一个温带海洋气旋爆发性发展的动力学分析   总被引：3，自引：0，他引：3  

赵其庚  仪清菊  丁一汇 《海洋学报》1994,16(1):30-37

本文对1982年3月11～16日出现在西北太平洋地区的一个强温带海洋气旋的爆发性发展过程进行了诊断分析。重点讨论了斜压不稳定和非绝热加热过程在气旋发展不同阶段的特点和相互作用。分析揭示,在气旋发展初期低层与高层扰动在垂直方向是分离的,尺度和移速都不同。由高低层等熵位涡扰动的相对位相分析发现,在发展初期斜压不稳定条件对发展是不利的,而在爆发阶段则非常有利。由湿位涡和水汽辐合,等熵运动和非地转运动分析指出,非绝热加热过程在前边两个阶段都很重要。在爆发阶段斜压不稳定与非绝热加热过程相互作用,产生正反馈,使气旋得到爆发性发展。  相似文献   

夏季江淮暴雨过程对大尺度湿度场的敏感性试验   总被引：1，自引：0，他引：1       下载免费PDF全文

赵其庚  沈文海  袁开立 《应用气象学报》1995,6(3):320-326

用全球谱模式T42L11对1991年6月底至7月初江淮暴雨的中期过程作敏感性试验。结果表明，在初始场中，当印度洋～孟加拉湾高湿中心附近(100°E以西)的水汽减弱后，江淮雨量减少45%，且东亚夏季风环流减弱。若南海～西太平洋高湿中心附近(100°E以东)的水汽减弱时，则东亚夏季风环流反而加强，雨带移向华北。  相似文献   

FSU全球谱模式及其T21在国内机器上运转的初步结果     

赵其庚 《气象科技》1990,(3):21-26

美国佛罗里达州大学全球谱模式(FSUGSM),是主要用于低纬中期数值天气预报和数值模拟研究的全球多层原始方程模式。特点是对低纬大气的物理过程考虑得比较细致,例如在积云对流参数化、辐射与云的相互作用、行星边界层的处理和物理初值化等方面都有其特色。近几年来,在用来制作10天低纬中期数值预报、模拟季风爆发、季  相似文献   

侵入青藏高原冷空气过程的等熵位涡分析   总被引：10，自引：1，他引：10  

赵其庚 《气象》1990,16(6):9-14

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国际温室气体散发的减少—平等与效率研究     

Solo.  BD 贾绍风 《地理译报》1992,(4):48-53

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Using nitrate to quantify quick flow in a karst aquifer   总被引：3，自引：0，他引：3  

Mahler BJ  Garner BD 《Ground water》2009,47(3):350-360

In karst aquifers, contaminated recharge can degrade spring water quality, but quantifying the rapid recharge (quick flow) component of spring flow is challenging because of its temporal variability. Here, we investigate the use of nitrate in a two-endmember mixing model to quantify quick flow in Barton Springs, Austin, Texas. Historical nitrate data from recharging creeks and Barton Springs were evaluated to determine a representative nitrate concentration for the aquifer water endmember (1.5 mg/L) and the quick flow endmember (0.17 mg/L for nonstormflow conditions and 0.25 mg/L for stormflow conditions). Under nonstormflow conditions for 1990 to 2005, model results indicated that quick flow contributed from 0% to 55% of spring flow. The nitrate-based two-endmember model was applied to the response of Barton Springs to a storm and results compared to those produced using the same model with δ¹⁸O and specific conductance (SC) as tracers. Additionally, the mixing model was modified to allow endmember quick flow values to vary over time. Of the three tracers, nitrate appears to be the most advantageous because it is conservative and because the difference between the concentrations in the two endmembers is large relative to their variance. The δ¹⁸O-based model was very sensitive to variability within the quick flow endmember, and SC was not conservative over the timescale of the storm response. We conclude that a nitrate-based two-endmember mixing model might provide a useful approach for quantifying the temporally variable quick flow component of spring flow in some karst systems.  相似文献   

Comparative biomonitors of coastal trace metal contamination in tropical South America (N. Brazil)     

e Silva CA  Smith BD  Rainbow PS 《Marine environmental research》2006,61(4):439-455

Samples of 5 bivalve molluscs (Crassostrea rhizophorae, Mytella charruana, Anomalocardia brasiliana, Anadara ovalis, Phacoides pectinata), 2 barnacles (Fistulobalanus citerosum, Balanus amphitrite) and leaves of the mangrove tree Rhizophora mangle were collected from up to 11 sites in two estuaries in Natal, Brazil--the comparatively contaminated Potengi estuary and the comparatively uncontaminated Curimataú estuary. Specimens were analysed for the trace metals Zn, Cu, Cd, Fe, Mn and Ni, and a comparative assessment made of the power of the different species as trace metal biomonitors. Four of the 5 bivalves (not P. pectinata) take up metals from solution and suspended material (food source), while P. pectinata as a lucinid with symbiotic chemosynthetic bacteria takes up metals from dissolved sources only. The organisms with the strongest net accumulation of particular metals showed the greatest discrimination between trace metal bioavailabilities between sites. Barnacles (F. citerosum) showed the best discrimination, but oysters (C. rhizophorae) are particularly recommended as biomonitors given their strong accumulation patterns for many trace metals, their large size and their local abundance.  相似文献   

对密西西比州布鲁克亥文油田地下卤水的航空电磁法填图     

Smith  BD 崔霖沛 《物探化探译丛》1993,(A07):5-9

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几丁虫的反射率—早古生代有机岩石学的新前缘   总被引：2，自引：0，他引：2  

汪啸风埃特.  BD 《地学前缘》1997,4(3):139-145

根据对我国扬子地台中部奥陶纪几西虫生物地层及其壳壁光性特征和反射率的研究，联系华南及塔里木盆地有关的资料，系统总结了我国奥陶纪，志留纪几丁虫生物组合序列的划分及其对比，探讨了几丁虫的光性特性。指出了几丁虫在所切光面上具有各向同性的光性特征，只有反射率而无双反射率；在相同的成熟度情况下，几丁虫的随机油浸反射率较笔石高，而较虫牙和颖源类低。  相似文献   

热带太平洋海温年际变化对海表风应力的响应及其敏感性试验          下载免费PDF全文

赵其庚宋永加  彭淑英 《应用气象学报》1998,9(1):48-58

在GFDL海洋模式的基础上发展了一个高分辨率的太平洋环流模式,模式较好地模拟出太平洋上层海温的气候状态及其季节和年际变化的主要特征。用观测的1985～1995年海表风应力去强迫模式,清楚地模拟出相应的暖事件和冷事件。敏感性试验揭示,日界线附近持续的西风距平愈强,赤道中、东太平洋增暖愈大,其影响向东传播扩展,5个月左右可达太平洋东岸,传播速度与西风应力距平强度关系不大。  相似文献