Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

Changes in Moisture Flux over the Tibetan Plateau during 1979-2011: Insights from a High-Resolution Simulation-JOC-May2015

TitleChanges in Moisture Flux over the Tibetan Plateau during 1979-2011: Insights from a High-Resolution Simulation-JOC-May2015
Publication TypeJournal Article
Year of Publication2015
AuthorsGao, Yanhong, L. Leung Ruby, Zhang Yongxin, and Cuo Lan
JournalJournal of Climate
Volume27
Pages1876-1893
Abstract / Summary

Net precipitation [precipitation minus evapotranspiration (P - E)] changes between 1979 and 2011 from a high-resolution regional climate simulation and its reanalysis forcing are analyzed over the Tibetan Plateau (TP) and compared to the Global Land Data Assimilation System (GLDAS) product. The high-resolution simulation better resolves precipitation changes than its coarse-resolution forcing, which contributes dominantly to the improved P -E change in the regional simulation compared to the global reanalysis. Hence, the former may provide better insights about the drivers of P - E changes. The mechanism behind the P - E changes is explored by decomposing the column integrated moisture flux convergence into thermodynamic, dynamic, and transient eddy components. High-resolution climate simulation improves the spatial pattern of P - E changes over the best available global reanalysis. High-resolution climate simulation also facilitates new and substantial findings regarding the role of thermodynamics and transient eddies in P - E changes reflected in observed changes in major river basins fed by runoff from the TP. The analysis reveals the contrasting convergence/divergence changes between the northwestern and southeastern TP and feedback through latent heat release as an important mechanism leading to the mean P - E changes in the TP.

URLhttp://dx.doi.org/10.1175/JCLI-D-14-00581.1
DOI10.1175/JCLI-D-14-00581.1
Journal: Journal of Climate
Year of Publication: 2015
Volume: 27
Pages: 1876-1893
Publication Date: 03/2015

Net precipitation [precipitation minus evapotranspiration (P - E)] changes between 1979 and 2011 from a high-resolution regional climate simulation and its reanalysis forcing are analyzed over the Tibetan Plateau (TP) and compared to the Global Land Data Assimilation System (GLDAS) product. The high-resolution simulation better resolves precipitation changes than its coarse-resolution forcing, which contributes dominantly to the improved P -E change in the regional simulation compared to the global reanalysis. Hence, the former may provide better insights about the drivers of P - E changes. The mechanism behind the P - E changes is explored by decomposing the column integrated moisture flux convergence into thermodynamic, dynamic, and transient eddy components. High-resolution climate simulation improves the spatial pattern of P - E changes over the best available global reanalysis. High-resolution climate simulation also facilitates new and substantial findings regarding the role of thermodynamics and transient eddies in P - E changes reflected in observed changes in major river basins fed by runoff from the TP. The analysis reveals the contrasting convergence/divergence changes between the northwestern and southeastern TP and feedback through latent heat release as an important mechanism leading to the mean P - E changes in the TP.

DOI: 10.1175/JCLI-D-14-00581.1
Citation:
Gao, Y, L Leung, Y Zhang, and L Cuo.  2015.  "Changes in Moisture Flux over the Tibetan Plateau during 1979-2011: Insights from a High-Resolution Simulation-JOC-May2015."  Journal of Climate 27: 1876-1893.  https://doi.org/10.1175/JCLI-D-14-00581.1.