Information Content and Uncertainties in Thermodynamic Profiles Retrieved from the Ground-Based Atmospheric Emitted Radiance Interferometer
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| Title: | Main Title: Information Content and Uncertainties in Thermodynamic Profiles Retrieved from the Ground-Based Atmospheric Emitted Radiance Interferometer |
| Description: | Abstract: The Atmospheric Emitted Radiance Interferometer (AERI) observes spectrally resolved downwelling radiance emitted by the atmosphere in the infrared portion of the electromagnetic spectrum. Profiles of temperature and water vapor, and cloud liquid water path and effective radius for a single liquid cloud layer, are retrieved using an optimal estimation based physical retrieval algorithm from AERI-observed radiance data. This algorithm provides a full error covariance matrix for the solution, and both the degrees of freedom for signal and the Shannon information content. The algorithm is evaluated both with synthetic and real AERI observations. The AERI is shown to have approximately 85% and 70% of its information in the lowest 2 km of the atmosphere for temperature and water vapor profiles, respectively. In clear sky situations, the mean bias errors with respect to the radiosonde profiles are less than 0.2 K and 0.3 g/kg for heights below 2 km for temperature and water vapor mixing ratio, respectively; the maximum root mean square errors are less than 1 K and 0.8 g/kg. The errors in the retrieved profiles in cloudy situations are larger, due in part to the scattering contribution to the downwelling radiance that was not accounted for in the forward model. However, scattering is largest in one of the spectral regions used in the retrieval, and removing this spectral region results in a slight reduction of the information content but a considerable improvement in the accuracy of the retrieved thermodynamic profiles. |
| Identifier: | 10.1175/JAMC-D-13-0126.1 (DOI) |
Responsible Party
| Creators: | David Turner (Author), Ulrich Löhnert (Author) |
| Publisher: | American Meteorological Society |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Atmosphere |
| Related Subproject: | D2 |
| Subject: | Keyword: Atmospheric Measurement |
File Details
| Filename: | 2013_Turner_JAMC.pdf |
| Data Type: | Text - Article |
| Size: | 59 Pages |
| File Size: | 4 MB |
| Date: | Available: 05.12.2013 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | For internal use only |
| Access Limitations: | For internal use only |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Publication
| Publication Status: | Accepted |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Journal of Applied Meteorology and Climatology |
| Source Website: | www.journals.ametsoc.org |
| Number of Pages: | 59 (1 - 59) |
Metadata Details
| Metadata Creator: | Ulrich Löhnert |
| Metadata Created: | 10.12.2013 |
| Metadata Last Updated: | 10.12.2013 |
| Subproject: | D2 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 762 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 4 |
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