• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Polar methane accumulation and rainstorms on Titan from simulations of the methane cycle
【24h】

Polar methane accumulation and rainstorms on Titan from simulations of the methane cycle

机译：模拟甲烷循环，泰坦上的极地甲烷积聚和暴雨

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Titan has a methane cycle akin to Earth's water cycle. It has lakes in polar regions1'2, preferentially in the north3; dry low latitudes with fluvial features4'5 and occasional rainstorms6'7; and tropospheric clouds mainly (so far) in southern middle latitudes and polar regions8""15. Previous models have explained the low-latitude dry-ness as a result of atmospheric methane transport into middle and high latitudes16. Hitherto, no model has explained why lakes are found only in polar regions and preferentially in the north; how low-latitude rainstorms arise; or why clouds cluster in southern middle and high latitudes. Here we report simulations with a three-dimensional atmospheric model coupled to a dynamic surface reservoir of methane. We find that methane is cold-trapped and accumulates in polar regions, preferentially in the north because the northern summer, at aphelion, is longer and has greater net precipitation than the southern summer. The net precipitation in polar regions is balanced in the annual mean by slow along-surface methane transport towards mid-latitudes, and subsequent evaporation. In low latitudes, rare but intense storms occur around the equinoxes, producing enough precipitation to carve surface features. Tropospheric clouds form primarily in middle and high latitudes of the summer hemisphere, which until recently has been the southern hemisphere. We predict that in the northern polar region, prominent clouds will form within about two (Earth) years and lake levels will rise over the next fifteen years.
机译：土卫六具有类似于地球水循环的甲烷循环。它在极地地区1'2中有湖泊，最好在北部3中。干燥低纬带河流特征4'5，偶有暴雨6'7；和对流层云主要（到目前为止）在南部中纬度和极地8“” 15。先前的模型已经解释了由于大气甲烷向中高纬度地区输送而导致的低纬度干燥度[16]。迄今为止，还没有模型可以解释为什么仅在极地地区，最好是在北部地区发现湖泊。低纬度暴雨如何产生；还是为什么云团聚集在中南部高纬度地区在这里，我们报告了一个三维大气模型的模拟，该模型与甲烷的动态地表储层耦合。我们发现甲烷被冷阱捕集并聚集在极地地区，特别是在北部，这是因为北部夏季的顶峰比南部夏季更长且净降水量更大。极地地区的净降水量在年平均值中是通过沿甲烷向中高纬度的缓慢运移以及随后的蒸发来平衡的。在低纬度地区，春分点附近会发生罕见但强烈的风暴，产生足够的降水来雕刻地表特征。对流层云主要形成于夏季半球的中高纬度地区，直到最近一直是南半球。我们预测，在北极地区，大约两（地球）年内将形成显着的云层，并且在接下来的十五年内湖水位将上升。

著录项

  • 来源
    《Nature》 |2012年第7379期|p.58-61|共4页
  • 作者

    T. Schneider; S. D. B. Graves; E. L. Schaller; M. E. Brown;

  • 作者单位

    California Institute of Technology, Pasadena, California 91125, USA;

    California Institute of Technology, Pasadena, California 91125, USA;

    NASA Dryden Aircraft Operations Facility, National Suborbital Education and Research Center, Palmdale, California 93550, US;

    California Institute of Technology, Pasadena, California 91125, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号