Coordinated Airborne Studies in the Tropics (CAST) is focused on studying the chemical and physical properties of the tropical tropopause layer (TTL) and their impacts in controlling the composition of the upper troposphere, lower stratosphere (UTLS). This mission will focus on the Western Pacific Warm Pool region. Convective transport of very short and long-lived chemical species will be measured together with tropospheric moist convective dynamic processes in this important but data sparse region.
The research will be delivered in partnership with NASA through collaboration with the NASA Earth Venture ATTREX1 (Airborne Tropical Tropopause Experiment) mission deploying the NASA Global Hawk unmanned aerial vehicle (UAV). This project will be in support of the NERC programme “Observations and modelling of the tropical tropopause layer”. We will also be working in collaboration with NCAR’s CONTRAST (CONvective TRansport of Active Species in the Tropics) campaign using their GV aircraft.
- Plan and implement a coordinated measurement campaign involving the NASA Global Hawk, NCAR GV, the FAAM BAe146 and balloon-borne sondes in the Tropical Warm Pool region of the West Pacific
- Measure VSL (very short lived) halocarbons in situ on the 146 along with 2 years of continuous VSL halocarbon measurements at Chuuk and an extension of the ground-based tropical VSL halocarbon measurement network
Figure 1. Schematic showing the CAST campaign with each aircraft’s measurement capabilities.