A5077072795- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Hydrology and Watershed Management Studies
- Geophysics and Gravity Measurements
- Flood Risk Assessment and Management
- Atmospheric chemistry and aerosols
- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Atmospheric aerosols and clouds
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Plant Water Relations and Carbon Dynamics
- Climate Change Policy and Economics
- Hydrology and Drought Analysis
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Grouting, Rheology, and Soil Mechanics
- Ecology and Vegetation Dynamics Studies
- Aeolian processes and effects
- Rangeland and Wildlife Management
- Space Exploration and Technology
- Climate change impacts on agriculture
- GNSS positioning and interference
- Tailings Management and Properties
- Landfill Environmental Impact Studies
Goddard Space Flight Center
2016-2025
University of Maryland, Baltimore County
2022
Universities Space Research Association
2016-2021
John F. Kennedy University
2016-2020
Harvard University
2015-2020
Science Systems and Applications (United States)
2020
University of Maryland Center for Environmental Science
2020
Universidade Federal de Santa Catarina
2016
Abstract Land conversion and changing climate are expected to significantly alter tropical forest hydrology. We used a land surface model integrated with river routing scheme analyze the hydrological alterations in Tapajós River basin, large portion of Brazilian Amazon, caused by two environmental drivers: use. The was forced future scenarios (years 2026–2045) from Earth System Model HadGem2‐ES moderate (+4.5 W/m 2 radiative forcing value year 2100 respect preindustrial levels) severe (+8.5...
Over the past 40 years, discharge in South America's Paraná River basin has increased despite no evidence of significant rainfall increases basin. In this analysis, we show that observed multi-decadal increase can be explained by concomitant changes land cover have occurred within during period. Our analysis also indicates peak timing may shifted concurrently from January/February 1970s to March more recent decades. While land-use effect dominantly alters long-term temporal dynamics river...
Near-real-time (NRT) and subseasonal-to-seasonal (S2S) observational systems can provide the opportunity to compare short-term projections with observed climate events impacts on atmospheric methane, leading a deeper understanding of global wetland methane cycle. Here, we applied Lund-Potsdam-Jena Earth Observation SIMulator (LPJ-EOSIM) dynamic vegetation model estimate NRT natural emissions. We first investigate 2023 emissions then focus case study investigating deployment S2S forecasts...
Significance We report how much water flooded Bangladesh during the 2020 wet monsoon period and explain why monsoonal flooding started unusually early, lasted longer, was more severe than in other years. The laser-ranging instrument on GRACE Follow-On spacecraft detected size timing of this unusual event, we found that worsened by soils saturated earlier usual a premonsoon cyclone. highlight importance including antecedent soil moisture condition present flood forecasting warning practices...
Following extreme drought during the 2019-2020 bushfire summer, eastern part of Australia suffered from a week-long intense rainfall and extensive flooding in March 2021. Understanding how much water storage changes response to these climate extremes is critical for developing timely management strategies. To quantify prompt associated with 2021 flooding, we processed low-latency (1-3 days), high-precision intersatellite laser ranging measurements GRACE Follow-On spacecraft determined...
Abstract Tropical river basins are experiencing major hydrological alterations as a result of climate variability and deforestation. These drivers flow changes often difficult to isolate in large based on either observations or experiments; however, combining these methods with numerical models can help identify the contribution deforestation alterations. This paper presents study carried out Tapajόs River (Brazil), 477,000 km 2 basin South‐eastern Amazonia, which we analysed role annual...
Abstract. Land carbon fluxes, e.g., gross primary production (GPP) and net biome (NBP), are controlled in part by the responses of terrestrial ecosystems to atmospheric conditions near Earth's surface. The Coupled Model Intercomparison Project Phase 6 (CMIP6) has recently proposed increased spatial temporal resolutions for surface CO2 concentrations used calculate GPP, yet a comprehensive evaluation consequences this resolution cycle dynamics is missing. Here, using global offline...
Abstract. The Amazon experiences fires every year, and the resulting biomass burning aerosols, together with cloud particles, influence penetration of sunlight through atmosphere, increasing ratio diffuse to direct photosynthetically active radiation (PAR) reaching vegetation canopy thereby potentially ecosystem productivity. In this study, we use NASA Goddard Earth Observing System (GEOS) model coupled aerosol, cloud, radiation, modules investigate impact aerosols on productivity, as well...
Abstract. Land surface models are excellent tools for studying how climate change and land use affect hydrology. However, in order to assess the impacts of Earth processes on river flows, simulated changes runoff need be routed through landscape. In this technical note, we describe integration Ecosystem Demography (ED2) model with a hydrological routing scheme. The purpose study was create tool capable incorporating predictions terrestrial ecosystem responses climate, carbon dioxide,...
Abstract Here we present a first look at the Gross Primary Production (GPP) forecast skill levels achievable with state‐of‐the‐art subseasonal‐to‐seasonal (S2S) system. Using NASA's retrospective S2S ensemble in conjunction terrestrial biosphere model, and using an independent, remote sensing‐based data set for validation, demonstrate ability to accurately spring‐summer carbon uptake multi‐month leads. Averaged across mid‐ high latitudes of Northern Hemisphere land, GPP initialized on...
Abstract The impacts of drought on regional land and atmospheric carbon are still poorly understood. Here we quantify the impact a U.S. fluxes (gross primary production, or GPP, net biosphere production) (CO 2 ) by imposing an idealized 3‐month meteorological in ensemble coupled land‐atmosphere climate simulations. imposed drought, applied to lower Mississippi River Valley (~500,000 km ), leads 23% GPP reduction area month immediately following drought's termination. also caused reductions...
Abstract. Land carbon fluxes, e.g., gross primary production (GPP) and net biome (NBP), are controlled in part by the responses of terrestrial ecosystems to atmospheric conditions near Earth's surface. The Coupled Model Intercomparison Project Phase 6 (CMIP6) has recently proposed increased spatial temporal resolutions for surface CO2 concentrations used calculate GPP, yet a comprehensive evaluation consequences this resolution cycle dynamics is missing. Here, using global offline...
Abstract. Land surface models are excellent tools for studying how climate change and land use affect hydrology. However, in order to assess the impacts of earth processes on river flows, simulated changes runoff need be routed through landscape using a hydrological transport scheme. In this Technical Note we describe integration Ecosystem Demography (ED2) model with routing ED2 is terrestrial biosphere capable incorporating sub-grid scale ecosystem heterogeneity arising from land-use...