Vertical microalgae fluxes at the mooring station LOMO-2 over the Lomonosov Ridge in the period from September 15, 1995 till August 16, 1996

The first studies of microalgae fluxes over the Lomonosov Ridge in the northern Laptev Sea were carried out with a sediment trap at the year-long mooring station LOMO-2, installed at 150 m depth from September 15, 1995 to August 16, 1996. These studies demonstrated essential seasonal variations of vertical microalgae flux. It was shown that in summer diverse flora (composed mainly of cryophylic diatoms) growed intensively beneath the permanent ice cover. Strongly pronounced seasonal variations of microalgae growth correlate closely with solar radiation. Exactly during the maximum insolation period, from the middle of July until the end of September, the microalgae flux was hundreds of times higher than that in the rest of the year. Summer values of the microalgae flux over the Lomonosov Ridge in the northern Laptev Sea were similar to those in the Weddell Sea (Antarctic) and exceeded summer flux values in the Norwegian and Greenland Seas and in the St. Anna Trough (northwestern Kara Sea).

针对拉普捷夫海（Laptev Sea）北部罗蒙诺索夫海岭（Lomonosov Ridge）区域的微藻通量首次研究，于1995年9月15日至1996年8月16日期间完成，依托布放于150米水深的长期锚定观测站（mooring station）LOMO-2所搭载的沉积物捕集器（sediment trap）开展观测。本研究揭示了垂直微藻通量存在显著的季节变化特征：夏季时以嗜寒硅藻（diatoms）为优势类群的多样微藻群落，在永久冰盖下方呈现旺盛生长态势。微藻生长的极显著季节变化与太阳辐射密切相关，恰在7月中旬至9月末的太阳辐射峰值时段，微藻通量较其余时段高出数百倍。拉普捷夫海北部罗蒙诺索夫海岭区域的夏季微藻通量数值，与南极威德尔海（Weddell Sea）的通量水平相近，且显著高于挪威海（Norwegian Sea）、格陵兰海（Greenland Sea）以及喀拉海（Kara Sea）西北部圣安娜海槽（St. Anna Trough）的夏季微藻通量。