近几十年来日本北陆地区初冬降水量不断增加的一个基本因素

IF 2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Kazuto Takemura, Shuhei Maeda, Ryuichi Kawamura
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引用次数: 0

摘要

本研究利用再分析数据集和大集合模拟结果,探讨了近几十年来日本北陆地区初冬降水量呈上升趋势的可能因素。自 20 世纪 90 年代初以来,12 月的月降水量呈显著增加趋势,这与 1 月和 2 月的月降水量不同。12 月降水量的增加与冬季季风环流加强和日本海海面温度变暖导致的海面上升潜热通量有关。近几十年来,12 月平均海表温度的趋势模式与年代际太平洋涛动(IPO)的负相类似,同时从东印度洋到西热带太平洋呈现正趋势。孟加拉湾对流的增强趋势表明,该地区受到气候学上的高海温和与 IPO 相关的变暖海温的共同影响。近几十年来,从南亚到日本附近沿副热带喷流出现了高空波浪式模式,孟加拉湾附近对流增强,日本向北气压下降,这些都有助于冬季季风环流的加强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

An underlying factor of increasing early winter precipitation in the Hokuriku region of Japan in recent decades

An underlying factor of increasing early winter precipitation in the Hokuriku region of Japan in recent decades

An underlying factor of increasing early winter precipitation in the Hokuriku region of Japan in recent decades

Using a reanalysis dataset and large-ensemble simulation results, this study examines a possible factor of increasing trend in early winter precipitation in recent decades in the Hokuriku region of Japan. Monthly precipitation in December has a significant increasing trend after the early 1990s, which is different from those in January and February. The increasing precipitation in December is related to that in the sea surface upward latent heat flux due to intensified winter monsoon circulation and warming sea surface temperatures (SSTs) over the Sea of Japan. December averaged SSTs show a trend pattern in recent decades that is similar to the negative phase of the interdecadal Pacific oscillation (IPO), accompanied by positive trends from the eastern Indian Ocean to the western tropical Pacific. The enhanced trend of convection over the Bay of Bengal is seen; suggesting a combined effect of climatologically high SSTs and IPO-related warmed SSTs over the region. Trends in recent decades of an upper-level wavy pattern from South Asia to near Japan along the subtropical jet associated with enhanced convection near the Bay of Bengal and the related pressure drop from Japan to the north are seen, which contribute to intensified winter monsoon circulation.

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来源期刊
Atmospheric Science Letters
Atmospheric Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.90
自引率
3.30%
发文量
73
审稿时长
>12 weeks
期刊介绍: Atmospheric Science Letters (ASL) is a wholly Open Access electronic journal. Its aim is to provide a fully peer reviewed publication route for new shorter contributions in the field of atmospheric and closely related sciences. Through its ability to publish shorter contributions more rapidly than conventional journals, ASL offers a framework that promotes new understanding and creates scientific debate - providing a platform for discussing scientific issues and techniques. We encourage the presentation of multi-disciplinary work and contributions that utilise ideas and techniques from parallel areas. We particularly welcome contributions that maximise the visualisation capabilities offered by a purely on-line journal. ASL welcomes papers in the fields of: Dynamical meteorology; Ocean-atmosphere systems; Climate change, variability and impacts; New or improved observations from instrumentation; Hydrometeorology; Numerical weather prediction; Data assimilation and ensemble forecasting; Physical processes of the atmosphere; Land surface-atmosphere systems.
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