dorsal/arxiv
View SchemaHumidity contribution to C_n^2 over a 600m pathlength in a tropical marine environment
| Authors | Mark P. J. L. Chang, Carlos O. Font, G. Charmaine Gilbreath, Eun Oh |
|---|---|
| Categories | |
| ArXiv ID | physics/0701022 |
| URL | https://arxiv.org/abs/physics/0701022 |
| DOI | 10.1117/12.717948 |
Abstract
We present new optical turbulence structure parameter measurements, C_n^2, over sea water between La Parguera and Magueyes Island (17.6N 67W) on the southwest coast of Puerto Rico. The 600 meter horizontal paths were located approximately 1.5 m and 10 m above sea level. No data of this type has ever been made available in the literature. Based on the data, we show that the C_n^2 measurements are about 7 times less compared to equivalent land data. This strong evidence reinforces our previous argument that humidity must be accounted for to better ascertain the near surface atmospheric turbulence effects, which current visible / near infrared C_n^2 bulk models fail to do. We also explore the generalised fractal dimension of this littoral data and compare it to our reference land data. We find cases that exhibit monofractal characteristics, that is to say, the effect of rising temperatures during the daylight hours upon turbulence are counterbalanced by humidity, leading to a single characteristic scale for the measurements. In other words, significant moisture changes in the measurement volume cancels optical turbulence increases due to temperature rises. Figures available as JPG only.
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"abstract": "We present new optical turbulence structure parameter measurements, C_n^2,\nover sea water between La Parguera and Magueyes Island (17.6N 67W) on the\nsouthwest coast of Puerto Rico. The 600 meter horizontal paths were located\napproximately 1.5 m and 10 m above sea level. No data of this type has ever\nbeen made available in the literature. Based on the data, we show that the\nC_n^2 measurements are about 7 times less compared to equivalent land data.\nThis strong evidence reinforces our previous argument that humidity must be\naccounted for to better ascertain the near surface atmospheric turbulence\neffects, which current visible / near infrared C_n^2 bulk models fail to do. We\nalso explore the generalised fractal dimension of this littoral data and\ncompare it to our reference land data. We find cases that exhibit monofractal\ncharacteristics, that is to say, the effect of rising temperatures during the\ndaylight hours upon turbulence are counterbalanced by humidity, leading to a\nsingle characteristic scale for the measurements. In other words, significant\nmoisture changes in the measurement volume cancels optical turbulence increases\ndue to temperature rises. Figures available as JPG only.",
"arxiv_id": "physics/0701022",
"authors": [
"Mark P. J. L. Chang",
"Carlos O. Font",
"G. Charmaine Gilbreath",
"Eun Oh"
],
"categories": [
"physics.ao-ph",
"physics.optics"
],
"doi": "10.1117/12.717948",
"title": "Humidity contribution to C_n^2 over a 600m pathlength in a tropical marine environment",
"url": "https://arxiv.org/abs/physics/0701022"
},
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