高塔观测亚马逊中部向北涌动的阵风前沿及其在二氧化碳中尺度迁移中的作用

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Meteorological Applications Pub Date : 2024-10-23 DOI:10.1002/met.70002
Luciane I. Reis, Maurício I. Oliveira, Cléo Q. Dias-Júnior, Hella van Asperen, Luca Mortarini, Otávio C. Acevedo, Christopher Pöhlker, Leslie A. Kremper, Bruno Takeshi, Carlos A. Quesada, Daiane V. Brondani
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引用次数: 0

摘要

在两座微型气象塔上获得的高频测量数据,对影响亚马逊中部亚马逊高塔观测站(ATTO)的罕见向北涌动的阵风锋进行了研究。阵风前沿源自 2021 年 12 月 27 日上午在巴西北部亚马孙州马瑙斯附近的一个衰减中尺度对流系统,并向东北方向涌向 ATTO 观测站。尽管阵风前沿脱离了正在衰减的中尺度对流系统母体,但在塔架上观测到了大幅降温和强劲的持续风,并持续了 4 个多小时。更重要的是,阵风前锋导致整个塔深度的二氧化碳浓度急剧上升,这表明阵风前锋风从 ATTO 站点的上游来源水平平移了富含二氧化碳的空气。据推测,富含二氧化碳的外流来自亚马逊东南部森林大火的向下输送和/或生物质燃烧,这两种观点都得到了阵风前线通过后在 ATTO 测得的气溶胶浓度大幅增加的支持。我们的研究结果表明,有必要进一步研究中尺度对流环流在亚马逊地区痕量气体和气溶胶的重新分布中所起的作用。
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Tall tower observations of a northward surging gust front in central Amazon and its role in the mesoscale transport of carbon dioxide

High-frequency measurements obtained at two micrometeorological towers are investigated for a rare northward surging gust front that impacted the Amazon Tall Tower Observatory (ATTO), in central Amazon. The gust front originated from a decaying mesoscale convective system (MCS) during the morning hours of 27 December 2021 near Manaus, Amazonas state, northern Brazil, and surged north-eastward towards the ATTO site. Large temperature drops and vigorous, persistent winds were observed at the towers which lasted for over 4 h despite the gust front being detached from its parent, decaying MCS. More importantly, the gust front was responsible for drastic increases of CO2 concentrations throughout the tower depths, which suggests that the gust front winds horizontally advected CO2-rich air from a source upstream from the ATTO site. The CO2-rich outflow is hypothesized to originate from downward transport and/or biomass burning from forest fires in southeastern Amazon, both ideas that are supported by large increases of aerosol concentrations measured at ATTO following the gust front passage. Our results stress the need for further investigations addressing the role played by mesoscale convective circulations in the redistribution of trace gases and aerosols in the Amazon.

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来源期刊
Meteorological Applications
Meteorological Applications 地学-气象与大气科学
CiteScore
5.70
自引率
3.70%
发文量
62
审稿时长
>12 weeks
期刊介绍: The aim of Meteorological Applications is to serve the needs of applied meteorologists, forecasters and users of meteorological services by publishing papers on all aspects of meteorological science, including: applications of meteorological, climatological, analytical and forecasting data, and their socio-economic benefits; forecasting, warning and service delivery techniques and methods; weather hazards, their analysis and prediction; performance, verification and value of numerical models and forecasting services; practical applications of ocean and climate models; education and training.
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