The proof is in the clouds

Jan 26, 2012
A stratocumulus cloud deck over the South Pacific Ocean, as seen by NASA's Moderate Resolution Imaging Spectroradiometer (MODIS). Image courtesy of the National Aeronautics and Space Administration Earth Observatory and obtained from the NASA Terra satellite.

For most people, clouds are just an indication of whether it's a "good" or "bad" day. A team of scientists from Pacific Northwest National Laboratory found that certain clouds hold the key to climate behavior prediction. The researchers improved the modeling system to simulate the way clouds interact with particles in the air. The team assessed the state-of-the-art model's ability to simulate clouds and their interaction with fine particles in the air and pollution.

Accurate prediction of how heavy pollution will influence is one of the best ways to protect the future of the planet.  Scientists can help by creating models of how the climate responds to many different variables. Projecting how clouds over oceans may be influenced by pollution, tiny bits of smoke, or chemicals is important because these clouds are part of a cycle that influences temperatures and precipitation in many areas of the world. Researchers showed the value of a model to predict complex interactions between atmospheric and clouds.

It is important to study the accuracy of different climate modeling systems so scientists can determine the minimum level of complexity necessary to produce meaningful climate prediction.

A research team assessed simulations produced by WRF-Chem coupled with a new module, using observations from the VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS). They analyzed VOCALS data, as well as satellite images and data.

The team performed comprehensive evaluations of the models in simulating aerosols, , and their interactions. Aerosols and aerosol-cloud interactions not only influence cloudiness and precipitation, but also lowers and modifies the cloud-top height, and a mean subsidence above the cloud top. They showed that WRF-Chem was accurate down to a very a small time scale in predicting aerosol interactions with cloud properties.

WRF-Chem is a regional meteorological model, with major improvements in aerosol and chemistry modules supplied by PNNL.

Validating the WRF-Chem model predictions of the regional climate and energy budget was the first step. Scientists can now use WRF-Chem to quantify and evaluate many other issues, such as quantifying the impacts of human-caused and natural emissions on the regional climate.

Explore further: NASA balloons begin flying in Antarctica for 2014 campaign

More information: Yang Q, et al. 2011. "Assessing Regional Scale Predictions of Aerosols, Marine Stratocumulus, and Their Interactions During VOCALS-Rex Using WRF-Chem." Atmospheric Chemistry and Physics, 11:22663-22718. DOI:10.5194/acpd-11-22663-2011

add to favorites email to friend print save as pdf

Related Stories

Down-and-dirty details of climate modeling

May 04, 2011

For the first time, researchers have developed a comprehensive approach to look at aerosols—those fine particles found in pollution—and their effect on clouds and climate. Scientists from Pacific ...

Tiny particles, big impact

Jun 03, 2011

Atmospheric aerosols may be small, ranging in size from a few nanometers to a few microns, but they have a big impact on climate.  At the Pacific Northwest National Laboratory, capabilities developed ...

Connecting the dots on aerosol details

Jul 27, 2011

Predicting future climate change hangs on understanding aerosols, considered the fine details in the atmosphere. Researchers at Pacific Northwest National Laboratory and the National Center for Atmospheric ...

The insides of clouds may be the key to climate change

Feb 17, 2007

As climate change scientists develop ever more sophisticated climate models to project an expected path of temperature change, it is becoming increasingly important to include the effects of aerosols on clouds, according ...

The birth of a cloud droplet

Oct 31, 2011

(PhysOrg.com) -- Wrapped in mystery, the formation of a cloud droplet comes down to physics. Pacific Northwest National Laboratory led a research team that has helped peel away another layer of the cloud droplet ...

Recommended for you

Scientists make strides in tsunami warning since 2004

Dec 19, 2014

The 2004 tsunami led to greater global cooperation and improved techniques for detecting waves that could reach faraway shores, even though scientists still cannot predict when an earthquake will strike.

Trade winds ventilate the tropical oceans

Dec 19, 2014

Long-term observations indicate that the oxygen minimum zones in the tropical oceans have expanded in recent decades. The reason is still unknown. Now scientists at the GEOMAR Helmholtz Centre for Ocean Research ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.