Quantification of oil and gas methane emissions in the Delaware and Marcellus basins using a network of continuous tower-based measurements

According to the United States Environmental Protection Agency (US EPA), emissions from oil and gas infrastructure contribute 30 % of all anthropogenic methane (CH4) emissions in the US. Studies in the last decade have shown emissions from this sector to be substantially larger than bottom-up assessments, including the EPA inventory, highlighting both the increased importance of methane emissions from the oil and gas sector in terms of their overall climatological impact and the need for independent monitoring of these emissions. In this study we present continuous monitoring of regional methane emissions from two oil and gas basins using tower-based observing networks. Continuous methane measurements were taken at four tower sites in the northeastern Marcellus basin from May 2015 through December 2016 and five tower sites in the Delaware basin in the western Permian from March 2020 through April 2022. These measurements, an atmospheric transport model, and prior emission fields are combined using an atmospheric inversion to estimate monthly methane emissions in the two regions. This study finds the mean overall emission rate from the Delaware basin during the measurement period to be 146–210 Mg CH4 h-1 (energy-normalized loss rate of 1.1 %–1.5 %, gas-normalized rate of 2.5 %–3.5 %). Strong temporal variability in the emissions was present, with the lowest emission rates occurring during the onset of the COVID-19 pandemic. Additionally, a synthetic model–data experiment performed using the Delaware tower network shows that the presence of intermittent sources is not a significant source of uncertainty in monthly quantification of the mean emission rate. In the Marcellus, this study finds the overall mean emission rate to be 19–28 Mg CH4 h-1 (gas-normalized loss rate of 0.30 %–0.45 %), with relative consistency in the emission rate over time. These totals align with aircraft top-down estimates from the same time periods. In both basins, the tower network was able to constrain monthly flux estimates within ±20 % uncertainty in the Delaware and ±24 % uncertainty in the Marcellus. The results from this study demonstrate the ability to monitor emissions continuously and detect changes in the emissions field, even in a basin with relatively low emissions and complex background conditions.

Methane, carbon dioxide, hydrogen sulfide, and isotopic ratios of methane observations from the Permian Basin tower network

We describe the instrumentation, calibration, and uncertainty of the network of ground-based, in situ, cavity ring down spectroscopy (CRDS) greenhouse gas (GHG) measurements deployed in the Permian Basin. The primary goal of the network is to be used in conjunction with atmospheric transport modeling to determine methane emissions of the Delaware sub-basin of the Permian Basin oil and natural gas extraction area in Texas and New Mexico. Four of the measurements are based on tall communications towers, while one is on a building on a mountain ridge, with the recent addition of a small tower at that site. Although methane (CH4) is the primary species of interest, carbon dioxide (CO2), hydrogen sulfide (H2S), and the isotopic ratio of methane (δ13CH4) are also reported for a subset of the sites. Measurements were reported following the WMO X2004A scale for CH4 and the WMO X2019 scale for CO2. CRDS instruments were calibrated for CH4 andCO2 in the laboratory prior to deployment. For H2S, data were offset-corrected using the minimum 40 min running mean value of the day, and for δ13CH4, calibrations were based on laboratory data. We describe the characteristics of the dataset with a set of illustrative analyses. Methane and carbon dioxide showed strong seasonality, with a well-defined diurnal cycle during the summer, which was opposed to the winter, when a diurnal cycle was absent. CH4 enhancements to the background, during the winter, are up to twice the summer values, which is attributed to the changes in boundary layer depth and wind speed. The largest CH4 enhancements occurred when winds blow from the center of the Delaware sub-basin, where most of the methane emissions come from. The magnitude of enhancements of CO2 did not present seasonality. H2S enhancements indicated a potential source northeast of the tower (Hobbs, New Mexico) where the inlet is installed. Isotopic ratios of methane indicated that oil and natural gas extraction is the source of local methane in the region. The hourly-averaged data, starting on 1 March 2020 and described in this paper, are archived at The Pennsylvania State University Data Commons at 10.26208/98y5-t941 (Monteiro et al., 2021).

Concurrent variation in oil and gas methane emissions and oil price during the COVID-19 pandemic

Methane emissions associated with the production, transport, and use of oil and natural gas increase the climatic impacts of energy use;however, little is known about how emissions vary temporally and with commodity prices. We present airborne and ground-based data, supported by satellite observations, to measure weekly to monthly changes in total methane emissions in the United States' Permian Basin during a period of volatile oil prices associated with the COVID-19 pandemic. As oil prices declined from ∼ USD 60 to USD 20 per barrel, emissions changed concurrently from 3.3 % to 1.9 % of natural gas production;as prices partially recovered, emissions increased back to near initial values. Concurrently, total oil and natural gas production only declined by∼ 10 % from the peak values seen in the months prior to the crash. Activity data indicate that a rapid decline in well development and subsequent effects on associated gas flaring and midstream infrastructure throughput are the likely drivers of temporary emission reductions. Our results, along with past satellite observations, suggest that under more typical price conditions, the Permian Basin is in a state of overcapacity in which rapidly growing associated gas production exceeds midstream capacity and leads to high methane emissions.

African American Breastfeeding Peer Support: All Moms Empowered to Nurse.

Background: Although breastfeeding is optimal infant nutrition, disparities in breastfeeding persist in the African American population. AMEN (Avondale Moms Empowered to Nurse) launched a Peer-to-Peer support group to increase breastfeeding initiation and duration in an under-resourced African American urban community with low breastfeeding rates. Materials and Methods: A Community-Based Participatory Research (CBPR)-guided project was developed in partnership with a neighborhood church. Using modified Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) peer counseling materials, Avondale neighborhood breastfeeding moms were trained and designated Breastfeeding Champions. Community organizations and partnering agencies helped recruit local mothers. Support groups included childcare, transportation, refreshments, and incentives, plus stipends for Champions. A mixed-methods approach captured participation, feeding intention and practices, and program evaluation using electronic data capture. After adding another neighborhood with low breastfeeding rates, AMEN was modified to "All Moms Empowered to Nurse." Additional Champion moms were trained as Reaching Our Sisters Everywhere (ROSE) Community Transformers. During the COVID-19 pandemic, the group has met weekly by virtual platform. Results: Since May 2017, 67 AMEN support meetings have included 158 participants, with average attendance of 10 (range 5-19) per meeting. In addition to 8 Champions, 110 moms have attended, including 24% expecting mothers. Additional attendees include 13 family support persons, 23 guest speakers, and 12 from community outreach programs. Qualitative feedback from participants has been uniformly positive. Breastfeeding initiation rates have increased 12% in the initial neighborhood. Conclusions: Harnessing strength within the local community, Champion Breastfeeding Moms have successfully launched AMEN breastfeeding support groups in under-resourced African American urban neighborhoods, helping more mothers reach their breastfeeding goals.