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111.
112.
Roy W. Spencer 《GeoJournal》2007,70(1):11-14
Al Gore’s movie An Inconvenient Truth gives a variety of unusually biased interpretations of the state of climate science and global warming theory. These cover
a wide range of natural events and processes which could potentially be impacted by global warming, but which the movie misrepresents
as clear examples of the human influence on climate. A few examples include the mixing up of cause and effect in his graphical
portrayal of temperature and carbon dioxide variations over hundreds of thousands of years; the repeated depiction of ice
calving from glaciers as a sign of global warming; the implication that Hurricane Katrina was the fault of humans; and the
particularly extreme view that the Greenland ice sheet will melt, flooding coastal cities worldwide. Ultimately, all of these
are related to the widespread perception that scientists have uniquely tied global warming to anthropogenic greenhouse gas
emissions. The real inconvenient truth is that science has no idea how much of recent warming is natural versus the result
of human activities. 相似文献
113.
J. Manuel Lpez 《Atmospheric Research》2007,83(2-4):272-283
At approximately 6:10 UTC in the morning of 17th August 2003, a squall line developed over south Catalonia (the northeast region of Spain). During the next 9 h, the squall moved rapidly northeast and crossed Catalonia and the French regions of Languedoc–Roussillon and Province, damaging and uprooting hundreds of trees and blocking trains in the region. Wind gusts reached were recoded up to 52 m/s with evidence of F2 intensity damage. This case study shows the characteristics of a derecho (widespread convectively induced windstorm).Radar observations of the evolving squall line show signatures often correlated with damaging surface winds, including:
- a. Bow echoes,
- b. Rear inflow notches,
- c. Rear inflow jets,
- d. Medium altitude radial convergence,
- e. Narrow gradient of very marked reflectivity,
- f. Development of isolated cells ahead of the convective line,
- g. A band of convection off the northern end of the line known as a “warm advection wing”.
114.
Nikolai Dotzek Robert M. Rabin Lawrence D. Carey Donald R. MacGorman Tracy L. McCormick Nicholas W. Demetriades Martin J. Murphy Ronald L. Holle 《Atmospheric Research》2005,76(1-4):127
A multi-sensor study of the leading-line, trailing-stratiform (LLTS) mesoscale convective system (MCS) that developed over Texas in the afternoon of 7 April 2002 is presented. The analysis relies mainly on operationally available data sources such as GOES East satellite imagery, WSR-88D radar data and NLDN cloud-to-ground flash data. In addition, total lightning information in three dimensions from the LDAR II network in the Dallas–Ft. Worth region is used.GOES East satellite imagery revealed several ring-like cloud top structures with a diameter of about 100 km during MCS formation. The Throckmorton tornadic supercell, which had formed just ahead of the developing linear MCS, was characterized by a high CG+ percentage below a V-shaped cloud top overshoot north of the tornado swath. There were indications of the presence of a tilted electrical dipole in this storm. Also this supercell had low average CG− first stroke currents and flash multiplicities. Interestingly, especially the average CG+ flash multiplicity in the Throckmorton storm showed oscillations with an estimated period of about 15 min.Later on, in the mature LLTS MCS, the radar versus lightning activity comparison revealed two dominant discharge regions at the back of the convective leading edge and a gentle descent of the upper intracloud lightning region into the trailing stratiform region, apparently coupled to hydrometeor sedimentation. There was evidence for an inverted dipole in the stratiform region of the LLTS MCS, and CG+ flashes from the stratiform region had high first return stroke peak currents. 相似文献
115.
2005年8月21日桂西大暴雨天气分析与降水模拟 总被引:9,自引:2,他引:9
利用常规、红外云图、雷达资料对2005年8月21日发生在桂西的大暴雨天气过程进行诊断分析,发现造成桂西这次强降雨主要直接影响系统来自低层切变线、高空低槽和地面静止锋。低层切变线是引发此次强降水的主要系统。低层低涡是在桂西强降水发生后才逐渐发展起来的。采用非静力中尺度数值模式(MM5)对这次大暴雨过程进行初步模拟试验,结果表明模式对这次强降水的雨带分布、暴雨中心强度及其位置的模拟也与实况较为接近。 相似文献
116.
The Penglai 9-1 (PL9-1) oil field, which contains China's third largest offshore oil accumulation (in-place reserves greater than 2.28 × 108 ton or 1.49 × 109 bbl), was found in shallow reservoirs (700–1700 m, 2297–5577 ft) within the most active fault zone in east China. The PL9-1 field contains two oil-bearing series, the granite intrusions in Mesozoic (Mz) and both the sandstone reservoirs in Neogene Guantao (Ng) and Neogene Minghuazhen (Nm) Formation. The origins of the PL9-1 field, both in terms of source rock intervals and generative kitchens, were determined by analyzing biomarker distributions for 61 source rock samples and 33 oil samples. The Mesozoic granite intrusions, which hold more than 80% of the oil reserves in the field, were charged in the west by oil generated from the third member (Es3) of the Shahejie Formation in the Bodong depression. The Neogene reservoirs of the PL9-1 field were charged in the west by oil generated from the third member (Es3) of the Shahejie Formation in the Bodong depression and in the south by oil generated from the first member (Es1) of the Shahejie Formation in the Miaoxibei depression. Interactive contact between the large fan delta and the mature source rocks residing in the Es3 Formation of the Bodong depression resulted in a high expulsion efficiency from the source rocks and rapid oil accumulation in the PL9-1 field, which probably explains how can this large oil field accumulate and preserve within the largest and most active fault zone in east China. 相似文献
117.
一次强对流天气及其中短时强降水的成因分析 总被引:5,自引:3,他引:2
利用常规地面、高空观测资料,自动站资料,NCEP再分析资料,多普勒雷达资料和WRF模式模拟资料等,对2009年6月初晋豫鲁皖苏5省的一次强对流天气及其中短时强降水的形成原因进行了分析。结果表明:本次过程是在高空东北冷涡不断引导冷空气南下,与低层低涡扰动形成冷暖空气汇合的有利天气形势下发生的。边界层内的强烈辐合抬升是触发对流发生和释放对流不稳定能量的主要原因之一。高空有明显的干侵入并叠加在低层高假相当位温的暖湿空气之上,这种较强的位势不稳定形势对本次过程中对流系统的触发提供了有利的条件。对流系统移动方向一侧有较强的风暴相对螺旋度,通过低层辐合上升气流的倾斜作用,使更多的水平涡度转化为垂直涡度,为本次过程的发展、维持以及其短时强降水的发生提供了有利的条件。 相似文献
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