Global surface layer salinity change detected by Argo and its implication for hydrological cycle intensification |
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| Authors: | Shigeki Hosoda Toshio Suga Nobuyuki Shikama Keisuke Mizuno |
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| Institution: | (1) Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology, Kharagpur, 721 302, India;(2) Department of Atmospheric Sciences, University of Illinois at Urbana, Champaign, IL 6180, USA;(3) Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Hyderabad, India |
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| Abstract: | We investigated changes in the global distribution of surface-layer salinity by comparing 2003–2007 Argo-float data with annual
mean climatological surface-layer salinity data for 1960–1989 from the World Ocean Database 2005. The two datasets showed
similar patterns, with low values in subpolar and tropical regions and higher values in the subtropics. The recent Argo data
indicate that the contrast between low and high salinity has intensified in all areas except the subpolar North Atlantic.
The intensified contrast of the surface layer salinity was maintaining for 2003–2007. Using a simple method, we attempted
to estimate evaporation and precipitation changes on the basis of surface-layer salinity changes. The results show a high
probability that the global hydrological cycle has increased in the past 30 years. |
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