News and Events

Climate & Radiation Events

The title for my talk is taken from the 2009 National Academy Committee report “Observing the Weather and Climate from the Ground Up: A Nationwide Network of Networks” that made the case for a thermodynamic profiling of the immediate atmospheric layer (Planetary Boundary layer or PBL) we influence.

At least seven major wildfires were burning across California as early as ~10:30 AM local time on 20 August 2020.

This talk will begin with an overview of recent development in the NASA GISS General Circulation Model (GISS-E3 GCM, currently about to be submitted to CMIP6). 

An accurate assessment of both how Earth’s climate is changing and which physical processes and feedbacks are driving those changes requires highly accurate and stable measurements, stable retrieval algorithms, and measurements with sufficient information content for climate change detection and attribution.

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.

Aerosols continue to be responsible for the largest uncertainty in determining the anthropogenic radiative forcing of the climate. To both reconcile the large range in satellite-based estimates of the aerosol direct radiative effect (DRE, the direct interaction with solar radiation by all aerosols) and to optimize the design of future observing systems, we build a framework for assessing uncertainty in aerosol DRE and the aerosol direct radiative forcing (DRF, the radiative effect of just anthropogenic aerosols, RF_ari).

Tomography aims to recover a three-dimensional (3D) density map of a medium or an object. In medical imaging, it is extensively used for diagnostics via X-ray computed tomography (CT). Optical diffusion tomography is an alternative to X-ray CT that uses multiple scattered light to deliver coarse density maps for soft tissues.

As air quality in the Eastern United States has improved, determining the root cause of air pollution episodes has become more challenging. This not only impacts the ability to reliably forecast pollution episodes but also the development of regulations that will lead to further reductions in ozone and its precursors, such as NOxand volatile organic compounds (VOCs).

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.

Last year, a colleague whom I have not seen for more than 10 years (and probably have only exchanged a handful of emails with) invited me to participate as a remote sensing instructor for oceanography students during a summer short course. The venue was onboard the world-renowned icebreaker Polarstern.

Passive aerosol sensors composing the present generation of space-based instrumentation generally permit measurements spanning the majority of the shortwave spectrum, or observations at multiple viewing angles, but rarely both. Moreover, very few of these instruments possess sensitivity to polarization, and those that do lack the accuracy required to fully utilize this quantity.