Black Sea biogeochemistry: Response to decadal atmospheric variability during 1960-2000 inferred from numerical modeling

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• 作者：Yunchang He^a ; ^{heychq0926@gmail.com} ; ^{yunchang.he@hzg.de} ; Emil V. Stanev^a ; Evgeniy Yakushev^b ; Joanna Staneva^a
• 关键词：Black Sea ; Biogeochemical model ; Atmospheric forcing ; Decadal variability ; Oxygen
• 刊名：Marine Environmental Research
• 出版年：2012
• 期刊代码：51_01411136
• 类别：env
• 出版时间：June, 2012
• 卷：77
• 期：Complete
• 页码：90-102
• 文件大小：2459 K

摘要

The long-term variability of the physical and biochemical structure of oxic and suboxic layers in the Black Sea was studied using a one-dimensional coupled hydrophysical and biogeochemical model. The focus was on the correlation between atmospheric forcing (2聽m air temperature and dew point temperature, surface level pressure, surface wind) affected by the North Atlantic Oscillation in and the regional responses. The quality of model performance was demonstrated using observed vertical and temporal distribution of biogeochemical variables. It was shown that during 1960-2000, the long-term variability of simulated winter-mean SST in the Black Sea correlated reasonably well with the variability of 2聽m air temperature. Furthermore, the thermal state of the upper ocean impacted largely on the variability of biogeochemical variables, such as oxygen, nitrate and phytoplankton concentration. The tele-connection between North Atlantic Oscillation and Black Sea biogeochemistry was manifested in a different way for the specific time-interval 1960-2000; the corresponding regime shifts were thus associated with the large scale forcing. One such extreme event occurred in 1976 leading to a pronounced shift in the oxygen and hydrogen sulfide state.