A5040698693- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Aeolian processes and effects
- Marine and coastal ecosystems
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Cryospheric studies and observations
- Remote Sensing in Agriculture
- Advanced Optical Sensing Technologies
- Air Quality Monitoring and Forecasting
- Tropical and Extratropical Cyclones Research
- Impact of Light on Environment and Health
- Climate Change and Health Impacts
- Oceanographic and Atmospheric Processes
- Remote Sensing and LiDAR Applications
- Ionosphere and magnetosphere dynamics
- Ocean Waves and Remote Sensing
- Planetary Science and Exploration
- Water Quality Monitoring and Analysis
- Fire effects on ecosystems
- Optical Systems and Laser Technology
- Water Quality Monitoring Technologies
- Air Quality and Health Impacts
Langley Research Center
2015-2024
University of Mosul
2023
National Observatory of Athens
2022
Aristotle University of Thessaloniki
2022
University of Leicester
2022
Al-Azhar University
2020
National Aeronautics and Space Administration
2009
Commonwealth Scientific and Industrial Research Organisation
2008
Hampton University
1999-2003
University of Illinois Urbana-Champaign
1998-1999
Abstract The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) is a two-wavelength polarization lidar that performs global profiling of aerosols and clouds in the troposphere lower stratosphere. CALIOP primary instrument on Infrared Pathfinder Satellite Observations (CALIPSO) satellite, which has flown formation NASA A-train constellation satellites since May 2006. global, multiyear dataset obtained from provides new view earth’s atmosphere will lead to an improved understanding role...
Abstract Descriptions are provided of the aerosol classification algorithms and extinction-to-backscatter ratio (lidar ratio) selection schemes for Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) products. One year CALIPSO level 2 version data analyzed to assess veracity aerosol-type identification algorithm generate vertically resolved distributions types their respective optical characteristics. To robustness algorithm, interannual variability is by using a fixed...
Abstract The Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite was launched in April 2006 to provide global vertically resolved measurements of clouds aerosols. Correct discrimination between aerosols observed by the lidar aboard CALIPSO is critical for accurate retrievals cloud aerosol optical properties correct interpretation measurements. This paper reviews theoretical basis (CAD) algorithm, describes enhancements made version 2 algorithm that used...
Abstract. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) version 4.10 (V4) level 2 aerosol data products, released in November 2016, include substantial improvements to the subtyping and lidar ratio selection algorithms. These are described along resulting changes optical depth (AOD). most fundamental change V4 products is a new algorithm identify subtypes stratosphere. Four introduced for stratospheric aerosols: polar (PSA), volcanic ash, sulfate/other, smoke. tropospheric...
We use radiance measurements and inversions of the Aerosol Robotic Network (AERONET) (Dubovik King, 2000; Holben et al., 1998; 2001) to classify global atmospheric aerosols using complete archive AERONET data set as December 2002 dating back 1993 for some sites. More than 143,000 records solar measurements, derived aerosol size distributions, complex refractive indices are used generate optical properties at more 250 sites worldwide. Each record is in a clustering algorithm an object, with...
The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite will be launched in April of 2005, make continuous measurements the Earth's atmosphere for following three years. Retrieving spatial optical properties clouds aerosols from CALIPSO lidar backscatter data confronted by a number difficulties that are not faced analysis ground-based data. Among these very large distance target, high speed at which traverses ground track, ensuing low signal-to-noise ratios...
Abstract The productivity of the Amazon rainforest is constrained by availability nutrients, in particular phosphorus (P). Deposition long‐range transported African dust recognized as a potentially important but poorly quantified source phosphorus. This study provides first multiyear satellite‐based estimate deposition into Basin using three‐dimensional (3‐D) aerosol measurements over 2007–2013 from Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP). 7 year average estimated to be 28...
Abstract The current cloud thermodynamic phase discrimination by Cloud-Aerosol Lidar Pathfinder Satellite Observations (CALIPSO) is based on the depolarization of backscattered light measured its lidar [Cloud-Aerosol with Orthogonal Polarization (CALIOP)]. It assumes that from ice crystals depolarizing, whereas water clouds, being spherical, result in minimal depolarization. However, because relationship between CALIOP field view (FOV) and large distance satellite clouds frequent presence...
An extensive dust storm originating on 17 August 2006 in North Africa was observed and tracked by the Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) lidar. Over next several days, layer moved westward across Atlantic Ocean into Gulf of Mexico. The initial stages event were examined using a sequence CALIPSO measurements. first these acquired very near source 18 August. Successive measurements made over 19 20 August, at respective locations approximately ∼1300 km...
This study examines seasonal variations of the vertical distribution aerosols through a statistical analysis Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) lidar observations from June 2006 to November 2007. A data‐screening scheme is developed attain good quality data in cloud‐free conditions, polarization measurement used separate dust non‐dust aerosol. The CALIPSO aerosol are compared with simulations Goddard Chemistry Aerosol Radiation Transport (GOCART)...
Abstract. Aerosol classification products from the NASA Langley Research Center (LaRC) airborne High Spectral Resolution Lidar (HSRL-1) on B200 aircraft are compared with coincident V3.01 aerosol Cloud-Aerosol Orthogonal Polarization (CALIOP) instrument CALIPSO satellite. For CALIOP, is a key input to retrieval, and must be inferred using loading-dependent observations location information. In contrast, HSRL-1 makes direct measurements of intensive properties, including lidar ratio, that...
The Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission will carry into space the Ocean Color Instrument (OCI), a spectrometer measuring at 5 nm spectral resolution in ultraviolet (UV) to near infrared (NIR) with additional bands shortwave (SWIR), and two multi-angle polarimeters that overlap OCI range spatial coverage. These instruments, especially when used synergy, have great potential for improving estimates of water reflectance post Earth Observing System era. Extending...
Deposition of mineral dust into ocean fertilizes ecosystems and influences biogeochemical cycles climate. In-situ observations deposition are scarce, model simulations depend on the highly parameterized representations processes with few constraints. By taking advantage satellites' routine sampling global decadal scales, we estimate African flux loss frequency (LF, a ratio to mass loading) along trans-Atlantic transit using three-dimensional distributions aerosol retrieved by spaceborne...
Abstract. The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Operations (CALIPSO) mission released version 4.1 (V4) of their lidar level 2 cloud aerosol data products in November 2016. These new were derived from the CALIPSO V4 1 data, which calibration measured backscatter at both 532 1064 nm was significantly improved. This paper describes updates to cloud–aerosol discrimination (CAD) algorithm that more accurately differentiate between clouds aerosols throughout Earth's atmosphere....
Abstract We compare the aerosol optical depths (AOD) retrieved from backscatter measurements of Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard Cloud Aerosol Infrared Pathfinder Satellite Observations (CALIPSO) satellite coincident Robotic Network (AERONET) measurements. Overpass coincidence criteria ±2 h and within a 40 km radius are satisfied at least once 149 globally distributed AERONET sites 2006 to 2010. Most data pairs (>80%) use acquired ±30 min overpass. examine...
Abstract. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) is carried on the CALIPSO satellite and has acquired global aerosol profiles since June 2006. flown in formation Aqua as part of A-train constellation, so that a large number coincident observations are available from CALIOP MODIS-Aqua instrument. This study compares column optical depth at 0.532 μm derived 0.55 over period 2006 through August 2008. based Version 2 Aerosol Layer Product MODIS Collection 5. While first...
Convective clouds produce a significant proportion of the global precipitation and play an important role in energy water cycles. We quantify changes convective cloud ice mass-weighted altitude centroid (ZIWC) as function aerosol optical thickness (AOT). Analyses are conducted smoke, dust polluted continental environments over South America, Central Africa Southeast Asia, using latest measurements from CloudSat CALIPSO satellites. find aerosols can inhibit or invigorate convection, depending...
Data products from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) on board and Infrared Pathfinder Satellite Observations (CALIPSO) were recently updated following implementation of new (version 4) calibration algorithms for all level 1 attenuated backscatter measurements. In this work we present motivation version 4 nighttime 532 nm parallel channel calibration. The is most fundamental CALIOP data, since CALIOP's other radiometric procedures - i.e., daytime 1064 calibrations...
Abstract A carbonaceous aerosol plume associated with wildfires in British Columbia August 2017 reached the stratosphere a few days following fires onset. The Earth Polychromatic Imaging Camera (EPIC) sensor onboard Deep Space Climate Observatory (DSCOVR) satellite observed spatial and temporal evolution of for about 6 weeks. EPIC's near‐hourly observations Earth's sunlit disk allowed monitoring smoke several times per day. High ultraviolet index values pointed to presence an layer upper...
We provide an overview of light detection and ranging (lidar) capability for describing characterizing desert dust. This paper summarizes lidar techniques, observations, fallouts dust measurements. The main objective is to the scientific community, including nonpractitioners observations with a reference on In particular, it will fill current gap communication between research-oriented community potential data users, such as air quality monitoring agencies aviation advisory centers....
The Plankton, Aerosol, Clouds, ocean Ecosystem (PACE) mission presents new opportunities and challenges in applying observations of two complementary multi-angle polarimeters for the space-based retrieval global aerosol properties. Aerosol remote sensing from radiometric-only enables characterization to a greater degree than single-view radiometers, as demonstrated by nearly decades heritage instruments. Adding polarimetry allows optical depth, Angstrom exponent, parameters size...
Polar ocean ecosystems are experiencing rapid environmental change, but measuring the associated phytoplankton responses is challenging using traditional satellite passive color measurements due to signal contamination from clouds and sea ices low solar elevation angles. Active lidar allow retrieval of properties under conditions prohibitive sensors. The ICESat-2 provide two-dimensional distributions upper properties. spring blooms extending about 230 km horizontally dense packs ice near...
Abstract. Global satellite observations of lidar backscatter measurements acquired by the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) mission collocated sea surface wind speed data from Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E), are used to investigate relation between driven wave slope variance speed. The new – established this study is similar linear Cox-Munk (1954) log-linear Wu (1972, 1990) larger than 7 m/s 13.3 m/s,...
The Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) is an elastic backscatter lidar carried on the CALIPSO satellite. CALIOP observations between 15 and 20 April 2010 of volcanic ash plumes following eruption Icelandic Eyjafjallajökull volcano are reported here. While has limited spatial coverage due to nadir‐only sampling, were observed by over a wide region ‐ from North Atlantic Ocean eastern Europe during both day night. Due its view, however, did not sample densest which...