Distribution of net community production and surface pCO2 in the Scotia Sea, Antarctica, during austral spring 2001'
Distribution of net community production and surface pCO2 in the Scotia Sea, Antarctica, during austral spring 2001'
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2001 年南方春季期间南极洲斯科舍海的净群落生产量和表面 pCO2 分布
DOI：
10.1016/j.marchem.2005.12.007
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发表时间：
2006
期刊：
影响因子：
3
通讯作者：
Sang
中科院分区：
文献类型：
--
作者：
J. Shim;Y. Kang;Dongseon Kim;Sang
2001年12月在斯科舍海进行了pCO 2、碱度和营养物的表面和水柱测量。沿着52°W，从54°S到60°S，表层海水中pCO 2、TCO 2和营养盐含量向南增加。pCO 2浓度范围从370？北部的ATM到420？atm在南部和突然增加跨越极地和斯科舍前线约10？20个？大气压从前一个冬天的观测时间净群落生产值计算在南北极站锋;值范围从1.0？1.2摩尔m-2，并与其他南大洋测量在夏季，或在藻华。影响表面pCO 2分布的过程（例如，空气中的化学变化？海洋交换、生物生产和物理混合）进行了评估。季节性变暖增加表面pCO 2在0.08至0.27？atm d-1;最高值出现在最靠近极锋的站点。空气？海水交换使表层pCO 2以-0.08 ~-0.23？atm d-1，表明研究站周围的地区作为一个弱的CO2源在研究期间。由生物生产引起的表面pCO 2变化为-0.24至-0.30？atm d-1和高南部的斯科舍锋，叶绿素a，生物量和颗粒铁的浓度相对较高。物理混合促进了0.16至0.47？atm d-1的表面pCO 2，pCO 2的总变化的实质性贡献。这一结果与南大洋其他区域的模式形成对比，在这些区域，物理混合被认为是最小的，或者在以前的研究中被忽略。在威德尔-斯科舍汇流区的WS 8站，混合是研究期间表面pCO 2变化的主要过程，表明威德尔河富CO2水团的横向和垂直输送
Surface and water column measurements of pCO2, alkalinity, and nutrients were made in the Scotia Sea in December 2001. From 54°S to 60°S along 52°W, pCO2, TCO2, and nutrients in surface seawater increased southward. The pCO2 concentration ranged from 370 ?atm in the north to 420 ?atm in the south and increased abruptly across the Polar and Scotia fronts by about 10?20 ?atm. Net community production values from the preceding winter to the observation time were calculated at stations south of the Polar Front;values ranged from 1.0?1.2 mol m-2 and were comparable to other Southern Ocean measurements in summer, in or during an algal bloom. Processes affecting the surface pCO2 distribution (e.g., thermodynamical change, air?sea exchange, biological production, and physical mixing) were evaluated from the preceding winter to the observation time at the stations. Seasonal warming increased surface pCO2 at rates of 0.08 to 0.27 ?atm d-1;the highest values were observed at the station closest to the Polar Front. The air?sea exchange decreased surface pCO2 at rates of -0.08 to -0.23 ?atm d-1, suggesting that the area around the study stations acted as a weak CO2 source during the study period. The surface pCO2 variation caused by biological production was -0.24 to -0.30 ?atm d-1 and was high south of the Scotia Front, where concentrations of chlorophyll a, biomass, and particulate Fe were relatively high. Physical mixing promoted an increase of 0.16 to 0.47 ?atm d-1 in surface pCO2, a substantial contribution to total variation in pCO2. This result contrasts with patterns in other Southern Ocean regions, where physical mixing was considered to be minimal or was ignored in previous studies. At station WS 8 in the Weddell-Scotia Confluence region, mixing was the dominant process of surface pCO2 change during the study period, suggesting lateral and vertical transport of CO2-rich water masses from the Weddell