A5032294936- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Geophysics and Gravity Measurements
- Climate variability and models
- Precipitation Measurement and Analysis
- Air Quality and Health Impacts
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Satellite Communication Systems
- Spacecraft Design and Technology
- Astronomical Observations and Instrumentation
- Climate Change and Geoengineering
- Antenna Design and Optimization
- Ionosphere and magnetosphere dynamics
- Radio Wave Propagation Studies
- Cryospheric studies and observations
- Calibration and Measurement Techniques
- Vehicle emissions and performance
- Geochemistry and Geologic Mapping
- Gaze Tracking and Assistive Technology
- Tactile and Sensory Interactions
- Air Quality Monitoring and Forecasting
Goddard Space Flight Center
2018-2024
Earth System Science Interdisciplinary Center
2022-2024
University of Maryland, College Park
2022-2024
Universities Space Research Association
2018-2021
National Postdoctoral Association
2020
Purdue University West Lafayette
2017
National Centre for Earth Science Studies
2011
The Goddard Earth Observing System composition forecast (GEOS-CF) system is a high-resolution (0.25°) global constituent prediction from NASA's Global Modeling and Assimilation Office (GMAO). GEOS-CF offers new tool for atmospheric chemistry research, with the goal to supplement broad range of space-based in-situ observations. expands on GEOS weather aerosol modeling by introducing GEOS-Chem module provide hindcasts 5-days forecasts constituents including ozone (O
Abstract Optically thick smoke aerosol plumes originating from biomass burning (BB) in the southwestern African Savanna during austral spring are transported westward by free tropospheric winds to primarily overlie vast stretches of stratocumulus cloud decks southeast Atlantic. We evaluated simulations long‐range transport BB Goddard Earth Observing System (GEOS‐5) and four other global models over complete South African‐Atlantic region using Cloud‐Aerosol Lidar with Orthogonal Polarization...
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...
Abstract. Interactions of meteorology with wildfires in British Columbia, Canada, during August 2017 led to three major pyrocumulonimbus (pyroCb) events that resulted the injection large amounts smoke aerosols and other combustion products at local upper troposphere lower stratosphere (UTLS). These plumes UTLS elevated values aerosol extinction backscatter compared background state were readily tracked by multiple satellite-based instruments as they spread across Northern Hemisphere (NH)....
Abstract Previous evaluations of simulated aerosol transport over the south‐east Atlantic by global models, including Goddard Earth Observing System (GEOS) atmospheric general circulation model, showed that bulk modeled smoke layer resided ~1–2 km lower than Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) lidar observations. Using this finding as motivation, study examines changes in model‐simulated cloud properties response to redistributing vertical placement ocean. Ten years...
Recent fire seasons have featured volcanic-sized injections of smoke aerosols into the stratosphere where they persist for many months. Unfortunately, aging and transport these are not well understood. Using space-based lidar, vertical spatial propagation can be tracked inferences made as to their size shape. In this study, CATS CALIOP lidar were used track evolution stratospheric aerosol plumes resulting from 2019–2020 Australian bushfire 2017 Pacific Northwest pyrocumulonimbus events...
Abstract. In order to improve aerosol representation in the NASA Goddard Earth Observing System (GEOS) model, we evaluated simulations of transport and properties aerosols from southern African biomass burning sources that were observed during first deployment ORACLES (ObseRvations Aerosols above CLouds their intEractionS) field campaign September 2016. An example case study 24 was analyzed detail, which aircraft-based situ remote sensing observations showed presence a multi-layered smoke...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Advances in Modeling Systems (JAMES). ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Description NASA GEOS Composition Forecast System GEOS-CF v1.0AuthorsChristoph A.KelleriDK. EmmaKnowlandBryan NDuncanJunhuaLiuDaniel...
Hamza Varikodena*, R. Harikumarb, Vishnuc, V. Sasi Kumarc, S. Sampathc, Murali Dasc & G. Mohan Kumarc a Indian Institute of Tropical Meteorology , Pashan Pune-411 008 India b National Centre for Ocean Information Services Hyderabad-500 055 c Atmospheric Sciences Division, Earth Science Studies Thiruvananthapuram-31
Abstract. The Goddard Chemistry Aerosol Radiation and Transport (GOCART) model, which controls the sources, sinks, chemistry of aerosols within Earth Observing System (GEOS), recently underwent a major refactoring update, including revision emissions datasets addition brown carbon. A 4-year benchmark simulation utilizing new version model code, termed GOCART Second Generation (GOCART-2G) coupled to (GEOS) was evaluated using in situ spaceborne measurements develop baseline prioritize future...
Abstract. The Pacific Northwest Pyrocumulonimbus Event (PNE) took place in British Columbia during the evening and nighttime hours between 12 13 August 2017. Several pyroconvective clouds erupted on this occasion, released upper troposphere lower stratosphere unprecedented amounts of carbonaceous aerosols (300 ktn). Only a few years later, an even larger pyrocumulonimbus (pyroCb) injection over Australia. This event, named “the Australian New Year (ANY) event”, injected up to 1100 ktn...
Abstract Complicated by seasonal transport of biomass burning aerosol plumes primarily overlaying the marine stratocumulus‐to‐cumulus transition, complexity atmosphere over southeast Atlantic Ocean is difficult to represent in models. Biases with respect height plume and excessive subsidence have previously been documented MERRA‐2. This paper further diagnoses these biases, addresses unreasonable region currently simulated Goddard Earth Observing System (GEOS) model during first deployment...
Abstract. The Pacific Northwest pyrocumulonimbus Event (PNE) took place in British Columbia during the nighttime hours between 12th and 13th of August 2017. Several pyroconvective clouds erupted this occasion, released upper troposphere/lower stratosphere unprecedented amounts carbonaceous aerosols (300 ktn). Only a few years later, an even larger pyroCb injection over Australia. This event, named Australian New Year (ANY) injected up to 1100 ktn aerosol December 29th 2019 January 4th 2020....
Abstract. In order to improve aerosol representation in the NASA Goddard Earth Observing System (GEOS) model, we evaluated simulations of properties and transport over southern African biomass burning source outflow region using observations made during first deployment ORACLES (ObseRvations Aerosols above CLouds their intEractionS) field campaign September 2016. An example case study 24 was analyzed detail, which aircraft-based in-situ remote sensing showed presence a multi-layered smoke...
Abstract. The Goddard Chemistry Aerosol Radiation and Transport (GOCART) model, which controls the sources, sinks, chemistry of aerosols within Earth Observing System, recently underwent a major refactoring update to representation physical processes. This paper serves document code changes that were included in GOCART 2nd Generation (GOCART-2G) establishes benchmark simulation is be used for future development system. increases flexibility such multiple instances an aerosol species can run...
<p>Interactions of meteorology with wildfires in British Columbia, Canada during August 2017 led to several extreme pyrocumulonimbus (PyroCb) events that resulted the injection smoke aerosols and other combustion products into lower stratosphere. These plumes stratospheric were observed by many satellite instruments have elevated values aerosol extinction backscatter compared background state readily tracked as they spread across Northern Hemisphere resided stratosphere for...
A cheap instrument for conducting scientific research tasks and testing new space technology is a nanosatellite mission. There were 371 launches between2000 2016, with 15.4% of them successfully completing their missions, another 22.6% doing so in part. Numerous issues, including system instability, can be blamed the high failure rate nanosatellites. Integration, hardware not suitable space, failed launch, unproven technologies. some dangers By embracing design exploration, optimization,...