欧洲环境卫星密切监视墨西哥湾浮油状况
文章来源:未知 文章作者:meng 发布时间:2010-05-06 01:28 字体: [ ]  进入论坛
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As fears grow that the Loop Current in the Gulf1 of Mexico could soon catch the oil slick(水面浮油) and drag it south towards coral reefs(珊瑚礁) in the Florida Keys, scientists are monitoring the situation closely with ESA's Envisat radar2 data. By combining surface roughness(表面粗糙度) and current flow information with Envisat Advanced Synthetic3 Aperture4 Radar (ASAR高级合成孔径雷达) data of the spill, SAR image analysts5 are able to detect the direction in which the spill boundaries can drift. In these two ASAR images for 29 April and 2 May, advanced processing methods have been performed to display ocean surface roughness variations and Doppler-derived6 ocean surface radial velocities7(径向速度) . Merging8 this information provides insight into the spatial9(空间的,立体的) structure of the spill and its dispersion(散布,驱散) by the upper ocean turbulent(骚乱的,狂暴的) flow.

In the 29 April image, smooth surfaces appear as black patches(黑斑点) inside the oil spill and in the very low wind region east of the spill, where the flow analysis is not possible.

As visible in both images, the spill still appears relatively10 confined around its point of origin and is still north of the Loop Current, a powerful conveyor belt that circulates clockwise(顺时针方向地) around the Gulf toward Florida before being joining the powerful Gulf Stream.

An intriguing11(迷人的,有趣的) shape is detected in the 2 May image that seems to follow passively the flow derived from the Doppler measurements.

The fear is that winds could push the oil slick south until it joins the Loop Current, which would carry the oil towards Florida. If that were to happen, the oil could flow into the Gulf Stream and be carried up to the US East Coast.

"As observed, this does not seem to be the case at the moment as no connection between the spill and the intense current presently occurs," said Dr Bertrand Chapron of IFREMER, the French Research Institute for Exploitation of the Sea. "Thanks to systematic12 Envisat ASAR planning over this area, close monitoring of the situation is ensured as long as there is some wind to contrast the surface roughness."

Dr Chapron and Dr Fabrice Collard of France's CLS (formerly the BOOST Technologies Company) created these products using ASAR in Wide Swath mode. They have been working with radar data for many years and have developed sets of algorithms(算法) that allow ASAR data to be processed in near-real time and to produce state-of-the-art ocean parameters13(参数,参量) . These are made widely available on the SOPRANO ocean products demonstration14 website developed with ESA.

"The upcoming Sentinel-1 SAR instrument will have an enhanced capability15 to capture the surface flow information on top of the higher resolution sea surface roughness," Dr Chapron explained. "As demonstrated, these combined products are very promising16 for strengthening the use of SAR data to help fight oil-spill consequences on coastal17 zones."

Sentinel-1 is a two-satellite system. The first Sentinel-1 satellite is planned for launch at the end 2012 and will ensure the continuity of SAR data. The second Sentinel-1 satellite is planned for launch in 2014. The fleet of Sentinel satellites is being developed by ESA within the EU's Global Monitoring for Environment and Security initiative.



