The Open Atmospheric Science Journal最新文献_第6页

Lunar Tides and the Long-Term Variation of the Peak Latitude Anomaly of the Summer Sub-Tropical High Pressure Ridge over Eastern Australia 月潮与东澳大利亚夏季副热带高压脊峰度异常的长期变化

The Open Atmospheric Science Journal Pub Date : 2012-03-02 DOI: 10.2174/1874282301206010049

I. Wilson

{"title":"Lunar Tides and the Long-Term Variation of the Peak Latitude Anomaly of the Summer Sub-Tropical High Pressure Ridge over Eastern Australia","authors":"I. Wilson","doi":"10.2174/1874282301206010049","DOIUrl":"https://doi.org/10.2174/1874282301206010049","url":null,"abstract":"This study looks for evidence of a correlation between long-term changes in the lunar tidal forces and the inter- annual to decadal variability of the peak latitude anomaly of the summer (DJF) subtropical high pressure ridge over Eastern Australia (LSA) between 1860 and 2010. A simple \"resonance\" model is proposed that assumes that if lunar tides play a role in influencing LSA, it is most likely one where the tidal forces act in \"resonance\" with the changes caused by the far more dominant solar-driven seasonal cycles. With this type of model, it is not so much in what years do the lunar tides reach their maximum strength, but whether or not there are peaks in the strength of the lunar tides that re-occur at the same time within the annual seasonal cycle. The \"resonance\" model predicts that if the seasonal peak lunar tides have a measurable effect upon LSA then there should be significant oscillatory signals in LSA that vary in-phase with the 9.31 year draconic spring tides, the 8.85 year perigean spring tides, and the 3.80 year peak spring tides. This study identifies significant peaks in the spectrum of LSA at 9.4 (+0.4/� 0.3) and 3.78 (± 0.06) tropical years. In addition, it shows that the 9.4 year signal is in-phase with the draconic spring tidal cycle, while the phase of the 3.8 year signal is retarded by one year compared to the 3.8 year peak spring tidal cycle. Thus, this paper supports the conclusion that long-term changes in the lunar tides, in combination with the more dominant solar-driven seasonal cycles, play an important role in determining the observed inter-annual to decadal variations of LSA.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121018189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Simulation and Comparison Between Mid-Holocene and Preindustrial Indian Summer Monsoon Circulation Using a Regional Climate Model 全新世中期与工业化前印度夏季风环流的区域气候模式模拟与比较

The Open Atmospheric Science Journal Pub Date : 2012-03-02 DOI: 10.2174/1874282301206010042

Stefan Polanski, A. Rinke, K. Dethloff, S. Lorenz, Yongbo Wang, U. Herzschuh

{"title":"Simulation and Comparison Between Mid-Holocene and Preindustrial Indian Summer Monsoon Circulation Using a Regional Climate Model","authors":"Stefan Polanski, A. Rinke, K. Dethloff, S. Lorenz, Yongbo Wang, U. Herzschuh","doi":"10.2174/1874282301206010042","DOIUrl":"https://doi.org/10.2174/1874282301206010042","url":null,"abstract":"The regional climate model HIRHAM has been applied over the Asian continent from 0oN to 50oN and 42oE to \u0000110oE to simulate the Indian monsoon circulation under past and present-day conditions. The model is driven at the lateral and lower boundaries by the atmospheric output fields of the global coupled Earth system model ECHAM5-JSBACH/MPIOM for 44-years-long time slices during the mid-Holocene and the preindustrial present-day climate.Simulations with a horizontal resolution of 50 km are carried out to analyze the regional monsoon patterns under different external solar forcing and climatic conditions. The focus is on the investigation of the HIRHAM simulated summer monsoon circulation and the comparison of the regional atmospheric circulation and precipitation patterns between the paleo- and the preindustrial climate. Due to mid-Holocene changes in the atmospheric circulation with a reduced and southward shifted monsoonal flow across Arabian Sea and Bay of Bengal, an increase of summer rainfall at the windward slopes of western and southern Himalayas as well as over southern India and decreased rainfall over central India appear which is in agreement with proxy-derived precipitation reconstructions. During the mid-Holocene as well as for the present-day climate the same driving mechanisms for the summer monsoon in extreme wet monsoon years related to regional SST anomalies in the Indian Ocean and convective processes can be verified. Positive (negative) SST anomalies in the northern Indian Ocean enhance (inhibit) the local convection associated with a deepening (weakening) of the low pressure and trigger wet (dry) rainfall anomalies.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126588597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Influence of Land Use Land Cover on Cyclone Track Prediction - A Study During Aila Cyclone 土地利用、土地覆盖对气旋路径预测的影响——以艾拉气旋为例

