Moisture Origin and Transport for Extreme Precipitation over Indonesia’s New Capital City, Nusantara in August 2021
Moisture Origin and Transport for Extreme Precipitation over Indonesia’s New Capital City, Nusantara in August 2021
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2021 年 8 月印度尼西亚新首都努桑塔拉极端降水的水分来源和输送
作者：
Purwaningsih Anis;Lubis Sandro;Hermawan Eddy;Harjana Teguh;Nur Ratri Dian;Sujalu Akas Pinaringan;Ridho Ainur;Andarini Dita Fatria;Risyanto Risyanto;Anis Purwaningsih;Sandro W. Lubis;E. Hermawan;T. Harjana;D. Ratri;A. P. Sujalu;Ainur Ridho;D. F. Andarini;Risyanto
2021年8月27日至28日，印度尼西亚新首都努桑塔拉经历了罕见的极端降雨事件。这场强降雨发生在8月，根据每月的气候数据，这是一年中最干燥的月份，并引发了严重的洪水和山体滑坡。为了更好地了解此类极端降水事件的潜在机制，我们使用拉格朗日模型 HYSPLIT 研究了水分来源和传输过程。我们的研究结果显示，水分主要通过三个主要路线输送到努桑塔拉：婆罗洲岛（BRN，53.73％）、班达海及其周边地区（BSS，32.03％）和苏拉威西岛（SUL，9.05％）。总体而言，BRN和SUL是陆地水分的主要来源，而BSS是主要的海洋水分来源，其贡献低于陆地水分。 BRN的陆地水汽输送主要由大规模高涡流驱动，而SUL的水汽输送则由北方夏季季节内振荡（BSISO）和与拉尼娜相关的低频变率引起的环流驱动。来自 BSS 的近地表海洋水分输送主要与澳大利亚季风系统造成的盛行风有关。这些对水分来源和途径的深入了解可能会提高印度尼西亚新首都努桑塔拉夏季极端降水预测的准确性，并使该地区的自然资源管理者受益。
Nusantara, Indonesia’s new capital city, experienced a rare extreme rainfall event on 27–28 August 2021. This heavy rainfall occurred in August, the driest month of the year based on the monthly climatology data, and caused severe flooding and landslides. To better understand the underlying mechanisms for such extreme precipitation events, we investigated the moisture sources and transport processes using the Lagrangian model HYSPLIT. Our findings revealed that moisture was mostly transported to Nusantara along three major routes: from Borneo Island (BRN, 53.73%), the Banda Sea and its surroundings (BSS, 32.03%), and Sulawesi Island (SUL, 9.05%). Overall, BRN and SUL were the main sources of terrestrial moisture, whereas the BSS was the main oceanic moisture source, having a lower contribution than its terrestrial counterpart. The terrestrial moisture transport from BRN was mainly driven by the large-scale high vortex flow, whereas the moisture transport from the SUL was driven by the circulation induced by boreal summer intraseasonal oscillation (BSISO) and low-frequency variability associated with La Niña. The near-surface oceanic moisture transport from BSS is primarily associated with prevailing winds due to the Australian monsoon system. These insights into moisture sources and pathways can potentially improve the accuracy of predictions of summer precipitation extremes in Indonesia’s new capital city, Nusantara, and benefit natural resource managers in the region.
影响因子：
4.9
作者：
Simon C. Peatman;J. Schwendike;C. Birch;J. Marsham;A. Matthews;Gui‐Ying Yang
通讯作者：
Simon C. Peatman;J. Schwendike;C. Birch;J. Marsham;A. Matthews;Gui‐Ying Yang