棒球

Antarctic ice sheet loss temporarily slows due to remote influence of tropical warm pool: Chinese, foreign scientists_我的网站

A |     

    Adelie penguins (Pygoscelis adeliae) on fast ice with tourists walking in the background, Bourgeois Fjord, Marguerite Bay, Antarctica. Photo: VCG
Joint research by Chinese and international scientists have found that the rate of long-term Antarctic mass loss has slowed, driven by sea surface temperature anomalies in the remote tropical warm pool, China Central Television (CCTV) reported on Thursday, citing a statement released by the Institute of Oceanology, Chinese Academy of Sciences (CAS). 
The Antarctic ice sheet is one of the major sources of uncertainty in global sea-level rise forecasts. From 2003 to 2024, the Antarctic ice sheet lost an average of approximately 140.5 billion tons each year, CCTV reported. 
However, Chinese and foreign scientists have found that the Antarctic ice sheet gained roughly 695 billion tons between July 2021 and April 2023, the largest 22-month mass gain seen in nearly two decades via satellite gravimetry, the Institute of Oceanology, CAS announced on Thursday.
The scientists found out that from 2021 to 2023, sustained heavy snowfall in East Antarctica led to significant increases in snow accumulation, partially offsetting the ongoing ice loss in West Antarctica. 
The scientists' research shows that this was caused by tropical ocean-driven atmospheric processes that altered moisture transport pathways and increased snowfall over Antarctica. 
The research was conducted by the research team at the Institute of Oceanology at CAS, along with peers from countries including the US, Hungary and Japan. It was published in the academic journal Nature on Wednesday. 
According to Wang Yunhe, first author of the research paper and an associate research fellow at the Institute of Oceanology, sea surface temperatures in the tropical western Pacific warm pool remained unusually warm from 2021 to 2023. As one of the regions with the highest sea surface temperatures and strongest heat release into the atmosphere worldwide, changes in this region can reshape atmospheric circulation. 
The persistently warmer-than-normal seawater triggered large-scale atmospheric waves. 
After reaching the high latitudes of the Southern Hemisphere, the waves reshaped wind patterns and moisture transport pathways. Moisture-tracking simulations show that water vapor from the mid-latitude Indian Ocean fueled heavy snowfall in East Antarctica, leading to a recovery in ice sheet mass. 
Observations and climate simulations suggest that such warming events occur roughly once a decade. But these temporary pauses are not enough to reverse Antarctica's long-term ice loss. The West Antarctic ice sheet continues to shrink, while parts of East Antarctica remain increasingly vulnerable to warmer ocean waters melting ice shelves from below and speeding the flow of glaciers into the sea.
The study shows how persistent warming in the tropical warm pool can contribute to the recovery of Antarctic ice-sheet mass, highlighting the role of East Antarctic atmospheric circulation in connecting tropical climate shifts with changes in the ice sheet. The findings point to a previously overlooked climate link between the tropical warm pool and East Antarctica, offering a new perspective on how distant climate systems may shape the continent's future.
Global Times
。          　　“下村检查水库，申请一辆公车。

B | ”8月19日午后刚上班，日照市五莲县于里镇农业综合服务中心工作人员王友礼快步走进镇党政办。     　　“老王，这次给你换辆新到的车。”镇党政办工作人员潘春鹏一边递出申请单，一边说道。     　　“镇里什么时候有‘新车’了?”王友礼有些惊喜。

C |      　　“我们刚申请到一辆专门保障下乡的应急用车，里程数不到10万公里。”潘春鹏转身从钥匙柜里取出车钥匙，“这车原本在省直机关闲置，前些日子调拨到县里，现在又分到咱们镇，补上了空缺的用车编制。”      　　五莲县地处山区，乡镇工作人员下村入户频繁。此前，于里镇共有5个公车编制，2辆车已达到报废状态，实际能正常使用的只有3辆。“这5辆车每年要花8万多元维修费，其中大部分费用集中在这2辆旧车上。”于里镇党委书记周华说，因为用车紧张，很多同事下村只能开私家车。

D |      　　镇上“资历最老”的这2辆车购于2010年前后，记者拉开驾驶位车门，刺耳的“吱呀”声传来，车身及内饰多处老化，掉皮掉漆，行驶里程也超过45万公里。      　　面对日益老化的车况和不断增长的用车需求，2021年以来，于里镇先后3次提交书面申请，协调解决车辆更新问题，但受限于县级财政压力和车辆编制的刚性约束，申请迟迟未能落地。     　　于里镇的现状，折射出基层公务用车长期存在的困境。放眼全省，基层公车大多服役年限偏长，运行里程普遍在40万公里以上;而地方财政紧张，难以大规模购置新车，车辆更新压力较大。

E |      　　如何实现过紧日子与保障基层出行的双赢?      　　自2017年起，山东逐步建立全省公务用车管理平台，对车辆行驶里程、位置信息等实现全程可视化监管，全面掌握机构改革、部门撤并、临时机构任务结束等情形下产生的车辆超编、闲置情况，将所有“富余”车辆纳入公物仓统一管理。     　　“今年，我们进一步整合全省闲置公务用车资产，构建‘实体仓+虚拟仓’结合的公务用车公物仓管理系统。”山东省机关事务管理局公务用车管理处处长史晓虎介绍，目前实体仓集中收储闲置、低效运转的公务用车40台;虚拟仓则依托信息化手段，将一定数量的车辆纳入线上统筹，在保持全省公务用车编制总数不增加的前提下，实现动态划拨、资源共享。     　　过去，公车资产受分级管理限制，省里的车辆难以顺畅调拨到市县。为此，省机关事务局与省财政厅联合打通资产划拨渠道，破除了车辆资产分级管理形成的壁垒。     　　在此基础上，山东选取济南市历下区、新泰市、莘县、五莲县、泗水县等5个县(市、区)作为试点，筛选20辆车从公物仓一次性下拨，推动低效运转车辆跨单位、跨区域、跨层级使用。     　　作为全省首批试点之一，五莲县在初步构建“上级统筹、县级归集、按需调剂、共享复用”的省市县三级一体化体系的基础上，进一步将保障链条延伸至乡镇，探索构建省市县乡四级联动机制。     　　经过申请，7月21日，五莲县接收省、市公物仓调拨的公务用车5辆，全部纳入县公务用车管理平台。随后，结合平台运行数据和乡镇实际需求，又将4辆车投放到于里镇等4处位置偏远、车辆老化、用车缺口突出的乡镇。     　　“这批车辆在一定程度上弥补了基层公车运力缺口，解决了公车老旧失修、安全隐患突出、下村入户不便等现实问题。”五莲县机关事务服务中心主任孙宏波说，下沉车辆重点保障乡村振兴、基层治理、应急值守、入户督查等工作。     　　孙宏波给记者算了两笔账：调拨来的车几乎不新增财政开支，相比购买新车，每辆车可减支10多万元，成本也远低于租用社会车辆;每更新一辆公车，维修成本至少下降40%，安全性能也大幅提升。     　　“我们将总结试点经验，完善省市县一体化公物仓体系，探索通过数字化手段提升公车调度效率，推动更多闲置公车资源向基层倾斜。”史晓虎说。

F |      　　(大众新闻记者 刘兵 盖颐帆 通讯员 吕纬航)。

Current article:http://j7f83h.tourunbiaodubaicubangninan.shop/dytf/zztcfh.html

Published on:22:20:24