Platform: NOAA Twin Otter

When: 1 June – 15 July 2021

NOAA Twin Otter
Photo: B. Word

To support the overall AEROMMA science objectives related to coastal meteorology the NOAA Twin Otter aircraft will deploy to the New York City region.

The NOAA Twin Otter will study diurnal forcing of atmospheric dynamics on urban plume transport and mixing in coastal regions. Atmospheric effects such as the urban heat island and complex regional flow driven by sea/land breezes have a strong diurnal signature and impact the depth to which urban emission mix in the boundary layer and the coherence and direction of low- level transport in coastal regions. If these processes are not properly represented in regional air quality models, they will not accurately predict air quality in the region. An airborne scanning Doppler lidar will be used to make profile measurements of horizontal wind speed and vertical turbulence and mixing with sufficient resolution to characterize variations in these quantities over regional/urban scales represented by these models. Model performance will be evaluated by tracking the temporal and spatial evolution of the urban plume downwind of major northeast corridor urban centers (Baltimore/Washington, NYC, and Boston). Airborne, in-situ, gas phase concentrations of CO, CO2, O3, H2O, CH4 will be made to aid in air mass identification and to characterize the spatial extent of the plume. The airborne measurements will be augmented with those made by scanning Doppler lidars deployed in the area of study and greenhouse gas concentrations monitored by the NIST Greenhouse Gas Measurement Testbed and Mole Fraction Measurement Network - Northeast Corridor-Baltimore/Washington (NEC/BW).

NOAA's Aircraft Operations Center (AOC) in Lakeland, FL maintains and operates NOAA's aircraft assets. Among them are a De Havilland DHC-6-300 Twin Otter aircraft used for this study.

NOAA Twin Otter Instrument Payload