Airborne Microwave Observatory of Subcanopy and Subsurface (Airmoss)
Hydrology and Remote Sensing Laboratory
2012 Annual Report
1a.Objectives (from AD-416):
The overarching goal of the Airborne Microwave Observatory of Subcanopy and Subsurface (AirMOSS) project is to significantly reduce the current uncertainty in net ecosystem exchange (NEE) estimates of water and carbon over North America. AirMOSS will meet this challenge by providing high-resolution regional observations of Root Zone Soil Moisture (RZSM) over the major North American biomes. RZSM is defined here as the total moisture in the soil column from surface to the root zone. To measure RZSM, AirMOSS will build (from print) an ultra-high frequency (UHF) synthetic aperture radar (SAR) that has the capability to penetrate through substantial vegetation canopies and subsurface and retrieve information to the depths as large as 1.2m depending on the soil moisture content.
1b.Approach (from AD-416):
The project will build the AirMOSS sensor and deploy it during a serious of field experiments within the United States. Data sets derived from these experiments will then be assimilated into existing land surface models to improve our ability to track root-zone soil moisture and the net exchange of water carbon between agricultural landscapes and the atmosphere.
The ARS PI is tasked with generation of the Level 4 Root-Zone Soil Moisture (L4 RZSM) project for the Airborne Microwave Observatory of Subcanopy and Subsurface project (AirMOSS) mission. The L4 RZSM algorithm inputs non-continuous, 100-m pixel resolution Level 3 root-zone soil moisture (L3 RZSM) products and interpolates them into a continuous (hourly) 100-m resolution root-zone soil moisture product using a distributed hydrologic model and model calibration techniques. The ARS PI primary two Year 1 objectives were:
1) Constructing a prototype of the AirMOSS L4 RZSM system capable of successfully completing the AirMOSS project’s algorithm shake-down exercise in February 2012.
2) Completing an Algorithm Theoretical Basin Document (ATBD) for the product.
Both objectives were fully met and the project remains on schedule for all promised deliverables.