Intraseasonal influence of the North Atlantic-East and North Asia pattern on TP summer land surface energy budget

Analysis of the multi-scale variation characteristics of the land surface energy budget and its causes over the Tibetan Plateau (TP) is helpful to deepen the understanding of local land-air interaction and its climate effects. Based on daily atmospheric reanalysis data during the period of 1981-2018, the intraseasonal impacts of the North Atlantic-East and North Asia (NAENA) teleconnection pattern on TP summer land surface energy budget and the associated mechanism are studied. NAENA is the second mode of 200-hPa meridional wind anomalies over the Eurasian continent, which has significant effects on the multi-scale climatic variability in Eurasia. Composite analysis showed that the NAENA pattern can significantly affect land surface energy budget anomalies in TP by regulating the atmospheric circulation anomalies over and around the TP. On day 0 of positive-phase NAENA events, there is a cyclone to the west of TP, which can lead to anomalous vertical ascending (descend) motion and convergence (divergence) over the lower atmosphere of the northeast (southwest) of the TP. Moreover, it can result in an anomalous increase (decrease) in cloud cover, contributing to weakened (enhanced) downwelling surface shortwave radiation flux and enhanced (weakened) downwelling surface longwave radiation flux, and leading to an anomalous weakening (enhancement) in surface sensible heat flux over the northeastern (southwestern) TP.