This presentation will cover multiple aspects of my research on Earth's energy balance and planetary heat uptake. We will discuss different approaches to estimate Earth’s energy imbalance (EEI) including the assessment of the contemporary sea level budget using Argo, altimetry and GRACE/GRACE-FO observations.

Experience has shown that the measurements of light scattering by surfaces, described by the bidirectional reflectance-distribution function (BRDF) is an art in itself.

The size distribution of liquid cloud droplets plays an important role in defining different cloud behaviors ranging from light scattering and precipitation development processes.

Science Highlights

Using the full spectrum of remote sensing reflectance to elucidate color shifts in the ocean

Satellite-based remote sensing data set of global surface water storage change from 1992 to 2018

Recent Advances in the Goddard CSH Algorithm for GPM Expand Capabilities to Address Extratropical Precipitation

Field Campaigns

The seventh and final cruise for the project entitled "Impacts of Climate Variability on Primary Production and Carbon Distributions in the Middle Atlantic Bight and Gulf of Maine" (CLiVEC) was carried out on board the R/V Henry Bigelow from August 7-24, 2012. CLiVEC is a joint research project with researchers from Old Dominion University (ODU) and the National Oceanographic and Atmospheric Administration (NOAA).

The Ocean Ecology Laboratory Field Program Support Group (FPSG; code 616) was recently invited to participate in a cruise of opportunity aboard the R/V Kilo Moana, a 186 foot, dual-hulled research vessel operated by the University of Hawaii for the National Science Foundation and stationed in Honolulu, Hawaii.

NASA HQ supported an oceanographic field campaign in Chesapeake Bay this summer to coincide with the NASA DISCOVER AQ (Deriving Information on Surface Conditions from COlumn and VERtically Resolved Observations Relevant to Air Quality) EV-1 project managed by LARC and GSFC.

Space Missions

The National Academies of Sciences, Engineering and Medicine (NASEM) 2017 Decadal Survey, “Thriving on Our Changing Planet: A Decadal Strategy for Earth Observations from Space,” identified five designated foundational observations to be implemented in the next decade.


The Snow Water Equivalent Synthetic Aperture Radar and Radiometer (SWESARR) is a new instrument designed to measure the water content in a snowpack. The instrument, developed at NASA’s Goddard Space Flight Center, uses active and passive microwave sensors to map the radio frequency emissions of the snowpack, which can then be turned into a measurement of snow water equivalent.


The purpose of the Sea-viewing Wide Field-of-view Sensor (SeaWiFS; 1997-2010) Project is to provide quantitative data on global ocean bio-optical properties to the Earth science community. Subtle changes in ocean color signify various types and quantities of marine phytoplankton (microscopic marine plants), the knowledge of which has both scientific and practical applications. The SeaWiFS Project will develop and operate a research data system that will process, calibrate, validate, archive and distribute data received from an Earth-orbiting ocean color sensor.

Research Areas


The objective of this project is to collect essential data for Rift Valley fever virus (RVFV) epidemiology and ecology that has been neglected by the significant amount of research previously conducted on the virus. 

Aerosol dynamics are a global phenomena that affect all aspects of remote sensing from the UV through the near infrared spectrum. Thus it is part of the signal for any remote sensing of vegetation, ocean and atmosphere and is critical for quantifying Earth radiative forcing. Due to the high variability of aerosols over space and time, the contribution to the signal can range from insignificant to dominant. The IPCC has reported that aerosols remain the most uncertain component to quantify the anthropogenic forcing of the earth. 

Land-atmosphere fluxes of energy, water, and carbon exert a strong control on atmospheric properties, and thus provide a key forcing for global climate. GSFC has a long history of incorporating remotely sensed data on land properties into land-atmosphere models, including the pioneering Simple Biosphere (SiB) model. This work extends to understanding how human land use, including urbanization, affects regional and global climate.


Data Files

The NASA-USDA Global soil moisture data provides soil moisture information across the globe at 0.25°

The datasets below contain sea surface salinity retrieved by NASA’s Aquarius instrument collocated with in situ measurements by the Argo network of free drifting profiling floats. Sea surface salinity for Argo is defined as the shallower measurements reported by an Argo float as long as that measurement was reported for a depth of 10 m or less. Aquarius SSS, derived from L-band radiometry, are representative of the first few centimeters of the ocean surface layer.

Since the beginning of the GRACE mission it has been standard practice to apply atmosphere and ocean de-aliasing products when processing the Level 1B data in order to directly remove these high-frequency signals from the inter-satellite measurements and the distributed gravity solutions.


NASA's Land, Vegetation, and Ice Sensor or "LVIS", is an airborne, wide-swath imaging laser altimeter system that is flown over target areas to collect data on surface topography and 3-d structure.


EcoSAR is an advanced airborne polarimetric and interferometric P-band (435 MHz) SAR instrument in development at NASA/Goddard Space Flight Center through the 2010 ESTO Instrument Incubator Program (IIP). The aim of EcoSAR is to provide two- and three dimensional fine scale measurements of terrestrial ecosystem structure and biomass.


Development of field radiometers for satellite calibration and validation.



​SWATOnline is a web application developed for hydroclimatic application to leverage data sharing capabilities employing current web technologies.  The SWATOnline web app can be duplicated, installed, and hosted anywhere.  The work presented in this web app represents an effort to lower technical barriers for the Soil and Water Assessment Tool (SWAT) model through using open source web development, web services, and cloud storage technologies.


It is now well established that the global ocean is on average a CO2 sink of about 2 PgC yr-1 accumulating anthropogenic CO2 with a direct impact on the pH and consequently the marine biota. In recent years, several analyses based on CO2 observations in the North Atlantic, North and Equatorial Pacific, and Southern Ocean, show that the ocean uptake is not steady on interannual to decadal scales and that it might impact the atmospheric CO2 content.