They can be driven by winds at the surface affecting the water column below, deep water tides or differences in the water density caused by temperature and salinity, known as thermohaline currents.

它们可以由影响水下水柱的表面风、深水潮汐或由温度和盐度引起的水密度差异（称为温盐流）驱动。

We're interested in how, for example, the weather events directly affect the water column and in turn does that affect productivity and then again in fish and further up the food chain, cetaceans or seabirds.

例如，气候变化是如何直接影响水柱，并从而影响生产力，鱼类、食物链、鲸目动物或是海鸟的，我们对研究这些问题比较感兴趣。