Trends and variability in spectral diffuse attenuation of coral reef waters
| العنوان: | Trends and variability in spectral diffuse attenuation of coral reef waters |
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| المؤلفون: | Eric J. Hochberg, Stéphane Maritorena, Stacy A. Peltier |
| المصدر: | Coral Reefs. 39:1377-1389 |
| بيانات النشر: | Springer Science and Business Media LLC, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | 0106 biological sciences, geography, geography.geographical_feature_category, Range (biology), 010604 marine biology & hydrobiology, Irradiance, Coral reef, Aquatic Science, 010603 evolutionary biology, 01 natural sciences, Oceanography, Water column, Downwelling, Dissolved organic carbon, Submarine pipeline, Reef, Geology |
| الوصف: | Knowledge of water clarity is an essential component of coral reef ecology. While qualitative trends are well known, there are currently few published records of spectral—varying as a (relatively) continuous function of wavelength—water optical properties for these systems. The purpose of this study is to quantify trends in the range and variability of the spectral diffuse attenuation coefficient (Kd) in coral reef and adjacent waters. Using a Biospherical PRR-800, 199 vertical profiles of downwelling spectral irradiance were collected across the reefs and nearby optically deepwaters of Bermuda and Hawaii. A single spectral Kd was calculated for each profile. Results reveal water types ranging from clear oceanic to turbid coastal, with Bermuda and Hawaii showing similar patterns. Kd roughly correlates with reef geomorphic zonation, consistent with well-known reef water characteristics: (a) Suspended sediments are ubiquitous on coral reef flats and in lagoons, chiefly comprising calcium carbonate, which is effectively spectrally flat and has the effect of increasing the overall magnitude of Kd; (b) reefs generate large amounts of dissolved organic matter, which becomes apparent in some lagoonal Kd; and (c) the Kd data exhibit little indication of chlorophyll, which is typically very low in the water column above reefs. These patterns appear reproducible when compared with prior data from French Polynesia. The depth of the 1% light level varies accordingly, approximately 30 m, 45 m, 75 m, and 105 m for lagoon, reef flat, fore reef, and offshore, respectively. The data presented here provide some insight into trends in the spatial context of reef geomorphology and lay the foundation for a more quantitative understanding of reef water clarity and color and their importance to reef ecology. |
| تدمد: | 1432-0975 0722-4028 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::433f1f7567665d52e1fa8989e6e730bc https://doi.org/10.1007/s00338-020-01971-1 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........433f1f7567665d52e1fa8989e6e730bc |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14320975 07224028 |
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