Dr. Tilden Meyers Presents Seminar
Highlighting 20+ Years of Data and Modeling Results
Dr. Tilden Meyers, Acting Chief Scientist for Climate Programs at ARL’s Atmospheric Turbulence and Diffusion Division, presented a seminar on 18 April titled, “Using a calibrated land-surface model for gap-filling energy, carbon, and water fluxes.” The seminar, open to colleagues across all four divisions of ARL, served as a culmination of multiple factors as Meyers moves toward publication of his findings.
The session began with the observation that long-term monitoring of energy, carbon, and water fluxes always requires a gap-filling strategy when examining seasonal and annual water and carbon fluxes. In most cases, data gaps are either prorated for a given time period or relationships between variables are formed to provide estimates of the missing variables and are site specific. Dr. Meyers discussed how site specific information can be used in a two-source (soil and canopy) land surface model to provide estimates of not only energy and carbon fluxes, but also of soil temperatures and moisture, leaf area index, and turbulence scaling parameters. He went on to explain that the two-source model also provides an opportunity evaluate the contributions of water and carbon fluxes from the soil and canopy over the growing season, and he provided details on how site specific information was used in modeling.
Dr. Meyers has spent the last 33 years of his career at ATDD. His primary focus is land-atmosphere interactions, which includes delving into both atmospheric science and micrometeorology. Over the last 20+ years, Dr. Meyers has continually performed highly-technical activities, amassing a large collection of data and observations. He was excited to explain how he’s compiled a novel way to fill in data utilizing a model that’s been calibrated against his observations, especially since it’s taken the last few years to assemble the model’s components.
As a dedicated scientist, Meyers was eager to share the “nuts and bolts” of his efforts – what went in, what he learned, and results that he obtained; especially the part where the model matched his measurements. Sharing his work, he believes, may help others in the modeling community. He’s happy to share the various sub-models that were used and is hoping to get constructive feedback from colleagues on these findings. When asked to summarize his findings, Dr. Meyers noted, “Observations of land-atmosphere exchanges of water, heat, and carbon dioxide were used to derive land surface model (LSM) parameterizations. The derived relationships, coupled with the LSM, were able to provide estimates of heat, water and carbon fluxes that could be used to fill data gaps since continuous data records are necessary for providing seasonal and annual summations of both carbon and water budgets.”
Flux Tower in soybean field in
Bondville, Illinois (circa 2009)
Flux Tower in soybean field in
Bondville, Illinois (present)
Bondville soybean crop nearing full leaf out
Field Study Performed on eMote Sensors
On April 5, 2018, Temple Lee, Ed Dumas, and Michael Buban conducted a field study to evaluate the performance of four eMote sensors from ManoNano Technologies. The tests were conducted at the House Mountain Radio Control field located approximately 20 km northeast of Knoxville, Tennessee.
When large numbers of eMotes are released from a fixed-wing aircraft, small Unmanned Aircraft System (sUAS), or balloon, they can be used to follow the airflow and can ultimately provide important information about the three-dimensional temperature, moisture, and wind fields by transmitting these data to a ground-based receiver.
The test consisted of releasing the eMotes from ATDD’s DJI S-1000 sUAS at heights ranging from 50 – 150 m above ground level. The data from the eMotes was compared with temperature and humidity measurements obtained from the iMet-XQ sensors installed on-board the sUAS. Another set of measurements were obtained from a tethered balloon that lofted one Graw T/RH sensor and three iMet-XQ2 sensors to altitudes of 150, 100, 75, and 50 m, respectively.
These tests revealed that the eMotes have a warm and dry bias, and also indicated problems with their on-board GPS. These results will help motivate improvements in the sensor’s design and data acquisition systems.
Equipment used during the test.
Tethered balloon is aloft to the left of this image.
Ed Dumas with DJI S-1000 sUAS
Monique Baskin visits ATDD
On March 1, 2018, ATDD hosted a climate briefing for Monique Baskin, Climate Portfolio Policy Advisor in OAR’s Office of Policy, Planning and Evaluation.
The goal of the briefing was to highlight ATDD’s climate research and development activities for the last five years.
ATDD Director Dr. Bruce Baker provided an overview of the climate research and engineering efforts. Mark Hall, Senior Engineer for US Climate Reference Network (USCRN) provided an overview of the history of USCRN and of the site installations and maintenance program.
- Dr. Tilden Meyers on past and present collaborations between ATDD and other OAR labs with future directions for research and development;
- Dr. John Kochendorfer, Precipitation Testbed studies and results;
- Dr. Tim Wilson, USCRN Soil Moisture Testbed;
- and Dr. Praveena Krishnan, Intercomparison of Land Surface Temperatures.
Ms. Baskin also toured ATDD’s Surface Energy Budget Network (SEBN) site at Chestnut Ridge (pictured on the right), the USCRN site at ATDD, and, USCRN engineering research and development, and maintenance facilities.
