Lu Chuhan, Bai Yawen, Liu Li, Kong Yang, Chen Xiaoxiao
Key Laboratory of Ecosystem Carbon Source and Sink, China Meteorological Administration (ECSS-CMA), Wuxi University, Wuxi, 214063, China.
Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Sci Rep. 2024 Jul 23;14(1):16952. doi: 10.1038/s41598-024-67661-y.
In recent decades, the atmospheric moisture capacity has increased globally in concert with global warming, with a particularly notable warming trend in Arctic regions. However, due to limited observational data, the variation and causes of polar precipitation, especially large-scale precipitation events associated with Arctic cyclones, remain unclear. In this paper, GPM satellite data are compared with ERA5 reanalysis data to explore the characteristics of summer precipitation at the northern margin of the Eurasian region (NMER) and the influence of cyclone activity on precipitation. It is revealed that high precipitation values in the Arctic region, as indicated by the GPM and ERA5 data, are mainly concentrated at the NMER. However, the GPM data show an overall larger precipitation amount, while the station observations more closely agree with the ERA5 precipitation changes at the NMER. The cyclone identification results indicate that summer cyclones at the NMER are mainly distributed in the Barents, Kara and Laptev Seas, and the precipitation contribution rate of ERA5-derived cyclones is 37.35%, which is significantly higher than that of GPM-derived cyclones (29.47%). Furthermore, high cyclone activity results in more intense precipitation, with the top 5% of the strongest cyclones contributing 60% (GPM) and 40% (ERA5) to the total cyclonic precipitation.
近几十年来，随着全球变暖，全球大气水汽容量增加，北极地区的变暖趋势尤为显著。然而，由于观测数据有限，极地降水的变化及其成因，尤其是与北极气旋相关的大规模降水事件，仍不明确。本文将全球降水测量(GPM)卫星数据与欧洲中期天气预报中心(ERA5)再分析数据进行比较，以探讨欧亚地区北部边缘(NMER)夏季降水的特征以及气旋活动对降水的影响。结果表明，GPM和ERA5数据显示，北极地区的高降水值主要集中在NMER。然而，GPM数据显示的降水总量总体上更大，而站点观测结果与NMER地区ERA5的降水变化更为吻合。气旋识别结果表明，NMER地区夏季气旋主要分布在巴伦支海、喀拉海和拉普捷夫海，ERA5衍生气旋的降水贡献率为37.35%，显著高于GPM衍生气旋的降水贡献率(29.47%)。此外，气旋活动频繁会导致降水更为强烈，最强的5%气旋对气旋总降水量的贡献率分别为60%(GPM)和40%(ERA5)。
