An Arctic-Tibetan Connection on Subseasonal to Seasonal Time Scale

• Main Authors: Zhang, Y, Zou, T, Xue, Y
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: eScholarship, University of California 2019
• Subjects: subseasonal to seasonal prediction; land surface temperature; Tibetan snow anomaly; Arctic-Tibetan wave train; Meteorology & Atmospheric Sciences; Arctic; Pacific
• Online Access: https://escholarship.org/uc/item/9vx2v42d

Recent research indicates the great potentials of springtime land surface temperature (LST) as a new source of predictability to improve the subseasonal to seasonal climate prediction. In this study, we explore the initial cause of the springtime large-scale LST in Tibetan Plateau (TP) and disentangle its close connection with the February wave activities from the Arctic region. Our Maximum Covariance Analysis show that the spring LST in TP is significantly coupled with the regional snow cover in the preceding months. The latter is further strongly coupled with the February atmospheric circulation and wave activities in mid-to-high latitudes. When the atmospheric circulation is in a combined pattern of Arctic Oscillation and West Pacific teleconnection pattern, wave trains from the Arctic can propagate and reach the TP through northern and southern pathways. This brings dynamical and moisture conditions for the TP snowfall and builds a bridge for Arctic-Tibetan connection.