This work presents the results of physical and biological investigations at 27 biogeochemical stations of early winter sea ice in the Ross Sea during the 2017 PIPERS cruise. Only two similar cruises occurred in the past, in 1995 and 1998. The year 2017 was a specific year, in that ice growth in the Central Ross Sea was considerably delayed, compared to previous years. These conditions resulted in lower ice thicknesses and Chl-a burdens, as compared to those observed during the previous cruises. It also resulted in a different structure of the sympagic algal community, unusually dominated by Phaeocystis rather than diatoms. Compared to autumn-winter sea ice in the Weddell Sea (AWECS cruise), the 2017 Ross Sea pack ice displayed similar thickness distribution, but much lower snow cover and therefore nearly no flooding conditions. It is shown that contrasted dynamics of autumnal-winter sea-ice growth between the Weddell Sea and the Ross Sea impacted the development of the sympagic community. Mean/median ice Chl-a concentrations were 3–5 times lower at PIPERS, and the community status there appeared to be more mature (decaying?), based on Phaeopigments/Chl-a ratios. These contrasts are discussed in the light of temporal and spatial differences between the two cruises.

中文翻译：

---

罗斯海初冬南极海冰的物理和生物学特性

这项工作展示了 2017 年 PIPERS 巡航期间罗斯海 27 个初冬海冰生物地球化学站的物理和生物学调查结果。过去仅在 1995 年和 1998 年发生过两次类似的航行。2017 年是一个特殊的年份，与往年相比，罗斯海中部的冰层增长明显延迟。这些条件导致较低的冰厚度和 Chl-一种与之前的航行中观察到的负担相比。它还导致了同心藻群落的不同结构，异常地由褐藻属而不是硅藻。与威德尔海的秋冬海冰（AWECS 巡航）相比，2017 年罗斯海的浮冰显示出相似的厚度分布，但积雪要低得多，因此几乎没有洪水条件。结果表明，威德尔海和罗斯海之间秋冬季海冰生长的对比动态影响了同感群落的发展。平均/中值冰 Chl-一种PIPERS 的浓度比 PIPERS 低 3-5 倍，根据 Phaeopigments/Chl- ，那里的群落状态似乎更成熟（腐烂？）一种比率。这些对比是根据两个游轮之间的时间和空间差异来讨论的。