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Evidence of the recent decade change in global fresh water discharge and evapotranspiration revealed by reanalysis and satellite observations |
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| Authors: | Ki-Weon Seo Duane E Waliser Baijun Tian Baek-Min Kim Seong-Chan Park Steve Cocke Byung-Ju Sohn Masayoshi Ishii |
| Institution: | 1. Korea Polar Research Institute, Incheon, Korea 7. Korea Polar Research Institute, 12 Gaetbeal-ro, Yeonsu-Gu, Incheon, 406-840, Korea 2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA 3. School of Earth and Environmental Sciences, Seoul National University, Seoul, Korea 4. Observation Policy Division, Korea Meteorological Administration, Seoul, Korea 5. Department of Meteorology, Florida State University, Tallahassee, FL, USA 6. Climate Research Department, Meteorological Research Institute, Tsukuba, Japan |
| Abstract: | Variations of global evapotranspiration (ET) and fresh water discharge from land to oceans (D) are important components of global climate change, but have not been well monitored. In this study, we present an estimate of twenty years (1989 to 2008) variations of global D and ET derived from satellite remote-sensed measurements and recent reanalysis products, ERA-Interim and CFSR, by using a novel application of the water balance equations separately over land and over oceans. Time series of annual mean global D and ET from both satellite observations and reanalyses show clear positive and negative trends, respectively, as a result of modest increase of oceanic evaporation (E o ). The inter-annual variations of D are similar to the in-situ-based observations, and the negative trend of ET supports the previous result that relative humidity has decreased while temperature has increased on land. The results suggest considerable sensitivity of the terrestrial hydrological cycles (e.g., D and ET) to small changes in precipitation and oceanic evaporation. |
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