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South Caspian vertical circulation during rapid sea level rise and fall | ||
| Caspian Journal of Environmental Sciences | ||
| دوره 19، شماره 1، فروردین 2021، صفحه 19-29 اصل مقاله (1.42 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22124/cjes.2021.4304 | ||
| نویسندگان | ||
| Mirmahmood Seyedvalizadeh1؛ Hamid Alizadeh Ketek Lahijani1؛ Seyed Mostafa Siadatmousavi2 | ||
| 1Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran | ||
| 2School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran | ||
| چکیده | ||
| The Caspian Sea as the largest land-locked water body is very sensitive to the environmental changes. The rise and fall of the Caspian Sea level has significant impact on the environment and coastal communities. Using extensive deep water measurements in the south Caspian Sea, we have examined the role of sea level changes on the vertical water exchange. While the deep water ventilation happened during sea level fall (70s of 20 century), coastal lagoon expansion and marine stagnant circulation state were the major impacts during rapid sea level rise (1980-1995). The marine environment however benefits the rapid sea level fall. During sea level fall, vertical circulation penetrates deeper and faster which distributes oxygen and nutrient more effectively in the water column. It provides the condition for enhanced bio-productivity. However, the current global warming could prevent the impact of lowstand to faster circulation. The present rapid sea level fall displays new impacts on the marine environment, reflecting as hypoxia. | ||
| کلیدواژه‌ها | ||
| Deep water circulation؛ Caspian water masses؛ water ventilation | ||
| مراجع | ||
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