棒球

Beijing likely to receive one-third of annual rainfall in 24 hrs amid Typhoon Dolphin_我的网站

一 |     “超级地球”是一类不同于我们太阳系中任何行星的行星。    

    Local militia personnel clear water and drain waterlogged roads in Hefei, East China's Anhui Province, on August 11, 2026. Photo: IC
Typhoon Dolphin stopped being numbered at 5 pm on Tuesday, however its impacts continue as it triggered strong winds and heavy rainfall in inland areas as far north as Beijing. The National Meteorological Center (NMC) issued an orange alert for heavy rain, along with blue alerts for severe convective weather. Some areas are expected to see rainfall of 250 to 300 millimeters, CCTV News reported on Tuesday.
The China Meteorological Administration maintained a Level II emergency response on Tuesday as Typhoon Dolphin, its remnants, and cold air were forecast to bring heavy rain to parts of eastern and northern China including Zhejiang, Jiangsu, Anhui, Hubei, Henan, Shandong, Shanxi, Hebei and Beijing over the next three days, CCTV reported. 
From Tuesday morning to Wednesday morning, parts of multiple regions including western Jiangsu, north-central Anhui, Henan, central and western Hubei, western and southern Hebei, Beijing, central and western Inner Mongolia, northwestern Heilongjiang, and southwestern Yunnan are expected to experience heavy to torrential rainfall. Some areas in central Henan could see extreme rainfall, with accumulated precipitation reaching 250 to 300 millimeters, according to CCTV. 
Beijing activated a Level II flood-control emergency response at 9 am on Tuesday, with authorities at all levels throughout the city mobilizing flood prevention measures, CCTV reported. Meanwhile, the Ministry of Natural Resources launched a Level IV geological disaster defense response for Beijing at 3 pm on Tuesday.
According to the Beijing Meteorological Service's forecast, from Tuesday evening through Thursday, most parts of Beijing will experience heavy rainfall, with accumulated precipitation expected to exceed 100 millimeters in six hours and 150 millimeters in 24 hours. 
In seven areas including Tongzhou, Daxing, Fangshan, Mentougou, the Beijing Economic-Technological Development Area, Huairou, and Fengtai, six-hour rainfall totals could exceed 150 millimeters, while 24-hour accumulations could surpass 200 millimeters, CCTV reported. 
Beijing receives an average of 528 millimeters of precipitation annually, with most of it typically concentrated between June and September. Therefore the rainfall in 24 hours since Tuesday evening would likely be equivalent to more than one-third of the city's annual rainfall.
Beijing's flood control authorities ordered personnel responsible for urban waterlogging hotspots to take their posts from noon on Tuesday, with drainage equipment and flood barriers pre-positioned.
The city's flood control authorities also ordered the evacuation of people in flood- and landslide-prone areas before 6 pm on Tuesday and required work at construction sites to be suspended and mountain campsites and related tourist attractions to be closed.
Starting Wednesday, Beijing will encourage flexible work arrangements and staggered commuting, while schools may suspend classes and offline training, as well as outdoor teaching activities. Outdoor sports events will be halted, traffic controls imposed in high-risk areas, and public transport adjusted according to weather conditions and safety needs, CCTV reported. 
As significant rainfall is expected to begin affecting western and southern parts of Shandong Province on Tuesday, Jinan city has taken precautionary measures in advance, with multiple large and medium-sized reservoirs carrying out controlled pre-releases to create additional flood-control capacity and prepare for rainfall brought by the typhoon, CCTV reported. 
In Henan Province, the provincial department of water resources and provincial meteorological service jointly issued a red alert for flash floods at 8 am. It is forecast that from 8 am Tuesday to 8 am Wednesday, some mountainous areas in multiple cities and counties are at relatively high risk of flash flood.
Typhoon Dolphin's impact is far from over despite the typhoon having made landfall twice in Zhejiang. Zhang Fanghua, chief forecaster at the NMC, said on Monday that Dolphin's extensive cloud system and abundant moisture reserves have prevented its residual circulation from dissipating quickly. Instead, the residual circulation is expected to continue moving northward and westward. Over the next week, it is forecast to bring widespread and prolonged heavy rainfall to East China, North China, the Huanghuai region and even Northeast China, with some areas potentially experiencing extreme rainfall, the Science and Technology Daily reported.
Ma Jun, director of the Institute of Public and Environmental Affairs, told the Global Times that as the typhoon moves northward, it could encounter cold air from the north, potentially bringing not only heavy rainfall but also severe convective weather. Such weather can trigger disasters such as flash floods and mudslides, cause urban flooding, and affect farmlands. 
。它们的质量比地球大，但不超过其质量的10倍。这意味着它们的质量比地球大，但又比海王星和天王星这样的冰冷气态巨行星轻。它们可以由气体、岩石或两者的组合组成。关键事实天文学家通常通过观察行星在经过其宿主恒星前时阻挡了多少光线来发现和研究系外行星，这种技术被称为“凌日法”。GJ 1252 b是一颗距离地球约65光年的系外行星，其半径是地球的1.18倍，于2020年被美国宇航局的凌日系外行星调查卫星（TESS）用这种方法发现。这项新研究中的天文学家在斯皮策太空望远镜退役前对这颗系外行星进行了观测，并能够近距离观察这颗行星和它的大气。利用斯皮策望远镜，研究小组检测到了次蚀。这发生在一颗行星经过一颗恒星后面时，行星的光线被阻挡。行星的光线来自于其自身的红外辐射（或热量），以及从恒星反射的光线。寻找宇宙中生命迹象的天文学家们关注系外行星的一些不同细节。这些细节中有许多是系外行星和地球之间的比较，因为地球仍然是我们已经确认存在生命的唯一行星。GJ 1252 b并不比地球大多少。然而，它的温度要高得多，因为它离它的恒星更近。此外，正如天文学家在这项研究中发现的那样，它缺乏很多大气层。天文学家和研究报告的共同作者、马克斯-普朗克天文研究所系外行星大气物理学部主任Laura Kreidberg说：“我们刚刚开始了解岩质行星能够保持其大气层的频率，以及在什么情况下。这一测量结果表明，对于最热的行星，厚厚的大气层通常不太可能存在。”为了确定这颗系外行星的大气层（如果有的话）可能是什么样的，天文学家测量了GJ 1252 b的红外辐射，因为它的光线在一次次的日食中被遮挡。这些观测结果揭示了这颗行星炙热的白天温度，估计高达2242华氏度（1228摄氏度）。事实上，GJ 1252 b是如此之热，以至于金、银和铜都会在这颗行星上融化。

