During the ArcticNet annual cruises of the research icebreaker CCGS Amundsen, characteristics of the near-surface atmosphere (basic meteorological elements, incident radiation, CO2 concentration) are monitored in conjunction with surface sea water properties (temperature, salinity, dissolved CO2 and O2) to observe the relationship between the surface micro-climate and the air-sea exchange, with particular interest in CO2. As part of this integrated dataset, the following radiation variables were recorded at 1 minute intervals (instrument used to collect each variable is in parentheses): -Incoming shortwave radiation (Eppley pyranometer, model PSP) -Incoming longwave radiation (Eppley pyrgeometer, model PIR) -Incoming photosynthetically active radiation (Kipp & Zonen, PAR-Lite) -Incoming UV-A radiation (Kipp & Zonen UVS-AB-T) -Incoming UV-B radiation (Kipp & Zonen UVS-AB-T) All instruments were mounted on a platform above the wheelhouse of the CCGS Amundsen

The CTD data was obtained during LEG 01 of the 2003 CASES scientific cruise #0303. This Leg was carried out from September 8th 2003 to October 15th 2003 aboard the CCGS Amundsen. There were 37 CTD casts in Leg 1. One cast, associated to 1 oceanographic station, is located in the Northern Baffin Bay research area. The following parameters were measured: temperature, conductivity and pressure (with a Sea-Bird 911 probe), oxygen (Sea-Bird 43), fluorescence (Seapoint fluorometer), transmittance (Wetlabs C-Star transmissometer). There are two different versions of the CTD data file. A version containing processed data that was sent to the NIs and the original version containing all the data and metadata that were quality controlled. The first version of the data file is hosted on the ArcticNet FTP site and the second version is hosted by the Marine Environmental Data Service (MEDS) of Fisheries and Ocean Canada ans the Polar Data Catalogue.

The CTD data was obtained during the 2007-2008 ArcticNet scientific cruise #0706. The data were collected from September 28 to October 4, 2007, aboard the CCGS Amundsen. There were 21 casts, associated to 9 oceanographic stations, in the Northern Baffin Bay. The following parameters were measured: temperature, conductivity and pressure (with a Sea-Bird SBE-9plus), dissolved oxygen (Sea-Bird SBE-43), pH (Sea-Bird SBE-18-I), fluorescence (Seapoint chlorophyll fluorometer), nitrate concentration (Satlantic MBARI-ISUS 5T), transmittance (Wetlabs C-Star transmissometer), light intensity (PAR; Biospherical Instruments QCP2300) and surface light intensity (sPAR; Biospherical Instruments QCP2200). Quality control procedures were applied to the data. Data are available on the Polar Data Catalogue and at the Marine Environmental Data Service (MEDS) of Fisheries and Oceans Canada.