点击收听单词发音收听单词发音  

1 gulf 1e0xp     
n.海湾;深渊,鸿沟;分歧,隔阂
参考例句:
  • The gulf between the two leaders cannot be bridged.两位领导人之间的鸿沟难以跨越。
  • There is a gulf between the two cities.这两座城市间有个海湾。
2 radar kTUxx     
n.雷达,无线电探测器
参考例句:
  • They are following the flight of an aircraft by radar.他们正在用雷达追踪一架飞机的飞行。
  • Enemy ships were detected on the radar.敌舰的影像已显现在雷达上。
3 synthetic zHtzY     
adj.合成的,人工的;综合的;n.人工制品
参考例句:
  • We felt the salesman's synthetic friendliness.我们感觉到那位销售员的虚情假意。
  • It's a synthetic diamond.这是人造钻石。
4 aperture IwFzW     
n.孔,隙,窄的缺口
参考例句:
  • The only light came through a narrow aperture.仅有的光亮来自一个小孔。
  • We saw light through a small aperture in the wall.我们透过墙上的小孔看到了亮光。
5 analysts 167ff30c5034ca70abe2d60a6e760448     
分析家,化验员( analyst的名词复数 )
参考例句:
  • City analysts forecast huge profits this year. 伦敦金融分析家预测今年的利润非常丰厚。
  • I was impressed by the high calibre of the researchers and analysts. 研究人员和分析人员的高素质给我留下了深刻印象。
6 derived 6cddb7353e699051a384686b6b3ff1e2     
vi.起源;由来;衍生;导出v.得到( derive的过去式和过去分词 );(从…中)得到获得;源于;(从…中)提取
参考例句:
  • Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
  • He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》
7 velocities 64d80206fdcbbf917808c5b00e0a8ff5     
n.速度( velocity的名词复数 );高速,快速
参考例句:
  • In experimenting we find out that sound travels with different velocities through different substances. 在实验中,我们发现声音以不同的速度通过不同的物质而传播。 来自《现代汉英综合大词典》
  • A gas in thermal equilibrium has particles of all velocities. 处于热平衡的气体,其粒子有一切速度。 来自辞典例句
8 merging 65cc30ed55db36c739ab349d7c58dfe8     
合并(分类)
参考例句:
  • Many companies continued to grow by merging with or buying competing firms. 许多公司通过合并或收买竞争对手的公司而不断扩大。 来自英汉非文学 - 政府文件
  • To sequence by repeated splitting and merging. 用反复分开和合并的方法进行的排序。
9 spatial gvcww     
adj.空间的,占据空间的
参考例句:
  • This part of brain judges the spatial relationship between objects.大脑的这部分判断物体间的空间关系。
  • They said that time is the feeling of spatial displacement.他们说时间是空间位移的感觉。
10 relatively bkqzS3     
adv.比较...地,相对地
参考例句:
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
11 intriguing vqyzM1     
adj.有趣的;迷人的v.搞阴谋诡计(intrigue的现在分词);激起…的好奇心
参考例句:
  • These discoveries raise intriguing questions. 这些发现带来了非常有趣的问题。
  • It all sounds very intriguing. 这些听起来都很有趣。 来自《简明英汉词典》
12 systematic SqMwo     
adj.有系统的,有计划的,有方法的
参考例句:
  • The way he works isn't very systematic.他的工作不是很有条理。
  • The teacher made a systematic work of teaching.这个教师进行系统的教学工作。
13 parameters 166e64f6c3677d0c513901242a3e702d     
因素,特征; 界限; (限定性的)因素( parameter的名词复数 ); 参量; 参项; 决定因素
参考例句:
  • We have to work within the parameters of time. 我们的工作受时间所限。
  • See parameters.cpp for a compilable example. This is part of the Spirit distribution. 可编译例子见parameters.cpp.这是Spirit分发包的组成部分。
14 demonstration 9waxo     
n.表明,示范,论证,示威
参考例句:
  • His new book is a demonstration of his patriotism.他写的新书是他的爱国精神的证明。
  • He gave a demonstration of the new technique then and there.他当场表演了这种新的操作方法。
15 capability JsGzZ     
n.能力;才能;(pl)可发展的能力或特性等
参考例句:
  • She has the capability to become a very fine actress.她有潜力成为杰出演员。
  • Organizing a whole department is beyond his capability.组织整个部门是他能力以外的事。
16 promising BkQzsk     
adj.有希望的,有前途的
参考例句:
  • The results of the experiments are very promising.实验的结果充满了希望。
  • We're trying to bring along one or two promising young swimmers.我们正设法培养出一两名有前途的年轻游泳选手。
17 coastal WWiyh     
adj.海岸的,沿海的,沿岸的
参考例句:
  • The ocean waves are slowly eating away the coastal rocks.大海的波浪慢慢地侵蚀着岸边的岩石。
  • This country will fortify the coastal areas.该国将加强沿海地区的防御。
TAG标签: oil current data slick
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