title: Influence of the Madden-Julian oscillation on Tibetan Plateau snow cover at the intraseasonal time-scale.
abstract: The Tibetan Plateau (TP), known as the third pole of the Earth, has snow cover with intraseasonal to decadal variability that affects weather and climate both inside and outside the TP. However, the factors that generate the TP snow cover (TPSC) anomalies at the intraseasonal time-scale are unclear. This report reveals the influence of the Madden‒Julian oscillation (MJO), which is the most dominant component of the tropical intraseasonal variability, on TPSC. We focus on wintertime snow cover over the central and eastern TP, where the intraseasonal variability is large. TPSC increases/decreases in the MJO phases 8‒1/4-5, when the eastward-propagating MJO suppressed/enhanced convection locates over the Maritime Continent. Such a change in TPSC leads to the most dominant positive/negative anomalies of TPSC in the following phases 2‒3/6‒7 due to the non-significant change of TPSC in these phases. There is anomalous moisture advection over the upstream of the TP caused by MJO-excited large-scale atmospheric circulation. The advection process generates the low-frequency eastward-propagating anomalous water vapour from upstream to the TP that influences precipitation and, eventually, TPSC.
authors.affiliation: Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, China.|Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing, China.
authors.forename: Wenkai
authors.initials: W
authors.lastname: Li
authors.affiliation: Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, China.|Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing, China.
authors.forename: Weidong
authors.initials: W
authors.lastname: Guo
authors.affiliation: Key Laboratory of Meteorological Disaster of Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science &Technology, Nanjing, China.
authors.forename: Pang-Chi
authors.initials: PC
authors.lastname: Hsu
authors.affiliation: Department of Geography and Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA.
authors.forename: Yongkang
authors.initials: Y
authors.lastname: Xue