Increasing precipitation intensity under a warming climate over Northern Eurasia

Wednesday, 17 December 2014: 5:15 PM
Hengchun Ye1, Eric J Fetzer2, Ali Behrangi2, Sun Wong2, Bjorn Lambrigtsen2, Crysti Y Wnag3, Judah Levi Cohen4 and Brandi Gamelin5, (1)California State University Los Angeles, Los Angeles, CA, United States, (2)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (3)Wellesley College, Wellesley, MA, United States, (4)Atmos and Environ Res Inc., Lexington, MA, United States, (5)University of California, Santa Barbra, Geography, Santa Barbra, CA, United States
One of the manifestations of accelerated hydrological cycle under a warming climate over high latitudes is the changing precipitation characteristics. Studies have suggested increasing precipitation extremes and quantity (especially in winter), and changing frequency of solid versus liquid precipitation. This study tries to understand the changes in average daily precipitation intensity under a background of increasing air temperature for all seasons. We found a prevailing increase in daily precipitation intensity associated with increasing air temperature at an inter-decadal time scale for all seasons, including summer when precipitation total decreases. These relationships are independent of the impacts of Arctic Oscillation over the region. The results suggest that the warming climate over Northern Eurasia would bring higher intensity but less frequent precipitation with little changes in annual precipitation total.