Snow-covered mountains on the Tibetan Plateau. Credit: Yanbin Lei
The Tibetan Plateau (TP) is known as the “water tower” of Asia for being dwelling to the headwaters of many main rivers in Asia, together with the Yangtze, Yellow, Ganges, and Indus. Therefore, TP precipitation is vital for not solely native, however regional water assets too. On the opposite hand, the TP can strongly modulate the Asian local weather by dynamic and thermal processes. Previous research have proven that TP snow in winter/spring can considerably affect the Asian monsoon at interannual to interdecadal time scales. TP snow elevated after the late Seventies and decreased after the late Nineties, contributing to simultaneous East Asian summer season rainfall modifications. However, little consideration has been paid to the doable mechanism of TP precipitation change at interdecadal time scales.
In an try to grasp this problem, Associate Prof. Yali Zhu from the Institute of Atmospheric Physics, Chinese Academy of Sciences, has uncovered a tripole winter precipitation change sample across the TP within the late Nineties. In this sample, the precipitation decreased over japanese India, from the southern TP, to southern China, and elevated within the two areas to the north and south. The outcomes have been revealed in Atmospheric and Oceanic Science Letters.
Further dynamical prognosis and numerical experiment outcomes present that tropical Pacific SST modifications can induce strengthened Walker circulation over the Pacific, inflicting ascending movement anomalies over the Indo-Pacific area. The regional meridional–vertical circulation is thus modulated, resulting in descending movement anomalies over japanese India, to the southern TP, to southern China. Combined with the impact of the modifications within the East Asian westerly jet stream, a tripole precipitation sample is shaped across the TP.
“But different components may also affect TP precipitation change, and extra investigation is required,” provides Associate Prof. Zhu. Against the background of worldwide warming, the impression of high-latitude local weather techniques, such because the Arctic sea ice, in addition to anthropogenic exercise, on TP precipitation, requires additional evaluation.
Precipitation in Central Asia formed by sea floor temperature over tropical Pacific and North Atlantic
More info:
Yali Zhu, A tripole winter precipitation change sample across the Tibetan Plateau within the late Nineties, Atmospheric and Oceanic Science Letters (2022). DOI: 10.1016/j.aosl.2022.100223
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Chinese Academy of Sciences
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Discovery of a tripole winter precipitation change sample across the Tibetan Plateau within the late Nineties (2022, May 31)
retrieved 31 May 2022
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