中国西部矿尘的来源、输送、沉积和直接辐射效应:以青藏高原为重点的 2022 年 7 月模拟研究

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric Research Pub Date : 2024-09-26 DOI:10.1016/j.atmosres.2024.107708
Lin Liang , Zhiwei Han , Weiwei Chen , Jiawei Li , Mingjie Liang , Shujing Shen
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引用次数: 0

摘要

应用由 WRF 驱动的区域空气质量模式系统(RAQMS)探讨了 2022 年 7 月中国西部矿尘的排放、传输、沉积和直接辐射效应,重点是青藏高原(TP)。根据地面和卫星观测资料对模型进行的验证表明,模型较好地再现了气象变量、可吸入颗粒物(PM10)浓度、气溶胶光学深度(AOD)和垂直方向的消光系数。2022 年 7 月 3 日至 7 日,塔克拉玛干沙漠(Taklimakan Desert,TKD)发生了一次沙尘事件,在反气旋流的作用下影响了西藏东部和中部,导致拉萨的 PM10 最大小时浓度超过 50 μg m-3。沙尘气溶胶使大埔东部地区的短波辐射大大减少,7 月 5 日,宁池附近白天平均短波辐射的最大降幅达到 30 W m-2。在中国西部省会城市,人为气溶胶在 PM10 质量中占主导地位(54-67%),而在靠近沙漠的城市,尘埃气溶胶则占主导地位。在这次沙尘事件中,来自塔克拉玛干沙漠和柴达木沙漠(QDD)的沙尘气溶胶对东部TP产生了显著影响,在昌都、拉萨和宁孜,沙尘对PM10质量浓度的贡献率分别为52%、76%和69%。2022 年 7 月,中国西部的沙尘排放总量约为 10.6 吨,其中塔克拉玛干沙漠的贡献最大(63.5%),其次是戈壁滩(26%)。据估计,沙尘的总沉降量为 6.2 吨,其中塔克拉玛干沙漠和戈壁滩分别占 66% 和 22%。在研究期间,约有 418 千兆克的尘埃气溶胶沉积在大埔县,其中 49% 来自塔克拉玛干沙漠,25% 来自丘陵沙漠。外来尘源分别约占大埔区尘埃浓度和总沉降量的 7% 和 9%。在南部大埔,估计尘埃沉降的来源分别为 42%、24% 和 21%,分别来自倒扣湾、外国来源和 QDD,这表明远距离越境尘埃迁移可能对大埔的沉降、地表反照率和气候产生重要影响。
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The source, transport, deposition and direct radiative effect of mineral dust over western China: A modeling study of July 2022 with focus on the Tibetan Plateau
A Regional Air Quality Model System (RAQMS) driven by WRF was applied to explore the emission, transport, deposition, and direct radiative effect of mineral dust over western China in July 2022, with focus on the Tibetan Plateau (TP). Model validation against ground and satellite observations demonstrated the model reproduced meteorological variables, PM10 concentration, aerosol optical depth (AOD), and extinction coefficients in the vertical reasonably well. There was a dust event during 3–7 July 2022, which was originated from the Taklimakan Desert (TKD) and affected eastern and central TP under anticyclonic flows, resulting in the maximum hourly PM10 concentration exceeding 50 μg m−3 in Lhasa. Shortwave radiation was reduced considerably by dust aerosols over eastern TP, with the maximum decrease in daytime mean shortwave radiation reaching 30 W m−2 around Nyingchi on 5 July. Anthropogenic aerosols dominated PM10 mass in the capital cities of western China (54–67 %), while dust aerosols were dominant in the cities near the deserts. During this dust event, dust aerosols from TKD and Qaidam Desert (QDD) significantly influenced eastern TP, with dust contributions to PM10 mass concentration of 52 %, 76 % and 69 %, respectively, in Chamdo, Lhasa and Nyingzhi, respectively. The total dust emission in western China was about 10.6 Tg in July 2022, with the largest contribution from TKD (63.5 %), followed by Gobi Desert (GB) (26 %). The total deposition of dust was estimated to be 6.2 Tg, in which TKD and GB contributed 66 % and 22 %, respectively. During the study period, about 418 Gg dust aerosols were deposited on TP, 49 % of which was from TKD and 25 % from QDD. Foreign dust sources contributed approximately 7 % and 9 % to dust concentration and total deposition over TP, respectively. Over southern TP, the source contribution to dust deposition was estimated to be 42 %, 24 % and 21 % from TKD, foreign sources and QDD, respectively, suggesting potentially important impact of long-range transboundary dust transport on deposition, surface albedo and climate over TP.
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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