Progress and Developments in the Indianapolis Flux Experiment (INFLUX)

Friday, 19 December 2014: 10:20 AM
Paul B Shepson1, Maria Obiminda L Cambaliza1, Olivia Elizabeth Salmon1, Alexie M. F. Heimburger1, Kenneth J Davis2, Thomas Lauvaux3, Laura E McGowan4, Natasha Miles3, Scott Richardson2, Daniel P Sarmiento3, Michael Hardesty5, Anna Karion6, Colm Sweeney7, Laura T Iraci8, Patrick W Hillyard9, James Robert Podolske8, Kevin R Gurney10, Risa Patarasuk10, Igor N Razlivanov10, Yang Song10, Darragh O’Keeffe10, Jocelyn C Turnbull11, Isaac Vimont12, James R Whetstone13, Antonio Possolo13, Kuldeep Prasad13 and Israel Lopez-Coto13, (1)Purdue University, West Lafayette, IN, United States, (2)Penn State Univ, University Park, PA, United States, (3)Pennsylvania State University Main Campus, University Park, PA, United States, (4)University of California Davis, Davis, CA, United States, (5)NOAA Boulder, Boulder, CO, United States, (6)University of Colorado at Boulder, CIRES, Boulder, CO, United States, (7)NOAA Boulder, ESRL, Boulder, CO, United States, (8)NASA Ames Research Center, Moffett Field, CA, United States, (9)Bay Area Environmental Research Institute Moffett Field, Moffett Field, CA, United States, (10)Arizona State University, Tempe, AZ, United States, (11)GNS Science / Rafter Radiocarbon, Lower Hutt, New Zealand, (12)Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, United States, (13)National Institute of Standards and Technology Gaithersburg, Gaithersburg, MD, United States
Developments in the last year, including the President's new plan for reducing CO2 emissions by 30% by 2030, and the recent launch of OCO-2, provide more urgent incentive to develop reliable methods for determination of greenhouse gas emissions from urban environments. It is clear that the requirements for measurable, reportable, and verifiable emission rates for point sources and area sources, including individual urban environments, challenge the capabilities of the scientific community. The Indianapolis Flux Experiment (INFLUX) was established in 2010 as a multi-institution collaborative effort aimed at development of new tools for the measurement of greenhouse gas emissions from fine (~1km2) scale to urban area-wide scales, with accuracy and precision ideally approaching 10%. In the past year, INFLUX has seen a number of new developments and achievements. Among these are: expansion of the bottom-up emissions data product (Hestia) to include a wider domain and more contemporary years (up to 2012); new experiments to assess precision in the aircraft mass balance measurement for both CO2 and CH4; improved source apportionment for CH4 emission sources around the city, including quantitative measurements for several point sources; continued data acquisition for CO, CO2, CH4, and 14CO2 at 12 towers around the city; inverse modeling determinations of spatially resolved CO2 and CH4 fluxes relying in part on the updated Hestia emissions priors. We developed an improved understanding of the role of the biosphere in the urban CO2 measurements, observations of the "urban dome" column concentrations from a TCCON, and improved understanding of the temporal scale boundary layer dynamics from radiosonde launches, aircraft vertical profiles, and Doppler LIDAR measurements of winds and boundary layer heights. The INFLUX efforts are producing a relatively well-understood urban environment, which should provide a useful reference point for OCO-2 and other satellite-based determinations of greenhouse gas emission rates and trends in those rates. Here we will summarize the state of the INFLUX project and its achievements, and lay out some of the challenges to be tackled in the coming years.