The Potential of Using Microwave Emission in Detecting Freeze and Thaw States
Abstract
The technical objective of the proposed effort is to explore the use of microwave emissivity to enhance freeze/thaw transitions and predictions. The proposed effort seeks to achieve the stated technical objective by seeking to utilize passive microwave emissivity, since such an approach is expected to have significant advantages over the traditional direct use of brightness temperature information in the analysis of freeze/thaw states. Emissivity values are expected to provide uniquely valuable information about the state of the surface since the dielectric constant of the surface changes significantly during the freeze/thaw process. More specifically, the proposed effort will develop an emissivity database from 7 GHz to 90 GHz and utilize emissivities with finer temporal resolution to provide an enhanced characterization of freeze and thaw states analysis. The work will examine the inter-consistency of the different passive microwave sensors by using the constellation of polar orbiting satellite sensors, and will seek to remove the effect of the penetration depth of the inconsistency between infrared and passive microwave in emissivity estimates using diurnal variation of microwave brightness temperature. The effort will also assess the estimated freeze/thaw product with independent satellite- and ground-based observations. The variability of land emissivity as well as freeze/thaw states will be investigated through suitable statistical analysis for different land cover types.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1510070
Entities
People
- Hamidreza Norouzi
Organizations
- Army Contracting Command
- New York City College of Technology
- United States Army