Zooplankton biovolume time series at station STARESO (Bay of Calvi, Corsica)

A long-term time series of subsurface zooplankton is performed in the oligotrophic Bay of Calvi (Corsica, Ligurian Sea, NW Mediterranean) from 2003 onwards. It is carried out from the marine station STARESO and is based on weekly measurement of zooplankton biovolumes. The main objectives are (i) to determine the seasonal cycle and inter-annual variability of the organisms, (ii) to study the dynamics of the populations, and (iii) to understand zooplankton interactions with other co-sampled hydrographic, meteorological and phytoplankton variables at the site.

Time series of black carbon aerosol measurements from Neumayer Station, 1999-2011

Continuous black carbon (BC) observations were conducted from 1999 through 2009 by an Aethalometer (AE10) and from 2006 through 2011 by a Multi-Angle Absorption Photometer (MAAP) at Neumayer Station (NM) under stringent contamination control. Considering the respective observation period, BC concentrations measured by the MAAP were somewhat higher (median ± standard deviation: 2.1 ± 2.0 ng/m**3) compared to the AE10 results (1.6 ± 2.1 ng/m**3). Neither for the AE10 nor for the MAAP data set a significant long-term trend could be detected. Consistently a pronounced seasonality was observed with both instruments showing a primary annual maximum between October and November and a minimum in April with a maximum/minimum ratio of 4.5/1.6 = 3.8 and 2.7/0.64 = 4.2 for the MAAP and AE10 data, respectively. Occasionally a secondary summer maximum in January/February was visible. With the aim to assess the impact of BC on optical properties of the aerosol at NM, we evaluated the BC data along with particle scattering coefficients measured by an integrating nephelometer. We found the mean single scattering albedo of w550 = 0.992 ± 0.0090 (median: 0.994) at a wavelength of 550 nm with a range of values from 0.95 to 1.0.