孟加拉湾东部季风核心区夏季西南季风降雨量的年际变化及其与海洋的关系

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Kyaw Than Oo , Kazora Jonah
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引用次数: 0

摘要

这项研究考察了孟加拉湾东部地区夏季季风降雨量受印度洋偶极子(IOD)和厄尔尼诺南方涛动(ENSO)影响的逐年变化情况。研究利用降雨数据和海面温度数据来观察这些变化。研究发现,在厄尔尼诺/南方涛动正相位期间,孟加拉湾东部沿海地区降雨量减少,但印度-缅甸北部地区降雨量增加。在厄尔尼诺/南方涛动负相期间,情况则恰恰相反。研究使用了一种名为 EOF 和 Morlet 小波功率谱分析的特殊分析方法来寻找降雨数据中的重要模式,并进行了相关分析,以了解造成这些地区降雨异常的原因。研究还发现,厄尔尼诺/南方涛动正相时的局地对流和水汽通量与季风核心区的异常降雨有关。对流层上层异常的反气旋环流使降雨更强。在厄尔尼诺/南方涛动正负相位中,印度支那大陆西南季风(MSwM)的强/弱会带来过多/过少的水汽,使当地西南夏季降雨湿润/干燥。在印度-缅甸北部,异常降雨量不仅取决于西南季风的强度,西部扰动的频率也会影响区域降雨量,需要进一步研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interannual variation of summer southwest monsoon rainfall over the monsoon core regions of the eastern Bay of Bengal and its relationship with oceans
The study looked at how summer monsoon rainfall in the eastern Bay of Bengal area changes from year to year due to Indian Ocean Dipole (IOD) and El Niño Southern Oscillation (ENSO). Study used rainfall data and sea surface temperature data to see these variations. It's found that during ENSO positive phase, rainfall decreased in the eastern coastal region of the Bay of Bengal but increased in the northern Indo-Myanmar region. The opposite happened during ENSO negative phase. The study used a special analysis method called EOF and Morlet wavelet power-spectrum analysis to look for important patterns in the rainfall data and did correlation analysis to understand what causes abnormal rainfall in these regions. The study also found that the local convection and water vapor flux during ENSO positive phase are related to the anomalous rainfall in the Monsoon Core region. Rainfall is made stronger by the unusual anticyclone circulation in the upper troposphere. A strong/weak Mainland Indochina southwest monsoon (MSwM) in the positive or negative phase of ENSO can bring excess/less moisture to wet/dry the local southwest summer rainfall. In northern Indo-Myanmar, the anomalous rainfall is not only relied on the intensity of the MSwM but also the frequency of western disturbances also influences the regional rainfall, and further study need to develop.
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来源期刊
Journal of Atmospheric and Solar-Terrestrial Physics
Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理
CiteScore
4.10
自引率
5.30%
发文量
95
审稿时长
6 months
期刊介绍: The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.
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