Long-term (> 40 years) monitoring of near-surface salinity needed to detect global changes in the hydrological cycle

James R Reagan1,2, Dan Seidov3, Tim Boyer2 and Melissa Zweng3, (1)Earth System Science Interdisciplinary Center, COLLEGE PARK, MD, United States, (2)NOAA/NESDIS/NCEI-MD, Silver Spring, United States, (3)NOAA/NESDIS/NCEI-MD, Silver Spring, MD, United States