Ms. Baskins is briefed on the
Surface Energy Budget Network site
ATDD extends welcome to Dr. Kelsey Ellis, UTK Visiting Scientist
Dr. Ellis will spend a few months working at ATDD while on sabbatical from the University of Tennessee, Knoxville (UTK), where she is an Assistant Professor in the Department of Geography and has research interests in natural hazards (i.e., tropical cyclone climatology, tornadoes climatology, risk and vulnerability analyses, historical reconstructions, and spatial climatologies) and human-environment interactions (i.e., microclimates, land use-atmosphere interaction, climate-suicide relationships, and urban microenvironments).
While at ATDD, she will work with Drs. Bruce Baker, Temple Lee, Michael Buban, and others on research and analyses of datasets obtained during the recent Verification of the Origins of Rotation in Tornadoes Experiment in the Southeast U.S. (VORTEX-SE) campaign. They will explore new ways to use these datasets and will also explore joint funding opportunities. In addition, Kelsey will work with the group on analyses of datasets obtained during the Land-Atmosphere Feedback Experiment (LAFE), focusing on analyses of remotely-sensed land surface data from aircraft operated during the experiment. These, as well as work on other research topics, will strengthen collaborations between UTK and ATDD.
For more information on Dr. Ellis, please visit her UTK web page.
Dr. Kelsey Ellis is greeted by Dr. LaToya Myles
ESRL and ARL scientists meet in Boulder, Colorado
Scientists from Headquarters Air Resources Laboratory (ARL) and the Atmospheric Turbulence and Diffusion Division (ATDD – a division of ARL) met with Earth System Research Laboratory (ESRL) scientists in Boulder, Colorado, January 17-18, 2018 for a collaborative strategy session. There were three primary goals for this meeting:
- to exchange information on current air chemistry research at each of the labs;
- to discuss short-term and long-term plans to utilize air chemistry research to support NOAA core missions and educate NOAA Oceanic and Atmospheric Research (OAR) management about the importance of air chemistry research to NOAA’s missions;
- and to explore potential opportunities for collaboration (i.e. joint projects, proposals, interactions with OAR programs).
Following the presentation of lab overviews to the entire group, participants divided into three subgroups to participate in concurrent sessions related to their respective areas of specialty:
- air chemistry,
- and Climate Reference Network/boundary layer processes.
Each of the three topic areas had its own full agenda, complete with a lengthy slate of five-minute “lightning talks” on projects, personal interests, and suggested collaborations, followed by more in-depth, focused discussions. The entire group then reconvened Thursday afternoon to hear a summary of each working group’s interactions and to discuss strategies and next steps.
Discussions are continuing about the potential collaborative topics identified in the meeting.
For more information on ESRL research please visit their website.
The ARL website can be accessed here.
Air pollution within the boundary layer over a city
NOAA Center for Atmospheric Science personnel
meet with ATDD scientists
On Thursday, 5 October, scientists at ATDD hosted a visit by a group of personnel representing NOAA Center for Atmospheric Science (NCAS). The meeting was held to explore potential collaborative research between NCAS members and ATDD. Attending from NCAS were Dr. Vernon Morris, Director and Principal Investigator and Ricardo Sakai, Research Associate from Howard University, and Dr. Jose Fuentes from Penn State University. Kafayat Olayinka, a graduate student from Howard University, and Zachary Moon, a graduate student from Penn State, were also in attendance. Presentations were made by staff from both NCAS and ATDD to provide background on current research activities and personnel involved. Part of the visit included a short field trip to Knox County Radio Control field to demonstrate the DJI 1000, one of the drones in ATDD’s UAS fleet. Potential collaborative research projects were discussed with follow-up discussions planned in the near future.
NCAS and ATDD personnel
Back row: Dr. LaToya Myles, Zachary Moon, Dr. Rick Saylor, Dr. Bruce Baker, Dr. Temple Lee, Dr. Michael Buban, Dr. Nebila Lichiheb, Edward Dumas, Dr. Praveena Krishnan, Kafayat Olayinka
Front row: Dr. Ricardo Sakai, Dr. Tilden Meyers, Dr. Jose Fuentes, Dr. Vernon Morris
For more information about the NCAS program, visit their website.
ATDD UAS In-flight
Ed Dumas, ATDD UAS Pilot, shows Dr. Jose Fuentes a new location for the iMet-XQ temperature, relative humidity, and pressure sensor on the DJI S-1000 small UAS
ATDD-UTK identify opportunities for new partnerships
On September 12, 2017, ATDD and the University of Tennessee Knoxville (UTK) held a science workshop at the Cherokee Farm Innovation Campus and Research Park. The goal of the workshop was to foster collaborations that advance research, technology, and education in weather, climate and air chemistry. Dr. Bruce Baker (ATDD Director), Dr. Stacey Patterson (UTK Interim Vice President of Research, Outreach, and Engagement) and Dr. Robert Nobles (UTK Interim Vice Chancellor for Research and Engagement) hosted the workshop. University researchers and ATDD scientists delivered research presentations and engaged in round-table discussions to identify opportunities for new partnerships. This workshop is a first step under the recent Memorandum of Agreement between ATDD and UTK.
Attendees to ATDD-UTK meeting
From left to right:
Dr. Bruce Baker, Dr. Stacey Patterson,
Dr. Robert Nobles
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