Modulation of the Atmospheric Heat Source Over the Tibetan Plateau on the Intra-seasonal Oscillation of Summer Precipitation in the Yangtze-Huaihe River Basin

IF 1.6 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmosphere-Ocean Pub Date : 2022-05-23 DOI:10.1080/07055900.2022.2077170

Shanshan Zhong, Hao Wang, Bin Chen, Huanchun Chen

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引用次数: 3

Abstract

ABSTRACT Based on the daily precipitation from China Meteorological Administration and the daily atmospheric circulation data from the Japanese 55-year Reanalysis (JRA-55) from 1979 to 2018, this paper analyzes the evolution of 10-30-day intra-seasonal oscillation (ISO) of the precipitation in the Yangtze-Huaihe River Basin (YHRB) and the modulation of the atmospheric heat source over the Tibetan Plateau (TP) with different intensity on the peak and trough values of the precipitation in the YHRB. When the atmospheric heating is strong on the southern flank of TP (STP), the lower-level anomalous low strengthens on the STP, which leads to convergence of airflow in the lower troposphere, ascent and divergence in the upper troposphere. Thus, the intense pumping action on the STP results in the convergence of water vapour from the Bay of Bengal to the STP. Due to the high altitude of TP, the water vapour turns eastward and increases the convergence and ascent of water vapour in the YHRB, which is conductive to enhancement of the peak values or weakening of trough values of the ISO of precipitation in the YHRB. When the STP heating is weak, the lower-level anomalous low decreases on the STP, leading to divergence in the lower troposphere, descent and convergence in the upper troposphere. Then the convergence of water vapour from the Bay of Bengal to the STP is suppressed and the transport of water vapour to the YHRB is interrupted, thus the peak values of precipitation are weakened or the trough are enhanced.

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青藏高原大气热源对长江-淮河流域夏季降水季内振荡的调制

摘要根据中国气象局的日降水量和日本1979～2018年55年再分析（JRA-55）的日大气环流数据，分析了江淮流域10～30天降水季节内振荡（ISO）的演变过程，以及青藏高原不同强度的大气热源对流域降水峰谷值的调制作用。当TP（STP）南侧的大气加热较强时，STP上的低层异常低气压增强，导致对流层下部气流会聚，对流层上部气流上升和发散。因此，对污水处理厂的强烈抽水作用导致水蒸气从孟加拉湾汇聚到污水处理厂。由于TP海拔较高，水汽转向东，增加了YHRB中水汽的汇聚和上升，这有利于YHRB中降水ISO峰值的增强或槽值的减弱。当STP加热较弱时，低层异常低在STP上减少，导致对流层下部的发散、对流层上部的下降和辐合。然后，从孟加拉湾到STP的水蒸气汇聚被抑制，水蒸气到YHRB的传输被中断，因此降水峰值减弱或波谷增强。

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来源期刊

Atmosphere-Ocean 地学-海洋学

CiteScore

2.50

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： Atmosphere-Ocean is the principal scientific journal of the Canadian Meteorological and Oceanographic Society (CMOS). It contains results of original research, survey articles, notes and comments on published papers in all fields of the atmospheric, oceanographic and hydrological sciences. Arctic, coastal and mid- to high-latitude regions are areas of particular interest. Applied or fundamental research contributions in English or French on the following topics are welcomed: climate and climatology; observation technology, remote sensing; forecasting, modelling, numerical methods; physics, dynamics, chemistry, biogeochemistry; boundary layers, pollution, aerosols; circulation, cloud physics, hydrology, air-sea interactions; waves, ice, energy exchange and related environmental topics.