Environmental conditions during phytoplankton blooms in the vicinity of James Ross Island, east of the Antarctic Peninsula
Environmental conditions during phytoplankton blooms in the vicinity of James Ross Island, east of the Antarctic Peninsula
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南极半岛东部詹姆斯罗斯岛附近浮游植物大量繁殖的环境条件
DOI：
10.1007/s00300-015-1670-7
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发表时间：
2015
期刊：
影响因子：
1.7
通讯作者：
M. Mata
中科院分区：
文献类型：
--
作者：
A. Detoni;M. S. Souza;C. Garcia;V. Tavano;M. Mata
在沃茨周围的詹姆斯罗斯岛（JRI），这是一般无法访问，高叶绿素a浓度[Chla]，往往可以检测到在夏季期间的海洋颜色图像。该地区受到威德尔海海冰边缘退缩和JRI冰川淡水径流的影响，这些因素可能引发浮游植物生长。在这项工作中，我们涉及浮游植物的组成和生物量[叶绿素a和碳]与环境因素在两个连续的夏末时期，在2008年（3月1日至3日）和2009年（2月17日至20日）。在这几天的取样中，利用遥感数据证实了调查结果。通过遥感和实地数据观测到高表面[Chla]斑块（2009年高达7.61毫克Chla m−3），并与相对较浅的上混合层（UML）相关（2008年为19-109米，2009年为16-74米）。2008年的海面温度（-1.19至-0.62 °C）低于2009年（-0.87至-0.46 °C）。2008年夏季的海冰覆盖率比2009年夏季大，这意味着2009年夏季海冰退缩的时间更早，当时从现场样本中获得的平均[Chla]更高（3.3 mg m−3，而2008年为1.5 mg m−3）。JRI的东面似乎相对地受到大范围西风的遮蔽。硅藻在浮游植物群落中占主导地位，存在大型硅藻物种（例如，典型的高级海冰融化条件。由于靠近该岛，这些水华是由一个浅的UML维持的，该UML与相对的避风港有关。
In waters surrounding James Ross Island (JRI), which is generally inaccessible, high chlorophyll-a concentration [Chla] can often be detected during summer periods by ocean color imagery. The region is influenced by a retreating sea ice edge from Weddell Sea and freshwater runoff from JRI glaciers, factors that probably trigger phytoplankton growth. In this work, we relate phytoplankton composition and biomass [Chla and carbon] with environmental factors in two successive late summer periods, in 2008 (1–3 March) and 2009 (17–20 February). Remote sensing data were used to corroborate the findings during those few sampling days. High surface [Chla] patches were observed through both remote sensing and field data (up to 7.61 mg Chla m−3 in 2009), and associated with a relatively shallow upper mixed layer (UML) (19–109 m in 2008 and 16–74 m in 2009). Sea surface temperatures were lower in 2008 (−1.19 to −0.62 °C) than in 2009 (−0.87 to −0.46 °C). Sea ice coverage was greater in 2008 than in 2009 summer, implying an earlier sea ice retreat in the latter year, when higher average [Chla] was obtained from field samples (3.3 mg m−3, compared to 1.5 mg m−3 in 2008). The eastern side of JRI appeared to be relatively sheltered from the dominant pattern of large-scale westerly winds. Diatoms dominated the phytoplankton community, with presence of large diatom species (e.g., Odontella weissflogii) typical of an advanced sea ice melt condition. Those blooms were sustained by a shallow UML associated with relative shelter from winds, due to proximity with the island.