deployment of a fully multiple-scatter-aware surface aerosol properties can substantially improve accura- radiative transfer model in the forward simulations, compu- cies in CTM analyses and forecasts (Zhang et al. (readkong.com)
Still, we need variational data assimilation (DA) for the MOSAIC aerosols to blend aerosol optical measurements. (copernicus.org)
This study provides a developed GSI variational DA system, with a tangent linear operator designed for multi-source and multi-wavelength aerosol optical measurements. (copernicus.org)

Two additional changes were included in our update: the latest MODIS data have replaced a temporary climatology used for the years 2017-2018 in the 1.X models and the values of two parameters that describe the radiative properties of aerosols were modified in the 2.X (2.0 and 2.1) model versions. (vaisala.com)

In this study, we used 8 years of CALIOP and MODIS observations to derive the shortwave Direct of ACA over global oceans. (confex.com)
Sep 2011, The AeroCom database has been used to evaluate the vertical distribution of aerosols in 12 AeroCom I models using the CALIOP Aerosol Layer product. (met.no)
2011), Application of the CALIOP Layer Product to evaluate the vertical distribution of aerosols estimated by global models: Part 1. (met.no)

Aerosol simulation in WRF-Chem often uses the MOSAIC aerosol mechanism. (copernicus.org)

This spectrum includes visible light (0.4-0.7 μm), which explains why surfaces with a low albedo appear dark (e.g., trees absorb most radiation), whereas surfaces with a high albedo appear bright (e.g., snow reflects most radiation). (wikipedia.org)

They adapted the so-called ' Deep Blue ' algorithm, which is routinely applied at NASA to process data from a number of satellite instruments, including the MODerate Resolution Imaging Spectoradiometers (MODIS), to work with AVHRR data. (databasefootball.com)

We present a methodology in Bayesian framework for retrieving atmospheric aerosol optical depth and aerosol type from the pre-computed look-up tables (LUTs). (copernicus.org)

The MODIS instruments are part of the payload on two polar orbiting satellites launched in 2000 and 2002. (vaisala.com)
2000): "... that both biomass and fossil fuel combustion contribute to the carbonaceous particles, including light absorbing black carbon. (eumetsat.int)
The Long-term Gap-free High-resolution Air Pollutant concentration dataset, providing gap-free aerosol optical depth (AOD) and PM 2.5 and PM 10 concentration with a daily 1 km resolution for 2000-2020 in China, is generated and made publicly available. (copernicus.org)

Our results would be very useful for evaluating the improving modeling simulations of cloudy-sky DRE of aerosols. (confex.com)
Two sets of multi-model simulations within Aerosol Comparisons between Observations and Models (AeroCom), combined with observational methods, and the time evolution of aerosol emissions over the industrial era show that the contribution from cloudy-sky regions is likely weak. (copernicus.org)

modeling are AOD products derived from passive-based Additional data streams can be added, including data from polar-orbiting imagers, such as the Moderate Resolution the TROPOspheric Monitoring Instrument (TROPOMI), the Imaging Spectroradiometer (MODIS), the Visible Infrared Published by Copernicus Publications on behalf of the European Geosciences Union. (readkong.com)

Phytoplankton pigments absorb sunlight for photosynthesis, protect the chloroplast from damage caused by excess light energy, and influence the color of the water. (mdpi.com)
Plankton of different sizes scatter light differently, and plankton with different pigments absorb light differently. (theindependentghana.com)

ACA is an important and interesting component of the climate system for a number of reasons, above all because its shortwave direct radiative effect (DRE) can differ significantly from that of clear-sky aerosols. (confex.com)

Observation of optical properties of atmospheric aerosols, especially their behavior near the surface level, is indispensable for better understanding of atmospheric environmental conditions. (scirp.org)

They now plan to apply their new algorithms to the full AVHRR records and merge them with MODIS and other advanced sensor records, more than doubling the available length of Deep Blue data sets and improving our understanding of how and where the Earth's aerosol burden has been changing. (databasefootball.com)

NASA NEO, Global Aerosol Optical Thickness concentrations acquired using the MODIS sensor, May 2010. (carleton.edu)
We also now include a clear-sky case with simplified aerosol optical properties (once scattering and once more absorbing) uniformly distributed in the lowest 2 km of the model. (met.no)
In the present paper, aerosol parameters in the lower troposphere are monitored using a plan position indicator (PPI) lidar, ground-sampling instruments (a nephelometer, an aethalometer, and optical particle counters), as well as a sunphotometer. (scirp.org)
The purpose of these observations is to retrieve the aerosol extinction coefficient (AEC) and aerosol optical thickness (AOT) simultaneously at the overpass time of Landsat-8 satellite. (scirp.org)
The paper focuses on the aerosol microphysical model selection and characterisation of uncertainty in the retrieved aerosol type and aerosol optical depth (AOD). (copernicus.org)
The SeaWiFS 'Deep Blue' (SWDB) dataset provides aerosol optical thickness and related information from the SeaWiFS sensor (1997-2010). (dlr.de)

The GOME-2 products (ozone, trace gases, aerosols and UV radiation) are important for ozone chemistry, air quality studies, climate modeling, policy monitoring and hazard warnings. (copernicus.org)

