Dissolved carbon dioxide within aquatic areas of Doñana Natural Area (2010-2011)

Abstract

This data set includes measurements of water samples collected from 11 water bodies (n = 6 to 12 per water body) between March 2010 and March 2011 within Donana Natural Area. Geographic coordinates of sampling positions and a Google Earth .kml file are provided. Approximately every 30 days in situ water conductivity (converted to salinity), temperature and pH were measured using a multi-probe (YSI-6920V2, YSI Incorporated, Yellow Springs, Ohio, USA) and filtered water samples were collected for laboratory analysis of dissolved phosphate, silica (using a Skalar San++ 215 Continuous Flow Analyser) and total alkalinity (using a Metrohm 794 Titroprocessor following the method described by Mintrop et al. 2000). Dissolved carbon dioxide partial pressure was calculated from pH and total alkalinity using co2sys.xls (Pierrot et al., 2000) with the dissociation constants for carbon and sulphate of (Cai and Wang 1998) and (Dickson 1990), respectively. Carbon dioxide partial pressure in air and daily-ensemble-averaged horizontal wind velocity at 10 m above the land surface were provided by the ICTS Donana Scientific Reserve (ICTS-2009-39) and are included to allow calculations of air-water fluxes. Estimates of the areal extent of the water bodies derived via remote sensing (DEIMOS-1 and Landsat 5 TM sensors) within each wetland region of Donana Natural Area are included to allow up-scaling of fluxes to regional air-water carbon transport rates. A Google Earth .kml file delineating the wetland regions is provided and a Google Earth .kmz file showing an indication of the aggregate water coverage derived from the DEIMOS-1 sensor (8 images between Aug 2010 and Sept. 2011) is included to allow qualitative visualization of the areal extent and duration of water coverage. The data is provided as [space] delimited plain text files and Google Earth kml and kmz files within a compressed folder that also includes a detailed data description text file (README_data_description) written using Simple Markdown syntax converted to PDF and HTML.