Figure 1. Contour plots of decadal summer FWCL (m) in the BG relative to salinity 34.8. The summer FWCL volume estimates for the BG region (1000 km3) for each decade are indicated by black numbers in white boxes. Data for 1950–1980 are from summer gridded fields [Timokhov and Tanis, 1997, 1998]. The 1990 and 2000 data are optimally interpolated fields from observations acquired during the summer period for each decade. Gray shading indicates expected error in the interpolation is greater than 2 m. Black dots show locations of BGOS mooring locations for reference.