Mean Offshore Refractive Conditions during the CASPER East Field Campaign
| Autor: | Denny P. Alappattu, Marcela Ulate, Teddy Holt, Qing Wang, Tracy Haack |
|---|---|
| Přispěvatelé: | Naval Postgraduate School (U.S.) |
| Rok vydání: | 2019 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Meteorology 020206 networking & telecommunications 02 engineering and technology 01 natural sciences Atmosphere Boundary layer 0202 electrical engineering electronic engineering information engineering Atmospheric duct Submarine pipeline Field campaign Geology 0105 earth and related environmental sciences |
| Popis: | The article of record as published may be found at http://dx.doi.org/10.1175/JAMC-D-18-0029.1 In this study, we use observational and numerical model data from the Coupled Air Sea Processes and Electromagnetic Ducting Research (CASPER) field campaign to describe the mean refractive conditions offshore Duck, North Carolina. The U.S. Navy operational numerical weather prediction model known as the Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) performed well forecasting large-scale conditions during the experiment, with an observed warm bias in SST and cold and dry biases in temperature and humidity in the lowest 2000 m. In general, COAMPS underpredicted the number of ducts, and they were weaker and at lower height than those seen in observations. It was found that there is a noticeable diurnal evolution of the ducts, more over land than over the ocean. Ducts were found to be more frequent over land but overall were stronger and deeper over the ocean. Also, the evaporative duct height increases as one moves offshore. A case study was chosen to describe the electromagnetic properties under different synoptic conditions. In this case the continental atmospheric boundary layer dominates and interacts with the marine atmospheric boundary layer. As a result, the latter moves around 80 km offshore and then back inland after 2 h. Coupled Air–Sea Processes and Electromagnetic Ducting Research (CASPER); Office of Naval Research (ONR) under Multidisciplinary University Research Initiative (MURI) Office of Naval Research (ONR) N0001418WX01087 N0001417WX02083 |
| Databáze: | OpenAIRE |
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