Climatology and Variability of the Moisture Transport over Pan-Arctic Drainage System: Perspective from cyclone and anticyclone actives

Hydrological cycle has been intensified in the northern high latitude in recent decades, which is strikingly evidenced by an increase of the Eurasian river discharges. Although there are many impacts by various land surface processes, the atmospheric moisture transportation plays a predominant role in contributing to and modulating river discharge. In the high latitude, synoptic-scale systems such as the cyclones, the anticyclones and the related troughs and ridges often traveling from the west to the east, transporting and redistributing moisture generally from ocean to land and from the lower latitude to the higher latitude, are the fundamental weather elements. These weather systems accomplish most of the atmospheric moisture transport. In this study, we analyzed climatology and variability of atmospheric moisture transport associated with the weather system activity over the Pan-Arctic drainage system. The results reveal that how shift of storm track and changes in storm activity, which is measured by storm intensity, position and duration, and how change of the anti-cyclone, which is measured by their intensity and position, modulate and contribute to the recently observed changes in the Eurasian and American river discharge.