二 | 这个系外行星的预期温度，与大气模型相比，表明它的表面压力可能低于10bar （作为参考，地球的表面压力约为1bar ）。虽然这颗行星的炙热温度将使大气层难以长期稳定，但这颗系外行星可能有一个密度像地球的大气层，一个密度比地球高10倍的大气层，甚至没有任何大气层。

三 | 鉴于其极端的温度和低的表面压力，这个团队的天文学家们预测，GJ 1252 b可能根本没有大气层。这是目前科学家对其大气层有如此清晰认识的最小的系外行星。GJ 1252b是一颗系外行星，它首先被TESS探测到，然后在2020年望远镜任务结束之前，用斯皮策望远镜进行了更彻底的调查。随着使用詹姆斯-韦伯太空望远镜（JWST）的进一步探索，研究人员可以对这颗行星的大气层进行更严格的限制，这是一种令人兴奋的可能性。“当时，斯皮策是已知宇宙中唯一能够进行此类测量的设施。现在，斯皮策已被关闭，但JWST就在那里，在这些波长下，它比斯皮策要敏感得多。

四 | 因此，我们用斯皮策做的困难的事情，现在我们可以开始用JWST轻松地完成，而且是对更多数量的岩质行星，”Crossfield说。

五 | “JWST的红外观测有可能揭示出像这样的热的岩石行星的表面特性。不同类型的岩石有不同的光谱特征，所以我们有可能了解到GJ 1252b是由什么类型的岩石构成的，”Kreidberg补充说。用JWST进一步研究GJ 1252 b对科学家来说是一种令人兴奋的可能性，因为确认这样一颗小而热的系外行星上有大气层是非常有趣的，因为探索像这样一颗完全没有大气层的行星的组成也是非常迷人的。由Crossfield领导的堪萨斯大学的一个小组领导了这项研究，发现了关于GJ 1252b大气层的奇怪的新细节。这项研究发表在《天体物理学杂志通讯》上。

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Published on:21:36:49