2020), Development of a nighttime shortwave radiative transfer model for remote T sensing of nocturnal aerosols and fires from VIIRS , Remote Sensing of Environment, 241 , 111727, doi:10.1016/j.rse.2020.111727. (nasa.gov)

At lower concentrations, they absorb and scatter less sunlight, but may still be visible. (carleton.edu)
As these particles are black, they absorb sunlight and can accelerate ice melt if found in high enough concentrations. (severe-weather.eu)

The red dots represent forest fire spots, detected by MODIS satellites. (severe-weather.eu)

Note that global annual mean cloudy-sky DRE of aerosol ranges from -0.16 to +0.34 W/m2 in the current generation of climate models (Schulz et al. (confex.com)
This is the first long-term gap-free high-resolution aerosol dataset in China and has great potential to trigger multidisciplinary applications in Earth observations, climate change, public health, ecosystem assessment, and environment management. (copernicus.org)

Subscribe / Unsubscribe LANCE-MODIS/VIIRS mailing list. (nasa.gov)

Read more in tomorrow's Image of the Day about other ways the July 2014 fires and aerosols were monitored from space. (nasa.gov)
The aerosol index offers a way to see the long reach of forest fires and dust storms. (nasa.gov)

Read more about NRT MODIS Corrected Reflectance. (nasa.gov)

This analysis compares well with the conclusions of a paper on carbonaceous aerosols over the Indian Ocean (Novakov et al. (eumetsat.int)

Compare this to the smoke plumes from the forest fire near Haifa where the reflection strongly decreases with increasing wave length, suggesting a Rayleigh-scattering regime and due to much smaller smoke particles. (eumetsat.int)

Radiances are simulated at the MODIS 0.646- μ m channel by using a radiative transfer model under homogeneous overcast ice cloudy conditions for COT = 200 and r e = 20 μ m. (ametsoc.org)

The radiative forcing of the aerosol-radiation interaction can be decomposed into clear-sky and cloudy-sky portions. (copernicus.org)
Multivariate data analysis of results from AeroCom Phase II shows that many factors influence the strength of the cloudy-sky contribution to the forcing of the aerosol-radiation interaction. (copernicus.org)
It is measured on a scale from 0 (corresponding to a black body that absorbs all incident radiation) to 1 (corresponding to a body that reflects all incident radiation). (wikipedia.org)

A version of the MODIS Blue Marble is now used as the base layer in many visualizations of NASA Earth science data. (nasa.gov)
In mid-July 2014, the skies were ripe with aerosols, according to Colin Seftor of the OMPS science team at NASA. (nasa.gov)

The purpose of this study is to demonstrate the role of aerosol layer height (ALH) in quantifying. (knmi.nl)
The skies over Northern India, filled with a thick layer of aerosol particles along the southern edge of the Himalayan Mountains. (carleton.edu)
Therefore, in the present paper, a novel monitoring technique is proposed and demonstrated for retrieving nearly horizontal distribution of aerosol in the atmospheric boundary layer by combining the data from a plan-position indicator (PPI) lidar and visible images of Operational Land Imager (OLI) onboard Landsat-8 satellite. (scirp.org)
Since the major target of these instruments is the aerosol particles in the atmospheric boundary layer, the elevation angles of these lidars are set to be small (4˚ for PPI and 30˚ for SP). (scirp.org)

The MODIS instrument team constantly refines its data processing algorithms and recently released Collection (version) 6.1 of its products, in which their latest algorithms have been applied retrospectively to all data collected by the MODIS instruments. (vaisala.com)
The team demonstrated this by processing data from three of the existing AVHRR missions, and compared this to MODIS data as well as ground-based observations, to validate their adapted algorithms. (databasefootball.com)
To download MODIS data, register for an Earthdata Login . (nasa.gov)
The radiative transfer calculation is conducted using the MODTRAN code with the original aerosol type that has been determined from the ground sampling data coupled with the Mie scattering calculation. (scirp.org)
1 Introduction This study suggests that both root mean square error (RMSE) and absolute errors can be significantly reduced in NAAPS Operational chemical transport modeling (CTM) of atmo- analyses with the use of OMI AI data assimilation when com- spheric aerosol particles, including simulation of sources pared to values from NAAPS natural runs. (readkong.com)
alone does not outperform aerosol data assimilation that uses Lynch et al. (readkong.com)
But Cael's team pored over 20 years of observations by Nasa's Modis-Aqua satellite, an exhaustive data repository, and looked for patterns of change in the ocean's hue through a fuller colour spectrum including red and blue. (theindependentghana.com)

There are many reasons scientists are interested in aerosols. (carleton.edu)
Recently, a team led by scientists at NASA's Goddard Space Flight Center in Greenbelt, MD in collaboration with Universities Space Research Association (USRA), the University of Maryland , and Science Systems and Applications demonstrated a proof of concept to fill this gap in the over-land aerosol time series. (databasefootball.com)
How could scientists scattered across the world look over each other's shoulders as they built a plan, and make suggestions and changes and quibble with each other's decisions? (nasa.gov)

Anatomy13

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Moderate Resolution Imagin7

Single-scatte1

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Cloud10

Retrieval of Aerosol Optical Depth1

Water vapor2

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20171

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20003

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