The Open Atmospheric Science Journal Pub Date : 2012-02-10 DOI: 10.2174/1874282301206010033

K. Badarinath, D. Mahalakshmi, S. B. Ratna

引用次数: 9

Relations Between Bulk Precipitation, PM10 Composition andMeteorological Conditions in the Metropolitan Area of Costa Rica 哥斯达黎加大都市区降水、PM10组成与气象条件的关系

The Open Atmospheric Science Journal Pub Date : 2012-02-06 DOI: 10.2174/1874282301206010019

J. Murillo, S. Rodríguez, J. Rojas, A. Báez

引用次数: 2

The Coastal Boundary Layer and Air Pollution - A High Temporal Resolution Analysis in the East Mediterranean Coast 沿海边界层与空气污染——地中海东部海岸的高时间分辨率分析

The Open Atmospheric Science Journal Pub Date : 2012-01-19 DOI: 10.2174/1874282301206010009

L. Uzan, P. Alpert

引用次数: 17

Propagation of Convective Complexes Observed by TRMM in the Eastern Tropical Atlantic 热带大西洋东部TRMM观测到的对流复合体的传播

The Open Atmospheric Science Journal Pub Date : 2012-01-13 DOI: 10.2174/1874282301206010001

L. Druyan, M. Fulakeza

{"title":"Propagation of Convective Complexes Observed by TRMM in the Eastern Tropical Atlantic","authors":"L. Druyan, M. Fulakeza","doi":"10.2174/1874282301206010001","DOIUrl":"https://doi.org/10.2174/1874282301206010001","url":null,"abstract":"Precipitation maxima during the West African summer monsoon propagate generally westward in tandem with African easterly waves. A heretofore unreported, repeating pattern of northward drift of precipitation maxima is detected on Tropical Rainfall Measurement Mission (TRMM satellite) time-latitude distributions of daily accumulations over the eastern tropical Atlantic. Corresponding 3-hourly TRMM accumulations show that the northward drifting envelopes of precipitation during August 2006 are often comprised of individual swaths propagating towards the southwest, presumably as mesoscale squall lines. The implied northward drift on the time-latitude distribution is a component of a resultant northwestward movement. The study examines the entire available record of TRMM precipitation observations, 1998-2010, to summarize TRMM maxima propagation over the eastern tropical Atlantic. Meridional displacements of precipitation maxima are most prevalent in June-September 2006, occurring less frequently during other summers. An investigation of geopotential and circulation fields, limited to two case studies, suggests mechanisms to explain some of the observed propagation of TRMM maxima. In one event, northward drift of the precipitation envelope is consistent with the corresponding displacement of the intertropical convergence zone trough, although the southwest propagation of individual mesoscale convection maxima does not correspond to any synoptic feature on reanalysis circulation or reanalysis downscaled by a regional model. One speculation is that southwestward propagation of precipitation maxima could be caused by regeneration of convection at outflow boundaries of mature thunderstorms.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116699995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Theoretical analyses of aerosol aging on a substrate without wall-effects by a cross-flow 无壁面效应基材上气溶胶横流老化的理论分析

The Open Atmospheric Science Journal Pub Date : 2011-12-14 DOI: 10.2174/1874282301105010106

J. Cowin, Xin Yang, Xiao‐Ying Yu, M. Iedema

引用次数: 1

Regional Climate Model Simulations of the 1998 Summer China Flood: Dependence on Initial and Lateral Boundary Conditions 1998年中国夏季洪水的区域气候模式模拟:对初始和侧向边界条件的依赖

The Open Atmospheric Science Journal Pub Date : 2011-10-25 DOI: 10.2174/1874282301105010096

