孙宇婷,郑向东,卞建春,张金强,白志轩. 2022. 夏季青藏高原北部对流层臭氧垂直分布的观测研究[J]. 气象学报, (0):-, doi:[doi]
夏季青藏高原北部对流层臭氧垂直分布的观测研究
Vertical distribution of summer tropospheric ozone over the northern Tibetan Plateau
投稿时间:2022-03-04  修订日期:2022-05-18
DOI:
中文关键词:  青藏高原北部,对流层臭氧,天气过程,阻塞暖高压反气旋,强对流
英文关键词:Northern Tibetan Plateau, Tropospheric ozone, Weather process,Warm blocking high anticyclone,Deep convection
基金项目:国家自然科学基金(项目号:91837311)
作者单位邮编
孙宇婷 复旦大学大气与海洋科学学院/大气科学研究院 100081
郑向东 中国气象科学研究院 100081
卞建春 中科院大气物理研究所 100029
张金强 中科院大气物理研究所 100029
白志轩 中科院大气物理研究所 100029
摘要点击次数: 21
全文下载次数: 18
中文摘要:
      对流层臭氧垂直分布变化对气候环境有着重要的影响,然而观测数据一直较为稀缺。本文使用2016年7月下旬~8月期间青海省格尔木市对流层臭氧探空观测开展夏季青藏高原北部对流层臭氧垂直分布变化特征及其形成机制的气象背景研究。结果表明,在天气背景的转换下对流层臭氧垂直分布整体上呈现高(低)臭氧与低(高)水汽和高(低)位势涡度的对应。除7月25~27日高空低压槽过境导致的平流层向下输送(STT)使得对流层臭氧增加明显过程外,本文还观测到阻塞暖高压反气旋和源自青藏高原主体地区强对流天气过境均对流层臭氧分布的影响:阻塞暖高压在观测点东北部形成后导致了7月31日至8月8日期间格尔木在对流层连续出现罕见东风,但对流层臭氧浓度仅在8月2日因东北-西南方向反气旋切变而出现较高值,其中6 km高度以下则因为东风输送而出现高臭氧高比湿的污染性气团。强对流天气过境影响使得8月12~14日10 km高度以上出现臭氧最低值和比湿最高值。与西宁历史夏季(1996年7~8月初)臭氧探空测值比较,格尔木对流层臭氧浓度8月偏低,该特征与季风影响青藏高原纬度最高地区所在月份一致。与林芝(2017年7月)、那曲(2011年7末~8月中旬)和拉萨(1998年8月)历史夏季臭氧探空测值比较发现,纬度效应对青藏高原地区对流层臭氧浓度有影响。
英文摘要:
      Tropospheric ozone (O3) is a significance gas of climate and air quality. The observation data of tropospheric O3 is still insufficient. In this manuscript, the vertical distribution of tropospheric O3 and its associated meteorology from July 25th to August 22nd, 2016, observed at Golmud, a city in Qinghai Province on the Northern Tibet Plateau (TP) are analyzed for better understanding the characteristics and mechanism of tropospheric O3 variations there. The general feature is that the observed high (low) O3 quietly matches with low (high) water vapor and high (low) potential vorticity. Except for the tropospheric O3 enhancement associated with the passage of low-pressure trough from July 25th to 27th, the impacts of a warm blocking high anticyclone and a passage of deep convection synoptic from the main area of the TP on the distribution of tropospheric O3 are observed and analyzed respectively for the first time in the northern TP. After the formation of blocking warm high in the northeast of the observation site, east wind vector occurred continuously in the whole troposphere at Golmud from July 31st to August 8th, but tropospheric O3 concentration only shows small higher value on August 2nd due to the anticyclone shear along the Northeast -southwest direction, and pollutant air mass with high O3 and high specific humidity (q) below 6 km appeared due to the westward transport. The lowest O3 and the highest q during the entire observational period appeared above 10 km from August 12th to 14th with the passage of deep convection synoptic. Compared with the historical tropospheric O3 observed in Xining (from July to early August 1996), the analyzed data exhibits its seasonal lower value in August at Golmud, which is consistent with seasonal evaluation of the summer monsoon. Compared with the historical tropospheric O3 observed in Linzhi (July 2014), Naqu (from late July to mid-August 2011) and Lhasa (August 1998), it is found that latitude has an effect to O3 over the Tibetan Plateau.
查看全文   查看/发表评论  下载PDF阅读器
分享按钮