Catlin Arctic Survey 2011 24 hour zooplankton trawl data.

Zooplankton vertical trawl data (50 m to surface) under sea ice from the Catlin Arctic Survey Canadian high Arctic during two targeted 24 hour sampling campaigns in March and April 2011. Data also includes surface light intensity (surface of the sea ice) over the corresponding two 24 hour periods. Data from two 200 m to surface vertical trawls are also provided; one for each of the 24 hour sampling periods.