Shuyan Liu, Xin‐Zhong Liang, Wei Gao, Yuxiang He, Tiejun Ling

{"title":"Regional Climate Model Simulations of the 1998 Summer China Flood: Dependence on Initial and Lateral Boundary Conditions","authors":"Shuyan Liu, Xin‐Zhong Liang, Wei Gao, Yuxiang He, Tiejun Ling","doi":"10.2174/1874282301105010096","DOIUrl":"https://doi.org/10.2174/1874282301105010096","url":null,"abstract":"The dependence of the RegCM3 (Regional Climate Model version 3) downscaling skill on initial conditions (ICs) and lateral boundary conditions (LBCs) are investigated for the 1998 summer flood along the Yangtze River Basin in China. The effect of IC uncertainties is depicted by 15 realizations starting on each consecutive day from April 1 to 15 while all ending on September 1, 1998 with identical driving LBCs, analyses are based on June, July and August simulations. The result reveals certain IC effect on precipitation for daily evolution but little for summer mean geographical distribution. In contrast, the effect of LBCs uncertainties as represented by four different reanalyses are notably larger in both daily evolution and summer mean distribution. The ensemble average among either 15 IC realizations or 4 LBC runs does not show important skill improvement over the individuals. None of the RegCM3 simulations (including the ensemble means) captured the observed main rain band along the Yangtze River Basin. This general failure suggests the need for further model physics improvement.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130478587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The Importance of the Zagros Mountains Barrier Jet to Future Precipitation in the Fertile Crescent 扎格罗斯山屏障喷流对新月沃地未来降水的重要性

The Open Atmospheric Science Journal Pub Date : 2011-08-27 DOI: 10.2174/1874282301105010087

J. Evans, A. Alsamawi

{"title":"The Importance of the Zagros Mountains Barrier Jet to Future Precipitation in the Fertile Crescent","authors":"J. Evans, A. Alsamawi","doi":"10.2174/1874282301105010087","DOIUrl":"https://doi.org/10.2174/1874282301105010087","url":null,"abstract":"This study quantifies the significance of southerly water vapour fluxes, associated with the Zagros Mountains barrier jet, on precipitation occurring in the Eastern Fertile Crescent region and its change due to global warming. Precipitation events are simulated using a Regional Climate Model (MM5-Noah) driven by boundary conditions from a CCSM global climate model simulation with the SRES A2 emission scenario. The precipitation events were grouped into classes based on the similarity of their water vapour fluxes. Results show a massive increase in the southerly dominated classes which are associated with the formation of a barrier jet on the western slopes of the Zagros Mountains. This increase was related to an increase in atmospheric water vapour in the southern portion of the domain rather than to an increase in the frequency of formation or wind speed of the barrier jet itself. The presence of this barrier jet becomes increasingly important to precipitation in the Eastern Fertile Crescent region as global warming progresses. Thus, low resolution models that are unable to capture this phenomena will produce questionable future projections for this region.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117089724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Climate Change Attribution Using Empirical Decomposition of Climatic Data 基于气候数据经验分解的气候变化归因

The Open Atmospheric Science Journal Pub Date : 2011-07-20 DOI: 10.2174/1874282301105010074

C. Loehle, N. Scafetta

{"title":"Climate Change Attribution Using Empirical Decomposition of Climatic Data","authors":"C. Loehle, N. Scafetta","doi":"10.2174/1874282301105010074","DOIUrl":"https://doi.org/10.2174/1874282301105010074","url":null,"abstract":"The climate change attribution problem is addressed using empirical decomposition. Cycles in solar motion and activity of 60 and 20 years were used to develop an empirical model of Earth temperature variations. The model was fit to the Hadley global temperature data up to 1950 (time period before anthropogenic emissions became the dominant forcing mechanism), and then extrapolated from 1951 to 2009. After subtraction of the model, the residuals showed an approximate linear upward trend after 1942. Herein we assume that the residual upward warming observed during the second half of the 20th century has been mostly induced by a worldwide rapid increase of anthropogenic emissions, urbanization and land use change. The warming observed before 1942 is relatively small and it is assumed to have been mostly naturally induced by a climatic recovery since the Little Ice Age of the 17th century and the Dalton Minimum at the beginning of the 19th century. The resulting full natural plus anthropogenic model fits the entire 160 year record very well. Residual analysis does not provide any evidence for a substantial cooling effect due to sulfate aerosols from 1940 to 1970. The cooling observed during that period may be due to a natural 60-year cycle, which is visible in the global temperature since 1850 and has been observed also in numerous multisecular climatic records. New solar activity proxy models are developed that suggest a mechanism for both the 60-year climate cycle and a portion of the long-term warming trend. Our results suggest that because current models underestimate the strength of natural multidecadal cycles in the temperature records, the anthropogenic contribution to climate change since 1970 should be around half of that previously claimed by the IPCC [2007]. A 21st Century forecast suggests that climate may warm less than 1^{circ}C by 2100.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124545714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 59