青藏高原夏季大气热源对青藏高原北侧经向环流年际变化的影响

IF 4.8 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Climate Pub Date : 2024-06-14 DOI:10.1175/jcli-d-23-0599.1
Hongyu Luo, Haipeng Yu, Zeyong Hu, Jie Zhou, Bofei Zhang, Yaoxian Yang, Shanling Cheng, Yongqi Gong, Yu Ren
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引用次数: 0

摘要

摘要 青藏高原(TP)上空的夏季大气热源诱发了青藏高原及其周边地区的经向环流。以往的研究主要集中于青藏高原南侧的季风环流,而其北侧经向环流的形成和维持机制尚不清楚。本研究比较了 AHS 的三种计算方法,分析了夏季 AHS 在大埔上空的时空变率,并基于大气环流二维分解方法和敏感性试验,讨论了其对大埔北侧经向环流年际变率的影响。结果表明,在 AHS 正异常年份,TP 东南部的冷凝潜释二重加热可能导致异常上升运动。与此同时,东亚中高纬度之间经向温度梯度的增加会导致向南偏西气流的增强。在这种情况下,位于西风喷流入口北侧的 TP 北侧区域受到负异常相对涡度平流的影响,盛行异常下降运动,这使得经向环流的下降分支显著呈现。与以往研究认为经向环流的下降支是对上升流的补偿不同,线性条带模型(LBM)的结果验证了下降支主要受到与西风喷流区域尺度变率相关的涡度平流的影响。该研究揭示了大埔北侧经向环流的物理机制,对大埔及西北地区的季节预报具有重要意义。
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Impact of the Summer Atmospheric Heat Source over the Tibetan Plateau on Interannual Variability of Meridional Circulation on the North Side of the Tibetan Plateau
Abstract The summer atmospheric heat source (AHS) over the Tibetan Plateau (TP) induces meridional circulations in TP and its surrounding areas. Previous studies mainly focused on the monsoon circulation on the south side of TP, while the formation and maintenance mechanisms of meridional circulation on its north side remain unclear. This study compared three calculation methods of the AHS, analyzed the spatial–temporal variability of the summer AHS over the TP, and discussed its influence on the interannual variability of meridional circulation on the north side of the TP based on the two-dimensional decomposition method of atmospheric circulation and sensitivity experiments. The results indicate that in the positive AHS anomalies years, the diabatic heating of condensation latent release in southeastern TP could motivate anomalous ascending motion. Simultaneously, the increased meridional temperature gradient between the mid- and high latitudes of East Asia leads to an enhanced southward westerly jet. In this context, the region on the north side of TP, located on the north side of the westerly jet entrance, is affected by negative anomalous relative vorticity advection, prevailing anomalous descending motion, which makes the descending branch of meridional circulation significantly presented. Unlike previous studies that considered the descending branch of meridional circulation as the compensation for upward flow, the results of the linear baroclinic model (LBM) verify that the descending branch is mainly influenced by the vorticity advection related to regional scale variability of the westerly jet. This study reveals the physical mechanism of meridional circulation on the north side of TP, which offers valuable implications for seasonal forecasting in TP and Northwest China.
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来源期刊
Journal of Climate
Journal of Climate 地学-气象与大气科学
CiteScore
9.30
自引率
14.30%
发文量
490
审稿时长
7.5 months
期刊介绍: The Journal of Climate (JCLI) (ISSN: 0894-8755; eISSN: 1520-0442) publishes research that advances basic understanding of the dynamics and physics of the climate system on large spatial scales, including variability of the atmosphere, oceans, land surface, and cryosphere; past, present, and projected future changes in the climate system; and climate simulation and prediction.
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